JP7128850B2 - Polymerizable liquid crystal composition, optically anisotropic film, optical film, polarizing plate and image display device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a polymerizable liquid crystal composition, an optically anisotropic film, an optical film, a polarizing plate and an image display device.

A polymerizable compound that exhibits reverse wavelength dispersion enables accurate conversion of the polarization state in a wide wavelength range, and can make the retardation film thinner to exhibit large refractive index anisotropy. It has been extensively studied because of its characteristics.
In addition, as a polymerizable compound exhibiting reverse wavelength dispersion, a T-type molecular design guideline is generally taken, shortening the wavelength of the long axis of the molecule and lengthening the wavelength of the short axis located in the center of the molecule. compounds have been proposed (see, for example, Patent Documents 1 to 3).

On the other hand, a retardation film using a polymerizable liquid crystal compound is generally produced using a coating process, and there is a problem of how to realize a uniform, defect-free, large-area thin film. Since continuous production of uniform, defect-free films using industrially available coating equipment requires advanced technology, efforts have been made to solve this problem by adding leveling agents, etc. ( See, for example, Patent Documents 4 and 5).

JP 2010-031223 A WO2014/010325 JP 2016-081035 A JP-A-11-148080 Japanese Patent Application Laid-Open No. 2004-198511

The present inventors have found that a polymerizable compound exhibiting reverse wavelength dispersion is more difficult to control the orientation of liquid crystal molecules than a liquid crystal compound exhibiting normal wavelength dispersion.
Further, in recent years, the resolution of OLED (Organic Light Emitting Diode) display elements has progressed, and the qualitative and frequency tolerance for unevenness and defects has narrowed year by year.

Accordingly, the present invention provides a polymerizable liquid crystal composition that has reverse wavelength dispersion and can provide an optically anisotropic film with excellent uniformity without unevenness or alignment defects, and an optically anisotropic film using the same. An object of the present invention is to provide an optical film and a polarizing plate.

As a result of intensive studies aimed at achieving the above object, the present inventors found that the above object can be overcome by using a combination of a polymerizable compound exhibiting reverse wavelength dispersion and a specific fluoroaliphatic group-containing polymer. I completed the present invention.
That is, the inventors have found that the above object can be achieved by the following configuration.

[1] A polymerizable liquid crystal compound exhibiting reverse wavelength dispersion, and a fluoroaliphatic group-containing polymer containing a structural unit represented by formula (A-1) described later and a structural unit derived from a fluoroaliphatic group-containing monomer A and a fluoroaliphatic group-containing polymer B represented by the formula (B-0) described later, a polymerizable liquid crystal composition.
[2] The polymerizable liquid crystal composition according to [1], wherein the fluoroaliphatic group-containing polymer B is a polymer represented by formula (B) described below.
[3] The fluoroaliphatic group-containing polymer A according to [1] or [2], wherein X in formula (A-1) described later has a structural unit represented by a substituted or unsubstituted naphthyl group. A polymerizable liquid crystal composition.
[4] Any one of [1] to [3], wherein in the fluoroaliphatic group-containing polymer B, the repeating unit represented by M is a repeating unit represented by formula (B-3) described later. polymerizable liquid crystal composition.
[5] The polymerizability according to any one of [1] to [4], wherein the mass ratio of the fluoroaliphatic group-containing polymer A to the fluoroaliphatic group-containing polymer B is 8:2 to 4:6. liquid crystal composition.
[6] The polymerizable liquid crystal composition according to any one of [1] to [5], wherein the polymerizable liquid crystal compound is a polymerizable liquid crystal compound represented by formula (1) described below.
[7] The polymerizable liquid crystal composition according to [6], wherein Ar ¹ in formula (1) described later represents a group represented by formula (Ar-1) or (Ar-2) above.
[8] The polymerizable liquid crystal composition according to any one of [1] to [7], further comprising a polymerization initiator.
[9] An optically anisotropic film formed from the polymerizable liquid crystal composition according to any one of [1] to [8].
[10] The optically anisotropic film of [9], wherein the liquid crystal molecules are fixed in a homogeneous orientation.
[11] An optical film comprising the optically anisotropic film of [9] or [10].
[12] The optical film of [11], comprising another optically anisotropic film different from the optically anisotropic film.
[13] A polarizing plate comprising the optically anisotropic film of [9] or [10] and a polarizer.
[14] An image display device comprising the optical film of [11] or [12] or the polarizing plate of [13].

According to the present invention, a polymerizable liquid crystal composition that has reverse wavelength dispersion and can provide an optically anisotropic film with excellent uniformity without unevenness or alignment defects, and an optically anisotropic film using the composition, An optical film as well as a polarizing plate can be provided.

FIG. 1A is a schematic cross-sectional view showing an example of the optically anisotropic film of the present invention. FIG. 1B is a schematic cross-sectional view showing another example of the optically anisotropic film of the present invention. FIG. 2 is a schematic cross-sectional view showing one example of the polarizing plate of the present invention. FIG. 3 is a diagram showing the relationship between the absorption axis of the polarizer and the in-plane slow axis of the optically anisotropic layer in the polarizing plate of the invention. FIG. 4 is a schematic cross-sectional view showing an example of an organic electroluminescence display device, which is one aspect of the image display device of the present invention.

The present invention will be described in detail below.
The description of the constituent elements described below may be made based on representative embodiments of the present invention, but the present invention is not limited to such embodiments.
In this specification, a numerical range represented by "-" means a range including the numerical values before and after "-" as lower and upper limits.
In addition, in the present specification, each component may be a substance corresponding to each component either singly or in combination of two or more. Here, when two or more substances are used in combination for each component, the content of the component refers to the total content of the substances used in combination unless otherwise specified.
Further, in this specification, the bonding direction of the divalent group (e.g., —O—CO—) indicated is not particularly limited unless the bonding position is specified. When D ¹ in 1) is —CO—O—, if the position bonded to the Ar ¹ side is *1 and the position bonded to the G ¹ side is *2, D ¹ is *1 -CO-O-*2 or *1-O-CO-*2.
Also, in this specification, the angles (e.g., angles such as "90°") and their relationships (e.g., "perpendicular", "parallel" and "crossing at 45°") belong to the present invention. It shall include the margin of error that is acceptable in the technical field. For example, it means that it is within the range of a strict angle of ±10°, and the error from the strict angle is preferably 5° or less, more preferably 3° or less.

[Polymerizable liquid crystal composition]
The polymerizable liquid crystal composition of the present invention comprises a polymerizable liquid crystal compound exhibiting reverse wavelength dispersion, a structural unit represented by formula (A-1) described later, and a structural unit derived from a fluoroaliphatic group-containing monomer. and a fluoroaliphatic group-containing polymer B represented by formula (B-0) described later.

In the present invention, as described above, by using the fluoroaliphatic group-containing polymers A and B in combination with the polymerizable liquid crystal compound exhibiting reverse wavelength dispersion, the polymer has reverse wavelength dispersion and is free from unevenness and alignment defects. An optically anisotropic film can be formed. In the present invention, the optically anisotropic film free from unevenness and orientation defects and the optically anisotropic film excellent in uniformity have substantially the same meaning.
Although this is not clear in detail, the present inventor presumes as follows.
That is, the fluoroaliphatic group-containing polymer A and the fluoroaliphatic group-containing polymer B described above each have their own functions. Although the detailed mechanism is not clear, by combining two fluoroaliphatic group-containing polymers with different functions, it is possible to homogenize the coating surface and the molecules inside the coating at each stage of the solvent drying process after coating. It is considered that the stabilization of the orientation state is highly realized.
Each component of the polymerizable liquid crystal composition of the present invention will be described in detail below.

[Polymerizable compound exhibiting reverse wavelength dispersion]
The polymerizable compound exhibiting reverse wavelength dispersion contained in the polymerizable liquid crystal composition of the present invention is a compound whose optical anisotropy per thickness increases according to the measurement wavelength in a monodomain homogeneous alignment state. means
A monodomain homogeneous alignment state can be obtained by providing a gap between two glass substrates provided with a horizontal alignment film and encapsulating a target polymerizable liquid crystal compound in the gap to develop a liquid crystal phase. When the target compound is a vertically aligned polymerizable liquid crystal compound, the horizontal alignment may be replaced with the vertical alignment, and the refractive index anisotropy in the thickness direction may be measured instead.

