JPWO2017002701A1 - Liquid crystal composition and liquid crystal display device using the same - Google Patents

Abstract

[Summary] [Problem] The problems to be solved by the present invention include dielectric anisotropy, viscosity, nematic phase upper limit temperature, nematic phase stability at low temperature, various characteristics as a liquid crystal display device such as γ1, and display device Provided is a liquid crystal display element using a liquid crystal composition having a positive dielectric anisotropy that can realize excellent display characteristics when used in a liquid crystal display element without deteriorating the image sticking characteristic. "Solution" At least one from the group of compounds represented by general formula (i) as the first component and at least one from the group of compounds represented by general formula (ii) and general formula (iii) as the second component A liquid crystal composition comprising: No "selection figure"

Description

  The present invention relates to a composition having a positive dielectric anisotropy (Δε) useful as a liquid crystal display material and a liquid crystal display device using the same.

  Liquid crystal display elements are used in various measuring instruments, automobile panels, word processors, electronic notebooks, printers, computers, televisions, watches, advertisement display boards, etc., including watches and calculators. Typical liquid crystal display elements include TN (twisted nematic) type, STN (super twisted nematic) type, vertical alignment type using TFT (thin film transistor), and IPS (in-plane switching) type. Etc. The liquid crystal composition used in these liquid crystal display elements is stable against external stimuli such as moisture, air, heat, light, etc., and exhibits a liquid crystal phase in the widest possible temperature range centering on room temperature. And a low driving voltage is required. Furthermore, the liquid crystal composition is composed of several to tens of kinds of compounds in order to optimize the dielectric anisotropy (Δε) or the refractive index anisotropy (Δn) for each display element. Has been.

  In a vertical alignment (VA) type display, a liquid crystal composition having a negative Δε is used. In a horizontal alignment type display such as a TN type, STN type, or IPS (in-plane switching) type, a liquid crystal composition having a positive Δε is used. Is used. In addition, a driving method has been reported in which a liquid crystal composition having a positive Δε is vertically aligned when no voltage is applied and a horizontal electric field is applied to display the liquid crystal composition, and the necessity of a liquid crystal composition having a positive Δε is further increased. Yes. On the other hand, low voltage driving, high-speed response, and a wide operating temperature range are required in all driving systems. That is, Δε is positive, the absolute value is large, the viscosity (η) is small, and a high nematic phase-isotropic liquid phase transition temperature (Tni) is required. Further, from the setting of Δn × d, which is the product of Δn and the cell gap (d), it is necessary to adjust Δn of the liquid crystal composition to an appropriate range according to the cell gap. In addition, when applying a liquid crystal display element to a television or the like, since high-speed response is important, a liquid crystal composition having a low rotational viscosity (γ1) is required.

  Examples of the structure of the liquid crystal composition aimed at high-speed response include, for example, a compound represented by the formula (A-1) or (A-2) in which Δε is a positive liquid crystal compound, and a liquid crystal compound in which Δε is neutral. A liquid crystal composition using a combination of (B) is disclosed (Patent Documents 1 to 4).

  On the other hand, the use of liquid crystal display elements has been expanded, and there has been a significant change in the method of use and manufacturing method. In order to cope with these changes, it has become necessary to optimize characteristics other than the basic physical property values as conventionally known. That is, liquid crystal display elements using a liquid crystal composition are widely used, such as VA type and IPS type, and super large size display elements having a size of 50 type or more are practically used. Became. With the increase in substrate size, the method of injecting a liquid crystal composition into the substrate has become the mainstream of the injection method from the conventional vacuum injection method to the drop injection (ODF: One Drop Fill) method. The problem that the drop marks when dropped causes the display quality to deteriorate is brought to the surface.

  Furthermore, in the liquid crystal display element manufacturing process by the ODF method, it is necessary to drop an optimal liquid crystal injection amount according to the size of the liquid crystal display element. When the deviation of the injection amount increases from the optimum value, the balance between the refractive index and the driving electric field of the liquid crystal display element designed in advance is lost, and display defects such as spots and contrast defects occur. In particular, small liquid crystal display elements that are frequently used in smartphones that have become popular recently are difficult to control the deviation from the optimum value within a certain range because the optimum liquid crystal injection amount is small. Therefore, in order to keep the yield of the liquid crystal display element high, for example, there is little influence on the sudden pressure change and impact in the dropping device that occurs when dropping the liquid crystal, and the ability to keep dropping the liquid crystal stably for a long time Is also necessary.

  Thus, in the liquid crystal composition used for the active matrix drive liquid crystal display element driven by a TFT element or the like, while maintaining the characteristics and performance required for a liquid crystal display element such as high-speed response performance, In addition to the characteristics of having a high specific resistance value or high voltage holding ratio, which are emphasized, and being stable against external stimuli such as light and heat, development in consideration of the manufacturing method of liquid crystal display elements has been required. ing.

JP 2008-037918 A JP 2008-038018 A JP 2011-052120 A

In the liquid crystal compounds (B) having a neutral Δε used in the liquid crystal compositions described in the examples of Patent Documents 1 to 3, at least one end group (R ¹ or R ² ) has an alkyl group. A liquid crystal composition having a certain level of low viscosity can be prepared, but it has not been able to provide a low-viscosity liquid crystal composition corresponding to the high-speed response trend required for liquid crystal displays. is the current situation.

  In addition, the reliability characteristics of liquid crystal compositions as important as high-speed response are required to be stable against external stimuli such as light and heat, and the liquid crystal state is stably maintained over a long period of time. One of the indicators is low temperature stability. In order to ensure the above high-speed response, when a liquid crystal composition contains a large amount of a neutral liquid crystal compound having a relatively low molecular weight, Δε decreases. When Δε represented by formulas (A-1) and (A-2) such as 3 is combined with a positive liquid crystal compound, the temperature range and low-temperature stability of the liquid crystal phase are impaired. Therefore, there is a demand for a liquid crystal composition excellent in the temperature range of the liquid crystal phase and the low temperature stability while maintaining high-speed response and Δε.

  In order to solve these problems, the combination of a neutral liquid crystal compound having alkenyl groups at both ends and a positive liquid crystal compound having a specific structure significantly improves the low temperature stability and the temperature range of the liquid crystal phase. And it was confirmed that a low-viscosity liquid crystal composition can be provided.

  The problem to be solved by the present invention is a liquid crystal composition having a positive Δε, a liquid crystal phase having a wide temperature range, low viscosity, and good solubility at low temperatures. Is to provide. Furthermore, another problem to be solved by the present invention is to provide a liquid crystal composition having a liquid crystal phase in a wide temperature range, high specific resistance and voltage holding ratio, and stable to heat and light, By using this, an IPS or FFS type or TN type liquid crystal display element which has excellent transmittance and display quality and hardly causes display defects such as burn-in and dripping marks is provided with a high yield.

  Another problem to be solved by the present invention is to provide a liquid crystal composition that improves the elastic constant K value related to high-speed response.

  The present inventors have studied various liquid crystal compounds and various chemical substances, and found that the above problems can be solved by combining specific liquid crystal compounds, and have completed the present invention.

  Liquid crystal composition containing a compound represented by general formula (i) and one or more selected from the group of compounds represented by general formula (ii) and general formula (iii), and the liquid crystal composition A liquid crystal display device using the liquid crystal and a liquid crystal display device using the liquid crystal composition are provided.

  The liquid crystal composition having positive dielectric anisotropy of the present invention can obtain a significantly low viscosity, has good solubility at low temperatures, and changes in specific resistance and voltage holding ratio due to heat and light. Very small.

  The liquid crystal composition having positive dielectric anisotropy of the present invention is represented by the compound represented by the general formula (i), the general formula (ii), and the general formula (iii) contained in the liquid crystal composition. In combination with at least one or two or more compounds selected from the group of compounds, a significantly low viscosity and a high elastic constant Kavg can be obtained, and the solubility at low temperatures is good.

  The liquid crystal composition of the present invention exhibits a synergistic effect that has a lower viscosity and significantly improves low-temperature stability than a liquid crystal composition containing a compound having an alkenyl group on one side.

  The liquid crystal composition having positive dielectric anisotropy of the present invention can obtain a significantly low viscosity, has good solubility at low temperatures, and changes in specific resistance and voltage holding ratio due to heat and light. Since it is extremely small, the practicality of the product is high, and an IPS type or FFS type liquid crystal display element using the product can achieve a high-speed response.

  Since the present invention can exhibit performance stably in the liquid crystal display element manufacturing process, display defects due to the process can be suppressed and manufacturing can be performed with a high yield, which is very useful.

  The liquid crystal composition of the present invention preferably exhibits a liquid crystal phase at room temperature (25 ° C.), and more preferably exhibits a nematic phase. The liquid crystal composition of the present invention contains a dielectrically nearly neutral compound (Δε value is −2 to 2) and a positive compound (Δε value is larger than 2). The dielectric anisotropy of the compound is a value extrapolated from the measured value of the dielectric anisotropy of a liquid crystal composition prepared by adding to a liquid crystal composition that is almost dielectrically neutral at 25 ° C. In addition, although content is described in% below, this means weight%.

  The first of the present invention is the general formula (i):

(In the general formula (i), R ^ia and R ^ib are each independently an alkenyl group having 2 to 8 carbon atoms,
A ⁱ¹ and B ⁱ¹ are the following groups (a) and (b):
(A) 1,4-cyclohexylene group (one —CH ₂ — present in this group or two or more non-adjacent —CH ₂ — may be replaced by —O—).
(B) 1,4-phenylene group (one -CH = present in this group or two or more non-adjacent -CH = may be replaced by -N =).
Each of the above groups (b) may be independently substituted with a cyano group, a fluorine atom or a chlorine atom,
m ⁱ¹ is an integer of 0 to 3. ) One or more compounds represented by
General formula (ii):

(In the general formula (ii), R ⁱⁱ¹ represents an alkyl group having 1 to 8 carbon atoms or an alkenyl group having 2 to 10 carbon atoms, and one of the groups or two or more non-adjacent —CH Each ₂ -may be independently substituted by -C≡C-, -O-, -CO-, -COO- or -OCO-, and may be one or two or more non-adjacent groups in the group. Each hydrogen atom may be independently substituted with a fluorine atom,
K ⁱⁱ⁰ , K ⁱⁱ¹ and K ⁱⁱ² are each independently the following groups (a) and (b):
(A) 1,4-cyclohexylene group (one —CH ₂ — present in this group or two or more non-adjacent —CH ₂ — may be replaced by —O— or S—). .)
(B) 1,4-phenylene group (one -CH = present in this group or two or more non-adjacent -CH = may be replaced by -N =).
Each of the above groups (b) may be independently substituted with a cyano group, a fluorine atom or a chlorine atom,
Z ⁱⁱ¹ , Z ⁱⁱ² and Z ⁱⁱ³ are each independently a single bond, —CH ₂ CH ₂ —, — (CH ₂ ) ₄ —, —OCH ₂ —, —CH ₂ O—, —OCF ₂ —, —CF ₂ O—, —CH ₂ CH ₂ CF ₂ O—, ^—COO— , ^—OCO— or C≡C—, and when n ^ik is 0, one of Z ⁱⁱ¹ and Z ⁱⁱ² is -OCH ₂ - or _-CH 2 O-a ^represents, if ^{n IIK} is 1 or ^more, any one of Z ^{ii1, Z ii2} and ^{Z ii3} are, _{-OCH 2} - or _-CH 2 O-a represents ,
n ^iik independently represents 0, 1, 2, 3 or 4, and when n ^iiik is 2 or more, K ⁱⁱ² may be the same or different, and when n ^iiik is 2 or more, Z ⁱⁱ³ May be the same or different,
X ⁱⁱ¹ , X ⁱⁱ² , X ⁱⁱ³ and X ⁱⁱ⁴ each independently represent a hydrogen atom or a fluorine atom,
Y ⁱⁱ¹ each independently represents a compound represented by a fluorine atom, a cyano group, a trifluoromethyl group, a fluoromethoxy group, a difluoromethoxy group, a trifluoromethoxy group, or a 2,2,2-trifluoroethyl group, and a general formula (Iii):

(In the general formula (iii), R ⁱⁱⁱ¹ represents an alkyl group having 1 to 8 carbon atoms, and one or two or more non-adjacent —CH ₂ — in the alkyl group are each independently —CH _2. ═CH—, —C≡C—, —O—, —CO—, —COO— or OCO— may be substituted,
n ⁱⁱⁱ¹ represents 0, 1, 2, 3 or 4;
A ⁱⁱⁱ¹ and A ⁱⁱⁱ² are each independently
(A) 1,4-cyclohexylene group (the one present in the group -CH ₂ - or 2 nonadjacent or more -CH ₂ - may be replaced by -O- or S- .) And (b) 1,4-phenylene group (one —CH═ present in this group or two or more —CH═ not adjacent to each other may be replaced by —N═).
Each of the groups (a) and (b) may be independently substituted with a cyano group, a fluorine atom or a chlorine atom,
Z ⁱⁱⁱ¹ and Z ⁱⁱⁱ² are each independently a single bond, —CH ₂ CH ₂ —, — (CH ₂ ) ₄ —, —OCH ₂ —, —CH ₂ O—, —OCF ₂ —, —CF ₂ O—. , -COO-, -OCO- or C≡C-
when n ⁱⁱⁱ¹ is 2, 3 or 4 and a plurality of A ⁱⁱⁱ² are present, they may be the same or different; n ⁱⁱⁱ¹ is 2, 3 or 4 and a plurality of Z ⁱⁱⁱ¹ is present If they are the same or different,
X ⁱⁱⁱ³ and X ⁱⁱⁱ⁴ each independently represent a hydrogen atom, a chlorine atom or a fluorine atom,
Y ⁱⁱⁱ² represents a hydrogen atom, a fluorine atom, a chlorine atom, a cyano group, a trifluoromethyl group, a fluoromethoxy group, a difluoromethoxy group, a trifluoromethoxy group, or a 2,2,2-trifluoroethyl group. Is a liquid crystal composition containing at least one or two or more selected from the group consisting of compounds represented by:

  The liquid crystal composition according to the present invention includes a compound represented by the general formula (i) and a compound represented by the general formula (ii) or the general formula (iii). Compared with a liquid crystal composition containing only a group compound, the viscosity is lower and the low-temperature stability is significantly improved. More specifically, as compared with a liquid crystal composition in which a plurality of compounds having one alkenyl group on one side are mixed, the present invention has low viscosity and excellent low-temperature stability, and can improve the elastic constant (particularly K33).

  The liquid crystal composition of the present invention has a refractive index anisotropy (Δn) at 25 ° C. of 0.06 to 0.20, more preferably 0.07 to 0.18, and 0.08 to 0.16. Particularly preferred. More specifically, when it corresponds to a thin cell gap, it is preferably 0.11 to 0.14, and when it corresponds to a thick cell gap, it is preferably 0.08 to 0.11.

  The liquid crystal composition of the present invention preferably has a dielectric anisotropy (Δε) at 25 ° C. of +1 to +15, more preferably +1.5 to +12, and further preferably +2 to +10.

The liquid crystal composition of the present invention has a nematic phase-isotropic liquid phase transition temperature (T _ni ) of 60 ° C to 120 ° C, more preferably 70 ° C to 110 ° C, and particularly preferably 70 ° C to 100 ° C.

  The liquid crystal composition of the present invention has a viscosity (η) at 25 ° C. of 5 to mPa · s, more preferably 18 mPa · s or less, and particularly preferably 15 mPa · s or less.

The liquid crystal composition of the present invention has a rotational viscosity (γ ₁ ) at 25 ° C. of 20 to 120 mPa · s, more preferably 100 mPa · s or less, still more preferably 80 mPa · s or less, It is particularly preferably 60 mPa · s or less.

  Kaverage (also referred to as Kavg) according to the present invention is preferably 10 pN or more, more preferably 10 to 20, more preferably 10 to 19, and more preferably 11 to 18. Is more preferable, it is still more preferable that it is the range of 11-17, and it is especially preferable that it is the range of 12-16. K11, K22, and K33 can be obtained from the applied voltage-capacitance curve characteristics of the cell in which the liquid crystal is sealed, and the Coverage can be calculated as an average value thereof.

  Hereinafter, the compounds represented by formulas (i), (ii) and (iii), which are essential components of the liquid crystal composition according to the present invention, will be described in detail, and then suitable for use in the liquid crystal composition of the present invention. The liquid crystal compound will be described.

  The compound represented by the general formula (i) according to the present invention is preferably a dielectrically neutral compound (the value of Δε is −2 to 2).

In general formula (i), R ^ia and R ^ib are each independently an alkenyl group having 2 to 8 carbon atoms, preferably linear or branched, and more preferably linear. A linear alkenyl group having 2 to 6 carbon atoms is more preferable, and a linear alkenyl group having 2 to 3 carbon atoms is particularly preferable.

  A more preferable alkenyl group according to the present invention is preferably selected from groups represented by any one of the formulas (R1) to (R5). (The black dots in each formula represent carbon atoms in the ring structure.)

It is represented by In the present specification, examples of the alkenyl group are common and are appropriately selected from the above examples depending on the number of carbon atoms of each alkyl group.

In formula (i) according to the present invention, R ^ia and R ^ib are each independently preferably formula (R1), formula (R2), or formula (R4), more preferably formula (R1), or formula (R2). .

  Moreover, since the compound represented by the general formula (i) according to the present invention has an alkenyl group on both groups, the liquid crystal composition is a mixture of two or more compounds having an aralkenyl group on one side. Synergy is shown in the effect of the decrease in viscosity and the improvement of the elastic constant K33.

In general formula (i), A ⁱ¹ and B ⁱ¹ are preferably each independently a group selected from the group consisting of a 1,4-cyclohexylene group and a 1,4-phenylene group, and these groups are each independently Then, it may be substituted with a fluorine atom.

In the general formula (i) according to the present invention, when B ⁱ¹ represents a 1,4-phenylene group, R ^ib is more preferably a group selected from (R4) and (R5).

In the general formula ^{(i), m i1} is preferably an integer from 0 to ^2, more preferably ^{m i1} is an integer of 0 or ^1, particularly preferably ^{m i1} is zero. That is, the compound represented by the above formula (i) is preferably a 2- to 4-ring compound, more preferably a 2- to 3-ring compound, and particularly preferably a 2-ring compound.

Moreover, it is preferable that the compound represented by the said general formula (i) is equipped with two cyclohexane rings in a molecule | numerator. Therefore, in the general formula (i), one group selected from the group consisting of m ⁱ¹ A ⁱ¹ and B ⁱ¹ is preferably a 1,4-cyclohexylene group, and B ⁱ¹ is 1,4 -A cyclohexylene group is particularly preferred.

  The lower limit of the preferable content of the compound represented by the formula (i) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 5%, 10%, 13%, 15%, 17%, 20%, 23%, 25%, 30%, 31%, 32%, 33%, 34%, 36%, 38% and 39%. The upper limit value of the preferable content is 65%, 63%, 60%, 58%, 57%, and 55% with respect to the total amount of the liquid crystal composition of the present invention, 53%, 52%, 50%, 48%, 40%, 37%, 35%, 33%, 30%, 27%, 25%, 23%, 20%, 17%, 15%, 13%, 10%.

  The compound represented by the general formula (i) is preferably the following general formula (ia).

(In the general formula ( ^ia ), R ^ia and R ^ib are each independently an alkenyl group having 2 to 5 carbon atoms,
A ⁱ³ represents the following groups (a) and (b):
(A) 1,4-cyclohexylene group (one —CH ₂ — present in this group or two or more non-adjacent —CH ₂ — may be replaced by —O—).
(B) 1,4-phenylene group (one -CH = present in this group or two or more non-adjacent -CH = may be replaced by -N =).
The group (a) and the group (b) may be each independently substituted with a cyano group, a fluorine atom or a chlorine atom,
m ⁱ² represents an integer of 0 to 1; )
When m ⁱ² is 1, A ⁱ³ is preferably a 1,4-phenylene group, and in the general formula ( ^ia ), m ⁱ² is particularly preferably 0. When the cyclohexane rings are directly connected and the groups at both ends have an alkenyl group structure, the elastic constant can be improved and a low-viscosity liquid crystal composition can be realized. Thereby, the liquid crystal composition combined with the general formula (ii) or (iii) can realize high-speed response with low viscosity.

