JPH1087835A - Liquid crystal polymer and liquid crystal composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a liquid crystal polymer having pyrimidine liquid crystal groups and being applicable to various optical elements. SOLUTION: This polymer comprises repeating units each of which is represented by formula I (wherein R<1> is formula II (wherein C* is an asymmetrical carbon atom; and R<5> is a 3C or higher alkylene); X is formula III (wherein Q is H, hydroxyl, a halogen or methyl); R<2> is formula IV (wherein k>2; Z is methyl or a halogen); R<3> is -(CH2 )m -O- or- (CH2 )n -(wherein m and n are each >2); R<4> is -O-Cp H2p+1 , or -Cq H2q+1 (wherein p and q are each >2); Y is formula V (wherein T is H, hydroxyl, a halogen or nitrile); a is 0 or an integer; and b and c are each an integer). This can be produced by effecting the addition reaction of a poly(methylhydrosiloxane) with an unsaturation- terminated highly spontaneously polarizable liquid crystal component and a lowly viscous liquid cyrstal component in the presence of a platinum catalyst.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystalline polymer applicable to various optical elements and a liquid crystal composition containing the same.

[0002]

2. Description of the Related Art Ferroelectric liquid crystals which respond to an electric field at a high speed and have excellent characteristics in view characteristics and contrast are attracting attention as materials for realizing high-performance liquid crystal display devices. However, this liquid crystal is difficult to control a cell gap in a large area, and has problems such as weakness in bending and impact resistance, so that it is difficult to adapt to a large area display and a curved surface display. Therefore, as one of attempts to improve this point, it has been considered that a ferroelectric liquid crystal is polymerized to impart moldability and shape retention (Japanese Patent Application Laid-Open No. 55-21479). However, the liquid crystalline polymer having acrylic acid as the main chain disclosed in this publication has a high glass transition temperature, and therefore has a high liquid crystal temperature, so that its application is limited. Therefore, a liquid crystalline polymer having a polysiloxane as a main chain has been proposed (JP-B-63-47759). As a result, although the temperature characteristics of the liquid crystal were improved, the response speed that can be used practically could not be obtained only by changing the main chain to polysiloxane. By the way, since the response time of the ferroelectric liquid crystal is proportional to the viscosity and inversely proportional to the spontaneous polarization and the applied electric field, two methods of lowering the viscosity and increasing the spontaneous polarization are considered to increase the speed. Then, the present inventors have developed a liquid crystalline polymer based on the latter method (Japanese Patent Laid-Open No. 4-134).
No. 050). As a result, a liquid crystalline polymer having a side chain structure having two chiral groups, a chiral alkanoyl group and a chiral group derived from lactic acid, at both ends of a core can have a spontaneous polarization of up to 600 nC / cm ^2. all right.
However, these liquid crystalline polymers have large spontaneous polarization,
Do not show a chiral smectic C phase around room temperature;
Another problem is that the viscosity is high.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to improve the temperature characteristics and viscosity of a liquid crystalline polymer having two chiral groups, thereby exhibiting a liquid crystal phase in a wide temperature range including room temperature, and exhibiting a response. An object of the present invention is to provide a liquid crystalline polymer or a liquid crystal composition thereof having a short time.

[0004]

SUMMARY OF THE INVENTION In summary, the first invention of the present invention relates to a liquid crystalline polymer, and has a repeating unit represented by the following general formula (Chemical Formula 1). It is characterized by.

[0005]

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[R ¹ :

[0007]

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(C ^* is an asymmetric carbon, R ⁵ is an alkylene group having 3 or more carbon atoms) X:

[0009]

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(Q represents any one of hydrogen, a hydroxyl group, a halogen, and a methyl group) R ² :

[0011]

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(C ^* is an asymmetric carbon, k is an integer of 2 or more, Z
Represents a methyl group or a _{^{halogen) R 3: - (CH 2}} ) m -O-, - (CH 2) n - (m, n is an integer of 2 or _{^{more) R 4: -O-C p}} H 2p _{+1, -C q H 2q + 1} (p, q denotes an integer of 2 or more) Y:

[0013]

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(T represents any one of hydrogen, hydroxyl group, halogen, and nitrile group) a: represents zero or a positive number b, c: represents a positive number The second invention of the present invention relates to a liquid crystal composition , Characterized by containing at least one component of the liquid crystalline polymer of the first invention.