As described above, most polymerizable liquid crystal compounds exhibiting reverse wavelength dispersion are based on the T-type molecular design guidelines. It is a compound with a longer wavelength. However, within the scope of the present invention, it may have other structures such as a molecular structure in which two H-shapes or T-shapes are linked.

In the present invention, the polymerizable liquid crystal compound exhibiting reverse wavelength dispersion is preferably a polymerizable liquid crystal compound represented by the following formula (1) (hereinafter referred to as "polymerizable liquid crystal compound (1)").
L ¹ -SP ¹ -(E ³ -A ¹ ) _m -E ¹ -G ¹ -D ¹ -Ar ¹ -D ² -G ² -E ² -(A ² -E ⁴ ) _n -SP ² -L ² ... (1)

In the above formula (1), D ¹ , D ² , E ¹ , E ² , E ³ and E ⁴ are each independently a single bond, -CO-O-, -C(=S)O-, -CR ¹ R ² -, -CR ¹ R ² -CR ³ R ⁴ -, -O-CR ¹ R ² -, -CR ¹ R ² -O-CR ³ R ⁴ -, -CO-O-CR ¹ R ² - , -O-CO-CR ¹ R ² -, -CR ¹ R ² -O-CO-CR ³ R ⁴ -, -CR ¹ R ² -CO-O-CR ³ R ⁴ -, -NR ¹ -CR ² represents R ³ — or —CO—NR ¹ —. R ¹ , R ² , R ³ and R ⁴ each independently represent a hydrogen atom, a fluorine atom, or an alkyl group having 1 to 4 carbon atoms.
In the above formula (1), G ¹ and G ² each independently represent a divalent alicyclic hydrocarbon group having 5 to 8 carbon atoms which may have a substituent, and an alicyclic One or more —CH ₂ — constituting a hydrocarbon group may be substituted with —O—, —S— or —NH—.
In the above formula (1), A ¹ and A ² are each independently a divalent aromatic hydrocarbon group having 6 to 12 carbon atoms which may have a substituent, or represents a _divalent alicyclic hydrocarbon group having 5 to 8 carbon atoms which may be It may be substituted with NH-.
In the above formula (1), SP ¹ and SP ² are each independently a single bond, a linear or branched alkylene group having 1 to 12 carbon atoms, or a linear chain having 1 to 12 carbon atoms. or a divalent linkage in which one or more of —CH ₂ — constituting a branched alkylene group are substituted with —O—, —S—, —NH—, —N(Q)—, or —CO— group, and Q represents a substituent.
In formula (1) above, L ¹ and L ² each independently represent a monovalent organic group, and at least one of L ¹ and L ² represents a polymerizable group. However, when Ar ¹ is an aromatic ring represented by the following formula (Ar-3), at least one of L ¹ and L ² and L ³ and L ⁴ in the following formula (Ar-3) is polymerizable represents a group.
Further, in the above formula (1), m represents an integer of 0 to 2, and when m is 2, the plurality of E ³ may be the same or different, and the plurality of A ¹ is , may be the same or different.
Further, in the above formula (1), n represents an integer of 0 to 2, and when n is 2, the plurality of E ⁴ may be the same or different, and the plurality of A ² is , may be the same or different.

In the above formula (1), D ¹ , D ² , E ¹ , E ² , E ³ and E ⁴ are preferably any of -CO-, -O- and -CO-O- .

In the above formula (1), the divalent alicyclic hydrocarbon group having 5 to 8 carbon atoms represented by G ¹ and G ² is preferably a 5- or 6-membered ring. Also, the alicyclic hydrocarbon group may be saturated or unsaturated, but a saturated alicyclic hydrocarbon group is preferred. As the divalent alicyclic hydrocarbon group represented by G ¹ and G ² , for example, the description in paragraph [0078] of JP-A-2012-21068 can be referred to, the contents of which are incorporated herein. .
Among these, a cyclohexylene group (cyclohexane ring) is preferred, a 1,4-cyclohexylene group is more preferred, and a trans-1,4-cyclohexylene group is even more preferred.
Further, in the above formula (1), the substituents which the divalent alicyclic hydrocarbon group having 5 to 8 carbon atoms represented by G ¹ and G ² may have include the following formula (Ar-1 ) and the same substituents that Y ¹ may have.

In the above formula (1), the divalent aromatic hydrocarbon group having 6 to 12 carbon atoms represented by A ¹ and A ² includes a 1,2-phenylene group, a 1,3-phenylene group and a 1,4-phenylene group. group, 1,4-naphthylene group, 1,5-naphthylene group, 2,6-naphthylene group, etc. Among them, 1,4-phenylene group is preferred, and trans-1,4-phenylene group is more preferred. .
Examples of the divalent alicyclic hydrocarbon group having 5 to 8 carbon atoms represented by A ¹ and A ² include the same groups as described for G ¹ and G ² in formula (1) above. , is preferably a cyclohexylene group (cyclohexane ring), more preferably a 1,4-cyclohexylene group, and still more preferably a trans-1,4-cyclohexylene group.

In the above formula (1), examples of linear or branched alkylene groups having 1 to 12 carbon atoms represented by SP ¹ and SP ² include methylene group, ethylene group, propylene group, butylene group, pentylene group and hexylene. group, methylhexylene group, heptylene group, and the like. In SP ¹ and SP ² , as described above, one or more of —CH ₂ — constituting a linear or branched alkylene group having 1 to 12 carbon atoms is —O—, —S—, or —NH. -, -N(Q)-, or -CO- may be a divalent linking group substituted with -CO-, and the substituent represented by Q is Y in the formula (Ar-1) described later. The substituents which ¹ may have may be mentioned.

In the above formula (1), examples of monovalent organic groups represented by L ¹ and L ² include an alkyl group, an aryl group, and a heteroaryl group. Alkyl groups may be linear, branched or cyclic, but are preferably linear. The number of carbon atoms in the alkyl group is preferably 1-30, more preferably 1-20, even more preferably 1-10. Also, the aryl group may be monocyclic or polycyclic, but is preferably monocyclic. The number of carbon atoms in the aryl group is preferably 6-25, more preferably 6-10. Also, the heteroaryl group may be monocyclic or polycyclic. The number of heteroatoms constituting the heteroaryl group is preferably 1-3. A heteroatom constituting the heteroaryl group is preferably a nitrogen atom, a sulfur atom, or an oxygen atom. The heteroaryl group preferably has 6 to 18 carbon atoms, more preferably 6 to 12 carbon atoms. In addition, the alkyl group, aryl group and heteroaryl group may be unsubstituted or may have a substituent. Examples of the substituent include the same substituents that Y ¹ in formula (Ar-1) described later may have.

In formula (1), the polymerizable group represented by at least one of L ¹ and L ² is not particularly limited, but is preferably a polymerizable group capable of radical polymerization or cationic polymerization.
As the radically polymerizable group, generally known radically polymerizable groups can be used, and acryloyl groups and methacryloyl groups can be mentioned as suitable groups. In this case, an acryloyl group is generally known to have a high polymerization rate, and an acryloyl group is preferred from the viewpoint of improving productivity, but a methacryloyl group can also be used as the polymerizable group.
As the cationically polymerizable group, generally known cationically polymerizable groups can be used. Specifically, alicyclic ether groups, cyclic acetal groups, cyclic lactone groups, cyclic thioether groups, spiroorthoester groups, and , a vinyloxy group, and the like. Among them, an alicyclic ether group or a vinyloxy group is preferable, and an epoxy group, an oxetanyl group or a vinyloxy group is particularly preferable.
Examples of particularly preferred polymerizable groups include the following.

In the above formula (1), both L ¹ and L ² in the above formula (1) are preferably polymerizable groups, such as an acryloyl group or a methacryloyl group, for the reason that wet heat durability is better. is more preferable.