  The lower limit of the preferable content of the compound represented by the general formula (ia) with respect to the total amount of the composition of the present invention is 1%, 2%, 3%, 5% Yes, 7%, 8%, 10%, 13%, 15%, 17%, 20%, 23%, 25%, 30% Yes, 31%, 32%, 33%. 34%, 36%, 38%, and 39%. The upper limit of the preferable content is 65%, 63%, 60%, 58%, 57%, 55%, and 53% with respect to the total amount of the composition of the present invention. %, 52%, 50%, 48%, 40%, 37%, 35%, 33%, 30%, 27%, 25% %, 23%, 20%, 17%, 15%, 13%, 12%, and 10%.

  The compound represented by general formula (i) is preferably a compound selected from the group of compounds represented by general formula (i-1).

(Wherein R ^ia and R ^ib each independently represent an alkenyl group having 2 to 8 carbon atoms)
In the above formula (i-1), R ^ia and R ^ib are each independently preferably a linear alkenyl group having 2 to 6 carbon atoms.

The lower limit of the preferable content of the compound represented by the formula (i-1) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 5%, 10%, 13% Yes, 15%, 17%, 20%, 23%, 25%, 30%, 31%, 32%, 33%. 34%, 36%, 38%, and 39%.
The upper limit value of the preferable content is 65%, 63%, 60%, 58%, 57%, and 55% with respect to the total amount of the liquid crystal composition of the present invention, 53%, 52%, 50%, 48%, 40%, 37%, 35%, 33%, 30%, 27%, 25%, 23%, 20%, 17%, 15%, 13%, 10%.

  Further, the compound represented by the general formula (i-1) is preferably a compound selected from the group of compounds represented by the formula (i-1.1) to the formula (i-1.15) From the compound group represented by (i-1.1) to formula (i-1.5), formula (i-1.7), formula (i-1.8), and formula (i-1.14). More preferably, the compound is a compound selected from the group of compounds represented by formula (i-1.1), formula (i-1.2), and formula (i-1.4). preferable.

In particular, the compounds represented by formulas (i-1.1) and (i-1.4) are preferable because the response speed of the liquid crystal composition of the present invention is particularly improved. Moreover, when calculating | requiring Tni higher than a response speed, it represents with Formula (i-1.2), Formula (i-1.3), Formula (i-1.7), and Formula (i-1.8). It is preferable to use the compound. Moreover, in order to improve the solubility at low temperature, it is represented by Formula (i-1.1), Formula (i-1.3), Formula (i-1.4), and Formula (i-1.5). Are preferred. Furthermore, the compounds represented by formula (i-1.1), formula (i-1.2) and formula (i-1.4) are preferable for improving the value of low viscosity and elastic constant K33, From a liquid crystal composition obtained by separately mixing a low-viscosity compound and a compound that improves the value of the elastic constant K33, the formula (i-1.1), the formula (i-1.2), and the formula (i-1. The use of the compound represented by 4) shows more synergy than the former.

  The compound represented by general formula (i) is the following compound represented by general formula (i-2).

(In the formula, R ^ia and R ^ib each independently represent an alkenyl group having 2 to 8 carbon atoms.)
In general formula (i-2), R ^ia and R ^ib are each independently preferably a linear alkenyl group having 2 to 5 carbon atoms.

  The lower limit of the preferable content of the compound represented by the formula (i-2) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 5%, 10%, and 13%. Yes, 15%, 17%, 20%, 23%, 25%, 30%. The upper limit of the preferable content is 60%, 55%, 50%, 45%, 40%, and 37% with respect to the total amount of the liquid crystal composition of the present invention. 35%, 33%, 30%, 27%, 25%, 23%, 20%, 17%, 15%, 13%, 10%.

  Furthermore, the compound represented by the general formula (i-2) is preferably a compound selected from the group of compounds represented by the formula (i-2.1) to the formula (i-2.8) A compound selected from the group of compounds represented by (i-2.1), formula (i-2.2), formula (i-2.5), and formula (i-2.6) is more preferable. .

  The compound represented by general formula (i) is preferably a compound represented by the following general formula (i-3).

(In the formula, R ^ia and R ^ib each independently represent an alkenyl group having 2 to 8 carbon atoms.)
In General Formula (i-3), R ^ia and R ^ib are each independently preferably a linear alkenyl group having 2 to 5 carbon atoms.

  The lower limit of the preferable content of the compound represented by the formula (i-3) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 5%, 10%, 13% Yes, 15%, 17%, 20%, 23%, 25%, 30%. The upper limit of the preferable content is 60%, 55%, 50%, 45%, 40%, and 37% with respect to the total amount of the liquid crystal composition of the present invention. 35%, 33%, 30%, 27%, 25%, 23%, 20%, 17%, 15%, 13%, 10%.

  Furthermore, it is preferable that the compound represented by general formula (i-3) is a compound chosen from the compound group represented by Formula (i-3.1) to Formula (i-3.3).

  The compound represented by the general formula (i) is preferably a compound represented by the following general formula (i-4).

(In the formula, R ^ia and R ^ib each independently represent an alkenyl group having 2 to 8 carbon atoms.)
In general formula (i-4), R ^ia and R ^ib are each independently preferably a linear alkenyl group having 2 to 5 carbon atoms.

  The lower limit of the preferable content of the compound represented by the formula (i-4) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 5%, 10%, 13% Yes, 15%, 17%, 20%, 23%, 25%, 30%. The upper limit of the preferable content is 60%, 55%, 50%, 45%, 40%, and 37% with respect to the total amount of the liquid crystal composition of the present invention. 35%, 33%, 30%, 27%, 25%, 23%, 20%, 17%, 15%, 13%, 10%.

  Furthermore, the compound represented by the general formula (i-4) is preferably a compound selected from the group of compounds represented by the formula (i-4.1) to the formula (i-4.2) The compound represented by (i-4.1) is more preferable.

  The compound represented by the general formula (i) is preferably a compound represented by the following general formula (i-5).

(In the formula, R ^ia and R ^ib each independently represent an alkenyl group having 2 to 8 carbon atoms.)
In General Formula (i-5), R ^ia and R ^ib are each independently preferably a linear alkenyl group having 2 to 5 carbon atoms.

  The lower limit of the preferable content of the compound represented by the formula (i-5) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 5%, 10%, 13% Yes, 15%, 17%, 20%, 23%, 25%, 30%. The upper limit of the preferable content is 60%, 55%, 50%, 45%, 40%, and 37% with respect to the total amount of the liquid crystal composition of the present invention. 35%, 33%, 30%, 27%, 25%, 23%, 20%, 17%, 15%, 13%, 10%.

  Furthermore, the compound represented by the general formula (i-5) is preferably a compound selected from the group of compounds represented by the formula (i-5.1) to the formula (i-5.3).

  The compound represented by the general formula (ii) according to the present invention is preferably a positive compound (Δε value is larger than 2).

In the general formula (ii), R ⁱⁱ¹ preferably represents an alkyl group having 1 to 8 carbon atoms or an alkenyl group having 2 to 8 carbon atoms.

In general formula (ii), K ⁱⁱ¹ and K ⁱⁱ² are each independently a 1,4-cyclohexylene group (one or two or more non-adjacent —CH ₂ — in the group is substituted by —O—). Or a 1,4-phenylene group, and each hydrogen atom in the group may be independently substituted with a fluorine atom.

In the general formula (ii), K ⁱⁱ⁰ is a 1,4-cyclohexylene group (one or two or more non-adjacent —CH ₂ — in the group may be substituted by —O—) or It preferably represents a 1,4-phenylene group.

In general formula ^(ii), there ^may one of Z ^{ii1, Z ii2} or ^{Z ii3} is a single _{bond, -OCH 2 -, - CH 2} O -, - OCF 2 -, - CF 2 O- or _-CH 2 CH ₂ CF ₂ O—, when n ^iik is 0, any one of Z ⁱⁱ¹ and Z ⁱⁱ² represents —OCH ₂ — or —CH ₂ O—, and when n ^ik is 1 or more , Z ⁱⁱ¹ , Z ⁱⁱ² and Z ⁱⁱ³ each represent —OCH ₂ — or —CH ₂ O—, and any one of Z ⁱⁱ¹ , Z ⁱⁱ² or Z ⁱⁱ³ is a single bond, —OCH ₂ -, - _CH 2 O-or _-CH 2 _CH 2 _CF 2 O- to represent, and one of ^{Z ii1, Z i2} or ^{Z ii3} is, _{-OCH 2} - or represent a _-CH 2 O- Is more preferred

In general formula (ii), n ^ik preferably represents 0, 1 or 2, and when n ^ik is 2 or more, K ⁱⁱ² may be the same or different, and n ^ik is 0 or 1. It is more preferable to represent. From the viewpoint of dielectric constant and Δn, it is preferable that three (or more) benzene rings are included.

In general formula ^(ii), there may more preferably represents any two or more fluorine atoms ^{X ii3} or ^{X ii4.}

In the general formula (ii), Y ⁱⁱ¹ is a fluorine atom, a trifluoromethyl group, a fluoromethoxy group, a difluoromethoxy group, a trifluoromethoxy group, a 2,2,2-trifluoroethyl group, or 1 to 5 carbon atoms. Is preferably an alkoxy group (one or more —CH ₂ —CH ₂ — in the group may be substituted by —CH═CH—), a fluorine atom, a trifluoromethyl group, or a trifluoromethoxy group. It is more preferable that

  The lower limit of the preferable content of the compound represented by the general formula (ii) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, and 5%. 8%, 10%, 13%, 15%, 18%, and 20%. The upper limit of the preferable content is 40%, 37%, 35%, 32%, 30%, 28%, 25%, 23%, 20% 18% 15% 13% 10% 10% 8% 5%

  The compound represented by the general formula (ii) according to the present invention preferably has the following partial structure in its structure.

(The black spot in the formula represents a carbon atom in the ring structure to which the partial structure is bonded.)
The compound having the partial structure is preferably at least one selected from the group of compounds represented by general formulas (ii-1) to (ii-9).

  The compound represented by general formula (ii-1) is as follows.

( ^Wherein X ⁱⁱ¹¹¹ and X ⁱⁱ¹¹² each independently represent a fluorine atom or a hydrogen atom, Y ⁱⁱ¹¹¹ represents a fluorine atom, a chlorine atom or OCF ₃ , R ⁱⁱ¹¹¹ represents an alkyl group having 1 to 5 carbon atoms, carbon ^Represents an alkenyl group having 2 to 5 atoms or an alkoxy group having 1 to 4 carbon atoms, and W ⁱⁱ¹¹¹ and W ⁱⁱ¹¹² each independently represent —CH ₂ — or —O—.
In General Formula (ii-1), when at least one of W ⁱⁱ¹¹¹ and W ⁱⁱ¹¹² is —O—, X ⁱⁱ¹¹¹ and X ⁱⁱ¹¹² are preferably fluorine atoms.

  The lower limit of the preferable content of the compound represented by the general formula (ii-1) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5% 8%, 10%, 13%, 15%, 18%, 20%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  When the composition of the liquid crystal composition of the present invention is kept low and a composition having a high response speed is required, it is preferable to lower the lower limit and lower the upper limit. Furthermore, when a composition that does not easily cause seizure is required, it is preferable to lower the lower limit and lower the upper limit. Further, when it is desired to increase the dielectric anisotropy in order to keep the driving voltage low, it is preferable to increase the upper limit value while increasing the lower limit value.

  Furthermore, the compounds represented by the general formula (ii-1) used in the liquid crystal composition of the present invention are specifically represented by the formulas (ii-1.1) to (ii-1.12). In particular, it is preferable to contain a compound represented by formula (ii-1.5) to formula (ii-1.12.).

  The lower limit of the preferable content of these compounds with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5%, 8%, 10% 13%, 15%, 18%, 20%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  The compound represented by general formula (ii-2) is as follows.

(In the formula, X ^{ii121 to} X ⁱⁱ¹²⁴ each independently represents a fluorine atom or a hydrogen atom, Y ⁱⁱ¹²¹ represents a fluorine atom, a chlorine atom or OCF ₃ , and R ⁱⁱ¹²¹ represents an alkyl group having 1 to 5 carbon atoms, carbon Represents an alkenyl group having 2 to 5 atoms or an alkoxy group having 1 to 4 carbon atoms.)
The lower limit of the preferable content of the compound represented by the general formula (ii-2) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5% 8%, 10%, 13%, 15%, 18%, 20%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  When the composition of the liquid crystal composition of the present invention is kept low and a composition having a high response speed is required, it is preferable to lower the lower limit and lower the upper limit. Furthermore, when a composition that does not easily cause seizure is required, it is preferable to lower the lower limit and lower the upper limit. Further, when it is desired to increase the dielectric anisotropy in order to keep the driving voltage low, it is preferable to increase the upper limit value while increasing the lower limit value.

  Furthermore, the compound represented by the general formula (ii-2) used in the liquid crystal composition of the present invention is specifically represented by the formula (ii-2.1) to the formula (ii-2.8). In particular, it is preferable to contain a compound represented by formula (ii-2.1) to formula (ii-2.4).

  The lower limit of the preferable content of these compounds with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5%, 8%, 10% 13%, 15%, 18%, 20%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  The compound represented by general formula (ii-3) is as follows.

(In the formula, X ⁱⁱ¹³¹ and ^Xii132 each independently represent a fluorine atom or a hydrogen atom; ^Yii131 represents a fluorine atom, a chlorine atom or OCF ₃ ; ^Rii131 represents an alkyl group having 1 to 5 carbon atoms; ^Represents an alkenyl group having 2 to 5 atoms or an alkoxy group having 1 to 4 carbon atoms, and W ⁱⁱ¹³¹ and W ⁱⁱ¹³² each independently represent —CH ₂ — or O—.
The lower limit of the preferable content of the compound represented by the general formula (ii-3) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5% 8%, 10%, 13%, 15%, 18%, 20%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  When the composition of the liquid crystal composition of the present invention is kept low and a composition having a high response speed is required, it is preferable to lower the lower limit and lower the upper limit. Furthermore, when a composition that does not easily cause seizure is required, it is preferable to lower the lower limit and lower the upper limit. Further, when it is desired to increase the dielectric anisotropy in order to keep the driving voltage low, it is preferable to increase the upper limit value while increasing the lower limit value.

  Furthermore, the compound represented by general formula (ii-3) used in the liquid crystal composition of the present invention is specifically represented by formula (ii-3.1) to formula (ii-3.12). In particular, it is preferable to contain a compound represented by formula (ii-3.5) to formula (ii-3.8).

  The lower limit of the preferable content of these compounds with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5%, 8%, 10% 13%, 15%, 18%, 20%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  The compound represented by general formula (ii-4) is as follows.

(In the formula, X ^{ii141 to} X ⁱⁱ¹⁴⁴ each independently represent a fluorine atom or a hydrogen atom, Y ⁱⁱ¹⁴¹ represents a fluorine atom, a chlorine atom or OCF ₃ , and R ⁱⁱ¹⁴¹ represents an alkyl group having 1 to 5 carbon atoms, carbon ^Represents an alkenyl group having 2 to 5 atoms or an alkoxy group having 1 to 4 carbon atoms, and W ⁱⁱ¹⁴¹ and W ⁱⁱ¹⁴² each independently represent —CH ₂ — or —O—.
In General Formula (ii-4), when at least one of W ⁱⁱ¹⁴¹ and W ⁱⁱ¹⁴² is —O—, X ⁱⁱ¹⁴³ and X ⁱⁱ¹⁴⁴ are preferably fluorine atoms.

  The lower limit of the preferable content of the compound represented by the general formula (ii-4) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5% 8%, 10%, 13%, 15%, 18%, 20%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  When the composition of the liquid crystal composition of the present invention is kept low and a composition having a high response speed is required, it is preferable to lower the lower limit and lower the upper limit. Furthermore, when a composition that does not easily cause seizure is required, it is preferable to lower the lower limit and lower the upper limit. Further, when it is desired to increase the dielectric anisotropy in order to keep the driving voltage low, it is preferable to increase the upper limit value while increasing the lower limit value.

  Furthermore, the compound represented by the general formula (ii-4) used in the liquid crystal composition of the present invention is specifically represented by the formula (ii-4.1) to the formula (ii-4.28). From the formulas (ii-4.1) to (ii-4.4), (ii-4.11) to (ii-4.18), (ii-4.21) It is preferable to contain the compound represented by (ii-4.28), and the formula (ii-4.1) to (ii-4.4), (ii-4.11) to (ii-4.14). ), And (ii-4.25) to (ii-4.28) are more preferable.

  The lower limit of the preferable content of these compounds with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5%, 8%, 10% 13%, 15%, 18%, 20%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  The compound represented by general formula (ii-5) is as follows.

(In the formula, X ^{ii151 to} X ⁱⁱ¹⁵⁴ each independently represent a fluorine atom or a hydrogen atom, Y ⁱⁱ¹⁵¹ represents a fluorine atom, a chlorine atom or OCF ₃ , and R ⁱⁱ¹⁵¹ represents an alkyl group having 1 to 5 carbon atoms, carbon ^Represents an alkenyl group having 2 to 5 atoms or an alkoxy group having 1 to 4 carbon atoms, and W ⁱⁱ¹⁵¹ and W ⁱⁱ¹⁵² each independently represent —CH ₂ — or O—.
The lower limit of the preferable content of the compound represented by the general formula (ii-5) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5% 8%, 10%, 13%, 15%, 18%, 20%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  When the composition of the liquid crystal composition of the present invention is kept low and a composition having a high response speed is required, it is preferable to lower the lower limit and lower the upper limit. Furthermore, when a composition that does not easily cause seizure is required, it is preferable to lower the lower limit and lower the upper limit. Further, when it is desired to increase the dielectric anisotropy in order to keep the driving voltage low, it is preferable to increase the upper limit value while increasing the lower limit value.

  Furthermore, the compounds represented by the general formula (ii-5) used in the liquid crystal composition of the present invention are specifically represented by the formulas (ii-5.1) to (ii-5.8). It is preferable that it contains a compound represented by formula (ii-5.5) and formula (ii-5.8).

  The lower limit of the preferable content of these compounds with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5%, 8%, 10% 13%, 15%, 18%, 20%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  The compound represented by general formula (ii-6) is as follows.

(In the formula, X ⁱⁱ¹⁶¹ and X ⁱⁱ¹⁶² each independently represent a fluorine atom or a hydrogen atom; Y ⁱⁱ¹⁶¹ represents a fluorine atom, a chlorine atom or OCF ₃ ; and R ⁱⁱ¹⁶¹ represents an alkyl group having 1 to 5 carbon atoms, carbon ^Represents an alkenyl group having 2 to 5 atoms or an alkoxy group having 1 to 4 carbon atoms, and W ⁱⁱ¹⁶¹ and W ⁱⁱ¹⁶² each independently represent —CH ₂ — or O—.
The lower limit of the preferable content of the compound represented by the general formula (ii-6) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5% 8%, 10%, 13%, 15%, 18%, 20%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  When the composition of the liquid crystal composition of the present invention is kept low and a composition having a high response speed is required, it is preferable to lower the lower limit and lower the upper limit. Furthermore, when a composition that does not easily cause seizure is required, it is preferable to lower the lower limit and lower the upper limit. Further, when it is desired to increase the dielectric anisotropy in order to keep the driving voltage low, it is preferable to increase the upper limit value while increasing the lower limit value.

  Furthermore, the compound represented by the general formula (ii-6) used for the liquid crystal composition of the present invention is specifically represented by the formula (ii-6.1) to the formula (ii-6.14). The compounds represented by formula (ii-6.5) to formula (ii-6.8) and formula (ii-6.11) to formula (ii-6.14) are particularly preferable. It is preferable to contain.