The present inventors have conducted intensive studies, and as a result, according to the present invention, if a specific pyrimidine-based liquid crystal group is copolymerized with a liquid crystal group having two chiral groups, phase separation is reduced and temperature characteristics are reduced. And that the viscosity can be improved.
That is, the present invention provides a ferroelectric liquid crystal copolymer represented by the general formula (Formula 1) and a liquid crystal composition containing the same.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically described below. The present invention relates to a liquid crystalline polymer represented by the above general formula (Formula 1). Further, in order to improve each characteristic including the temperature characteristic, it is effective to further mix with several kinds of liquid crystalline polymers or low molecular liquid crystals and use it as a liquid crystal composition. On the other hand, as the molecular weight of this liquid crystalline polymer increases, the viscosity increases and the response time decreases,
For application to various optical elements, the number average molecular weight is 70
A range of 0 to 40,000, preferably 700 to 20,000 has been found to be suitable. In the formula, R ⁵ determines the length of the spacer connecting the liquid crystal exhibiting part and the main chain part. If the length of the spacer is short, it tends to be a nematic phase, and if the length is long, it tends to be a smectic phase. Therefore, it is preferable that the length is long to some extent. Conversely, if the length is too long, crystallization of the portion is caused, and the liquid crystal temperature range becomes narrow. Excessive flexibility is not desirable because it reduces the liquid crystallinity. From these, R
⁵ is suitably an alkylene group having 3 to 12 carbon atoms. The length k of the terminal group is related to the liquid crystal temperature range, and has an optimum value between 2 and 12 carbon atoms. Also, m, n,
Both p and q affect the temperature characteristics of the liquid crystal. It has an optimum value of the temperature characteristic between 2 and 12 when it is made into a copolymer. The liquid crystalline polymer represented by the general formula (Formula 1) has, for example, a structure having the following repeating unit, and its characteristics can be adjusted by changing its copolymerization ratio.

[0017]

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[0018]

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[0019]

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[0020]

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[0021]

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[0022]

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[0023]

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[0024]

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[0025]

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The liquid crystalline polymer of the present invention can adjust the viscosity and spontaneous polarization because the introduction ratio of the liquid crystal side chain having a low polarity can be freely changed. Since the pyrimidine-based liquid crystal group, which is a low-polarity liquid crystal group, can improve the viscosity even in a small amount, the viscosity can be reduced without significantly lowering the spontaneous polarization, and as a result, the effect of improving the response time is high. Further, it was found that the temperature range of the chiral smectic C (SmC ^* ) phase was expanded to a lower temperature side by the copolymerization, and was shown in a range including room temperature. In addition, other liquid crystalline polymer,
Alternatively, a low-molecular liquid crystal is mixed to improve the bistability, threshold characteristics, response time, helical pitch, and the like, and a liquid crystal composition excellent in electro-optical characteristics and easily formed can be obtained. The composition ratio of the liquid crystal polymer to be mixed is set so that the effect of the low molecular liquid crystal can be obtained without impairing the impact resistance and good alignment property of the liquid crystal polymer, and that the melting point does not appear in the operating temperature range. In order to satisfy the above, it is more desirable to set the range of 20 to 95%. The liquid crystalline polymer composition thus obtained can be used as a material for various optoelectronic devices such as a display, an optical switch, and an optical modulator.

[Production Method of Compound] The liquid crystalline polymer represented by the general formula (Chemical Formula 1) has a poly (methylhydrosiloxane), which is a reactive polymer, having an unsaturated bond at its terminal by using a platinum catalyst. It can be produced by adding a spontaneously polarized liquid crystalline component and a low viscosity liquid crystalline component. The liquid crystal composition can be prepared by mixing and stirring a sample as a dichloromethane solution, and then removing the solvent by heating and reducing the pressure.

[0028]

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples. The identity of the product was carried out by proton nuclear magnetic resonance spectrum ⁽¹ H-NMR) and infrared absorption spectrum (IR). The molecular weight of the liquid crystal polymer is determined by gel permeation chromatography (GP
Calibrated by C). The liquid crystal phase and the phase transition temperature were determined by differential scanning calorimetry and observation with a polarizing microscope. For the measurement of each electro-optical characteristic, a liquid crystalline polymer or a liquid crystalline polymer composition is melted on a glass substrate with ITO on which a 10 μm spacer is scattered, sandwiched between another glass substrate, and oriented by shear. To produce a cell.
An electric field was applied to the cell, and spontaneous polarization was measured using a triangular wave method. The response time is measured by applying an electric field (10 V / μm) to the same cell as when measuring the spontaneous polarization, and averaging the time required for a change in transmitted light amount of 0 to 90% and the time required for 100 to 10%. Time.