On the other hand, in the above formula (1), Ar ¹ represents any aromatic ring selected from the group consisting of groups represented by the following formulas (Ar-1) to (Ar-5). In formulas (Ar-1) to (Ar-5) below, * represents the bonding position with D ¹ or D ² in formula (I) above.

Here, in the above formula (Ar-1), Q ¹ represents N or CH, Q ² represents -S-, -O-, or -N(R ⁵ )-, and R ⁵ is represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, and Y ¹ is an optionally substituted aromatic hydrocarbon group having 6 to 12 carbon atoms or an aromatic heteroaromatic group having 3 to 12 carbon atoms represents a cyclic group.
Specific examples of the alkyl group having 1 to 6 carbon atoms represented by R ⁵ include methyl group, ethyl group, propyl group, isopropyl group, n-butyl group, isobutyl group, sec-butyl group and tert-butyl. groups, n-pentyl groups, and n-hexyl groups.
Examples of the aromatic hydrocarbon group having 6 to 12 carbon atoms represented by Y ¹ include aryl groups such as phenyl group, 2,6-diethylphenyl group and naphthyl group.
Examples of the aromatic heterocyclic group having 3 to 12 carbon atoms represented by Y ¹ include heteroaryl groups such as thienyl group, thiazolyl group, furyl group and pyridyl group.

In the above formula (Ar-1), examples of the substituent that Y ¹ may have include an alkyl group, an alkoxy group, and a halogen atom.
The alkyl group is preferably, for example, a linear, branched or cyclic alkyl group having 1 to 18 carbon atoms, and an alkyl group having 1 to 8 carbon atoms (eg, methyl group, ethyl group, propyl group, isopropyl group, , n-butyl group, isobutyl group, sec-butyl group, t-butyl group, cyclohexyl group, etc.), more preferably an alkyl group having 1 to 4 carbon atoms, and a methyl group or an ethyl group. is particularly preferred.
As the alkoxy group, for example, an alkoxy group having 1 to 18 carbon atoms is preferable, and an alkoxy group having 1 to 8 carbon atoms (eg, methoxy group, ethoxy group, n-butoxy group, methoxyethoxy group, etc.) is more preferable, and carbon An alkoxy group of number 1 to 4 is more preferred, and a methoxy group or an ethoxy group is particularly preferred.
Examples of halogen atoms include fluorine, chlorine, bromine, and iodine atoms, with fluorine and chlorine atoms being preferred.

In the above formulas (Ar-1) to (Ar-7), Z ¹ , Z ² and Z ³ are each independently a hydrogen atom, a monovalent aliphatic hydrocarbon group having 1 to 20 carbon atoms, a carbon a monovalent alicyclic hydrocarbon group having 3 to 20 carbon atoms, a monovalent aromatic hydrocarbon group having 6 to 20 carbon atoms, a halogen atom, a cyano group, a nitro group, -OR ⁶ , -NR ⁷ R ⁸ , or , —SR ⁹ , R ⁶ to R ⁹ each independently represent a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, and Z ¹ and Z ² may combine with each other to form an aromatic ring. good.
The monovalent aliphatic hydrocarbon group having 1 to 20 carbon atoms is preferably an alkyl group having 1 to 15 carbon atoms, more preferably an alkyl group having 1 to 8 carbon atoms, specifically a methyl group (Me). , ethyl group, isopropyl group, tert-pentyl group (1,1-dimethylpropyl group), tert-butyl group (tBu), 1,1-dimethyl-3,3-dimethyl-butyl group are more preferred, methyl group, Ethyl group and tert-butyl group are particularly preferred.
Examples of monovalent alicyclic hydrocarbon groups having 3 to 20 carbon atoms include cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, cyclodecyl, methylcyclohexyl and ethylcyclohexyl. monocyclic saturated hydrocarbon groups such as groups; Monocyclic unsaturated hydrocarbon groups such as diene; bicyclo[2.2.1]heptyl group, bicyclo[2.2.2]octyl group, tricyclo[5.2.1.0 ^2,6 ]decyl group, tricyclo[3.3.1.1 ^3,7 ]decyl group, tetracyclo[6.2.1.1 ^3,6 . 0 ^2,7 ]dodecyl group, polycyclic saturated hydrocarbon group such as adamantyl group; and the like.
Specific examples of the monovalent aromatic hydrocarbon group having 6 to 20 carbon atoms include phenyl group, 2,6-diethylphenyl group, naphthyl group, biphenyl group and the like, and 6 to 12 carbon atoms. is preferably an aryl group (particularly a phenyl group).
The halogen atom includes, for example, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, etc. Among them, a fluorine atom, a chlorine atom and a bromine atom are preferable.
On the other hand, specific examples of alkyl groups having 1 to 6 carbon atoms represented by R ⁶ to R ⁹ include methyl group, ethyl group, propyl group, isopropyl group, n-butyl group, isobutyl group and sec-butyl group. tert-butyl, n-pentyl, and n-hexyl groups.

In the above formulas (Ar-2) and (Ar-3), A ³ and A ⁴ are each independently from -O-, -N(R ¹⁰ )-, -S-, and -CO- represents a group selected from the group consisting of R ¹⁰ represents a hydrogen atom or a substituent;
Examples of the substituent represented by R ¹⁰ include the same substituents that Y ¹ in the above formula (Ar-1) may have.

In the above formula (Ar-2), X represents a hydrogen atom or a nonmetallic atom of Groups 14 to 16 which may be bonded to a substituent.
Further, the non-metallic atoms of groups 14 to 16 represented by X include, for example, an oxygen atom, a sulfur atom, a nitrogen atom having a substituent, and a carbon atom having a substituent. is, for example, an alkyl group, an alkoxy group, an alkyl-substituted alkoxy group, a cyclic alkyl group, an aryl group (e.g., a phenyl group, a naphthyl group, etc.), a cyano group, an amino group, a nitro group, an alkylcarbonyl group, a sulfo group, a hydroxyl group, etc. are mentioned.

In the above formula (Ar-3), D ³ and D ⁴ are each independently a single bond, -CO-O-, -C(=S)O-, -CR ¹ R ² -, -CR ¹ R ² -CR ³ R ⁴ -, -O-CR ^{1 R 2 -, -CR 1 R 2 -O-CR 3 R 4 -, -CO-O-CR 1 R 2 - , -O - CO -} CR ¹ R ² -, -CR ¹ R ² -O-CO-CR ³ R ⁴ -, -CR ¹ R ² -CO-O-CR ³ R ⁴ -, -NR ¹ -CR ² R ³ -, or -CO —NR ¹ —. R ¹ , R ² , R ³ and R ⁴ each independently represent a hydrogen atom, a fluorine atom, or an alkyl group having 1 to 4 carbon atoms.
Among these, D ³ and D ⁴ are preferably any of -CO-, -O- and -CO-O-.

In the above formula (Ar-3), SP ³ and SP ⁴ are each independently a single bond, a linear or branched C 1-12 alkylene group, or a C 1-12 linear divalent in which one or more —CH ₂ — constituting a chain or branched alkylene group is substituted with —O—, —S—, —NH—, —N(Q)—, or —CO— represents a linking group, and Q represents a substituent. Examples of the substituent include the same substituents that Y ¹ in the above formula (Ar-1) may have.

In the above formula (Ar-3), L ³ and L ⁴ each independently represent a monovalent organic group, and at least one of L ³ and L ⁴ and L ¹ and L ² in the above formula (1) One represents a polymerizable group.
Examples of monovalent organic groups include the same groups as those described for L ¹ and L ² in formula (1) above.
Moreover, as the polymerizable group, the same groups as those described for L ¹ and L ² in the above formula (1) can be mentioned.