  The lower limit of the preferable content of these compounds with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5%, 8%, 10% 13%, 15%, 18%, 20%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  The compound represented by general formula (ii-7) is as follows.

(In the formula, X ^{ii171 to} X ⁱⁱ¹⁷⁴ each independently represents a fluorine atom or a hydrogen atom, Y ⁱⁱ¹⁷¹ represents a fluorine atom, a chlorine atom or OCF ₃ , and R ⁱⁱ¹⁷¹ represents an alkyl group having 1 to 5 carbon atoms, carbon Represents an alkenyl group having 2 to 5 atoms or an alkoxy group having 1 to 4 carbon atoms.)
The lower limit of the preferable content of the compound represented by Formula (ii-7) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5% 8%, 10%, 13%, 15%, 18%, 20%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  When the composition of the liquid crystal composition of the present invention is kept low and a composition having a high response speed is required, it is preferable to lower the lower limit and lower the upper limit. Furthermore, when a composition that does not easily cause seizure is required, it is preferable to lower the lower limit and lower the upper limit. Further, when it is desired to increase the dielectric anisotropy in order to keep the driving voltage low, it is preferable to increase the upper limit value while increasing the lower limit value.

  Furthermore, the compounds represented by the general formula (ii-7) used in the liquid crystal composition of the present invention are specifically represented by the formulas (ii-7.1) to (ii-7.8). In particular, it is preferable to contain a compound represented by formula (ii-7.1) to formula (ii-7.4).

  The lower limit of the preferable content of these compounds with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5%, 8%, 10% 13%, 15%, 18%, 20%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  The compound represented by general formula (ii-8) is as follows.

(In the formula, X ^{ii181 to} X ⁱⁱ¹⁸⁴ each independently represents a fluorine atom or a hydrogen atom, Y ⁱⁱ¹⁸¹ represents a fluorine atom, a chlorine atom or OCF ₃ , and R ⁱⁱ¹⁸¹ represents an alkyl group having 1 to 5 carbon atoms, carbon ^Represents an alkenyl group having 2 to 5 atoms or an alkoxy group having 1 to 4 carbon atoms, and W ⁱⁱ¹⁸¹ and W ⁱⁱ¹⁸² each independently represent —CH ₂ — or —O—.
In general formula (ii-8), it is preferable that at least one of W ⁱⁱ¹⁸¹ and W ⁱⁱ¹⁸² be —O—. When —O— is introduced into at least one of W ¹⁸¹ and W ¹⁸² , the dielectric anisotropy and elastic constant K11 can be increased. It is preferable when importance is attached to solubility only one of ^{W Ii181} and ^{W Ii182} is -O-, and it when importance is attached to dielectric anisotropy both ^{W Ii181} and ^{W Ii182} is -O- preferably, in either ^case, either ^{X Ii181} or ^{X Ii182,} or by replacing both ^{X Ii181} and ^{X Ii182} fluorine, it is possible to obtain a higher dielectric anisotropy and high solubility, both Is replaced with a fluorine atom, the effect of increasing the elastic constant K11 is somewhat diminished.

In general formula (ii-8), it is preferable that at least one of ^Xii183 and ^Xii184 is a fluorine atom, and it is still more preferable that both are fluorine atoms. Both W ^Ii181 and ^{W Ii182} is -CH ₂ - ^be, either or both of ^{X Ii181} and ^{X Ii182} by substituted by fluorine, it is possible to obtain a high dielectric anisotropy and high solubility However, in that case, the elastic constant K11 is significantly lower than that of the compound into which -o- is introduced. This decrease in elastic constant may cause a decrease in threshold voltage in a TN display, a decrease in drive voltage in an IPS display and an FFS display, a decrease in transmittance, and a deterioration in response speed of return. ⁱⁱ¹⁸¹ and ^{W ii182, and, X ii181} and ^{X Ii182} is appropriately selected depending on the purpose. Y ⁱⁱ¹⁸¹ is preferably a fluorine atom, —OCF ₃ , —CF ₃ , or a fluorinated alkyl group having 2 or more carbon atoms, and particularly preferably fluorine.

  The lower limit of the preferable content of the compound represented by the general formula (ii-8) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 3%, 4% 5%, 8%, 10%, 12%, 13%, 15%, 18%, 20%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  When the composition of the liquid crystal composition of the present invention is kept low and a composition having a high response speed is required, it is preferable to lower the lower limit and lower the upper limit. Furthermore, when a composition that does not easily cause seizure is required, it is preferable to lower the lower limit and lower the upper limit. Further, when it is desired to increase the dielectric anisotropy in order to keep the driving voltage low, it is preferable to increase the upper limit value while increasing the lower limit value.

  Further, the compound represented by the general formula (ii-8) used in the liquid crystal composition of the present invention is specifically represented by the formula (ii-8.1) to the formula (ii-8.52). The compounds represented by formula (ii-8.21) to formula (ii-8.32) and formula (ii-8.41) to formula (ii-8.48) are particularly preferable. It is preferable to contain.

  The lower limit of the preferable content of these compounds with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5%, 8%, 10% 13%, 15%, 18%, 20%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  The compound represented by general formula (ii-9) is as follows.

( ^Wherein , X ^{ii191 to} X ⁱⁱ¹⁹⁶ each independently represent a fluorine atom or a hydrogen atom, Y ⁱⁱ¹⁹¹ represents a fluorine atom, a chlorine atom or OCF ₃ , and R ⁱⁱ¹⁹¹ represents an alkyl group having 1 to 5 carbon atoms, carbon Represents an alkenyl group having 2 to 5 atoms or an alkoxy group having 1 to 4 carbon atoms.)
In the above general formula (ii-9), X ⁱⁱ¹⁹¹ or X ⁱⁱ¹⁹² is preferably a hydrogen atom.

In the above general formula (ii-9), it is preferable that either X ⁱⁱ¹⁹³ or X ⁱⁱ¹⁹⁴ is a fluorine atom.

In the above general formula (ii-9), X ⁱⁱ¹⁹⁵ and X ⁱⁱ¹⁹⁶ are preferably fluorine atoms.

In the general formula (ii-9), Y ⁱⁱ¹⁹¹ is preferably a fluorine atom.

  The lower limit of the preferable content of the compound represented by the general formula (ii-9) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5% 8%, 10%, 13%, 15%, 18%, 20%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  When the composition of the liquid crystal composition of the present invention is kept low and a composition having a high response speed is required, it is preferable to lower the lower limit and lower the upper limit. Furthermore, when a composition that does not easily cause seizure is required, it is preferable to lower the lower limit and lower the upper limit. Further, when it is desired to increase the dielectric anisotropy in order to keep the driving voltage low, it is preferable to increase the upper limit value while increasing the lower limit value.

  Furthermore, the compound represented by the general formula (ii-9) used for the liquid crystal composition of the present invention is specifically represented by the formula (ii-9.1) to the formula (ii-9.12). In particular, it is preferable to contain a compound represented by formula (ii-9.5) to formula (ii-9.8).

  The lower limit of the preferable content of these compounds with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5%, 8%, 10% 13%, 15%, 18%, 20%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  The compound represented by the general formula (iii) according to the present invention is preferably a positive compound (the value of Δε is greater than 2).

In general formula (iii), R ⁱⁱⁱ¹ is preferably linear or branched, and more preferably linear. R ⁱⁱⁱ¹ is preferably an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, or an alkoxy group having 1 to 8 carbon atoms, and an alkyl group having 1 to 6 carbon atoms. And an alkenyl group having 2 to 6 carbon atoms or an alkoxy group having 1 to 6 carbon atoms is more preferable.

In general formula (iii), n ⁱⁱⁱ¹ preferably represents 0, 1, 2, or 3, and n ⁱⁱⁱ¹ more preferably represents 0, 1, or 2. When n ⁱⁱⁱ¹ is an integer of 2 or more and there are a plurality of A ⁱⁱⁱ² , they may be the same or different, and n ⁱⁱⁱ¹ is an integer of 2 or more and there are a plurality of Z ⁱⁱⁱ¹ They may be the same or different.

In general formula (iii), A ^K1 and A ^K2 each independently preferably represent a 1,4-phenylene group, and the hydrogen atoms on the phenylene group are each independently substituted with a fluorine atom. May be. Thereby, (DELTA) n of the whole composition can be improved significantly.

In general formula (iii), Z ^K1 and Z ^K2 each independently represent a single bond, —OCH ₂ —, —CH ₂ O—, —OCF ₂ —, —CF ₂ O—, or C≡C—. preferable.

In general formula (iii), it is preferable that ^XK1 and ^XK3 each independently represent a hydrogen atom or a fluorine atom.

In the general formula (iii), Y ^K2 preferably represents a hydrogen atom, a fluorine atom, a trifluoromethyl group, a trifluoromethoxy group, or a 2,2,2-trifluoroethyl group.

  The lower limit of the preferable content of the compound represented by the general formula (iii) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5% 8%, 10%, 13%, 15%, 18%, and 20%. The upper limit of the preferable content is 40%, 37%, 35%, 32%, 30%, 28%, 25%, 23%, 20% 18% 15% 13% 10% 10% 8% 5%

  It is preferable that the compound represented by general formula (iii) is a compound chosen from the compound group represented, for example by general formula (iii-1).

( ^Wherein R ⁱⁱⁱ¹¹ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and X ^{iii11 to} X ⁱⁱⁱ¹⁴ are each independently hydrogen. ^{Represents an} atom or a fluorine atom, and Y ⁱⁱⁱ¹¹ represents a fluorine atom or OCF _3. )
Although there is no restriction | limiting in particular in the kind of compound which can be combined, It uses combining according to desired performance, such as solubility at low temperature, transition temperature, electrical reliability, birefringence. The type of the compound used is, for example, one type as one embodiment of the present invention, two types, and three or more types.

  The lower limit of the preferable content of the compound represented by the formula (iii-1) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 5%, and 8%. Yes, 10%, 13%, 15%, 18%, 20%, 22%, 25%, 30%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  When the composition of the liquid crystal composition of the present invention is kept low and a composition having a high response speed is required, it is preferable to lower the lower limit and lower the upper limit. Furthermore, when the composition of the liquid crystal composition of the present invention maintains a high Tni and has a good temperature stability, it is preferable to lower the lower limit and lower the upper limit. Further, when it is desired to increase the dielectric anisotropy in order to keep the driving voltage low, it is preferable to increase the upper limit value while increasing the lower limit value.

  Further, the compound represented by the general formula (iii-1) is specifically preferably a compound represented by the formula (iii-1.1) to the formula (iii-1.4). A compound represented by iii-1.1) or formula (iii-1.2) is preferred, and a compound represented by formula (iii-1.2) is more preferred. Moreover, it is also preferable to use the compound represented by Formula (iii-1.1) or Formula (iii-1.2) simultaneously.

  The lower limit of the preferable content of these compounds with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5%, 8%, 10% 13%, 15%, 18%, 20%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  It is preferable that the compound represented by general formula (iii) is a compound chosen from the compound group represented, for example by general formula (iii-2).

( ^Wherein R ⁱⁱⁱ²¹ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and X ^{iii21 to} X ⁱⁱⁱ²⁴ are each independently hydrogen. ^{Represents an} atom or a fluorine atom, and Y ⁱⁱⁱ²¹ represents a fluorine atom or OCF _3. )
Although there is no restriction | limiting in particular in the kind of compound which can be combined, It uses combining according to desired performance, such as solubility at low temperature, transition temperature, electrical reliability, birefringence. The type of the compound used is, for example, one type as one embodiment of the present invention, two types, and three or more types.

  The lower limit of the preferable content of the compound represented by the formula (iii-2) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 5%, and 8%. Yes, 10%, 13%, 15%, 18%, 20%, 22%, 25%, 30%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  When the composition of the liquid crystal composition of the present invention is kept low and a composition having a high response speed is required, it is preferable to lower the lower limit and lower the upper limit. Furthermore, when the composition of the liquid crystal composition of the present invention maintains a high Tni and has a good temperature stability, it is preferable to lower the lower limit and lower the upper limit. Further, when it is desired to increase the dielectric anisotropy in order to keep the driving voltage low, it is preferable to increase the upper limit value while increasing the lower limit value.

  Furthermore, specifically, the compound represented by the general formula (iii-2) is preferably a compound represented by the formula (iii-2.1) to the formula (iii-2.6). A compound represented by (iii-2.5) or formula (iii-2.6) is preferred, and a compound represented by formula (iii-2.6) is more preferred. Moreover, it is also preferable to use the compound represented by Formula (iii-2.5) or Formula (iii-2.6) simultaneously.

  The lower limit of the preferable content of these compounds with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5%, 8%, 10% 13%, 15%, 18%, 20%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  It is preferable that the compound represented by general formula (iii) is a compound chosen from the compound group represented, for example by general formula (iii-3).

( ^Wherein R ⁱⁱⁱ³¹ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and X ^{iii31 to} X ⁱⁱⁱ³⁶ are each independently hydrogen. An atom or a fluorine atom, and Y ⁱⁱⁱ³¹ represents a fluorine atom or OCF ₃ )
Although there is no restriction | limiting in particular in the kind of compound which can be combined, It uses combining according to desired performance, such as solubility at low temperature, transition temperature, electrical reliability, birefringence. The type of the compound used is, for example, one type as one embodiment of the present invention, two types, and three or more types.

  The lower limit of the preferable content of the compound represented by the formula (iii-3) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 5%, and 8%. Yes, 10%, 13%, 15%, 18%, 20%, 22%, 25%, 30%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  When the composition of the liquid crystal composition of the present invention is kept low and a composition having a high response speed is required, it is preferable to lower the lower limit and lower the upper limit. Furthermore, when the composition of the liquid crystal composition of the present invention maintains a high Tni and has a good temperature stability, it is preferable to lower the lower limit and lower the upper limit. Further, when it is desired to increase the dielectric anisotropy in order to keep the driving voltage low, it is preferable to increase the upper limit value while increasing the lower limit value.

  Furthermore, the compound represented by the general formula (iii-3) is specifically preferably a compound represented by the formula (iii-3.1) to the formula (iii-3.4). A compound represented by iii-3.1) or formula (iii-3.2) is more preferable. It is also preferable to use the compounds represented by formula (iii-3.1) and formula (iii-3.2) at the same time.

  The lower limit of the preferable content of these compounds with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5%, 8%, 10% 13%, 15%, 18%, 20%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  It is preferable that the compound represented by general formula (iii) is a compound chosen from the compound group represented, for example by general formula (iii-4).

( ^Wherein R ⁱⁱⁱ⁴¹ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and X ^{iii41 to} X ⁱⁱⁱ⁴⁶ are each independently hydrogen. represents an atom or a fluorine ^{atom, Y iii41} represents a fluorine atom or OCF ^{_3, Z iii41} is _{-OCH 2 -, - CH 2 O} -, - OCF 2 - or an _CF 2 O-).
Although there is no restriction | limiting in particular in the kind of compound which can be combined, It uses combining according to desired performance, such as solubility at low temperature, transition temperature, electrical reliability, birefringence. The type of the compound used is, for example, one type as one embodiment of the present invention, two types, and three or more types.

  The lower limit of the preferable content of the compound represented by the formula (iii-4) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 5%, and 8%. Yes, 9%, 10%, 13%, 15%, 18%, 20%, 22%, 25%, 30%. The upper limit of the preferable content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 12% 8% and 5%.

  When the composition of the liquid crystal composition of the present invention is kept low and a composition having a high response speed is required, it is preferable to lower the lower limit and lower the upper limit. Furthermore, when the composition of the liquid crystal composition of the present invention maintains a high Tni and has a good temperature stability, it is preferable to lower the lower limit and lower the upper limit. Further, when it is desired to increase the dielectric anisotropy in order to keep the driving voltage low, it is preferable to increase the upper limit value while increasing the lower limit value.

  Furthermore, the compound represented by the general formula (iii-4) is specifically preferably a compound represented by the formula (iii-4.1) to the formula (iii-4.18). The compounds represented by iii-4.1), formula (iii-4.2), formula (iii-4.11), and (iii-4.12) are more preferable. Moreover, it is also preferable to use simultaneously the compound represented by Formula (iii-4.1), Formula (iii-4.2), Formula (iii-4.11), (iii-4.12).

  The lower limit of the preferable content of these compounds with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5%, 8%, 9% 10%, 13%, 15%, 18%, and 20%. The upper limit of the preferable content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 12% 8% and 5%.

  It is preferable that the compound represented by general formula (iii) is a compound chosen from the compound group represented, for example by general formula (iii-5).

( ^Wherein R ⁱⁱⁱ⁵¹ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and X ^{iii51 to} X ⁱⁱⁱ⁵⁶ are each independently hydrogen. represents an atom or a fluorine ^{atom, Y iii51} represents a fluorine atom or OCF ^{_3, Z iii51} is _{-OCH 2 -, - CH 2 O} -, - OCF 2 - or an _CF 2 O-).
Although there is no restriction | limiting in particular in the kind of compound which can be combined, It uses combining according to desired performance, such as solubility at low temperature, transition temperature, electrical reliability, birefringence. The type of the compound used is, for example, one type as one embodiment of the present invention, two types, and three or more types.

  The lower limit of the preferable content of the compound represented by the formula (iii-5) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 5%, and 8%. Yes, 10%, 13%, 15%, 18%, 20%, 22%, 25%, 30%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  When the composition of the liquid crystal composition of the present invention is kept low and a composition having a high response speed is required, it is preferable to lower the lower limit and lower the upper limit. Furthermore, when the composition of the liquid crystal composition of the present invention maintains a high Tni and has a good temperature stability, it is preferable to lower the lower limit and lower the upper limit. Further, when it is desired to increase the dielectric anisotropy in order to keep the driving voltage low, it is preferable to increase the upper limit value while increasing the lower limit value.

  Further, the compound represented by the general formula (iii-5) is specifically preferably a compound represented by the formula (iii-5.1) to the formula (iii-5.18). A compound represented by formula (iii-5.14) to iii-5.11) is preferable, and a compound represented by formula (iii-5.12) is more preferable.

  The lower limit of the preferable content of these compounds with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5%, 6%, 8% 10%, 13%, 15%, 18%, and 20%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  It is preferable that the compound represented by general formula (iii) is a compound chosen from the compound group represented, for example by general formula (iii-6).

(In the formula, R ⁱⁱⁱ⁶¹ represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and X ^{iii61 to} X ⁱⁱⁱ⁶⁸ are each independently hydrogen. represents an atom or a fluorine ^{atom, Y iii61} represents a fluorine atom or OCF ^{_3, Z iii61} a single _{bond, -OCH 2 -, - CH 2} O -, - OCF 2 - or an _CF 2 O-).
Although there is no restriction | limiting in particular in the kind of compound which can be combined, It uses combining according to desired performance, such as solubility at low temperature, transition temperature, electrical reliability, birefringence. The type of the compound used is, for example, one type as one embodiment of the present invention, two types, and three or more types.

  The lower limit of the preferable content of the compound represented by the formula (iii-6) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 5%, and 8%. Yes, 10%, 13%, 15%, 18%, 20%, 22%, 25%, 30%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  When the composition of the liquid crystal composition of the present invention is kept low and a composition having a high response speed is required, it is preferable to lower the lower limit and lower the upper limit. Furthermore, when the composition of the liquid crystal composition of the present invention maintains a high Tni and has a good temperature stability, it is preferable to lower the lower limit and lower the upper limit. Further, when it is desired to increase the dielectric anisotropy in order to keep the driving voltage low, it is preferable to increase the upper limit value while increasing the lower limit value.

  Furthermore, specifically, the compound represented by the general formula (iii-6) is preferably a compound represented by the formula (iii-6.1) to the formula (iii-6.18). Compounds represented by formulas (iii-6.15) to (iii-6.18) are preferred, and compounds represented by formula (iii-6.16) and formula (iii-6.17) are more preferred. Moreover, it is also preferable to use the compound represented by Formula (iii-6.16) and Formula (iii-6.17) simultaneously.