Example 1 A method for synthesizing a liquid crystalline polymer represented by the following formula (Formula 15) is described below.

[0030]

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5- (7-octenyloxy) -2- (4
Synthesis of (octyloxyphenyl) pyrimidine (1) 5-ethoxy-2- (4-hydroxyphenyl)
Synthesis of pyrimidine Sodium methoxide 38.9g methanol 400m
40 g of p-hydroxybenzamidine hydrochloride and 62.7 g of 1,3-bis (dimethylamino) -2-ethoxytrimethinium perchlorate were added to the 1 solution, and the mixture was heated under reflux for 5 hours. After the reaction, the reaction mixture was cooled to room temperature, pure water and acetic acid were added, and the precipitated crystals were collected by filtration to give 5-ethoxy-2- (4-.
41 g of (hydroxyphenyl) pyrimidine were obtained. (2) Synthesis of 5-ethoxy-2- (4-octyloxyphenyl) pyrimidine 41 g of 5-ethoxy-2- (4-hydroxyphenyl) pyrimidine was dissolved in 350 ml of ethanol, and 11.5 g of potassium hydroxide and octyl bromide were dissolved. 36.7 g,
The mixture was heated under reflux for 3 hours. Next, excess ethanol was distilled off to make the reaction solution about 50 ml. Toluene and pure water were added to extract the desired product, which was further washed with a sodium hydroxide solution, and further washed with water. The residue obtained by distilling toluene and low boiling compounds from the organic layer was recrystallized from ethanol to give 5-
48 g of ethoxy-2- (4-octyloxyphenyl) pyrimidine were obtained. (3) Synthesis of 5-hydroxy-2- (4-octyloxyphenyl) pyrimidine 48 g of 5-ethoxy-2- (4-octyloxyphenyl) pyrimidine was dissolved in 300 ml of diethylene glycol, and 58 g of sodium hydroxide was added. And stirred for 3 hours. After cooling to room temperature, add pure water and acetic acid,
The precipitated crystals were separated by filtration. Further purification by recrystallization from ethanol gave 30 g of 5-hydroxy-2- (4-octyloxyphenyl) pyrimidine. (4) Synthesis of 5- (7-octenyloxy) -2- (4-octyloxyphenyl) pyrimidine 5-hydroxy-2- (4-octyloxyphenyl)
30 g of pyrimidine is dissolved in 150 ml of ethanol, and 6 g of potassium hydroxide and 19.5 g of 8-octene-1 bromide are dissolved.
Was added and heated to reflux for 6 hours. After cooling to room temperature, the organic layer separated by adding toluene and pure water was washed with a 2N aqueous sodium hydroxide solution, and the water washing was repeated. The residue obtained by distilling off toluene from the organic layer was recrystallized from ethanol to obtain 12 g of 5- (7-octenyloxy) -2- (4-octyloxyphenyl) pyrimidine. Compound I
The R and NMR spectral data are as follows: IR (cm ^-1 ): 3047, 2923, 2854, 1607, 1443, 128
8, 1250, 1240 ¹ H-NMR (CDCl ₃ / TMS, ppm): 8.4 (2
H, s), 8.3 (2H, d), 7.0 (2H, d), 5.7-5.9 (1H, m), 4.
9 to 5.1 (2H, m), 4.1 (2H, t), 4.0 (2H, t), 2.0 to 2.2 (2
H, m), 1.7 to 1.9 (4H, m), 1.2 to 1.6 (16H, m), 0.9
(3H, t)