Further, in the above formulas (Ar-4) to (Ar-7), Ax has at least one aromatic ring selected from the group consisting of an aromatic hydrocarbon ring and an aromatic heterocyclic ring and has 2 to 30 carbon atoms. represents an organic group.
In the above formulas (Ar-4) to (Ar-7), Ay is a hydrogen atom, an optionally substituted alkyl group having 1 to 12 carbon atoms, or an aromatic hydrocarbon ring and aromatic represents an organic group having 2 to 30 carbon atoms and having at least one aromatic ring selected from the group consisting of heterocyclic rings.
Here, the aromatic rings in Ax and Ay may have a substituent, and Ax and Ay may combine to form a ring.
Q ³ represents a hydrogen atom or an optionally substituted alkyl group having 1 to 6 carbon atoms.
Examples of Ax and Ay include those described in paragraphs [0039] to [0095] of Patent Document 2 (International Publication No. 2014/010325).
Specific examples of the alkyl group having 1 to 6 carbon atoms represented by Q ³ include methyl group, ethyl group, propyl group, isopropyl group, n-butyl group, isobutyl group, sec-butyl group, tert -butyl group, n-pentyl group, n-hexyl group and the like, and the substituents are the same as the substituents that Y ¹ in the above formula (Ar-1) may have. mentioned.

In the present invention, from the viewpoint of film strength after curing, Ar ¹ in the above formula (1) may represent a group represented by any one of the above formulas (Ar-1) to (Ar-5). Preferably, it represents a group represented by the above formula (Ar-1) or (Ar-2).

In the present invention, the polymerizable liquid crystal compound (1) represented by the above formula (1) is used for the reason that the wet heat durability of the optically anisotropic film is improved. wherein both A ¹ and G ¹ are optionally substituted cyclohexylene groups, E ¹ is a single bond, n in the above formula (1) is 1, and A It is preferably a polymerizable liquid crystal compound in which ^{both 2} and G2 are cyclohexylene groups which may have a substituent, and E2 is a ^single bond.

In the present invention, the pKa of the diphenol compound represented by HO—Ar ¹ —OH, which is derived from the structure of Ar ¹ in the above formula (1), is 11 or less for better light resistance. is preferred.
Here, pKa is the value of the acid dissociation constant in a mixed solvent having a volume ratio of tetrahydrofuran (THF)/water=6/4 at 25°C.
As a method for measuring the acid dissociation constant in the present invention, the alkali titration method described in Jikken Kagaku Koza 2nd edition, pages 215 to 217, published by Maruzen Co., Ltd. can be used.

[Other polymerizable liquid crystal compounds]
The polymerizable liquid crystal composition of the present invention may further contain other polymerizable liquid crystal compound in addition to the polymerizable liquid crystal compound exhibiting reverse wavelength dispersion described above. Various known compounds can be used as such a polymerizable liquid crystal compound, and among them, a rod-shaped liquid crystal compound or a discotic liquid crystal compound is preferable. preferable.

Rod-shaped liquid crystal compounds include azomethines, azoxys, cyanobiphenyls, cyanophenyl esters, benzoic acid esters, cyclohexanecarboxylic acid phenyl esters, cyanophenylcyclohexanes, cyano-substituted phenylpyrimidines, alkoxy-substituted phenylpyrimidines, Phenyldioxanes, tolanes and alkenylcyclohexylbenzonitriles are preferably used. For example, it is described in a polymerizable nematic rod-like liquid crystal compound in JP-A-2006-209073.

The other polymerizable liquid crystal compound may be monofunctional or polyfunctional with two or more functionalities. Moreover, you may use multiple types.

[Fluoro-aliphatic group-containing polymer A]
The polymerizable liquid crystal composition of the present invention contains a fluoroaliphatic group-containing polymer A containing a structural unit represented by formula (A-1) described below and a structural unit derived from a fluoroaliphatic group-containing monomer.

The structural unit derived from the fluoroaliphatic group-containing monomer has the effect of controlling the surface energy of the coating film by the action of fluorine to maintain a uniform coating film, and is represented by the formula (A-1) described later. It is believed that the structural unit stabilizes the alignment state by interacting with the polymerizable liquid crystal molecules present near the surface of the coating film, contributing to the formation of an optically anisotropic film free of unevenness and defects. ing.
Each structural unit constituting the fluoroaliphatic group-containing polymer A will be described below.

(1) structural unit represented by formula (A-1)

In formula (A-1) above, Mp represents a trivalent group that constitutes part or all of the polymer main chain.
Moreover, L represents a single bond or a divalent linking group.
Moreover, X represents a substituted or unsubstituted aromatic condensed ring functional group.

In formula (A-1) above, Mp is a trivalent group and constitutes part or all of the main chain of the polymer.
Mp is, for example, a substituted or unsubstituted long-chain or branched alkylene group (e.g., ethylene group, propylene group, methylethylene group, butylene group, hexylene group, etc.), substituted or unsubstituted cyclic alkylene group having 3 to 10 carbon atoms (e.g., cyclopropylene group, cyclobutylene group, cyclohexylene group, etc.), substitution Alternatively, an unsubstituted vinylene group, a substituted or unsubstituted cyclic vinylene group, a substituted or unsubstituted phenylene group, a group containing an oxygen atom (e.g., a group containing an ether group, an acetal group, an ester group, a carbonate group, etc.), nitrogen Groups containing atoms (for example, groups containing amino groups, imino groups, amide groups, urethane groups, ureido groups, imide groups, imidazole groups, oxazole groups, pyrrole groups, anilide groups, maleimide groups, etc.), sulfur atoms groups (e.g., groups containing sulfide groups, sulfone groups, thiophene groups, etc.), groups containing phosphorus atoms (e.g., groups containing phosphine groups, phosphate ester groups, etc.), groups containing silicon atoms (e.g., siloxane groups, etc. A group containing) and a group formed by connecting two or more of these groups, wherein one of the hydrogen atoms contained in these groups is substituted with a -LX group is preferable Listed in
Among these, a substituted or unsubstituted ethylene group, a substituted or unsubstituted methylethylene group, a substituted or unsubstituted cyclohexylene group, a substituted or unsubstituted vinylene group, and Groups one of which is substituted by -L-X groups are preferred, including substituted or unsubstituted ethylene groups, substituted or unsubstituted methylethylene groups, and substituted or unsubstituted vinylene groups. A group in which one of the hydrogen atoms is substituted by an -L-X group is more preferable, and is a substituted or unsubstituted ethylene group, a substituted or unsubstituted methylethylene group, and one of the hydrogen atoms contained in these groups Groups in which one is substituted by -LX groups are more preferred, and Mp-1 and Mp-2, which will be described later, are particularly preferred.

Preferable specific examples of Mp are shown below, but Mp is not limited thereto. In addition, the site represented by * in Mp represents the site linked to L.

Examples of the divalent linking group represented by L in the formula (A-1) include a substituted or unsubstituted alkylene group having 1 to 20 carbon atoms (e.g., a methylene group, an ethylene group, a propylene group, butylene group, isopropylene group, etc.), alkenylene group having 2 to 20 carbon atoms (e.g., vinylene group, butene group, etc.), -O-, -NR ^a1 -, -S-, -PR ^a2 -, -Si ( R ^a3 )(R ^a4 )-, -C(=O)-, -C(=O)O-, -C(=O)NR ^a5 -, -OC(=O)O-, -OC(=O )NR ^a6 -, -NR ^a7 C(=O)NR ^a8 -, -(-O) ₂ CH-, and a divalent linking group selected from groups formed by linking two or more of these It is preferably mentioned.
Here, the above R ^a1 to R ^a8 represent substitutable substituents, for example, a hydrogen atom, a halogen atom, an alkyl group (a monocycloalkyl group containing one or more ring structures, a cycloalkyl group such as a bicycloalkyl group) ), alkenyl groups (including cycloalkenyl groups and bicycloalkenyl groups), alkynyl groups, cyano groups, hydroxyl groups, nitro groups, carboxyl groups, alkoxy groups, silyloxy groups, acyloxy groups, alkoxycarbonyloxy groups, amino groups (anilino group), acylamino group, aminocarbonylamino group, alkoxycarbonylamino group, mercapto group, alkylthio group, sulfamoyl group, sulfo group, alkylsulfinyl group, alkylsulfonyl group, acyl group, alkoxycarbonyl group, imido group, phosphino group , phosphinyl groups, phosphinyloxy groups, phosphinylamino groups and silyl groups, with hydrogen atoms and alkyl groups being preferred.