  The lower limit of the preferable content of these compounds with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5%, 8%, 10% 13%, 15%, 18%, 20%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  The liquid crystal composition according to the present invention may contain one or more compounds represented by the general formula (L) as necessary. The compound represented by the general formula (L) corresponds to a dielectrically neutral compound (Δε value is −2 to 5, preferably −2 to 2).

(Wherein R ^L1 and R ^L2 each independently represent an alkyl group having 1 to 8 carbon atoms, and one or two or more non-adjacent —CH ₂ — in the alkyl group are each independently May be substituted by -CH = CH-, -C≡C-, -O-, -CO-, -COO- or OCO-,
OL represents 0, 1, 2 or 3;
B ^L1 , B ^L2 and B ^L3 each independently represent (a) a 1,4-cyclohexylene group (one —CH ₂ — present in this group or two or more —CH ₂ — not adjacent to each other). May be replaced by -O-) and (b) a 1,4-phenylene group (one -CH = present in this group or two or more non-adjacent -CH = are -N May be replaced by =.)
Represents a group selected from the group consisting of: The above groups (a) and (b) may be each independently substituted with a cyano group, a fluorine atom or a chlorine atom,
L ^L1 and L ^L2 are each independently a single bond, —CH ₂ CH ₂ —, — (CH ₂ ) ₄ —, —OCH ₂ —, —CH ₂ O—, —COO—, —OCO—, —OCF _2. —, —CF ₂ O—, —CH═N—N═CH—, —CH═CH—, —CF═CF— or C≡C—,
When OL is 2 or 3 and a plurality of L ^L2 are present, they may be the same or different, and when OL is 2 or 3 and a plurality of B ^L3 is present, they are the same However, the compound represented by general formula (i), the compound represented by general formula (ii), and the compound represented by general formula (iii) are excluded. )
Although the compound represented by general formula (L) may be used independently, it can also be used in combination. There are no particular restrictions on the types of compounds that can be combined, but they are used in appropriate combinations according to desired properties such as solubility at low temperatures, transition temperatures, electrical reliability, and birefringence. The kind of the compound used is, for example, one kind as one embodiment of the present invention. Alternatively, in another embodiment of the present invention, there are two types, three types, four types, five types, six types, seven types, eight types, nine types, 10 types, More than types.

  In the liquid crystal composition of the present invention, the content of the compound represented by the general formula (L) includes solubility at low temperature, transition temperature, electrical reliability, birefringence, process suitability, dripping marks, and burn-in. Therefore, it is necessary to appropriately adjust according to required performance such as dielectric anisotropy.

  The lower limit of the preferable content of the compound represented by the formula (L) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 10%, 20%, 30%, 40%, 50%, 55%, 60%, 65%, 70%, 75%, 80%. The upper limit of the preferable content is 95%, 85%, 75%, 65%, 55%, 45%, 35%, and 25%.

  When the composition of the liquid crystal composition of the present invention is kept low and a composition having a high response speed is required, the above lower limit value is preferably high and the upper limit value is preferably high. Furthermore, when a composition having a high temperature stability and a high temperature stability is required, the above lower limit value is preferably high and the upper limit value is high. Further, when it is desired to increase the dielectric anisotropy in order to keep the driving voltage low, it is preferable that the above lower limit value is lowered and the upper limit value is low.

When importance is attached to reliability, both R ^L1 and R ^L2 are preferably alkyl groups, and when importance is placed on lowering viscosity, at least one is preferably an alkenyl group.

R ^L1 and R ^L2 are each a linear alkyl group having 1 to 5 carbon atoms or a linear alkyl group having 1 to 4 carbon atoms when the ring structure to which R ^L1 is bonded is a phenyl group (aromatic). When the ring structure to which it is bonded is a saturated ring structure such as cyclohexane, pyran and dioxane, a straight-chain C 1-5 carbon atom is preferred. Alkyl groups, linear alkoxy groups having 1 to 4 carbon atoms and linear alkenyl groups having 2 to 5 carbon atoms are preferred.

  The compound represented by the general formula (L) according to the present invention is selected from at least one or more compounds selected from the group of compounds represented by the following general formula (L-1) to general formula (L-9). Is preferred.

  The compound represented by the general formula (L) is preferably a compound selected from the group of compounds represented by the general formula (L-1).

(In the formula, R ^L11 and R ^L12 are each independently a linear alkyl group having 1 to 5 carbon atoms, a linear alkoxy group having 1 to 4 carbon atoms, and a linear carbon atom number. Represents an alkenyl group of 2 to 5, except for the compound represented by formula (i).
There are no particular restrictions on the types of compounds that can be combined, but they are used in appropriate combinations according to the required properties such as solubility at low temperatures, transition temperatures, electrical reliability, and birefringence. The kind of the compound used is, for example, one kind as one embodiment of the present invention, two kinds, three kinds, four kinds, and five kinds or more.

  The lower limit of the preferable content is 1%, 2%, 3%, 5%, 7%, 10% with respect to the total amount of the liquid crystal composition of the present invention, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%. The upper limit of the preferable content is 95%, 90%, 85%, 80%, 75%, 70% with respect to the total amount of the liquid crystal composition of the present invention, 65%, 60%, 55%, 50%, 45%, 40%, 35%, 30%, 25%.

  When the composition of the liquid crystal composition of the present invention is kept low and a composition having a high response speed is required, the above lower limit value is preferably high and the upper limit value is preferably high. Further, when a composition having a high Tni of the liquid crystal composition of the present invention and having good temperature stability is required, it is preferable that the above lower limit value is medium and the upper limit value is medium. Further, when it is desired to increase the dielectric anisotropy in order to keep the driving voltage low, it is preferable that the above lower limit value is lowered and the upper limit value is low.

  Furthermore, it is preferable that the compound represented by general formula (L-1) is a compound chosen from the compound group represented by general formula (L-1-1).

(Wherein R ^L12 represents the same meaning as in general formula (L-1).)
Furthermore, the compound represented by the general formula (L-1-1) is a compound selected from the group of compounds represented by the formula (L-1-1.1) to the formula (L-1-1.3). It is preferable that it is a compound represented by the formula (L-1-1.2) or the formula (L-1-1.3), and in particular, in the formula (L-1-1.3) It is preferable that it is a compound represented.

  The lower limit of the preferable content of the compound represented by the formula (L-1-1.3) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, and 3%. 5%, 7%, and 10%. The upper limit of the preferable content is 20%, 15%, 13%, 10%, 8%, 7% with respect to the total amount of the liquid crystal composition of the present invention, 6%, 5%, 3%.

  Furthermore, it is preferable that the compound represented by general formula (L-1) is a compound chosen from the compound group represented by general formula (L-1-2).

(Wherein R ^L12 represents the same meaning as in general formula (L-1).)
The lower limit of the preferable content of the compound represented by the formula (L-1-2) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 5%, 10%, 15 %, 20%, and 30%. The upper limit of the preferable content is 60%, 55%, 50%, 45%, 40%, 35% with respect to the total amount of the liquid crystal composition of the present invention, 33% and 30%.

  Furthermore, the compound represented by the general formula (L-1-2) is a compound selected from the group of compounds represented by the formula (L-1-2.1) to the formula (L-1-2.4). It is preferable that it is a compound represented by Formula (L-1-2.2) to Formula (L-1-2.4). In particular, the compound represented by the formula (L-1-2.2) is preferable because the response speed of the liquid crystal composition of the invention is particularly improved. Moreover, when calculating | requiring Tni higher than a response speed, it is preferable to use the compound represented by Formula (L-1-2.3) or Formula (L-1-2.4). In order to improve the solubility at low temperature, the content of the compound represented by the formula (L-1-2.3) and the formula (L-1-2.4) is not preferably 30% or more.

  The lower limit of the preferable content of the compound represented by the formula (L-1-2.2) with respect to the total amount of the liquid crystal composition of the present invention is 10%, 15%, and 20%. 25%, 27%, 30%, 35%, and 40%. The upper limit of the preferable content is 60%, 55%, 50%, 45%, 43%, and 40% with respect to the total amount of the liquid crystal composition of the present invention. 38%, 35%, 32%, 30%, 27%, 25%, 22%.

  The preferred total content of the compound represented by formula (L-1-1.3) and the compound represented by formula (L-1-2.2) with respect to the total amount of the liquid crystal composition of the present invention The lower limit values are 10%, 15%, 20%, 25%, 27%, 30%, 35%, and 40%. The upper limit of the preferable content is 60%, 55%, 50%, 45%, 43%, and 40% with respect to the total amount of the liquid crystal composition of the present invention. 38%, 35%, 32%, 30%, 27%, 25%, 22%.

  Furthermore, it is preferable that the compound represented by general formula (L-1) is a compound chosen from the compound group represented by general formula (L-1-3).

(Wherein R ^L11 and R ^L12 represent the same meaning as in general formula (L-1).)
Although there is no restriction | limiting in particular in the kind of compound which can be combined, It combines according to performance requested | required, such as solubility at low temperature, transition temperature, electrical reliability, birefringence. For example, in one embodiment of the present invention, there are one kind, two kinds, and three kinds of compounds to be used.

  In the liquid crystal composition of the present invention, the content of the compound represented by the general formula (L-1-3) is low temperature solubility, transition temperature, electrical reliability, birefringence, process suitability, It is necessary to adjust appropriately according to required performance such as dripping marks, image sticking, and dielectric anisotropy.

  The lower limit of the preferable content of the compound represented by the formula (L-1-3) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 5%, 10%, 15 %, 20%, and 30%. The upper limit of the preferable content is 60%, 55%, 50%, 45%, 40%, 35% with respect to the total amount of the liquid crystal composition of the present invention, 33% and 30%.

  Furthermore, the compound represented by the general formula (L-1-3) is a compound selected from the group of compounds represented by the formula (L-1-3.1) to the formula (L-1-3.4). It is preferable that it is a compound represented by Formula (L-1-3.1), Formula (L-1-3.3), or Formula (L-1-3.4). In particular, the compound represented by the formula (L-1-3.1) is preferable because the response speed of the liquid crystal composition of the invention is particularly improved. Moreover, when calculating | requiring Tni higher than a response speed, it is preferable to use the compound represented by Formula (L-1-3.3) or Formula (L-1-3.4). In order to improve the solubility at low temperature, the content of the compound represented by formula (L-1-3.3) or formula (L-1-3.4) is not preferably 20% or more.

  The lower limit of the preferable content of the compound represented by the formula (L-1-3.1) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, and 3%. 5%, 7%, and 10%. The upper limit of the preferable content is 20%, 15%, 13%, 10%, 8%, 7% with respect to the total amount of the liquid crystal composition of the present invention, 6%, 5%, 3%.

  Furthermore, it is preferable that the compound represented by general formula (L) is a compound chosen from the compound group represented by general formula (L-2).

(In the formula, R ^L21 represents an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and R ^L22 represents an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 4 to 5 carbon atoms. Represents a group or an alkoxy group having 1 to 4 carbon atoms.)
Although there is no restriction | limiting in particular in the kind of compound which can be combined, It combines according to performance requested | required, such as solubility at low temperature, transition temperature, electrical reliability, birefringence. The kind of compound to be used is, for example, one kind and two kinds as one embodiment of the present invention.

  In the liquid crystal composition of the present invention, the content of the compound represented by the general formula (L-2) is low temperature solubility, transition temperature, electrical reliability, birefringence index, process suitability, dropping trace. Therefore, it is necessary to adjust appropriately according to required performance such as image sticking and dielectric anisotropy.

  When emphasizing solubility at low temperatures, the effect is high when the content is set to be large. On the other hand, when the response speed is important, the effect is high when the content is set low. Furthermore, when improving dripping marks and image sticking characteristics, it is preferable to set the content range in the middle.

  The lower limit of the preferable content of the compound represented by the formula (L-2) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 3%, 5% Yes, 7%, 10%. The upper limit of the preferable content is 20%, 15%, 13%, 10%, 8%, 7% with respect to the total amount of the liquid crystal composition of the present invention, 6%, 5%, 3%.

  Furthermore, the compound represented by the general formula (L-2) is preferably a compound selected from the group of compounds represented by the formula (L-2.1) to the formula (L-2.6). It is preferable that it is a compound represented by (L-2.3), Formula (L-2.4), and Formula (L-2.6).

  Furthermore, it is preferable that the compound represented by general formula (L) is a compound chosen from the compound group represented by general formula (L-3).

(In the formula, R ^L31 and R ^L32 each independently represent an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.)
Although there is no restriction | limiting in particular in the kind of compound which can be combined, It combines according to performance requested | required, such as solubility at low temperature, transition temperature, electrical reliability, birefringence. The kind of compound to be used is, for example, one kind and two kinds as one embodiment of the present invention.

  In the liquid crystal composition of the present invention, the content of the compound represented by the general formula (L-3) is low temperature solubility, transition temperature, electrical reliability, birefringence index, process suitability, dropping trace. Therefore, it is necessary to adjust appropriately according to required performance such as image sticking and dielectric anisotropy.

  The lower limit of the preferable content of the compound represented by the formula (L-3) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 3%, 5% Yes, 7%, 10%. The upper limit of the preferable content is 25%, 20%, 15%, 13%, 10%, 8% with respect to the total amount of the liquid crystal composition of the present invention, 7%, 6%, 5%, 3%.

  When a high birefringence is obtained, the effect is high when the content is set to be large. On the other hand, when high Tni is emphasized, the effect is high when the content is set low. Furthermore, when improving dripping marks and image sticking characteristics, it is preferable to set the content range in the middle.

  Furthermore, the compound represented by the general formula (L-3) is preferably a compound selected from the group of compounds represented by the formula (L-3.1) to the formula (L-3.4). A compound represented by formula (L-3.4) from (L-3.2) is preferable.

  Furthermore, it is preferable that the compound represented by general formula (L) is a compound chosen from the compound group represented, for example by general formula (L-4).

(R ^L41 represents an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and R ^L42 represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms, or carbon. Represents an alkoxy group having 1 to 4 atoms, except for the compound represented by formula (i).
Although there is no restriction | limiting in particular in the kind of compound which can be combined, It combines according to performance requested | required, such as solubility at low temperature, transition temperature, electrical reliability, birefringence. The type of the compound used is, for example, one type as one embodiment of the present invention, and two or more types.

  In the liquid crystal composition of the present invention, the content of the compound represented by the general formula (L-4) is low temperature solubility, transition temperature, electrical reliability, birefringence index, process suitability, dropping trace. Therefore, it is necessary to adjust appropriately according to required performance such as image sticking and dielectric anisotropy.

  The lower limit of the preferable content of the compound represented by the formula (L-4) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 3%, 5% Yes, 7%, 10%, 14%, 16%, 20%, 23%, 26%, 30%, 35%, 40% is there. The upper limit of the preferable content of the compound represented by the formula (L-4) with respect to the total amount of the liquid crystal composition of the present invention is 50%, 45%, 40%, and 35%. Yes, 30%, 20%, 15%, 10%, 5%.

  Furthermore, the compound represented by the general formula (L-4) is preferably a compound represented by the formula (L-4.1) to the formula (L-4.3), for example.

  Depending on the required performance such as solubility at low temperature, transition temperature, electrical reliability, birefringence, etc., even if the compound represented by the formula (L-4.1) is contained, the formula (L Even if the compound represented by -4.2) is contained, both the compound represented by formula (L-4.1) and the compound represented by formula (L-4.2) are contained. Or all of the compounds represented by formula (L-4.1) to formula (L-4.3) may be included. The lower limit of the preferable content of the compound represented by Formula (L-4.1) or Formula (L-4.2) with respect to the total amount of the liquid crystal composition of the present invention is 3%, which is 5%. 7%, 9%, 11%, 12%, 13%, 18%, and 21%. Preferred upper limits are 45%, 40%, 35%, 30%, 25%, 23%, 20%, 18%, 15%, 13%.

  When both the compound represented by the formula (L-4.1) and the compound represented by the formula (L-4.2) are contained, both compounds with respect to the total amount of the liquid crystal composition of the present invention The lower limit of the preferable content is 15%, 19%, 24%, and 30%. Preferred upper limits are 45%, 40%, 35%, 30%, 28%, 25%, 23%, 20%, 18%, 15% and 13%.

  Furthermore, the compound represented by the general formula (L-4) is preferably a compound represented by the formula (L-4.4) to the formula (L-4.6), for example.

  Depending on required performance such as solubility at low temperature, transition temperature, electrical reliability, birefringence, etc., even if the compound represented by formula (L-4.4) is contained, formula (L -4.5) contains both the compound represented by formula (L-4.4) and the compound represented by formula (L-4.5). May be.

  The lower limit of the preferable content of the compound represented by the formula (L-4.4) or the formula (L-4.5) with respect to the total amount of the liquid crystal composition of the present invention is 3%, and 5% 7%, 9%, 11%, 12%, 13%, 18%, and 21%. Preferred upper limits are 45%, 40%, 35%, 30%, 25%, 23%, 20%, 18%, 15%, 13%.

  Furthermore, the compound represented by the general formula (L-4) is preferably, for example, a compound represented by the formula (L-4.7) to the formula (L-4.10). The compound represented by -4.9) is preferable.

  Furthermore, it is preferable that the compound represented by general formula (L) is a compound chosen from the compound group represented by general formula (L-5).

(R ^L51 represents an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and R ^L52 represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms, or carbon. Represents an alkoxy group having 1 to 4 atoms, except for the compound represented by formula (i).
Although there is no restriction | limiting in particular in the kind of compound which can be combined, It combines according to performance requested | required, such as solubility at low temperature, transition temperature, electrical reliability, birefringence. The type of the compound used is, for example, one type as one embodiment of the present invention, and two or more types.

  In the liquid crystal composition of the present invention, the content of the compound represented by the general formula (L-5) is such that solubility at low temperature, transition temperature, electrical reliability, birefringence, process suitability, dropping mark Therefore, it is necessary to adjust appropriately according to required performance such as image sticking and dielectric anisotropy.

The lower limit of the preferable content of the compound represented by the formula (L-5) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 3%, 5% Yes, 7%, 10%, 14%, 16%, 20%, 23%, 26%, 30%, 35%, 40% is there. The upper limit of the preferable content of the compound represented by the formula (L-5) with respect to the total amount of the liquid crystal composition of the present invention is 50%, 40%, 35%, and 30%. Yes, 20%, 15%, 10%, 5% Further, the compound represented by the general formula (L-5) is, for example, the formula (L-5.1) or the formula (L A compound represented by -5.2) is preferred, and a compound represented by formula (L-5.1) is particularly preferred. The lower limit of the preferable content of these compounds with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 3%, 5%, and 7%. The upper limit of the preferable content of these compounds is 20%, 15%, 13%, 10%, 9%, and 8%.

  Furthermore, the compound represented by the general formula (L-5) is preferably a compound represented by, for example, the formula (L-5.3) or the formula (L-5.4). The lower limit of the preferable content of these compounds with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 3%, 5%, and 7%. The upper limit of preferable content of these compounds is 20%, 15%, 13%, 10%, 9%, and 6%.

  Furthermore, the compound represented by General Formula (L-5) is preferably a compound selected from the group of compounds represented by Formula (L-5.5) to Formula (L-5.7), Particularly preferred is a compound represented by formula (L-5.7). The lower limit of the preferable content of these compounds with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 3%, 5%, and 7%. The upper limit of the preferable content of these compounds is 20%, 15%, 13%, 10%, and 9%.

  Furthermore, the compound represented by the general formula (L) is preferably selected from the group represented by the general formula (L-6).

(In the formula, R ^L61 and R ^L62 each independently represent an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and X ^L61 and X ^L62 each independently represent a hydrogen atom or fluorine. Represents an atom.)
Although there is no restriction | limiting in particular in the kind of compound which can be combined, It combines according to performance requested | required, such as solubility at low temperature, transition temperature, electrical reliability, birefringence. The type of the compound used is, for example, one type as one embodiment of the present invention, and two or more types.