Synthesis of (S) -4- (1-oxo-2-methyloctyl) phenyl (R) -4- [4- {2- (7-octenyloxy) propanoyloxy} phenyl] benzoate (1) ) Synthesis of silver oxide (Ag ₂ O) 100 g of silver nitrate was dissolved in 500 ml of pure water. As soon as 500 ml of a 5% aqueous sodium hydroxide solution was added to this solution, a black precipitate of silver oxide was formed. After stirring for 1 hour, the precipitate was sufficiently washed with pure water. The obtained black solid was dried at 50 ° C. under reduced pressure at 50 ° C. for 2 days or more in the presence of phosphorus pentoxide to obtain silver oxide. (2) Synthesis of methyl (R) -2- (7-octenyloxy) propanoate 20 g of 8-iodo-1-octene and 11.6 g of methyl lactate were placed in a three-necked flask equipped with a mechanical stirrer. . While stirring this well, 12.9 g of the silver oxide prepared in (1) was added dropwise over 1 hour. After stirring at room temperature for 24 hours, the mixture was refluxed gently for 3 hours. After cooling the reaction solution, ether was added and suction filtration was performed. After concentration, purification was performed by distillation under reduced pressure to obtain a colorless and transparent liquid. Yield: 9.16 g (52%), bp: 85 ° C./10 mmH
g (3) Synthesis of (R) -2- (7-octenyloxy) propanoic acid 9.0 g of methyl (R) -2- (7-octenyloxy) propanoate and 5% aqueous sodium hydroxide solution 44 .1
g was stirred vigorously day and night at room temperature. Dilute sulfuric acid was added to the colorless and transparent reaction solution to make it acidic (pH was 4 or less), extracted with diethyl ether, and washed with pure water. Dried over sodium sulfate overnight. After filtration, the mixture was concentrated and further dried under reduced pressure. Yield: 6.61 g (79%) (4) Synthesis of (R) -2- (7-octenyloxy) propane chloride 5.0 g of (R) -2- (7-octenyloxy) propane The acid, 5.9 g of thionyl chloride and 2 drops of dimethylformamide were refluxed in 60 ml of dry dichloromethane for 3 hours. The solvent was removed under reduced pressure to obtain a colorless transparent liquid. Yield: 5.4 g (98%) (5) Synthesis of (R) -4- [2- (7-octenyloxy) propanoyloxy] -1,1'-biphenyl-4'-carboxylic acid 4- 5.35 g of hydroxyphenylbenzoic acid and 19.75 g of pyridine were dissolved in 100 ml of carbon tetrachloride. (R) -2 was dissolved in 100 ml of carbon tetrachloride in this solution.
-(7-octenyloxy) propanoic acid chloride 5.46
g was added dropwise at room temperature. After stirring overnight at room temperature,
The resulting white precipitate was filtered. The precipitate separated by filtration with diethyl ether was washed, and the washed solution was added to the filtrate, followed by washing with diluted hydrochloric acid and pure water. Dried over sodium sulfate overnight and concentrated to give crude product. Furthermore, white crystals were obtained by recrystallization with ethanol. Yield: 5.18 g (52%) (6) Synthesis of (S) -4- (1-oxo-2-methyloctyl) phenol 8.25 g of anisole was dissolved in 100 ml of anhydrous 1,2-dichloroethane, and 0 ° C. And cooled. 9. In this solution
2 g of aluminum chloride were added little by little. Further, 9.2 g of (S)-(+)-2-methylbutyric chloride was added to 50
A solution dissolved in ml of 1,2-dichloroethane was added dropwise. After completion of the dropwise addition, the mixture was stirred at room temperature for 1 hour. afterwards,
An additional 9.2 g of ground aluminum chloride was added and refluxed for 2 hours. After cooling to room temperature, the mixture was poured on ice containing 10 ml of hydrochloric acid and extracted with chloroform. The extracted organic layer was washed with sodium hydrogen carbonate and water, and then dried. After concentration, the crude product was purified by silica gel chromatography to obtain (S) -4- (1-oxo-2-methyloctyl) phenol. (7) Synthesis of (S) -4- (1-oxo-2-methyloctyl) phenyl (R) -4- [4- {2- (7-octenyloxy) propanoyloxy} phenyl] benzoate 1.77 g of (S) -4- (1-oxo-2-methyloctyl) phenol obtained by the reaction and (R) -4- [2
-(7-octenyloxy) propanoyloxy]-
3.0 g of 1,1'-biphenyl-4'-carboxylic acid was dissolved in 100 ml of anhydrous dichloromethane, 0.04 g of 4-dimethylaminopyridine and 1.87 g of dicyclohexylcarbodiimide were added, and the mixture was stirred overnight at room temperature. The generated precipitate was separated by filtration, and the crude product obtained by evaporating the solvent was purified by silica gel chromatography, and further recrystallized from ethanol to obtain a monomer (S) -4-.
(1-oxo-2-methyloctyl) phenyl (R)
4- [4- {2- (7-octenyloxy) propanoyloxy} phenyl] benzoate was obtained. yield:
IR and NMR spectral data of 2.6 g (57%) compound are as ^{follows: IR (cm -1): 2932,1732,1680,1204,1192,1072} 1 H-NMR (CDCl 3 / TMS, ppm ): 8.30 (2
H, d), 8.06 (2H, d), 7.74 (2H, d), 7.72 (2H, d),
7.39 (2H, d), 7.24 (2H, d), 5.7-5.9 (1H, m), 4.9
To 5.1 (2H, m), 4.1 to 4.3 (1H, m), 3.6 to 3.8 (1H, m),
3.4-3.6 (2H, m), 0.7-2.2 (29H, m)