L in the above formula (A-1) includes -O-, -NR ^a11 - (where R ^a11 represents a hydrogen atom and an aliphatic hydrocarbon group having 1 to 10 carbon atoms), -S-, selected from -C(=O)-, -S(=O) ₂ -, a substituted or unsubstituted alkylene group having 1 to 20 carbon atoms, and a group formed by linking two or more of these It is preferably a divalent linking group, -C(=O)O-, -OC(=O)-, -O-, -OC(=O)O-, -C(=O)NH-, 2 selected from -NHC(=O)-, -C(=O)O(CH ₂ ) _m O-, -(CH ₂ )m-, and a group formed by linking two or more of these A valent linking group is more preferred.
Here, m represents an integer of 1-20. m is preferably 1 to 16, more preferably 2 to 12, still more preferably 2 to 6, in order to appropriately adjust the degree of freedom of X. By appropriately adjusting the degree of freedom of X, the interaction with the liquid crystal to be aligned is increased, the orientation of X can be controlled more effectively, and the average tilt angle can be controlled more effectively.
Moreover, the following linking groups formed by linking two or more of the above linking groups are also preferable. In addition, the site represented by * in L represents the site linked to Mp. In the following formula, m represents an integer of 1 to 20 and has the same meaning as "m" above, and the preferred range is also the same.

Furthermore, when Mp in the above formula (A-1) represents Mp-1 or Mp-2, L is -O-, -NR ^a11 - (R ^a11 is a hydrogen atom, has 1 carbon atom, ~ 10 aliphatic hydrocarbon groups), -S-, -C(=O)-, -S(=O) ₂ -, substituted or unsubstituted alkylene groups having 1 to 20 carbon atoms, and these It is preferably a divalent linking group selected from the group consisting of groups formed by linking two or more, -O-, -C(=O)O-, -C(=O)NH- , and more preferably a divalent linking group selected from the group consisting of a combination of one or more of these and an alkylene group, the above (L-1), (L-2), (L-3) , or (L-6) is more preferable.

The number of rings in the substituted or unsubstituted aromatic condensed ring functional group represented by X in the above formula (A-1) is not particularly limited, but a group in which 2 to 5 rings are condensed preferable.
It may be not only a hydrocarbon-based aromatic condensed ring in which the ring-constituting atoms are only carbon atoms, but also an aromatic condensed ring in which a hetero ring having a heteroatom as a ring-constituting atom is condensed. X is a substituted or unsubstituted indenyl group having 5 to 30 carbon atoms (methylindenyl group, medoxyindenyl group, or heteroatom-substituted indenyl group, e.g., benzofuranyl group, thionaphthenyl group, indolenyl group , indazolyl group, benzimidazolyl group, benzotriazolyl group, 1-pyrazolepyrazinyl group, etc.), substituted or unsubstituted naphthyl group having 6 to 30 carbon atoms (methylnaphthyl group, cyanonaphthyl group, fluoronaphthyl bromonaphthyl or heteroatom-substituted naphthyl, such as quinolyl, isoquinolyl, quinazolyl, quinoxalyl, 6,7-pyridopyridazinyl, benzotetrazinyl, pteryl etc.), a substituted or unsubstituted fluorenyl group having 12 to 30 carbon atoms (2,7-dimethylfluorenyl group, or a heteroatom-substituted fluorenyl group such as a carbazolyl group, a dibenzofuryl group, a dibenzothio phenyl group, etc.), anthryl group (5-methylanthryl group, or heteroatom-substituted anthryl group, such as xanthenyl group, acridinyl group, phenazinyl group, etc.), pyrenyl group, perylenyl group, phenanthrenyl group, etc. is preferred.

In the above formula (A-1), X is preferably a substituted or unsubstituted indenyl group or a substituted or unsubstituted naphthyl group, and a substituted or unsubstituted indenyl group having 5 to 30 carbon atoms. , or more preferably a substituted or unsubstituted naphthyl group having 6 to 30 carbon atoms, more preferably a substituted or unsubstituted naphthyl group having 10 to 30 carbon atoms, and 10 to Particularly preferred are 20 substituted or unsubstituted naphthyl groups.

In particular, L is a single bond, or -O-, -NR ^a11 - (where R ^a11 is a hydrogen atom, an aliphatic hydrocarbon group having 1 to 10 carbon atoms), -S-, -C (=O )—, —S(=O) ₂ —, and in the case of a divalent linking group selected from groups formed by linking two or more of these, X is a substituted or unsubstituted naphthyl group is preferably represented.

Specific examples of preferred structural units of formula (A-1) are shown below, but the present invention is not limited thereto.

(2) Structural Unit Derived from a Fluoroaliphatic Group-Containing Monomer The fluoroaliphatic group-containing polymer A has a structure derived from a fluoroaliphatic group-containing monomer together with the structural unit represented by the above formula (A-1). has units. This structural unit is preferably a structural unit represented by the following formula (A-2). Details of the group represented by the following formula (A-2) are described below.

In the above formula (A-2), Mp 'represents a trivalent group constituting part of the main chain of the polymer, L 'represents a single bond or a divalent linking group, and Rf is at least one fluorine atom. represents a substituent containing

In the above formula (A-2), Mp' has the same meaning as Mp in the above formula (A-1), and the preferred range is also the same.
L' is preferably -O- or -NR ^a11 - (where R ^a11 represents a hydrogen atom, an aliphatic hydrocarbon group having 1 to 10 carbon atoms or an aryl group having 6 to 20 carbon atoms). , -S-, -C(=O)-, -S(=O) ₂ -, a substituted or unsubstituted alkylene group having 1 to 20 carbon atoms, and formed by linking two or more of these is a divalent linking group selected from the group consisting of groups;
As the divalent linking group formed by linking two or more, -C(=O)O-, -OC(=O)-, -OC(=O)O-, -C(=O)NH -, -NHC(=O)-, -C(=O)O(CH ₂ ) _ma O- (where ma represents an integer of 1 to 20), and the like.

Furthermore, when Mp' in the above formula (A-2) represents Mp-1 or Mp-2, L' is -O-, -NR ^a11 - (R ^a11 is a hydrogen atom, a carbon atom represents an aliphatic hydrocarbon group of number 1 to 10.), -S-, -C(=O)-, -S(=O) ₂ -, substituted or unsubstituted alkylene group having 1 to 20 carbon atoms , and preferably a divalent linking group selected from the group consisting of groups formed by linking two or more of these, -O-, -C (=O) O-, -C ( =O) NH—, and more preferably a divalent linking group selected from the group consisting of a group consisting of a combination of one or more of these and an alkylene group, the above (L-1), (L- 2) or (L-3) is more preferable.

Rf is, for example, an aliphatic hydrocarbon group having 1 to 30 carbon atoms substituted with at least one fluorine atom (e.g., trifluoroethyl group, perfluorohexylethyl group, perfluorohexylpropyl group, perfluorobutylethyl group, perfluorooctylethyl group, etc.).

Rf preferably has a CF ₃ group or a CF ₂ H group at its terminal, more preferably has a CF ₃ group, and is an alkyl group having a CF ₃ group at its terminal or a CF ₂ H group at its terminal. More preferably, it is an alkyl group.
An alkyl group having a CF ₃ group at its terminal is an alkyl group in which some or all of the hydrogen atoms contained in the alkyl group have been substituted with fluorine atoms. An alkyl group in which 50% or more of the hydrogen atoms in the alkyl group having a terminal CF ₃ group are substituted with fluorine atoms is preferred, an alkyl group in which 60% or more is substituted is more preferred, and 70% or more is substituted. are particularly preferred. The remaining hydrogen atoms may be further substituted with substituents exemplified as Substituent Group D described later.
An alkyl group having a CF ₂ H group at its terminal is an alkyl group in which some or all of the hydrogen atoms contained in the alkyl group have been substituted with fluorine atoms. 50% or more of the hydrogen atoms in the alkyl group having a terminal CF ₂ H group are preferably substituted with fluorine atoms, more preferably 60% or more are substituted, and 70% or more are substituted. It is especially preferable to have The remaining hydrogen atoms may be further substituted with substituents exemplified as Substituent Group D described later.