  In the liquid crystal composition of the present invention, the content of the compound represented by the general formula (L-6) is the solubility at a low temperature, the transition temperature, the electrical reliability, the birefringence, the process suitability, the dropping trace. Therefore, it is necessary to adjust appropriately according to required performance such as image sticking and dielectric anisotropy.

  The lower limit of the preferable content of the compound represented by the formula (L-6) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 3%, 5% Yes, 7%, 10%, 14%, 16%, 20%, 23%, 26%, 30%, 35%, 40% is there. The upper limit of the preferable content of the compound represented by the formula (L-6) with respect to the total amount of the liquid crystal composition of the present invention is 50%, 45%, 40%, and 38%. Yes, 35%, 32%, 30%, 28%, 25%, 20%, 15%, 10%, 5%.

  Furthermore, the compound represented by the general formula (L-6) is preferably a compound represented by the formula (L-6.1) to the formula (L-6.9), for example.

  Although there is no restriction | limiting in particular in the kind of compound which can be combined, It is preferable to contain 1 type-3 types from these compounds, and it is more preferable to contain 1 type-4 types. Further, since the wide molecular weight distribution of the compound to be selected is also effective for solubility, for example, one type of the compound represented by the formula (L-6.1) or (L-6.2), the formula (L- 6.4) or one type from the compound represented by (L-6.5), one type from the compound represented by formula (L-6.6) or formula (L-6.7), formula (L It is preferable to select one compound from the compounds represented by -6.8) or (L-6.9) and combine them appropriately. Among them, the formula (L-6.1), the formula (L-6.3), the formula (L-6.4), the formula (L-6.6), and the formula (L-6.9) are represented. It is preferable to include a compound.

  Furthermore, the compound represented by the general formula (L-6) is preferably a compound represented by the formula (L-6.10) to the formula (L-6.25), for example. L-6.10), Formula (L-6.11), Formula (L-6.12), Formula (L-6.13), Formula (L-6.18) and Formula (L-6.19). It is preferable that it is a compound represented by this.

  The lower limit of the preferable content of these compounds (formula (L-6.1) to formula (L-6.25)) with respect to the total amount of the liquid crystal composition of the present invention is 1%, and 2%. Yes, 3%, 5%, 7%, 10%, 12%. The upper limit of preferable content of these compounds is 30%, 25%, 20%, 15%, 13%, 10%, and 9%.

  Furthermore, the compound represented by General Formula (L) is preferably a compound selected from the group represented by General Formula (L-7).

^{(Wherein, R L71} and ^{R L72} each independently represents an alkyl group, an alkenyl group or an alkoxy group having 1 to 4 carbon atoms 2 to 5 carbon atoms of 1 to 5 carbon ^{atoms, A L71} and A ^L72 each independently represents a 1,4-cyclohexylene group or a 1,4-phenylene group, but the hydrogen atoms on A ^L71 and A ^L72 may each independently be substituted with a fluorine atom, and Q ^L71 Represents a single bond or COO-, and X ^L71 and X ^L72 each independently represents a fluorine atom or a hydrogen atom, except for the compound represented by formula (i).
Although there is no restriction | limiting in particular in the kind of compound which can be combined, It combines according to performance requested | required, such as solubility at low temperature, transition temperature, electrical reliability, birefringence. The kind of the compound used is, for example, one kind as one embodiment of the present invention, two kinds, three kinds, and four kinds.

  In the liquid crystal composition of the present invention, the content of the compound represented by the general formula (L-7) is low temperature solubility, transition temperature, electrical reliability, birefringence, process suitability, dropping trace. Therefore, it is necessary to adjust appropriately according to required performance such as image sticking and dielectric anisotropy.

  The lower limit of the preferable content of the compound represented by the formula (L-7) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 3%, 5% Yes, 7%, 10%, 14%, 16%, 20%. The upper limit of the preferable content of the compound represented by the formula (L-7) with respect to the total amount of the liquid crystal composition of the present invention is 30%, 25%, 23%, and 20%. Yes, 18%, 15%, 10%, 5%.

  When a high Tni embodiment of the liquid crystal composition of the present invention is desired, it is preferable to increase the content of the compound represented by formula (L-7), and when a low viscosity embodiment is desired, It is preferable to reduce the amount.

  Furthermore, the compound represented by General Formula (L-7) is preferably a compound represented by Formula (L-7.1) to Formula (L-7.4), and Formula (L-7. It is preferable that it is a compound represented by 2).

  Furthermore, the compound represented by the general formula (L-7) is preferably a compound represented by the formula (L-7.11) to the formula (L-7.13), and the formula (L-7. It is preferable that it is a compound represented by 11).

  Furthermore, the compound represented by the general formula (L-7) is a compound represented by the formula (L-7.21) to the formula (L-7.23). A compound represented by the formula (L-7.21) is preferable.

  Further, the compound represented by the general formula (L-7) is preferably a compound represented by the formula (L-7.31) to the formula (L-7.34), and the formula (L-7. 31) or / and a compound represented by the formula (L-7.32).

  Furthermore, the compound represented by the general formula (L-7) is preferably a compound represented by the formula (L-7.41) to the formula (L-7.44), and the formula (L-7. 41) or / and a compound represented by the formula (L-7.42).

  Moreover, it is preferable that the compound represented by general formula (L-7) as said 1st component contains at least 1 type or 2 or more types of compounds represented by the following general formula (L-7-1). .

(In the general formula (L-7-1), R ^L72 each independently represents an alkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, and 1 to 10 carbon atoms. And one group selected from the group consisting of alkoxy groups.)
It is preferable that the compound represented by general formula (L-7-1) is included from a viewpoint of the reliability improvement, such as light resistance of a liquid crystal composition, heat resistance, or image sticking.

  Furthermore, the compound represented by the general formula (1) is particularly preferably a compound represented by the formula (L-7.45) to the formula (L-7.49).

  The compound represented by the general formula (L) is preferably selected from the group represented by the following general formula (L-8).

(In the formula, R ^L81 and R ^L82 each independently represent the same meaning as R ^L1 and R ^L2 in General Formula (L), and A ^L81 represents the same meaning or single bond as A ^L1 in General Formula (L)). However, each hydrogen atom on A ^L81 may be independently substituted with a fluorine atom, and X ^{L81 to} X ^L86 each independently represent a fluorine atom or a hydrogen atom.)
^{Wherein, R L81} and ^{R L82} are each independently an alkyl group having 1 to 5 carbon atoms, an alkenyl group or an alkoxy group having 1 to 4 carbon atoms 2 to 5 carbon atoms ^{preferably, A L81} is 1, A 4-cyclohexylene group or a 1,4-phenylene group is preferable, and the hydrogen atoms on A ^L71 and A ^L72 may be each independently substituted with a fluorine atom, and the same in the general formula (L-8) The number of fluorine atoms in the ring structure is preferably 0 or 1, and the number of fluorine atoms in the molecule is preferably 0 or 1.

  Although there is no restriction | limiting in particular in the kind of compound which can be combined, It combines according to performance requested | required, such as solubility at low temperature, transition temperature, electrical reliability, birefringence. The kind of the compound used is, for example, one kind as one embodiment of the present invention, two kinds, three kinds, and four kinds.

  In the liquid crystal composition of the present invention, the content of the compound represented by the general formula (L-8) is the solubility at a low temperature, the transition temperature, the electrical reliability, the birefringence, the process suitability, the dropping trace. Therefore, it is necessary to adjust appropriately according to required performance such as image sticking and dielectric anisotropy.

  The lower limit of the preferable content of the compound represented by the formula (L-8) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 3%, 5% Yes, 7%, 10%, 14%, 16%, 20%. The upper limit of the preferable content of the compound represented by the formula (L-8) with respect to the total amount of the liquid crystal composition of the present invention is 30%, 25%, 23%, and 20%. Yes, 18%, 15%, 10%, 5%.

  When a high Tni embodiment of the liquid crystal composition of the present invention is desired, it is preferable to increase the content of the compound represented by formula (L-8), and when a low viscosity embodiment is desired, It is preferable to reduce the amount.

  Furthermore, the compound represented by General Formula (L-8) is preferably a compound represented by Formula (L-8.1) to Formula (L-8.4), and Formula (L-8. 3), formula (L-8.5), formula (L-8.6), formula (L-8.13), formula (L-8.16) to formula (L-8.18), formula ( More preferably, the compound is represented by formula (L-8.28) to L-8.23).

  The compound represented by the general formula (L) is preferably selected from the group represented by the following general formula (L-9).

^{(Wherein, R L91} and ^{R L92} represent each independently an alkyl group having 1 to 5 carbon atoms, an alkenyl group or an alkoxy group having 1 to 4 carbon atoms 2 to 5 carbon atoms.)
The lower limit of the preferable content of the compound represented by Formula (L-9) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5% 7%, 9%, 10%, 12%, 15%, and 17%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  A liquid crystal compound having an allyl ether group at the end has good characteristics as a component of the liquid crystal composition, but has a problem in reliability. However, the compound represented by the general formula (L-9) is remarkably improved in reliability by difluorinating a specific position of the benzene ring having an allyl ether group without impairing the original excellent characteristics of the skeleton. Improve, further improve compatibility, reduce viscosity. Furthermore, the dielectric anisotropy may have a slight positive dielectric anisotropy (5 or less) depending on the type of the side chain group. It is classified as.

In addition, when an alkyl group or an alkenyl group substituted with a fluorine atom in R ^L92 in the general formula (L-9) is selected, a positive dielectric anisotropy can be imparted. is there. For example, the compound represented by the general formula (L-9) alone exhibits a liquid crystal phase in the range of 40 to 110 ° C., Δn is about 0.26, the flow viscosity is as low as about 25 mPa · s, and the dielectric constant The anisotropy is about +4 to 5, and when used as a component of a liquid crystal composition, it has extremely good compatibility.

  Furthermore, the compound represented by the general formula (L-9) used for the liquid crystal composition of the present invention is specifically represented by the formula (L-9.1) to the formula (L-9.24). The compounds represented by formula (L-9.5), formula (L-9.6), formula (L-9.13) and formula (L-9.14) are particularly preferable. It is preferable to contain.

  The lower limit of the preferable content of these compounds with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5%, 6%, 7% 8%, 9%, 10%, 13%, 15%, 18%, 20%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  The liquid crystal composition according to the present invention preferably contains one or more compounds represented by formula (J) as necessary. These compounds correspond to dielectrically positive compounds (Δε is greater than 2).

(Wherein R ^J1 represents an alkyl group having 1 to 8 carbon atoms, and one or two or more non-adjacent —CH ₂ — in the alkyl group are each independently —CH═CH—, — Optionally substituted by C≡C—, —O—, —CO—, —COO— or OCO—,
n ^J1 represents 0, 1, 2, 3 or 4;
A ^J1 , A ^J2 and A ^J3 are each independently
(A) 1,4-cyclohexylene group (this is present in the group one -CH ₂ - or non-adjacent two or more -CH ₂ - may be replaced by -O-.)
(B) a 1,4-phenylene group (one —CH═ present in the group or two or more non-adjacent —CH═ may be replaced by —N═) and (c) (C) Naphthalene-2,6-diyl group, 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or decahydronaphthalene-2,6-diyl group (naphthalene-2,6-diyl group or One —CH═ present in the 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or two or more non-adjacent —CH═ may be replaced by —N═. )
And a group (a), a group (b) and a group (c) are each independently a cyano group, a fluorine atom, a chlorine atom, a methyl group, a trifluoromethyl group or a trifluoro group. May be substituted with a methoxy group,
Z ^J1 and Z ^J2 are each independently a single bond, —CH ₂ CH ₂ —, — (CH ₂ ) ₄ —, —OCH ₂ —, —CH ₂ O—, —OCF ₂ —, —CF ₂ O—, -COO-, -OCO- or C≡C-
when n ^J1 is 2, 3 or 4 and a plurality of A ^J2 are present, they may be the same or different; n ^J1 is 2, 3 or 4 and a plurality of Z ^J1 is present If they are the same or different,
X ^J1 represents a hydrogen atom, a fluorine atom, a chlorine atom, a cyano group, a trifluoromethyl group, a fluoromethoxy group, a difluoromethoxy group, a trifluoromethoxy group, or a 2,2,2-trifluoroethyl group. The compounds represented by (i), (ii), (iii) and the general formula (L) are excluded. )
In general formula (J), R ^J1 represents an alkyl group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, or an alkenyloxy having 2 to 8 carbon atoms. Group is preferable, an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms or an alkenyloxy group having 2 to 5 carbon atoms is preferable. An alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms is more preferable, an alkyl group having 2 to 5 carbon atoms or an alkenyl group having 2 to 3 carbon atoms is more preferable, and an alkenyl group having 3 carbon atoms. (Propenyl group) is particularly preferred.

R ^J1 is preferably an alkyl group when emphasizing reliability, and is preferably an alkenyl group when emphasizing a decrease in viscosity.

  Further, when the ring structure to which it is bonded is a phenyl group (aromatic), a linear alkyl group having 1 to 5 carbon atoms, a linear alkoxy group having 1 to 4 carbon atoms, and carbon An alkenyl group having 4 to 5 atoms is preferable, and when the ring structure to which the alkenyl group is bonded is a saturated ring structure such as cyclohexane, pyran and dioxane, a linear alkyl group having 1 to 5 carbon atoms, a straight chain A linear alkoxy group having 1 to 4 carbon atoms and a linear alkenyl group having 2 to 5 carbon atoms are preferred. In order to stabilize the nematic phase, the total number of carbon atoms and oxygen atoms, if present, is preferably 5 or less, and is preferably linear.

  The alkenyl group is preferably selected from groups represented by any one of the formulas (R1) to (R5). (The black dot in each formula represents the carbon atom in the ring structure to which the alkenyl group is bonded.)

A ^J1 , A ^J2 and A ^J3 are preferably aromatic when it is required to independently increase Δn, and are preferably aliphatic to improve the response speed. 1,4-cyclohexylene group, 1,4-phenylene group, 1,4-cyclohexenylene group, 1,4-bicyclo [2.2.2] octylene group, piperidine-1,4-diyl group, naphthalene It preferably represents a -2,6-diyl group, a decahydronaphthalene-2,6-diyl group or a 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, which are substituted by fluorine atoms It is more preferable to represent the following structure,

  It is more preferable to represent the following structure.

Z ^J1 and Z ^J2 each independently preferably represent —CH ₂ O—, —OCH ₂ —, —CF ₂ O—, —CH ₂ CH ₂ —, —CF ₂ CF ₂ — or a single bond, OCH ₂ —, —CF ₂ O—, —CH ₂ CH ₂ — or a single bond is more preferred, and —OCH ₂ —, —CF ₂ O— or a single bond is particularly preferred.

X ^J1 is preferably a fluorine atom or a trifluoromethoxy group, and more preferably a fluorine atom.

n ^J1 is preferably 0, 1, 2 or 3, preferably 0, 1 or 2, preferably 0 or 1 when emphasizing the improvement of Δε, and preferably 1 or 2 when emphasizing Tni. .

  Although there is no restriction | limiting in particular in the kind of compound which can be combined, It uses combining according to desired performance, such as solubility at low temperature, transition temperature, electrical reliability, birefringence. For example, in one embodiment of the present invention, there are one kind, two kinds, and three kinds of compounds to be used. Furthermore, in another embodiment of the present invention, there are four types, five types, six types, and seven or more types.

  In the liquid crystal composition of the present invention, the content of the compound represented by the general formula (J) includes solubility at low temperature, transition temperature, electrical reliability, birefringence, process suitability, dripping marks, and burn-in. Therefore, it is necessary to appropriately adjust according to required performance such as dielectric anisotropy.

  The lower limit of the preferable content of the compound represented by the general formula (J) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 10%, 20%, 30%. , 40%, 50%, 55%, 60%, 65%, 70%, 75%, and 80%. The upper limit of the preferable content is, for example, 95%, 85%, 75%, 65%, and 55% with respect to the total amount of the liquid crystal composition of the present invention. 45%, 35%, 25%.

  When the composition of the liquid crystal composition of the present invention is kept low and a composition having a high response speed is required, it is preferable to lower the lower limit and lower the upper limit. Furthermore, when the composition of the liquid crystal composition of the present invention maintains a high Tni and has a good temperature stability, it is preferable to lower the lower limit and lower the upper limit. Further, when it is desired to increase the dielectric anisotropy in order to keep the driving voltage low, it is preferable to increase the upper limit value while increasing the lower limit value.

R ^J1 is preferably an alkyl group when emphasizing reliability, and is preferably an alkenyl group when emphasizing a decrease in viscosity.

  As the compound represented by the general formula (J), a compound represented by the general formula (M) is preferable.

  The liquid crystal composition of the present invention preferably contains one or more compounds represented by formula (M). These compounds correspond to dielectrically positive compounds (Δε is greater than 2).

  The compound represented by the general formula (M) is:

(Wherein R ^M1 represents an alkyl group having 1 to 8 carbon atoms, and one or two or more non-adjacent —CH ₂ — in the alkyl group are each independently —CH═CH—, — Optionally substituted by C≡C—, —O—, —CO—, —COO— or OCO—,
PM represents 0, 1, 2, 3 or 4;
C ^M1 and C ^M2 are each independently
(D) 1,4-cyclohexylene group (the one present in the group -CH ₂ - or 2 nonadjacent or more -CH ₂ - may be replaced by -O- or S- .) And (e) 1,4-phenylene group (one —CH═ present in this group or two or more —CH═ not adjacent to each other may be replaced by —N═).
A hydrogen atom on the group (d) and the group (e) may be independently substituted with a cyano group, a fluorine atom or a chlorine atom,
K ^M1 and K ^M2 are each independently a single bond, —CH ₂ CH ₂ —, — (CH ₂ ) ₄ —, —OCH ₂ —, —CH ₂ O—, —OCF ₂ —, —CF ₂ O—, -COO-, -OCO- or C≡C-
When PM is 2, 3 or 4 and there are a plurality of K ^M1 , they may be the same or different, and when PM is 2, 3 or 4 and there are a plurality of C ^M2 They may be the same or different,
X ^M1 and X ^M3 each independently represent a hydrogen atom, a chlorine atom or a fluorine atom,
X ^M2 represents a hydrogen atom, a fluorine atom, a chlorine atom, a cyano group, a trifluoromethyl group, a fluoromethoxy group, a difluoromethoxy group, a trifluoromethoxy group, or a 2,2,2-trifluoroethyl group. However, the compound represented by the general formula (L), the compound represented by the general formula (i), the compound represented by the general formula (ii), the general formula (iii), and the general formula (L). Excluding compounds. )
Although there is no restriction | limiting in particular in the kind of compound which can be combined, It uses combining according to desired performance, such as solubility at low temperature, transition temperature, electrical reliability, birefringence. For example, in one embodiment of the present invention, there are one kind, two kinds, and three kinds of compounds to be used. Furthermore, in another embodiment of the present invention, there are four types, five types, six types, and seven or more types.

  In the liquid crystal composition of the present invention, the content of the compound represented by the general formula (M) is low temperature solubility, transition temperature, electrical reliability, birefringence, process suitability, dripping marks, image sticking. Therefore, it is necessary to appropriately adjust according to required performance such as dielectric anisotropy.

  The lower limit of the preferable content of the compound represented by the formula (M) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 10%, 20%, 30%, 40%, 50%, 55%, 60%, 65%, 70%, 75%, 80%. The upper limit of the preferable content is, for example, 95%, 85%, 75%, 65%, and 55% with respect to the total amount of the liquid crystal composition of the present invention. 45%, 35%, 25%.

  When the composition of the liquid crystal composition of the present invention is kept low and a composition having a high response speed is required, it is preferable to lower the lower limit and lower the upper limit. Furthermore, when the composition of the liquid crystal composition of the present invention maintains a high Tni and has a good temperature stability, it is preferable to lower the lower limit and lower the upper limit. Further, when it is desired to increase the dielectric anisotropy in order to keep the driving voltage low, it is preferable to increase the upper limit value while increasing the lower limit value.