Synthesis of Liquid Crystalline Polymer After drying with sodium, 50 ml of distilled benzene becomes a polymer precursor and becomes a liquid crystal group having two chiral groups. (S) -4- (1-oxo-2-methyloctyl) Phenyl (R) -4- [4- {2- (7-octenyloxy) propanoyloxy} phenyl] benzoate
085 mmol and 0.015 mmol of 5-octenyloxy-2- (4-octyloxyphenyl) pyrimidine serving as a non-chiral liquid crystal group in a total of 0.15 mmol;
mmol of poly (methylhydrogensiloxane) (X
F40-A7603, degree of polymerization: about 10, manufactured by Toshiba Silicone Co., Ltd.), 0.5 ml of a 0.2 wt% dicyclopentadienylplatinum (II) chloride in dichloromethane solution as a catalyst was added, and the mixture was refluxed for 20 hours. After completion of the reaction, the solvent was removed by distillation under reduced pressure, followed by purification by gel permeation chromatography to separate the remaining polymer precursor and the liquid crystalline polymer. Furthermore, it dried at 40 degreeC under reduced pressure and obtained the target liquid crystalline polymer. The phase transition behavior of this liquid crystalline polymer was as follows. G10SmX65SmC ^* 112SmA130Iso (° C.) (G: glassy state, SmX: unidentified smectic phase,
(SmC ^* ; chiral smectic C phase, SmA: smectic A phase, Iso: isotropic phase) The spontaneous polarization of this liquid crystalline polymer was 340 nC / cm ² at 10 ° C. below the maximum temperature of the SmC ^* phase. Compared to Comparative Example 1 described below, this liquid crystalline polymer has a SmC ^* temperature range of a single polymer composed of only two chiral groups, and both the upper and lower limits of the temperature range are shifted to a lower temperature of 8 ° C., but the spontaneous polarization is sufficient. And can be a fast response material. Further, as described in Example 6 below, the composition can lower the temperature and viscosity of the Sm ^* phase.

Example 2 In order to obtain the following liquid crystalline polymer, the ratio of the precursor of the liquid crystal group having two chiral groups to the precursor of the non-chiral liquid crystal group was set to 7: 3 in Example 1, and the following formula (Formula 16) was obtained. Was synthesized.

[0035]

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The phase transition behavior of this copolymer was as follows. G10SmX48SmC ^* 102SmA123Iso (° C.) The spontaneous polarization of this liquid crystalline polymer was 270 nC / cm ² at 10 ° C. below the SmC ^* phase upper limit temperature. This liquid crystalline polymer has a SmC ^* temperature range of a single polymer composed of only two chiral groups as compared with Comparative Example 1, and the upper limit of the temperature range is 18% ^.
Although the lower limit is shifted to 25 ° C. and the lower limit is 25 ° C., the spontaneous polarization is sufficiently large and the material can be a high-speed response material. Further, as described in Example 6, the composition can lower the temperature and viscosity of the Sm ^* phase.

Example 3 A liquid crystal polymer represented by the following formula (Formula 17) was synthesized by setting the ratio of the precursor of the liquid crystal group having two chiral groups and the precursor of the non-chiral liquid crystal group to 5: 5 in Example 1. did.

[0038]

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As for the phase transition behavior of this liquid crystalline polymer, SmC ^* appeared in a wide range including room temperature as follows. G-7 SmC ^* 106 SmA110 Iso (° C.) The spontaneous polarization of this liquid crystalline polymer was 170 nC / cm ² at 10 ° C. below the SmC ^* phase upper limit temperature. However, the response time was 350 msec at 30.degree.