Substituent group D
Alkyl group (preferably the number of carbon atoms (referring to the number of carbon atoms possessed by the substituent, hereinafter the same applies to substituent group D)) 1 to 20, more preferably 1 to 12 carbon atoms, particularly preferably carbon atoms an alkyl group of number 1 to 8, such as methyl, ethyl, isopropyl, tert-butyl, n-octyl, n-decyl, n-hexadecyl, cyclopropyl, cyclopentyl, cyclohexyl; etc.)
- an alkenyl group (preferably an alkenyl group having 2 to 20 carbon atoms, more preferably 2 to 12 carbon atoms, particularly preferably 2 to 8 carbon atoms, such as a vinyl group, a 2-butenyl group, a 3- pentenyl group, etc.)
Alkynyl group (preferably an alkynyl group having 2 to 20 carbon atoms, more preferably 2 to 12 carbon atoms, particularly preferably 2 to 8 carbon atoms, such as propargyl group, 3-pentynyl group, etc.) )
- A substituted or unsubstituted amino group (preferably an amino group having 0 to 20 carbon atoms, more preferably 0 to 10 carbon atoms, particularly preferably 0 to 6 carbon atoms, such as an unsubstituted amino group, methylamino group, dimethylamino group, diethylamino group, etc.)

- An alkoxy group (preferably an alkoxy group having 1 to 20 carbon atoms, more preferably 1 to 12 carbon atoms, particularly preferably 1 to 8 carbon atoms, such as a methoxy group, an ethoxy group, a butoxy group, etc. include)
- Acyl group (preferably having 1 to 20 carbon atoms, more preferably 1 to 16 carbon atoms, particularly preferably 1 to 12 carbon atoms, such as acetyl group, formyl group, pivaloyl group, etc.) can be)
- An alkoxycarbonyl group (preferably an alkoxycarbonyl group having 2 to 20 carbon atoms, more preferably 2 to 16 carbon atoms, particularly preferably 2 to 12 carbon atoms, such as a methoxycarbonyl group, an ethoxycarbonyl group, etc. include)
- an acyloxy group (preferably an acyloxy group having 2 to 20 carbon atoms, more preferably 2 to 16 carbon atoms, particularly preferably 2 to 10 carbon atoms, such as an acetoxy group);

- an acylamino group (preferably an acylamino group having 2 to 20 carbon atoms, more preferably 2 to 16 carbon atoms, particularly preferably 2 to 10 carbon atoms, such as an acetylamino group);
- An alkoxycarbonylamino group (preferably an alkoxycarbonylamino group having 2 to 20 carbon atoms, more preferably 2 to 16 carbon atoms, particularly preferably 2 to 12 carbon atoms, such as a methoxycarbonylamino group, etc. include)
- A sulfonylamino group (preferably a sulfonylamino group having 1 to 20 carbon atoms, more preferably 1 to 16 carbon atoms, particularly preferably 1 to 12 carbon atoms, such as methanesulfonylamino group, ethanesulfonylamino groups, etc.)
- A sulfamoyl group (preferably a sulfamoyl group having 0 to 20 carbon atoms, more preferably 0 to 16 carbon atoms, particularly preferably 0 to 12 carbon atoms, such as sulfamoyl group, methylsulfamoyl group, dimethyl sulfamoyl group, etc.)

- an alkylthio group (preferably an alkylthio group having 1 to 20 carbon atoms, more preferably 1 to 16 carbon atoms, particularly preferably 1 to 12 carbon atoms, such as a methylthio group and an ethylthio group);
- A sulfonyl group (preferably a sulfonyl group having 1 to 20 carbon atoms, more preferably 1 to 16 carbon atoms, particularly preferably 1 to 12 carbon atoms, such as mesyl and tosyl groups)
- A sulfinyl group (preferably a sulfinyl group having 1 to 20 carbon atoms, more preferably 1 to 16 carbon atoms, particularly preferably 1 to 12 carbon atoms, such as a methanesulfinyl group, an ethanesulfinyl group, etc.) can be)
- A ureido group (preferably a ureido group having 1 to 20 carbon atoms, more preferably 1 to 16 carbon atoms, particularly preferably 1 to 12 carbon atoms, such as an unsubstituted ureido group, a methylureido group, etc.) include)
A phosphoramide group (preferably a phosphate amide group having 1 to 20 carbon atoms, more preferably 1 to 16 carbon atoms, particularly preferably 1 to 12 carbon atoms, such as a diethyl phosphate amide group) can be)
・Others, hydroxy group, mercapto group, halogen atom (e.g. fluorine atom, chlorine atom, bromine atom, iodine atom), cyano group, sulfo group, carboxyl group, nitro group, hydroxamic acid group, sulfino group, hydrazino group, imino group , a silyl group (preferably a silyl group having 3 to 40 carbon atoms, more preferably 3 to 30 carbon atoms, particularly preferably a silyl group having 3 to 24 carbon atoms, such as a trimethylsilyl group), etc. is mentioned.

These substituents may be further substituted by these substituents.
Moreover, when there are two or more substituents, they may be the same or different. In addition, when possible, they may be bonded to each other to form a ring.

Examples of alkyl groups terminated with a CF ₃ group or alkyl groups terminated with a CF ₂ H group are shown below.
R1: nC ₈ F ₁₇ -
R2: nC ₆ F ₁₃ -
R3: nC ₄ F ₉ -
R4: _{nC8F17- ( CH2} ) _2-
R5: _{nC6F13- ( CH2} ) _3-
R6 : _nC4F9- ( _CH2 ) _2-
R7: H—(CF ₂ ) ₈ —
R8: H—(CF ₂ ) ₆ —
R9: H—(CF ₂ ) ₄ —
R10: H—(CF ₂ ) ₈ —(CH ₂ ) ₂ —
R11: H—(CF ₂ ) ₆ —(CH ₂ ) ₃ —
R12: H—(CF ₂ ) ₄ —(CH ₂ ) ₂ —
R13: _{nC7F15- ( CH2} ) _2-
R14: _{nC6F13- ( CH2} ) _3-
R15 : _nC4F9- ( _CH2 ) _2-

Specific examples of structural units derived from the fluoroaliphatic group-containing monomer used in the present invention are shown below, but the present invention is not limited thereto.

Further, in the fluoroaliphatic group-containing polymer A, in addition to the structural unit represented by the above formula (A-1) and the structural unit derived from the fluoroaliphatic group-containing monomer, these structural units are formed. It may contain a structural unit derived from a monomer copolymerizable with the monomer.

The content of the structural unit represented by the above formula (A-1) in the fluoroaliphatic group-containing polymer A is preferably 25 to 80 mol%, more preferably 30 to 60 mol%, as a molar ratio to all structural units. preferable.
In the fluoroaliphatic group-containing polymer A, the content of repeating units derived from a fluoroaliphatic group-containing monomer (preferably the group represented by the above formula (A-2)) is a molar ratio to all structural units. is 20 to 75 mol %, more preferably 30 to 70 mol %.
The content of structural units other than the above two types is preferably 60% by mass or less, more preferably 50% by mass or less.

Further, the fluoroaliphatic group-containing polymer A may be a random copolymer in which each structural unit is introduced irregularly, or a block copolymer in which each structural unit is introduced regularly. In the case of a combination, each structural unit may be synthesized in any order of introduction, and the same structural component may be used twice or more.
Further, the structural unit represented by the above formula (A) and the repeating unit derived from the fluoroaliphatic group-containing monomer may be of only one type, or may be of two or more types. . When two or more structural units represented by the above formula (A) are included, X preferably has the same condensed ring skeleton (combination of substituted and unsubstituted). In the case of two or more types, the above content rate is the total content rate.