R ^M1 is preferably an alkyl group when emphasizing reliability, and is preferably an alkenyl group when emphasizing a decrease in viscosity.

R ^M1 is a linear alkyl group having 1 to 5 carbon atoms or a linear alkoxy group having 1 to 4 carbon atoms when the ring structure to which R ^M1 is bonded is a phenyl group (aromatic). And when the ring structure to which it is bonded is a saturated ring structure such as cyclohexane, pyran and dioxane, a linear alkyl group having 1 to 5 carbon atoms, A straight-chain alkoxy group having 1 to 4 carbon atoms and a straight-chain alkenyl group having 2 to 5 carbon atoms are preferred.

  The compound represented by the general formula (M) preferably has no chlorine atom in the molecule when chemical stability of the composition is required. Further, the compound having a chlorine atom in the liquid crystal composition is preferably 5% or less, preferably 3% or less, preferably 1% or less, preferably 0.5% or less, It is preferable not to contain substantially. “Substantially not contained” means that only a compound containing a chlorine atom unintentionally enters the composition, such as a compound produced as an impurity during the production of the compound.

  It is preferable that the compound represented by general formula (M) is a compound chosen from the compound group represented, for example by general formula (M-1).

(Wherein, R ^M11 represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and X ^M11 to X ^M15 are each independently hydrogen. An atom or a fluorine atom is represented, and Y ^M11 represents a fluorine atom or OCF _3. )
Although there is no restriction | limiting in particular in the kind of compound which can be combined, It uses combining according to desired performance, such as solubility at low temperature, transition temperature, electrical reliability, birefringence. The type of the compound used is, for example, one type as one embodiment of the present invention, two types, and three or more types.

  The lower limit of the preferable content of the compound represented by the formula (M-1) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 5%, 8% Yes, 10%, 13%, 15%, 18%, 20%, 22%, 25%, 30%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  When the composition of the liquid crystal composition of the present invention is kept low and a composition having a high response speed is required, it is preferable to lower the lower limit and lower the upper limit. Furthermore, when the composition of the liquid crystal composition of the present invention maintains a high Tni and has a good temperature stability, it is preferable to lower the lower limit and lower the upper limit. Further, when it is desired to increase the dielectric anisotropy in order to keep the driving voltage low, it is preferable to increase the upper limit value while increasing the lower limit value.

  Furthermore, the compound represented by the general formula (M-1) is preferably a compound represented by the formula (M-1.1) to the formula (M-1.4). A compound represented by M-1.1) or formula (M-1.2) is preferred, and a compound represented by formula (M-1.2) is more preferred. Moreover, it is also preferable to use the compound represented by a formula (M-1.1) or a formula (M-1.2) simultaneously.

  The lower limit of the preferable content of the compound represented by the formula (M-1.1) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 5%, 6 %. The upper limit of the preferable content is 15%, 13%, 10%, 8%, and 5%.

  The lower limit of the preferable content of the compound represented by the formula (M-1.2) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 5%, 6 %. The upper limit of the preferable content is 30%, 25%, 23%, 20%, 18%, 15%, 13%, 10%, 8% It is.

  The lower limit of the preferable total content of the compounds represented by formula (M-1.1) and formula (M-1.2) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 5% and 6%. The upper limit of the preferable content is 30%, 25%, 23%, 20%, 18%, 15%, 13%, 10%, 8% It is.

  Furthermore, it is preferable that the compound represented by general formula (M) is a compound chosen from the compound group represented, for example by general formula (M-2).

(Wherein, R ^M21 represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and X ^M21 and X ^M22 each independently represent hydrogen. An atom or a fluorine atom is represented, and Y ^M21 represents a fluorine atom, a chlorine atom, or OCF _3. )
The lower limit of the preferable content of the compound represented by the formula (M-1) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 5%, 8% Yes, 10%, 13%, 15%, 18%, 20%, 22%, 25%, 30%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  When the composition of the liquid crystal composition of the present invention is kept low and a composition having a high response speed is required, it is preferable to lower the lower limit and lower the upper limit. Furthermore, when the composition of the liquid crystal composition of the present invention is required to maintain a high Tni and hardly burn-in, it is preferable to lower the lower limit and lower the upper limit. Further, when it is desired to increase the dielectric anisotropy in order to keep the driving voltage low, it is preferable to increase the upper limit value while increasing the lower limit value.

  Furthermore, the compound represented by General Formula (M-2) is preferably a compound represented by Formula (M-2.1) to Formula (M-2.5). It is preferable that it is a compound represented by 3) or / and a formula (M-2.5).

  The lower limit of the preferable content of the compound represented by the formula (M-2.2) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 5%, 6 %. The upper limit of the preferable content is 15%, 13%, 10%, 8%, and 5%.

  The lower limit of the preferable content of the compound represented by the formula (M-2.3) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 5%, 6 %. The upper limit of the preferable content is 30%, 25%, 23%, 20%, 18%, 15%, 13%, 10%, 8% It is.

  The lower limit of the preferable content of the compound represented by the formula (M-2.5) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 5%, 6 %. The upper limit of the preferable content is 30%, 25%, 23%, 20%, 18%, 15%, 13%, 10%, 8% It is.

  The lower limit of the preferable total content of the compounds represented by formula (M-2.2), (M-2.3) and formula (M-2.5) with respect to the total amount of the liquid crystal composition of the present invention The values are 1%, 2%, 5% and 6%. The upper limit of the preferable content is 30%, 25%, 23%, 20%, 18%, 15%, 13%, 10%, 8% It is.

  The content is preferably 1% or more, more preferably 5% or more, further preferably 8% or more, further preferably 10% or more, and more preferably 14% or more with respect to the total amount of the liquid crystal composition of the present invention. 16% or more is particularly preferable. In consideration of solubility at low temperature, transition temperature, electrical reliability, etc., the maximum ratio is preferably limited to 30% or less, more preferably 25% or less, more preferably 22% or less, and more preferably 20%. Less than is particularly preferred.

  The compound represented by the general formula (M) used in the liquid crystal composition of the present invention is preferably a compound represented by the general formula (M-3).

(Wherein, R ^M31 represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and X ^M31 to X ^M36 each independently represent hydrogen. An atom or a fluorine atom is represented, and Y ^M31 represents a fluorine atom, a chlorine atom or OCF _3. )
There are no particular limitations on the compounds that can be combined, but it is preferable to combine one or more of them in consideration of solubility at low temperatures, transition temperature, electrical reliability, birefringence, and the like.

  The content of the compound represented by the general formula (M-3) is an upper limit and a lower limit for each embodiment in consideration of properties such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. There is a value.

  The lower limit of the preferable content of the compound represented by the formula (M-3) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5% Yes, 8%, 10%, 13%, 15%, 18%, 20%. The upper limit of the preferable content is 20%, 18%, 15%, 13%, 10%, 8%, and 5%.

  Furthermore, the compound represented by General Formula (M-3) used in the liquid crystal composition of the present invention is specifically represented by Formula (M-3.1) to Formula (M-3.4). It is preferable that it contains a compound represented by formula (M-3.1) and / or formula (M-3.2).

  The lower limit of the preferable content of the compound represented by the formula (M-3.1) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5 %, 8%, 10%, 13%, 15%, 18%, and 20%. The upper limit of the preferable content is 20%, 18%, 15%, 13%, 10%, 8%, and 5%.

  The lower limit of the preferable content of the compound represented by the formula (M-3.2) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5 %, 8%, 10%, 13%, 15%, 18%, and 20%. The upper limit of the preferable content is 20%, 18%, 15%, 13%, 10%, 8%, and 5%.

  The lower limit of the preferable total content of the compounds represented by formula (M-3.1) and formula (M-3.2) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5%, 8%, 10%, 13%, 15%, 18%, 20%. The upper limit of the preferable content is 20%, 18%, 15%, 13%, 10%, 8%, and 5%.

  Furthermore, the compound represented by General Formula (M) is preferably a compound selected from the group represented by General Formula (M-4).

(Wherein, R ^M41 represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and X ^M41 to X ^M48 are each independently fluorine. Represents an atom or a hydrogen atom, and Y ^M41 represents a fluorine atom, a chlorine atom or OCF _3. )
There are no particular limitations on the compounds that can be combined, but it is preferable to combine one, two, or three or more types in consideration of solubility at low temperatures, transition temperature, electrical reliability, birefringence, and the like.

  The content of the compound represented by the general formula (M-4) is an upper limit and a lower limit for each embodiment in consideration of properties such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. There is a value.

  The lower limit of the preferable content of the compound represented by the formula (M-4) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5% Yes, 8%, 10%, 13%, 15%, 18%, 20%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  When the liquid crystal composition of the present invention is used for a liquid crystal display device having a small cell gap, it is suitable to increase the content of the compound represented by the general formula (M-4). When used for a liquid crystal display element having a low driving voltage, it is suitable to increase the content of the compound represented by the general formula (M-4). Moreover, when used for a liquid crystal display element used in a low temperature environment, it is suitable to reduce the content of the compound represented by the general formula (M-4). In the case of a liquid crystal composition used for a liquid crystal display device having a high response speed, it is suitable to reduce the content of the compound represented by the general formula (M-4).

  Furthermore, the compound represented by the general formula (M-4) used in the liquid crystal composition of the present invention is specifically represented by the formula (M-4.1) to the formula (M-4.4). It is preferable that it contains a compound represented by formula (M-4.2) to formula (M-4.4), and represented by formula (M-4.2). It is more preferable to contain a compound.

  Furthermore, it is preferable that the compound represented by general formula (M) is a compound represented by general formula (M-5).

(Wherein R ^M51 represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and X ^M51 and X ^M52 are each independently hydrogen. represents an atom or a fluorine ^{atom, Y M51} represents a fluorine atom, a chlorine atom or OCF _3.)
Although there is no restriction | limiting in the kind of compound which can be combined, Considering solubility at low temperature, transition temperature, electrical reliability, birefringence, etc., it uses combining suitably for every embodiment. For example, one embodiment of the present invention has one type, another embodiment has two types, yet another embodiment has three types, yet another embodiment has four types, and yet another embodiment has five types, In still another embodiment, six or more types are combined.

  The lower limit of the preferable content of the compound represented by the formula (M-5) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 5%, and 8%. Yes, 10%, 13%, 15%, 18%, 20%, 22%, 25%, 30%. The upper limit of the preferable content is 50%, 45%, 40%, 35%, 33%, 30%, 28%, 25%, 23% 20%, 18%, 15%, 13%, 10%, 8%, 5%.

  When the composition of the liquid crystal composition of the present invention is kept low and a composition having a high response speed is required, it is preferable to lower the lower limit and lower the upper limit. Furthermore, when the composition of the liquid crystal composition of the present invention is required to maintain a high Tni and hardly burn-in, it is preferable to lower the lower limit and lower the upper limit. Further, when it is desired to increase the dielectric anisotropy in order to keep the driving voltage low, it is preferable to increase the upper limit value while increasing the lower limit value.

  Furthermore, the compound represented by General Formula (M-5) is preferably a compound represented by Formula (M-5.1) to Formula (M-5.4), and Formula (M-5. It is preferable that it is a compound represented by Formula (M-5.4) from 1).

  The lower limit of the preferable content of these compounds with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 5%, 8%, 10%, 13% And 15%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  Furthermore, the compound represented by General Formula (M-5) is preferably a compound represented by Formula (M-5.11) to Formula (M-5.17), and Formula (M-5. 11), a compound represented by formula (M-5.13) and formula (M-5.17) is preferable.

  The lower limit of the preferable content of these compounds with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 5%, 8%, 10%, 13% And 15%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  Furthermore, the compound represented by General Formula (M-5) is preferably a compound represented by Formula (M-5.21) to Formula (M-5.28), and Formula (M-5. 21), a compound represented by formula (M-5.22), formula (M-5.23) and formula (M-5.25).

  The lower limit of the preferable content of these compounds with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 5%, 8%, 10%, 13% 15%, 18%, 20%, 22%, 25%, 30%. The upper limit of the preferable content is 40%, 35%, 33%, 30%, 28%, 25%, 23%, 20%, 18% 15% 13% 10% 8% 5%

  Furthermore, it is preferable that the compound represented by general formula (M) is a compound represented by general formula (M-6).

(Wherein, R ^M61 represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms, and X ^M61 to X ^M64 are each independently fluorine. Represents an atom or a hydrogen atom, and Y ^M61 represents a fluorine atom, a chlorine atom or OCF _3. )
Although there is no restriction | limiting in the kind of compound which can be combined, It combines suitably for every embodiment in consideration of solubility at low temperature, transition temperature, electrical reliability, birefringence, etc.

  The lower limit of the preferable content of the compound represented by the formula (M-6) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, and 5%. Yes, 8%, 10%, 13%, 15%, 18%, 20%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  When the liquid crystal composition of the present invention is used for a liquid crystal display element having a low driving voltage, it is suitable to increase the content of the compound represented by the general formula (M-6). In the case of a liquid crystal composition used for a liquid crystal display device having a high response speed, it is suitable to reduce the content of the compound represented by the general formula (M-6).

  Furthermore, the compound represented by the general formula (M-6) is specifically preferably a compound represented by the formula (M-6.1) to the formula (M-6.4). It is preferable to contain a compound represented by M-6.2) and formula (M-6.4).

  The lower limit of the preferable content of these compounds with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5%, 8%, 10% 13%, 15%, 18%, 20%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  Further, the compound represented by the general formula (M-6) is specifically preferably a compound represented by the formula (M-6.11) to the formula (M-6.14). It is preferable to contain a compound represented by M-6.12) and formula (M-6.14).

  The lower limit of the preferable content of these compounds with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5%, 8%, 10% 13%, 15%, 18%, 20%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  Furthermore, the compound represented by the general formula (M-6) is specifically preferably a compound represented by the formula (M-6.21) to the formula (M-6.24). It is preferable to contain a compound represented by M-6.21), formula (M-6.22) and formula (M-6.24).

  The lower limit of the preferable content of these compounds with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5%, 8%, 10% 13%, 15%, 18%, 20%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  Furthermore, the compound represented by the general formula (M-6) is specifically preferably a compound represented by the formula (M-6.31) to the formula (M-6.34). Among these, it is preferable to contain a compound represented by the formula (M-6.31) and the formula (M-6.32).

  The lower limit of the preferable content of these compounds with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5%, 8%, 10% 13%, 15%, 18%, 20%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  Furthermore, the compound represented by the general formula (M-6) is specifically preferably a compound represented by the formula (M-6.41) to the formula (M-6.44). It is preferable to contain the compound represented by M-6.42).

  The lower limit of the preferable content of these compounds with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5%, 8%, 10% 13%, 15%, 18%, 20%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  Furthermore, it is preferable that the compound represented by general formula (M) is a compound chosen from the compound group represented by general formula (M-7).

(Wherein, X ^M71 to X ^M76 each independently represent a fluorine atom or a hydrogen atom, and R ^M71 represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or 1 to 1 carbon atoms. 4 represents an alkoxy group, and Y ^M71 represents a fluorine atom or OCF _3. )
Although there is no restriction | limiting in particular in the kind of compound which can be combined, It is preferable to contain 1 type-2 types from these compounds, It is more preferable to contain 1 type-3 types, It contains 1 type-4 types. More preferably.

  The content of the compound represented by the general formula (M-7) is an upper limit and a lower limit for each embodiment in consideration of properties such as solubility at low temperature, transition temperature, electrical reliability, and birefringence. There is a value.

  The lower limit of the preferable content of the compound represented by the formula (M-7) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, and 5%. Yes, 8%, 10%, 13%, 15%, 18%, 20%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  When the liquid crystal composition of the present invention is used for a liquid crystal display device having a small cell gap, it is suitable to increase the content of the compound represented by the general formula (M-7). When used for a liquid crystal display element having a low driving voltage, it is suitable to increase the content of the compound represented by the general formula (M-7). Moreover, when used for a liquid crystal display element used in a low temperature environment, it is suitable to reduce the content of the compound represented by the general formula (M-7). In the case of a liquid crystal composition used for a liquid crystal display device having a high response speed, it is suitable to reduce the content of the compound represented by the general formula (M-7).

  Furthermore, the compound represented by General Formula (M-7) is preferably a compound represented by Formula (M-7.1) to Formula (M-7.4), and Formula (M-7. It is preferable that it is a compound represented by 2).

  The lower limit of the preferable content of these compounds with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5%, 8%, 10% 13%, 15%, 18%, 20%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  Furthermore, the compound represented by the general formula (M-7) is preferably a compound represented by the formula (M-7.11) to the formula (M-7.14), and the formula (M-7. 11) and a compound represented by the formula (M-7.12) are preferable.

  The lower limit of the preferable content of these compounds with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5%, 8%, 10% 13%, 15%, 18%, 20%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  Furthermore, the compound represented by General Formula (M-7) is preferably a compound represented by Formula (M-7.21) to Formula (M-7.24), and Formula (M-7. 21) and a compound represented by the formula (M-7.22) are preferable.

  The lower limit of the preferable content of these compounds with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5%, 8%, 10% 13%, 15%, 18%, 20%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  Furthermore, it is preferable that the compound represented by general formula (M) is a compound represented by general formula (M-8).

( ^Wherein , X ^M81 to X ^M84 each independently represent a fluorine atom or a hydrogen atom, Y ^M81 represents a fluorine atom, a chlorine atom or OCF ₃ , R ^M81 represents an alkyl group having 1 to 5 carbon atoms, carbon Represents an alkenyl group having 2 to 5 atoms or an alkoxy group having 1 to 4 carbon atoms, and A ^M81 and A ^M82 each independently represents a 1,4-cyclohexylene group, a 1,4-phenylene group, or

However, the hydrogen atom on the 1,4-phenylene group may be substituted with a fluorine atom. )
The lower limit of the preferable content of the compound represented by Formula (M-8) with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5% 8%, 10%, 13%, 15%, 18%, 20%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  When the composition of the liquid crystal composition of the present invention is kept low and a composition having a high response speed is required, it is preferable to lower the lower limit and lower the upper limit. Furthermore, when a composition that does not easily cause seizure is required, it is preferable to lower the lower limit and lower the upper limit. Further, when it is desired to increase the dielectric anisotropy in order to keep the driving voltage low, it is preferable to increase the upper limit value while increasing the lower limit value.

  Furthermore, the compound represented by General Formula (M-8) used in the liquid crystal composition of the present invention is specifically represented by Formula (M-8.1) to Formula (M-8.4). It is preferable that it contains a compound represented by formula (M-8.1) or formula (M-8.2).

  The lower limit of the preferable content of these compounds with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5%, 8%, 10% 13%, 15%, 18%, 20%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  Furthermore, the compound represented by the general formula (M-8) used in the liquid crystal composition of the present invention is specifically represented by the formula (M-8.11) to the formula (M-8.14). It is preferable that it contains a compound represented by the formula (M-8.12).

  The lower limit of the preferable content of these compounds with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5%, 8%, 10% 13%, 15%, 18%, 20%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  Furthermore, the compound represented by General Formula (M-8) used in the liquid crystal composition of the present invention is specifically represented by Formula (M-8.21) to Formula (M-8.24). It is preferable that it contains a compound represented by the formula (M-8.22).

  The lower limit of the preferable content of these compounds with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5%, 8%, 10% 13%, 15%, 18%, 20%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  Furthermore, the compound represented by General Formula (M-8) used in the liquid crystal composition of the present invention is specifically represented by Formula (M-8.31) to Formula (M-8.34). It is preferable that it contains a compound represented by the formula (M-8.32).

  The lower limit of the preferable content of these compounds with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5%, 8%, 10% 13%, 15%, 18%, 20%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  Furthermore, the compound represented by General Formula (M-8) used in the liquid crystal composition of the present invention is specifically represented by Formula (M-8.41) to Formula (M-8.44). It is preferable that it contains a compound represented by the formula (M-8.42).