Example 4 In Example 1, the ratio of the precursor of the liquid crystal group having two chiral groups to the precursor of the non-chiral liquid crystal group was set to 2.5: 7.5, and the liquid crystallinity represented by the following formula (Formula 18) was obtained. A polymer was synthesized.

[0041]

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As to the phase transition behavior of this liquid crystalline polymer, SmC ^* appeared in a wide range including room temperature as follows. G-15 SmC ^* 95 Iso (° C.) The spontaneous polarization of this liquid crystalline polymer was 47 nC / cm ² at 10 ° C. below the maximum temperature of the SmC ^* phase.

Example 5 In Example 1, 8-brominated octene-1 was replaced with 10-brominated octene.
A precursor of a non-chiral liquid crystal group is synthesized using decene bromide-1, and the ratio of a liquid crystal group having two chiral groups to a precursor of a non-chiral liquid crystal group is set to 5: 5, and the following formula (Formula 1)
A liquid crystalline polymer represented by 9) was synthesized.

[0044]

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The phase transition behavior of this liquid crystalline polymer was as follows. G-9 SmC ^* 115 SmA 130 Iso (° C.) The spontaneous polarization of this liquid crystalline polymer was 150 nC / cm ² at 10 ° C. below the SmC ^* phase upper limit temperature.

Example 6 A low-molecular liquid crystal composition 40 containing benzoate ester having the following phase transition temperature was added to 60% of the liquid crystalline polymer synthesized in Example 3.
% To prepare a liquid crystal composition. Cr38 SmC ^* 64 N82 Iso (° C.) (Cr: crystalline phase) This liquid crystal composition had little phase separation, and the phase transition behavior was as follows. G-25 SmC ^* 77 SmA 98 Iso (° C.) The spontaneous polarization of this liquid crystalline polymer composition was 44 nC / cm ² at 10 ° C. below the SmC ^* phase upper limit temperature.
The response time was 7 msec at 30 ° C. By using such a composition, the SmC ^* phase temperature can be lowered to a low temperature side, and a high-speed response can be achieved by lowering the viscosity. Therefore, even the liquid crystalline polymers of Examples 1 and 2 in which the SmC ^* phase temperature range is higher than room temperature can be similarly improved by the composition.

Comparative Example 1 A liquid crystalline polymer having a structure represented by the following formula (Formula 20) was synthesized from only the liquid crystal group having two chiral groups in Example 1.

[0048]

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The phase transition behavior of this liquid crystalline polymer was as follows. G14SmX73SmC ^* 120SmA146Iso (° C.) As described above, the single polymer has a higher smectic phase on the lower temperature side than the SmC ^* phase, so that SmC ^* near room temperature ^.
No indication was given and the application was limited.

It is apparent from Examples 1 to 6 that the SmC ^* phase temperature can be lowered and the viscosity can be lowered by copolymerizing a pyrimidine-based liquid crystal group. Therefore, the same effects can be obtained by copolymerizing a pyrimidine-based liquid crystal group in Formulas (7) to (14). In particular, those in which fluorine is introduced into the benzene ring are more effective in lowering the viscosity.

[0051]

The liquid crystalline polymer and its composition of the present invention exhibit a wide liquid crystal temperature range including room temperature, and have a short response time to an electric field, so that they are extremely useful as materials for various devices in the field of optoelectronics. Useful.

Claims (2)

[Claims] 1. A liquid crystalline polymer having a repeating unit represented by the following general formula (Formula 1). Embedded image [R ¹ : embedded image (C ^* represents an asymmetric carbon, and R ⁵ represents an alkylene group having 3 or more carbon atoms.) X: (Q represents any one of hydrogen, a hydroxyl group, a halogen, and a methyl group.) R ² : (C ^* is asymmetric carbon, k is an integer of 2 or more, Z is a methyl group or a _{^{halogen) R 3: - (CH 2}} ) m -O-, - (CH 2) n - (m, n is 2 more an _{^{integer) R 4: -O-C p}} H 2p + 1, -C q H 2q + 1 (p, q denotes an integer of 2 or more) Y: embedded image (T represents any one of hydrogen, a hydroxyl group, a halogen, and a nitrile group) a: represents zero or a positive number b, c: represents a positive number 2. A liquid crystal composition comprising at least one component of the liquid crystalline polymer according to claim 1.