Furthermore, the molecular weight range of the fluoroaliphatic group-containing polymer A is preferably 3,000 to 1,000,000, more preferably 5,000 to 50,000 in weight average molecular weight (Mw). Within this range, the solubility in the composition and leveling ability are high, and the effect of improving adhesion and wettability after surface treatment is high. The molecular weight distribution (Mw/Mn, where Mn is the number average molecular weight) of the polymer used in the present invention is preferably 1-4, more preferably 1.5-4.
Here, the weight average molecular weight in the present invention is a value measured by a gel permeation chromatography (GPC) method under the conditions shown below.
- Solvent (eluent): THF (tetrahydrofuran)
・Device name: TOSOH HLC-8320GPC
・Column: 3 TOSOH TSKgel Super HZM-H (4.6 mm × 15 cm) are connected and used ・Column temperature: 40°C
・Sample concentration: 0.1% by mass
・Flow rate: 1.0 ml/min
・ Calibration curve: TOSOH TSK standard polystyrene Mw = 2800000 to 1050 (Mw / Mn = 1.03 to 1.06) using a calibration curve from 7 samples

[Fluoro-aliphatic group-containing polymer B]
The polymerizable liquid crystal composition of the present invention contains a fluoroaliphatic group-containing polymer B represented by the following formula (B-0). As will be described later, the fluoroaliphatic-containing polymer B maintains the smoothness of the coating film surface in the initial stage of drying of the coating film, that is, the period when the fluidity is relatively high, and maintains a uniform coating film during the drying process of the coating film. I believe that it has the effect of promoting

In the above formula (B-0), p represents an integer of 1 or more, and means that p types of repeating units are included.
M represents a repeating unit derived from an ethylenically unsaturated monomer and containing q (q is an integer of 1 or more) types.
Further, d and e are mass percentages representing the polymerization ratio, Σdp represents a numerical value of 2 to 99% by mass, and Σep represents a numerical value of 1 to 98% by mass.
Moreover, R represents a hydrogen atom or a methyl group.
Further, X represents an oxygen atom, a sulfur atom or -N(R ^Z )-, and R ^Z represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.
In addition, m represents an integer of 1-6.
Also, n represents an integer of 0 to 5.
Y represents a hydrogen atom or a fluorine atom.

In the present invention, the fluoroaliphatic group-containing polymer B has the following formula (B) because it has good compatibility with the fluoroaliphatic group-containing polymer A and can suppress surface defects caused by phase separation. It is preferably a polymer represented by
Of the two repeating units in (B-0) above, the left repeating unit is a repeating unit that includes the left and middle repeating units in the following formula (B).
Of the two repeating units in (B-0) above, the right repeating unit is the same as the right repeating unit in formula (B) below.

In the above formula (B), i and j each independently represent an integer of 1 or more, meaning that i and j types of each repeating unit are included.
M represents a repeating unit (hereinafter abbreviated as "repeating unit M") that is derived from an ethylenically unsaturated monomer and includes k (k is an integer of 1 or more) types.
Further, a, b and c are mass percentages representing the polymerization ratio, Σai represents a numerical value of 1 to 98 mass%, Σbj represents a numerical value of 1 to 98 mass%, and Σck represents a numerical value of 1 to 98 mass%. represents
R ¹¹ and R ¹² each independently represent a hydrogen atom or a methyl group.
X ¹ and X ² each independently represent an oxygen atom, a sulfur atom or -N(R ¹³ )-, and R ¹³ represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.
In addition, m1 and m2 each independently represent an integer of 1 to 6.
Also, n1 represents an integer of 0-3.

In the above formula (B), the following repeating units B-1 and B-2 are, respectively, a fluoroaliphatic group-containing monomer having a terminal of -(CF ₂ CF ₂ ) ₃ F and a monomer having a terminal of -(CF ₂ CF ₂ ) ₂ . F is a repeating unit derived from a fluoroaliphatic group-containing monomer.

・ Repeating unit B-1

・ Repeating unit B-2

In the repeating units B-1 and B-2, X ¹ and X ² are each preferably O. That is, each of the repeating units A and B is preferably a repeating unit derived from a (meth)acrylic monomer.
m1 and m2 are each independently preferably 1-4, more preferably 1-2.
n1 is preferably 0 to 2, more preferably 0 or 1, most preferably 0.

In formula (B-0) or (B) above, M is a repeating unit derived from an ethylenically unsaturated monomer. M is preferably a repeating unit having a hydrogen-bonding polar group in its side chain. M is preferably a repeating unit represented by the following formula (B-3).

In formula (B-3) above, R ¹ , R ² and R ³ each independently represent a hydrogen atom, an alkyl group, a halogen atom or a group represented by -LQ. L represents a divalent linking group, and Q represents a polar group having hydrogen bonding properties.

L is preferably any group selected from the following group of linking groups, or a divalent linking group formed by combining two or more thereof.
(Linking group)
Single bond, -O-, -CO-, -NR ⁴ -, -S-, -SO ₂ -, -P(=O)(OR ⁵ )-, alkylene group, arylene group (R ⁴ is hydrogen atom, alkyl group, aryl group, or aralkyl group.R ⁵ represents an alkyl group, an aryl group, or an aralkyl group.)

More specifically, in the above formula (B-3), R ¹ , R ² and R ³ each independently represent a hydrogen atom, an alkyl group, a halogen atom (e.g., fluorine atom, chlorine atom, bromine atom, iodine atom, atom, etc.), or a group represented by -LQ described later, preferably a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, a chlorine atom, or a group represented by -LQ, A hydrogen atom and an alkyl group having 1 to 4 carbon atoms are more preferred, and a hydrogen atom and an alkyl group having 1 to 2 carbon atoms are particularly preferred.
Specific examples of alkyl groups that R ¹ , R ² and R ³ can take include methyl group, ethyl group, n-propyl group, n-butyl group, sec-butyl group and the like.
Moreover, the said alkyl group may have one or more substituents. Substituents include halogen atoms, aryl groups, heterocyclic groups, alkoxyl groups, aryloxy groups, alkylthio groups, arylthio groups, acyl groups, hydroxyl groups, acyloxy groups, amino groups, alkoxycarbonyl groups, acylamino groups, and oxycarbonyl groups. , carbamoyl group, sulfonyl group, sulfamoyl group, sulfonamide group, sulforyl group, carboxyl group and the like.

The number of carbon atoms in the alkyl group does not include the carbon atoms in the substituents. Hereinafter, the same applies to the number of carbon atoms of other groups.

In formula (B-3) above, L is a single bond, —O—, —CO—, —NR ⁴ —, —S—, —SO ₂ —, —PO(OR ⁵ )—, an alkylene group, an arylene group. or represents a divalent linking group formed by combining these. Here, ^R4 represents a hydrogen atom, an alkyl group, an aryl group, or an aralkyl group. ^R5 represents an alkyl group, an aryl group, or an aralkyl group.
L preferably includes a single bond, -O-, -CO-, -NR ⁴ -, -S-, -SO ₂ -, an alkylene group, an arylene group, and -CO-, -O-, -NR Particular preference is given to containing ^4- , alkylene or arylene groups. It is also preferred to contain an alkyleneoxy group containing both —O— and an alkylene group, and it is also preferred to contain a polyalkyleneoxy group containing repeating alkyleneoxy groups.
When L contains an alkylene group, the alkylene group preferably has 1 to 10 carbon atoms, more preferably 1 to 8 carbon atoms, and particularly preferably 1 to 6 carbon atoms. Specific examples of particularly preferred alkylene groups include a methylene group, ethylene group, trimethylene group, tetrabutylene group, hexamethylene group and the like. In addition, the alkylene group (meaning including the alkylene group contained in the alkyleneoxy group) may have a branched structure, and the number of carbon atoms in the alkylene chain of the branched portion is preferably 1 to 3.

When L contains an arylene group, the arylene group preferably has 6 to 24 carbon atoms, more preferably 6 to 18 carbon atoms, and particularly preferably 6 to 12 carbon atoms. Specific examples of particularly preferred arylene groups include a phenylene group and a naphthalene group.
When L contains a divalent linking group obtained by combining an alkylene group and an arylene group (that is, an aralkylene group), the number of carbon atoms in the aralkylene group is preferably 7 to 34, more preferably 7 to 26, particularly preferably 7-16. Specific examples of particularly preferred aralkylene groups include a phenylenemethylene group, a phenyleneethylene group, and a methylenephenylene group.
The groups listed as L may have suitable substituents. Examples of such substituents include the same substituents as the substituents described above for R ¹ to R ³ .
Specific structures of L are illustrated below, but the present invention is not limited to these specific examples.