  The lower limit of the preferable content of these compounds with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5%, 8%, 10% 13%, 15%, 18%, 20%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  Furthermore, the compound represented by General Formula (M-8) used in the liquid crystal composition of the present invention is specifically represented by Formula (M-8.51) to Formula (M-8.54). It is preferable that it contains a compound represented by the formula (M-8.52).

  The lower limit of the preferable content of these compounds with respect to the total amount of the liquid crystal composition of the present invention is 1%, 2%, 4%, 5%, 8%, 10% 13%, 15%, 18%, 20%. The upper limit of the preferred content is 30%, 28%, 25%, 23%, 20%, 18%, 15%, 13%, 10% 8% and 5%.

  The lower limit of the preferable total content of the compounds represented by general formula (i), general formula (ii) and general formula (iii) with respect to the total amount of the liquid crystal composition of the present invention is 70%. 75%, 78%, 80%, 88%, 90%, 93%, 94%, 95%, 96%, 97%, 98% %, 99%, and 100%. The upper limit of the preferable content is 100%, 99%, 98%, 95%, 90%.

  The preferred total content of the compounds represented by general formula (i), general formula (ii) or general formula (iii), general formula (L) and (J) with respect to the total amount of the liquid crystal composition of the present invention Lower limit of 80%, 85%, 88%, 90%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 100%. The upper limit of the preferable content is 100%, 99%, 98%, and 95%.

  From general formula (i), general formula (ii) or general formula (iii), from general formulas (L-1) to (L-9) and (M-1) with respect to the total amount of the liquid crystal composition of the present invention The lower limit of the preferable total content of the compound represented by (M-8) is 80%, 85%, 88%, 90%, 92%, 93% 94%, 95%, 96%, 97%, 98%, 99%, 100%. The upper limit of the preferable content is 100%, 99%, 98%, and 95%.

  The liquid crystal composition of the present invention preferably does not contain a compound having a structure in which oxygen atoms such as a peracid (—CO—OO—) structure are bonded in the molecule.

  When emphasizing the reliability and long-term stability of the composition, the content of the compound having a carbonyl group is preferably 5% or less, and preferably 3% or less with respect to the total mass of the liquid crystal composition. More preferably, it is more preferably 1% or less, and most preferably not substantially contained.

  When importance is attached to stability by UV irradiation, the content of the compound substituted with chlorine atoms is preferably 15% or less, preferably 10% or less, based on the total mass of the liquid crystal composition, It is preferably 8% or less, more preferably 5% or less, further preferably 3% or less, and still more preferably substantially not contained.

  It is preferable to increase the content of a compound in which all the ring structures in the molecule are 6-membered rings, and the content of the compound in which all the ring structures in the molecule are 6-membered rings is based on the total mass of the liquid crystal composition. It is preferably 80% or more, more preferably 90% or more, still more preferably 95% or more, and the liquid crystal composition is composed only of a compound in which all of the ring structures in the molecule are substantially 6-membered rings. Is most preferable.

  In order to suppress deterioration of the liquid crystal composition due to oxidation, it is preferable to reduce the content of the compound having a cyclohexenylene group as a ring structure, and to reduce the content of the compound having a cyclohexenylene group as the total amount of the liquid crystal composition It is preferably 10% or less, more preferably 8% or less, more preferably 5% or less, more preferably 3% or less, and still more preferably substantially not contained with respect to the mass. .

  When importance is attached to improvement of viscosity and improvement of Tni, the content of a compound having a 2-methylbenzene-1,4-diyl group in the molecule, in which a hydrogen atom may be substituted with a halogen, may be reduced. Preferably, the content of the compound having a 2-methylbenzene-1,4-diyl group in the molecule is preferably 10% or less, more preferably 8% or less, based on the total mass of the liquid crystal composition. It is preferably 5% or less, more preferably 3% or less, and still more preferably substantially not contained.

  In the present application, the phrase “not substantially contained” means that the substance is not contained except for an unintentionally contained substance.

  When the compound contained in the liquid crystal composition of the first embodiment of the present invention has an alkenyl group as a side chain, when the alkenyl group is bonded to cyclohexane, the alkenyl group has 2 to 2 carbon atoms. Preferably, when the alkenyl group is bonded to benzene, the alkenyl group preferably has 4 to 5 carbon atoms, and the unsaturated bond of the alkenyl group and benzene are directly bonded. Preferably not.

  The liquid crystal composition of the present invention may contain a polymerizable compound in order to produce a liquid crystal display element such as a PS mode, a lateral electric field type PSA mode, or a lateral electric field type PSVA mode. Examples of the polymerizable compound that can be used include a photopolymerizable monomer that undergoes polymerization by energy rays such as light. The structure has, for example, a liquid crystal skeleton in which a plurality of six-membered rings such as biphenyl derivatives and terphenyl derivatives are connected. Examples thereof include a polymerizable compound. More specifically, the general formula (XX)

(Wherein X ²⁰¹ and X ²⁰² each independently represent a hydrogen atom or a methyl group,
Sp ²⁰¹ and Sp ²⁰² are each independently a single bond, an alkylene group having 1 to 8 carbon atoms, or O— (CH ₂ ) _s — (wherein _s represents an integer of 2 to 7 and the oxygen atom is aromatic Preferred to be attached to the ring),
Z ²⁰¹ represents —OCH ₂ —, —CH ₂ O—, —COO—, —OCO—, —CF ₂ O—, —OCF ₂ —, —CH ₂ CH ₂ —, —CF ₂ CF ₂ —, —CH═. CH—COO—, —CH═CH—OCO—, —COO—CH═CH—, —OCO—CH═CH—, —COO—CH ₂ CH ₂ —, —OCO—CH ₂ CH ₂ —, —CH ₂ CH ₂ —COO—, —CH ₂ CH ₂ —OCO—, —COO—CH ₂ —, —OCO—CH ₂ —, —CH ₂ —COO—, —CH ₂ —OCO—, —CY ¹ ═CY ² — (Wherein Y ¹ and Y ² each independently represents a fluorine atom or a hydrogen atom), —C≡C— or a single bond;
M ²⁰¹ represents a 1,4-phenylene group, a trans-1,4-cyclohexylene group or a single bond, and all 1,4-phenylene groups in the formula have an arbitrary hydrogen atom substituted with a fluorine atom. Also good. ) Is preferred.

X ²⁰¹ and X ²⁰² are each preferably a diacrylate derivative that represents a hydrogen atom, or a dimethacrylate derivative that has a methyl group, and a compound in which one represents a hydrogen atom and the other represents a methyl group. As for the polymerization rate of these compounds, diacrylate derivatives are the fastest, dimethacrylate derivatives are slow, asymmetric compounds are in the middle, and a preferred embodiment can be used depending on the application. In the PSA display element, a dimethacrylate derivative is particularly preferable.

Sp ²⁰¹ and Sp ²⁰² each independently represent a single bond, an alkylene group having 1 to 8 carbon atoms, or O— (CH ₂ ) _s —, but in a PSA display element, at least one may be a single bond. A compound in which both represent a single bond or an embodiment in which one represents a single bond and the other represents an alkylene group having 1 to 8 carbon atoms or O— (CH ₂ ) _s — is preferable. In this case, the alkyl group of 1-4 is preferable, and 1-4 is preferable for s.

Z ²⁰¹ represents —OCH ₂ —, —CH ₂ O—, —COO—, —OCO—, —CF ₂ O—, —OCF ₂ —, —CH ₂ CH ₂ —, —CF ₂ CF ₂ — or a single bond. Are preferred, —COO—, —OCO— or a single bond is more preferred, and a single bond is particularly preferred.

M ²⁰¹ represents a 1,4-phenylene group, a trans-1,4-cyclohexylene group or a single bond in which any hydrogen atom may be substituted with a fluorine atom, but the 1,4-phenylene group or the single bond is preferable. When C represents a ring structure other than a single bond, Z ²⁰¹ is preferably a linking group other than a single bond. When M ²⁰¹ is a single bond, Z ²⁰¹ is preferably a single bond.

From these points, in general formula (XX), the ring structure between Sp ²⁰¹ and Sp ²⁰² is specifically preferably the structure described below.

In the general formula (XX), when M ²⁰¹ represents a single bond and the ring structure is formed of two rings, it is preferable to represent the following formulas (XXa-1) to (XXa-5), It is more preferable to represent the formula (XXa-3) from (XXa-1), and it is particularly preferable to represent the formula (XXa-1).

(In the formula, both ends shall be bonded to Sp ²⁰¹ or Sp ^202. )
Polymerizable compounds containing these skeletons are optimal for PSA-type liquid crystal display elements because of their alignment regulating power after polymerization, and a good alignment state is obtained, so that display unevenness is suppressed or does not occur at all.

  From the above, as the polymerizable monomer, general formula (XX-1) to general formula (XX-4) are particularly preferable, and among them, general formula (XX-2) is most preferable.

(In the formula, Sp ²⁰ represents an alkylene group having 2 to 5 carbon atoms.)
In the present invention, as a method for polymerizing the polymerizable compound, in order to obtain good alignment performance of the liquid crystal, an appropriate polymerization rate is desirable. Therefore, active energy rays such as ultraviolet rays or electron beams are used singly or in combination or in sequence. A method of polymerizing by irradiating is preferable. When ultraviolet rays are used, a polarized light source or a non-polarized light source may be used. In addition, when the polymerization is performed in a state where the polymerizable compound-containing liquid crystal composition is sandwiched between two substrates, at least the substrate on the irradiation surface side must be given appropriate transparency to the active energy rays. I must. Moreover, after polymerizing only a specific part using a mask at the time of light irradiation, the orientation state of the unpolymerized part is changed by changing conditions such as an electric field, a magnetic field, or temperature, and further irradiation with active energy rays is performed. Then, it is possible to use a means for polymerization. In particular, when ultraviolet exposure is performed, it is preferable to perform ultraviolet exposure while applying an alternating electric field to the polymerizable compound-containing composition. The alternating electric field to be applied is preferably an alternating current having a frequency of 10 Hz to 10 kHz, more preferably a frequency of 60 Hz to 10 kHz, and the voltage is selected depending on a desired pretilt angle of the liquid crystal display element.

The temperature during the irradiation is preferably within a temperature range in which the liquid crystal state of the liquid crystal composition of the present invention is maintained. Polymerization is preferably performed at a temperature close to room temperature, that is, typically at a temperature of 15 to 35 ° C. As a lamp for generating ultraviolet rays, a metal halide lamp, a high-pressure mercury lamp, an ultra-high pressure mercury lamp, or the like can be used. Moreover, as a wavelength of the ultraviolet-rays to irradiate, it is preferable to irradiate the ultraviolet-ray of the wavelength range which is not the absorption wavelength range of a liquid crystal composition, and it is preferable to cut and use an ultraviolet-ray as needed. Intensity of ultraviolet irradiation is ^preferably from ^{0.1mW / cm 2 ~100W / cm 2} , 2mW / cm 2 ~50W / cm 2 is more preferable. The amount of energy of ultraviolet rays to be irradiated can be adjusted as appropriate, but is preferably 10 mJ / cm ² to 500 J / cm ^{2, and} more preferably 100 mJ / cm ² to 200 J / cm ² . When irradiating with ultraviolet rays, the intensity may be changed. The time for irradiating with ultraviolet rays is appropriately selected depending on the intensity of the irradiating ultraviolet rays.

  In the case of adding a monomer to the liquid crystal composition of the present invention, the polymerization proceeds even when no polymerization initiator is present, but may contain a polymerization initiator in order to accelerate the polymerization. Examples of the polymerization initiator include benzoin ethers, benzophenones, acetophenones, benzyl ketals, acylphosphine oxides, and the like.

  The liquid crystal composition in the invention can further contain a compound represented by the general formula (Q).

(Wherein, R ^Q represents a straight-chain alkyl group or branched alkyl group having from 1 22 carbon atoms, one or more CH ₂ groups in the alkyl group, so that the oxygen atoms are not directly adjacent a, -O -, - CH = CH -, - CO -, - OCO -, - COO -, - C≡C -, - CF 2 O -, - OCF 2 - may be replaced by, ^{M Q} is trans -1,4-cyclohexylene group, 1,4-phenylene group or a single bond is represented.)
^RQ represents a straight-chain alkyl group or a branched-chain alkyl group having 1 to 22 carbon atoms, and one or two or more CH ₂ groups in the alkyl group are —O—so that oxygen atoms are not directly adjacent to each other. -, - CH = CH -, - CO -, - OCO -, - COO -, - C≡C -, - CF 2 O -, - OCF 2 - may be substituted with, but 1 to 10 carbon atoms Linear alkyl group, linear alkoxy group, linear alkyl group in which one CH ₂ group is substituted with —OCO— or COO—, branched alkyl group, branched alkoxy group, one CH ₂ group is —OCO— or A branched alkyl group substituted by COO- is preferred, a linear alkyl group having 1 to 20 carbon atoms, a linear alkyl group in which one CH ₂ group is substituted by -OCO- or COO-, a branched alkyl group A branched alkoxy group, one CH A branched alkyl group in which _two groups are substituted with -OCO- or COO- is more preferable. ^MQ represents a trans-1,4-cyclohexylene group, a 1,4-phenylene group or a single bond, and a trans-1,4-cyclohexylene group or a 1,4-phenylene group is preferable.

  More specifically, the compound represented by the general formula (Q) is preferably a compound represented by the following general formula (Qa) to general formula (Qd).

In the formula, R ^Q1 is preferably a linear or branched alkyl group having 1 to 10 carbon atoms, R ^Q2 is preferably a linear or branched alkyl group having 1 to 20 carbon atoms, and R ^Q3 is A linear alkyl group having 1 to 8 carbon atoms, a branched alkyl group, a linear alkoxy group or a branched alkoxy group is preferable, and L ^Q is preferably a linear alkylene group or a branched alkylene group having 1 to 8 carbon atoms. . Of the compounds represented by general formula (Qa) to general formula (Qd), compounds represented by general formula (Qc) and general formula (Qd) are more preferable.

  In the liquid crystal composition of the present invention, the compound represented by formula (Q) preferably contains one or two compounds, more preferably contains 1 to 5 compounds, and the content is 0.001. To 1%, 0.001 to 0.1% is more preferable, and 0.001 to 0.05% is particularly preferable.

  The liquid crystal composition containing the polymerizable compound of the present invention is provided with a liquid crystal alignment ability by polymerization of the polymerizable compound contained therein by ultraviolet irradiation, and the amount of transmitted light can be increased by utilizing the birefringence of the composition. Used for controlling liquid crystal display elements.

  The liquid crystal display device using the liquid crystal composition of the present invention is useful for achieving both high-speed response and suppression of display failure, and is particularly useful for a liquid crystal display device for active matrix driving, including VA mode, PSVA mode, It can be applied to a liquid crystal display element for PSA mode, IPS mode, FFS mode or ECB mode. As the liquid crystal display element, AM-LCD (active matrix liquid crystal display element), TN (nematic liquid crystal display element), STN-LCD (super twisted nematic liquid crystal display element), OCB-LCD, IPS-LCD (in-plane switching liquid crystal display) Element) and FFS-LSD (fringe field switching liquid crystal display element), it is particularly useful for AM-LCD, and can be used for transmissive or reflective liquid crystal display elements.

  More specifically, the liquid crystal display element according to the present invention includes a first substrate and a second substrate disposed opposite to each other, and a book filled between the first substrate and the second substrate. A liquid crystal layer containing the liquid crystal composition of the invention; a common electrode on the first substrate; a plurality of gate bus lines and data bus lines arranged in a matrix; the gate bus lines and the data bus lines; A thin film transistor provided at an intersection, an electrode layer driven by the thin film transistor and having a pixel electrode for each pixel that forms an electric field substantially parallel to the substrate, the liquid crystal layer, and the first substrate And a liquid crystal display element having an alignment film layer for inducing homogeneous alignment formed between the second substrate and the second substrate. In other words, the liquid crystal display element according to the present invention includes a first polarizing plate, a first substrate, a common electrode, an insulating layer, an electrode layer including the thin film transistor, a (first) alignment film, A configuration in which a liquid crystal layer containing a liquid crystal composition, a (second) alignment film, a color filter, a second substrate, and a second polarizing plate are sequentially laminated is preferable.

  The liquid crystal composition having positive dielectric anisotropy of the present invention can obtain a significantly low viscosity and a high elastic constant Kavg, has good solubility at low temperatures, and has a specific resistance and a voltage holding ratio of Since the change caused by light is extremely small, the practicality of the product is high, and an IPS type or FFS type liquid crystal display element using the product can achieve a high-speed response.

  The two substrates of the liquid crystal cell used in the liquid crystal display element can be made of a transparent material having flexibility such as glass or plastic, and one of them can be an opaque material such as silicon. A transparent substrate having a transparent electrode layer can be obtained, for example, by sputtering indium tin oxide (ITO) on a transparent substrate such as a glass plate.

  The color filter provided on the first substrate and the second substrate can be prepared by, for example, a pigment dispersion method, a printing method, an electrodeposition method, or a dyeing method. A method for producing a color filter by the pigment dispersion method will be described as an example. A curable coloring composition for a color filter is applied onto the transparent substrate, subjected to patterning treatment, and cured by heating or light irradiation. By performing this process for each of the three colors red, green, and blue, a pixel portion for a color filter can be created. In addition, a pixel electrode provided with an active element such as a TFT, a thin film diode, or a metal insulator metal specific resistance element may be provided on the substrate.

  The said board | substrate is made to oppose so that a transparent electrode layer may become an inner side. In that case, you may adjust the space | interval of a board | substrate through a spacer. At this time, it is preferable to adjust so that the thickness of the light control layer obtained may be set to 1-100 micrometers. More preferably, the thickness is 1.5 to 10 μm. When a polarizing plate is used, it is preferable to adjust the product of the refractive index anisotropy Δn of the liquid crystal and the cell thickness d so that the contrast is maximized. In addition, when there are two polarizing plates, the polarizing axis of each polarizing plate can be adjusted so that the viewing angle and contrast are good. Furthermore, a retardation film for widening the viewing angle can also be used. Examples of the spacer include columnar spacers made of glass particles, plastic particles, alumina particles, a photoresist material, and the like. Thereafter, a sealant such as an epoxy thermosetting composition is screen-printed on the substrates with a liquid crystal inlet provided, the substrates are bonded together, and heated to thermally cure the sealant.

  As a method for sandwiching the polymerizable compound-containing composition between two substrates, a normal vacuum injection method or an ODF method can be used. However, in the present invention, it can be suitably used for a display element manufactured using the ODF method. In the ODF liquid crystal display device manufacturing process, a sealant such as epoxy photothermal curing is drawn on a backplane or frontplane substrate using a dispenser in a closed-loop bank shape, and then removed. A liquid crystal display element can be manufactured by bonding a front plane and a back plane after dropping a predetermined amount of the liquid crystal composition in the air. The liquid crystal composition of the present invention can be preferably used because the liquid crystal composition can be stably dropped in the ODF process.

  EXAMPLES The present invention will be described in further detail with reference to examples below, but the present invention is not limited to these examples. Further, “%” in the liquid crystal compositions of the following examples and comparative examples means “mass%”.

  In the examples, the measured characteristics are as follows.

T _NI / ° C .: Nematic phase-isotropic liquid phase transition temperature (° C.)
Δn: Refractive index anisotropy at 298K Δε: Dielectric anisotropy at 298K η / mPa · s: Viscosity at 293K (mPa · s)
γ ₁ / mPa · s: Rotational viscosity at 298K (mPa · s)
Vth: Voltage at which the transmittance changes by 10% when liquid crystal is sealed in a TN cell having a thickness of 6 microns and voltage is applied to a 298K crossed Nicol polarizing plate.
K11, K22, K33: Elastic constants at 298K. Kaverage means their average value. K11 and K33 use a measuring device EC-1 (manufactured by Toyo Technica), enclose liquid crystal in a horizontal alignment cell having a cell gap of 30 μm, and change the capacitance (C) obtained by applying 30 → 0 volts (V). This was calculated by fitting the curve (CV curve). K22 was calculated by using the following equation (1) by obtaining the threshold voltage (Vc) by fitting the same liquid crystal in a 20 μm TN cell and fitting a CV curve obtained by applying a voltage in the same manner.

In the above formula (1), ε ₀ represents the dielectric constant of vacuum.

VHR:
Voltage retention rate (%) at 333 K under conditions of frequency 60 Hz and applied voltage 5 V After heat resistance test VHR: TEG (test element group) for encapsulating liquid crystal composition sample in a thermostatic chamber at 130 ° C. For 1 hour and then measured under the same conditions as in the VHR measurement method described above.

Burn-in:
The burn-in evaluation of the liquid crystal display element is performed until the afterimage of the fixed pattern reaches an unacceptable afterimage level when displaying the predetermined fixed pattern in the display area for an arbitrary test time and then displaying the entire screen uniformly. The test time was measured.
1) The test time referred to here indicates the display time of the fixed pattern, and the longer this time is, the more the afterimage is suppressed and the higher the performance.
2) The unacceptable afterimage level is a level at which an afterimage that is rejected in the shipment acceptance / rejection determination is observed. Example) Sample A: 1000 hours Sample B: 500 hours Sample C: 200 hours Sample D: 100 hours Performance is A>B>C> D.

Drop marks:
The evaluation of the drop marks of the liquid crystal display device was performed by visual observation of the drop marks that appeared white when the entire surface was displayed in black by the following five-step evaluation.

5: No dripping trace (excellent)
4: Acceptable level (good) with very few drops
3: There is a slight drop mark, borderline level of pass / fail judgment (possible with conditions)
2: Unacceptable level with dripping marks (impossible)
1: There is a drip mark and is quite inferior (bad)
Process suitability:
Process compatibility is determined by dropping 50pL of liquid crystal at a time, "0-100 times, 101-200 times, 201-300 times, ..." 100 times each time using a constant volume metering pump in the ODF process. The mass of the liquid crystal for each 100 drops was measured and evaluated by the number of drops at which the mass variation reached a size that could not be adapted to the ODF process.
It can be said that the more the number of times of dropping, the more stable the dropping over a long time, and the higher the process compatibility.
Example) Sample A: 95,000 times Sample B: 40000 times Sample C: 100,000 times Sample D: 10,000 times The performance is C>A>B> D.

Low temperature storage (LTS):
For storage stability evaluation at low temperature, after preparing the liquid crystal composition, 0.5 g of the liquid crystal composition was weighed into a 1 mL sample bottle, and stored in a temperature controlled test tank at -25 ° C for 240 hours. The occurrence of precipitates from the liquid crystal composition was observed and the test time when the precipitates were observed was measured. It can be said that the longer the test time until precipitation occurs, the better the storage stability at low temperatures.

Solubility at low temperature:
In order to evaluate the solubility at a low temperature, after preparing the liquid crystal composition, 1 g of the liquid crystal composition was weighed in a 2 mL sample bottle, and the following operation state “−20 ° C. (1 hour) in a temperature-controlled test tank. Hold) → Temperature rise (0.1 ° C./min)→0° C. (hold for 1 hour) → Temperature rise (0.1 ° C./min)→20° C. (hold for 1 hour) → Temperature drop (−0.1 ° C.) / Min) → 0 ° C. (holding for 1 hour) → temperature drop (−0.1 ° C./min)→−20° C. ”, continuously changing the temperature, and visually observing the precipitates from the liquid crystal composition Generation | occurrence | production was observed and the test time when a deposit was observed was measured.
The longer the test time, the more stably the liquid crystal phase is maintained for a long time, and the solubility at low temperature is better. Example) Sample A: 72 hours Sample B: 600 hours Sample C: 384 hours Sample D: 1440 hours Performance is D>B>C> A.

Volatility / contamination of production equipment:
Evaluation of the volatility of the liquid crystal material was performed by observing the operating state of the vacuum stirring and defoaming mixer using a stroboscope and visually observing the foaming of the liquid crystal material. Specifically, 0.8 kg of the liquid crystal composition is put into a special container of a 2.0 L vacuum stirring defoaming mixer, and the vacuum stirring is performed at a revolution speed of 15 S-1 and a rotation speed of 7.5 S-1 under 4 kPa degassing. The defoaming mixer was operated and the time until foaming started was measured.

The longer the time until foaming starts, the more difficult it is to volatilize and the lower the possibility of contaminating the production equipment, indicating high performance. Example) Sample A: 200 seconds Sample B: 45 seconds Sample C: 60 seconds Sample D: 15 seconds The performance is A>C>B> D.
In the examples, the following abbreviations are used for the description of compounds.
(Ring structure)

(Side chain structure and linking structure)
-F -F fluorine atom F- -F fluorine atom -n -C _n H _{2n + 1} linear alkyl group having n carbon atoms n-C _n H _{2n + 1} -linear alkyl group having n carbon atoms -On -OC _n H _{2n + 1} carbon atoms of n straight chain alkoxy group nO- C _n H _2n + 1 O- carbon atoms of n straight chain alkoxy group -V -CH = CH ₂
V- CH ₂ = CH-
-V1 -CH = CH-CH ₃
1V- CH ₃ -CH = CH-
_{-2V -CH 2 -CH 2 -CH = CH} 3
_{V2- CH 3 = CH-CH 2} -CH 2 -
_{-2V1 -CH 2 -CH 2 -CH = CH} -CH 3
_{1V2- CH 3 -CH = CH-CH} 2 -CH 2
(Linking group)
-CF2O- -CFFO-
-OCF2- -O-CF ₂ -
-1O- -CH ₂ -O-
-O1- -O-CH ₂ -
-COO- -COO-
Liquid crystal compositions having the following compositions (Comparative Example 1 (the liquid crystal composition of Example 3 of Patent Document 1) and Examples 1 to 5) were prepared, and their physical properties were measured. The results are shown in Table 1 below.

  It can be seen that the liquid crystal composition of Example 1 has comparable Δε and γ1 as compared with Comparative Example 1, but has a higher nematic transition temperature (TNI) and Δn. The liquid crystal composition of Example 2 has the same nematic transition temperature (TNI), Δε, Δn as those of Comparative Example 1, but it can be seen that γ1 is greatly improved. Moreover, it turns out that the same effect is acquired also in Examples 3-5 which changed the structure of the component (i) or component (ii) of this invention. Since the liquid crystal compositions described in these examples have a small γ1, they are suitable for IPS, FFS mode, etc. that place importance on transmittance.

  Liquid crystal compositions (Comparative Examples 2 and 3 and Examples 6 to 10) having the following compositions were prepared and measured for physical properties. The results are shown in Table 2 below.

  Comparative Example 2 is a liquid crystal compound containing a compound having an alkenyl group only on one side instead of the compound of general formula (i). On the other hand, Example 6 is a liquid crystal composition containing a compound of the general formula (i) instead of a compound having an alkenyl group on one side. Comparing the two, it can be seen that the liquid crystal composition of Example 6 is greatly improved in γ1 although Tni is lowered. Therefore, Comparative Example 3 was prepared based on Comparative Example 2 and adjusted so that the nematic transition temperature was about the same as Example 6. Compared to Comparative Example 3, Example 6 has a lower γ1 and the K33 is increased. It can be seen that Example 7 in which some compounds were substituted based on Example 6 has further improved γ1 and higher K11 and K22. Examples 8-10 have γ1 that is comparable or slightly improved as in Comparative Example 3, with higher Δn and higher elastic constant Kavg. Since the liquid crystal compositions of these examples have a relatively high Δε and transition temperature and a high Kavg, they are particularly suitable as components for high-contrast IPS / FFS displays for mobile use. It is known that the response speed of the liquid crystal composition is improved when K33 is increased.

Table 3 shows the measurement results of optical characteristics in Comparative Example 3, Example 6, and Example 7 in the FFS mode cell. For measurement, an FFS substrate with a transparent IZO comb electrode (line width: 3 microns, electrode spacing: 4 microns) and an insulating layer (SiN _x ) of 500 microns was used, and an alignment film (SE-5811, manufactured by Nissan Chemical Industries) was applied and rubbed. In addition, it was used by being bonded to a counter substrate so that the cell gap was 3.5 microns. The alignment film was rubbed in the direction of 5 ° with respect to the longitudinal direction of the transparent comb electrode.
The meaning of each item in the table is as follows.
V100: Applied voltage that maximizes the transmittance.
TON: Liquid crystal response time until the transmittance reaches 90% when V100 is applied from the 0V state.
TOFF: Liquid crystal response time until the transmittance reaches 10% when the voltage is turned off from the V100 state.

  Compared to Comparative Example 3, it can be seen that Example 6 has an improved response time. Further, it can be seen that in Example 7 in which the configuration of the component (ii) is changed, the response time is further increased.

  Liquid crystal compositions (Examples 11 to 14) having the following compositions were prepared and measured for physical properties. The results are shown in Table 4 below.

  Since the liquid crystal compositions of these examples have relatively high Δn and low γ1, they are suitable as constituent members for high-speed response narrow gap liquid crystal display elements. In addition, since these liquid crystal compositions have a transition temperature suitable for indoor displays and have a relatively high Δε, the width between the comb electrodes can be widened in the IPS mode and the FFS mode. It is suitable as a structural member of an indoor display with excellent rate.

  Liquid crystal compositions (Examples 15 to 18) having the following compositions were prepared, and their physical properties were measured. The results are shown in Table 5 below.

  Since the liquid crystal compositions of these examples have a high Δn and an extremely low γ1, they are very suitable as a component for a narrow gap liquid crystal display device for high-speed response. In addition, these liquid crystal compositions have a transition temperature suitable for indoor displays and can improve the transmittance in the IPS mode and the FFS mode with a small Δε, so that a high-speed response indoor display with excellent transmittance is achieved. It is suitable as a constituent member.

  Liquid crystal compositions (Examples 19 to 22) having the following compositions were prepared and measured for physical properties. The results are shown in Table 6 below.

  Since the liquid crystal compositions of these examples have a very wide liquid crystal temperature range and a low γ1, they are suitable as components for outdoor displays and in-vehicle displays.

  From the above results, the liquid crystal composition having improved γ1, Δn, Δε, and nematic transition temperature can be provided without impairing the low temperature storage stability of the liquid crystal composition by the constitution of the present invention. Moreover, the performance can be improved by using this for a liquid crystal display element. Providing a liquid crystal composition having further improved physical property values by appropriately selecting the structures of components (ii) to (iii) of the present invention, and a liquid crystal display device having improved performance more effectively using the liquid crystal composition Is possible.

  The configurations and combinations thereof in the embodiments described above are examples, and additions, omissions, substitutions, and other modifications can be made without departing from the spirit of the present invention. Further, the present invention is not limited by each embodiment, and is limited only by the scope of the claims.

  The liquid crystal composition according to the present invention is widely applicable to the fields of liquid crystal display elements and liquid crystal displays.

Claims (8)

Formula (i):

(In the general formula (i), R ^ia and R ^ib are each independently an alkenyl group having 2 to 8 carbon atoms,
Ring A ⁱ¹ and Ring B ⁱ¹ are the following groups (a) and (b):
(A) 1,4-cyclohexylene group (one —CH ₂ — present in this group or two or more non-adjacent —CH ₂ — may be replaced by —O—).
(B) 1,4-phenylene group (one -CH = present in this group or two or more non-adjacent -CH = may be replaced by -N =).
Each of the above groups (b) may be independently substituted with a cyano group, a fluorine atom or a chlorine atom,
m ⁱ¹ is an integer of 0 to 3. ) One or more compounds represented by
General formula (ii):

(In the general formula (ii), R ⁱⁱ¹ represents an alkyl group having 1 to 8 carbon atoms or an alkenyl group having 2 to 10 carbon atoms, and one of the groups or two or more non-adjacent —CH Each ₂ -may be independently substituted by -C≡C-, -O-, -CO-, -COO- or -OCO-, and may be one or two or more non-adjacent groups in the group. Each hydrogen atom may be independently substituted with a fluorine atom,
K ⁱⁱ⁰ , K ⁱⁱ¹ and K ⁱⁱ² are each independently the following groups (a) and (b):
(A) 1,4-cyclohexylene group (one —CH ₂ — present in this group or two or more non-adjacent —CH ₂ — may be replaced by —O— or S—). .)
(B) 1,4-phenylene group (one -CH = present in this group or two or more non-adjacent -CH = may be replaced by -N =).
Each of the above groups (b) may be independently substituted with a cyano group, a fluorine atom or a chlorine atom,
Z ⁱⁱ¹ , Z ⁱⁱ² and Z ⁱⁱ³ are each independently a single bond, —CH ₂ CH ₂ —, — (CH ₂ ) ₄ —, —OCH ₂ —, —CH ₂ O—, —OCF ₂ —, —CF ₂ O—, —CH ₂ CH ₂ CF ₂ O—, ^—COO— , ^—OCO— or C≡C—, and when n ^ik is 0, one of Z ⁱⁱ¹ and Z ⁱⁱ² is -OCH ₂ - or _-CH 2 O-a ^represents, if ^{n IIK} is 1 or ^more, any one of Z ^{ii1, Z ii2} and ^{Z ii3} are, _{-OCH 2} - or _-CH 2 O-a represents ,
n ^ik independently represents 0, 1, 2, 3 or 4 and when n ^iiik is 2 or more, Z ⁱⁱ³ and K ⁱⁱ² may be the same or different,
X ⁱⁱ³ and X ⁱⁱ⁴ each independently represent a hydrogen atom or a fluorine atom,
Y ⁱⁱ¹ each independently represents a compound represented by a fluorine atom, a cyano group, a trifluoromethyl group, a fluoromethoxy group, a difluoromethoxy group, a trifluoromethoxy group, or a 2,2,2-trifluoroethyl group, and a general formula (Iii):

(In the general formula (iii), R ⁱⁱⁱ¹ represents an alkyl group having 1 to 8 carbon atoms, and one or two or more non-adjacent —CH ₂ — in the alkyl group are each independently —CH _2. ═CH—, —C≡C—, —O—, —CO—, —COO— or OCO— may be substituted,
n ⁱⁱⁱ¹ represents 0, 1, 2, 3 or 4;
A ⁱⁱⁱ¹ and A ⁱⁱⁱ² are each independently
(A) 1,4-cyclohexylene group (the one present in the group -CH ₂ - or 2 nonadjacent or more -CH ₂ - may be replaced by -O- or S- .) And (b) 1,4-phenylene group (one —CH═ present in this group or two or more —CH═ not adjacent to each other may be replaced by —N═).
Each of the groups (a) and (b) may be independently substituted with a cyano group, a fluorine atom or a chlorine atom,
Z ⁱⁱⁱ¹ and Z ⁱⁱⁱ² are each independently a single bond, —CH ₂ CH ₂ —, — (CH ₂ ) ₄ —, —OCF ₂ —, —CF ₂ O—, —COO—, —OCO— or C≡. C-
when n ⁱⁱⁱ¹ is 2, 3 or 4 and a plurality of A ⁱⁱⁱ² are present, they may be the same or different; n ⁱⁱⁱ¹ is 2, 3 or 4 and a plurality of Z ⁱⁱⁱ¹ is present If they are the same or different,
X ⁱⁱⁱ¹ and X ⁱⁱⁱ³ each independently represent a hydrogen atom, a chlorine atom or a fluorine atom,
Y ⁱⁱⁱ² represents a hydrogen atom, a fluorine atom, a chlorine atom, a cyano group, a trifluoromethyl group, a fluoromethoxy group, a difluoromethoxy group, a trifluoromethoxy group, or a 2,2,2-trifluoroethyl group. A liquid crystal composition comprising at least one or more selected from the group consisting of compounds represented by: Formula (L):

(In the formula, R ^L1 and R ^L2 each independently represent an alkyl group having 1 to 8 carbon atoms, and one or two or more non-adjacent —CH ₂ — in the alkyl group are each independently And may be substituted by -CH = CH-, -C≡C-, -O-, -CO-, -COO- or OCO-,
n ^L1 represents 0, 1, 2 or 3,
A ^L1 , A ^L2 and A ^L3 are each independently
(A) 1,4-cyclohexylene group (this is present in the group one -CH ₂ - or non-adjacent two or more -CH ₂ - may be replaced by -O-.)
(B) a 1,4-phenylene group (one —CH═ present in the group or two or more non-adjacent —CH═ may be replaced by —N═) and (c) (C) Naphthalene-2,6-diyl group, 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or decahydronaphthalene-2,6-diyl group (naphthalene-2,6-diyl group or One —CH═ present in the 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or two or more non-adjacent —CH═ may be replaced by —N═. )
Represents a group selected from the group consisting of: and each of the groups (a), (b) and (c) may be independently substituted with a cyano group, a fluorine atom or a chlorine atom,
Z ^L1 and Z ^L2 are each independently a single bond, —CH ₂ CH ₂ —, — (CH ₂ ) ₄ —, —OCH ₂ —, —CH ₂ O—, —COO—, —OCO—, —OCF. _2- , —CF ₂ O—, —CH═N—N═CH—, —CH═CH—, —CF═CF— or C≡C—
When n ^L1 is 2 or 3, and a plurality of A ^L2s are present, they may be the same or different, and when n ^L1 is 2 or 3 and a plurality of Z ^L3 are present, they are May be the same or different, but excludes compounds represented by the compound represented by formula (i). The liquid crystal composition according to claim 1, comprising one or more compounds selected from compounds represented by: General formula (M):

(In the general formula (M), R ^M1 represents an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or an alkenyl having 2 to 8 carbon atoms. Represents an oxy group, and one or more hydrogen atoms in the alkyl group, alkenyl group, alkoxy group or alkenyloxy group may be substituted with a fluorine atom, and the alkyl group, alkenyl group, alkoxy group or alkenyloxy group And one or more non-adjacent —CH ₂ — therein are each independently replaced by —CH═CH—, —C≡C—, —O—, —CO—, —COO— or OCO—. You may,
PM represents 0, 1, 2, 3 or 4;
C ^M1 and C ^M2 are each independently
(D) 1,4-cyclohexylene group (the one present in the group -CH ₂ - or 2 nonadjacent or more -CH ₂ - may be replaced by -O- or S- .) And (e) 1,4-phenylene group (one —CH═ present in this group or two or more —CH═ not adjacent to each other may be replaced by —N═).
Represents a group selected from the group consisting of: The above groups (d) and (e) may be each independently substituted with a cyano group, a fluorine atom or a chlorine atom,
K ^M1 and K ^M2 are each independently a single bond, —CH ₂ CH ₂ —, — (CH ₂ ) ₄ —, —OCF ₂ —, —CF ₂ O—, —COO—, —OCO— or C≡C. -
When PM is 2, 3 or 4 and there are a plurality of K ^M1 , they may be the same or different, and when PM is 2, 3 or 4 and there are a plurality of C ^M2 They may be the same or different,
X ^M1 and X ^M3 each independently represent a hydrogen atom, a chlorine atom or a fluorine atom,
X ^M2 represents a hydrogen atom, a fluorine atom, a chlorine atom, a cyano group, a trifluoromethyl group, a fluoromethoxy group, a difluoromethoxy group, a trifluoromethoxy group, or a 2,2,2-trifluoroethyl group. However, the compound represented by general formula (i), general formula (ii), and general formula (L) is excluded. The liquid crystal composition according to claim 1, further comprising a compound represented by: The compound represented by the general formula (ii) has the following partial structure in the structure:

(The black spot in the formula represents a carbon atom in the ring structure to which the partial structure is bonded.)
The liquid crystal composition according to claim 1, comprising:   The liquid crystal composition according to claim 1, which contains a polymerizable compound.   The liquid crystal display element using the liquid-crystal composition of any one of Claim 1 to 5.   An active matrix drive liquid crystal display element using the liquid crystal composition according to claim 1.   A VA mode, PSA mode, VA-IPS mode, IPS mode, FFS mode or ECB mode liquid crystal display element using the liquid crystal composition according to claim 1.