However, in L-28, R ⁵¹ to R ⁵⁸ are each a hydrogen atom or an alkyl group (preferably having 1 to 4 carbon atoms, more preferably 1 to 2 carbon atoms), and n is 1 to 12 (preferably 2 ~10 integers). Any one of R ⁵³ and R ⁵⁴ , R ⁵⁵ and R ⁵⁶ , and R ⁵⁷ and R ⁵⁸ is preferably a hydrogen atom and the other is an alkyl group.

In the above formula (B-3), Q is not particularly limited as long as it is a polar group having hydrogen bonding properties. Preferably hydroxyl group, carboxyl group, salt of carboxyl group, amide of carboxylic acid (N-unsubstituted or N-mono lower alkyl substituted, such as -CONH ₂ , -CONHCH ₃ etc.) sulfo group, salt of sulfo group, sulfonamide groups (N unsubstituted or N-mono lower alkyl substituted, —SO ₂ NH ₂ , —SO ₂ NHCH ₃ etc.), phospho groups, phosphonamides (N unsubstituted or N-mono lower alkyl substituted, such as — OP(=O)(NH ₂ ) ₂ , —OP(=O)(NHCH ₃ ) ₂ etc.), ureido group (—NHCONH ₂ ), N-position unsubstituted or monosubstituted amino group (—NH ₂ , —NHCH ₃ ), etc. (wherein the lower alkyl group represents a methyl group or an ethyl group).
More preferred are a hydroxyl group, a carboxyl group, a sulfo group and a phospho group, more preferred is a hydroxyl group or a carboxyl group, and particularly preferred is a hydroxyl group.

The repeating unit represented by formula (B-3) above is preferably a repeating unit derived from a (meth)acrylic monomer.
Specific examples of the ethylenically unsaturated monomer from which the repeating unit M is derived are shown below, but are not limited thereto.

The fluoroaliphatic group polymer represented by the above formula (B) contains at least one repeating unit B-1, B-2 and M each. That is, in the formula (B), i, j and k, which mean the number of types of repeating units, are each an integer of 1 or more. The fluoroaliphatic group polymer represented by the above formula (B) may contain two or more kinds of each repeating unit, and may contain repeating units other than repeating units B-1, B-2 and M. You can

In the above formula (B), a, b and c are mass percentages representing the polymerization ratio of monomers deriving each repeating unit, Σai represents a numerical value of 1 to 98% by mass, and Σbj represents a value of 1 to 98% by mass. Σck represents a numerical value of 1 to 98% by mass.
Σai is 5 to 40% by mass, Σbj is preferably 5 to 40% by mass, Σck is preferably 20 to 90% by mass, Σai is 10 to 35% by mass, and Σbj is 10 to 35% by mass. and Σck is more preferably 30 to 80% by mass.
The fluoroaliphatic group-containing polymer B represented by the above formula (B) may contain repeating units other than the above repeating units B-1, B-2 and M, that is, Σai + Σbj + Σck < 100% by mass. However, it is preferable not to contain repeating units other than the repeating units B-1, B-2 and M, that is, Σai+Σbj+Σck=100 mass %.

Further, the ratio of the repeating units B-1 and B-2 derived from the fluoroaliphatic group-containing monomer contained in the fluoroaliphatic group-containing polymer is the total mass Σai of the i type repeating unit B-1, and the j type is preferably 20 to 50% by mass, more preferably 25 to 45% by mass, even more preferably 25 to 40% by mass. . It is presumed that within this range, the formation of micro-unevenness presumed to be caused by convection, which occurs in the early stage of drying of the coating film, can be suppressed.
From the same point of view, the ratio of Σai to Σai+Σbj (Σai/(Σai+Σbj)) is preferably 0.2 to 0.8, more preferably 0.3 to 0.6, and 0.3 to 0.6. More preferably 35 to 0.55.

The addition amount range of the fluoroaliphatic group-containing polymer A and the fluoroaliphatic group-containing polymer B used in the present invention is preferably 0.01 to 5 in terms of the total amount with respect to the total solid content of the polymerizable liquid crystal composition. % by mass, more preferably 0.1 to 1.0% by mass, still more preferably 0.05 to 0.5% by mass. Within this range, the leveling and orientation control are good, and the adverse effect of the surface state of the resulting optically anisotropic film on lamination and adhesion with other functional layers can be suppressed.

Further, the fluoroaliphatic group-containing polymer A is preferably 0.01 to 0.3% by mass, more preferably 0.02 to 0.1% by mass, based on the total solid content of the polymerizable liquid crystal composition. and more preferably 0.05 to 0.09% by mass. The fluoroaliphatic group-containing polymer B is preferably 0.01 to 0.3% by mass, more preferably 0.02 to 0.1% by mass, based on the total solid content of the polymerizable liquid crystal composition. , more preferably 0.03 to 0.08% by mass. The ratio of the fluoroaliphatic group-containing polymer A and the fluoroaliphatic group-containing polymer B is not particularly limited, but the mass ratio of the fluoroaliphatic group-containing polymer A: fluoroaliphatic group-containing polymer B is 8:2 to 4: The range of 6 is preferable from the viewpoint of both suppression of unevenness in initial drying and control of alignment state.

Polymers used in the present invention can be synthesized by applying known methods. The polymer used in the present invention can be synthesized by any one of addition, condensation, substitution reaction, etc., or a combination thereof. Although there is no particular limitation, when the polymer used in the present invention contains an ethylenic repeating unit, it is simple and preferable to synthesize it by radical polymerization reaction of an ethylenically unsaturated compound corresponding to the repeating unit.

[Polyfunctional polymerizable monomer]
The polymerizable liquid crystal composition of the present invention exhibits the above-mentioned reverse wavelength dispersion from the viewpoint of strongly cohering the optically anisotropic film to suppress cohesive failure of the film and realizing a laminate having excellent adhesion. It preferably contains a polymerizable compound (polyfunctional polymerizable monomer) that is neither a liquid crystal compound nor another polymerizable liquid crystal compound and has two or more polymerizable groups.
The polyfunctional polymerizable monomer is preferably a polyfunctional radically polymerizable monomer. Specific examples of polyfunctional radically polymerizable monomers include polymerizable monomers described in paragraphs [0018] to [0020] of JP-A-2002-296423.
The content of the polyfunctional polymerizable monomer is preferably 1 to 50% by mass, more preferably 2 to 30% by mass, based on the total mass of the liquid crystal compound.

[Polymerization initiator]
The polymerizable liquid crystal composition of the invention preferably contains a polymerization initiator.
The polymerization initiator used is preferably a photopolymerization initiator capable of initiating the polymerization reaction by irradiation with ultraviolet rays.
Examples of photopolymerization initiators include α-carbonyl compounds (described in US Pat. Nos. 2,367,661 and 2,367,670), acyloin ethers (described in US Pat. No. 2,448,828), and α-hydrocarbon-substituted aromatic compounds. group acyloin compounds (described in US Pat. No. 2,722,512), polynuclear quinone compounds (described in US Pat. No. 3549367), acridine and phenazine compounds (Japanese Patent Laid-Open No. 60-105667, US Pat. No. 4,239,850) and oxadiazole compounds (US Pat. No. 4,212,970), acylphosphine Oxide compounds (described in JP-B-63-40799, JP-B-5-29234, JP-A-10-95788, JP-A-10-29997) and the like.

In the present invention, the polymerization initiator is preferably an oxime-type polymerization initiator for the reason that wet heat durability is better, and specifically, a polymerization initiator represented by the following formula (I). It is more preferable to have

^In formula (I) above, X2 represents a hydrogen atom or a halogen atom.
In formula (I) above, Ar ³ represents a divalent aromatic group, and D ⁵ represents a divalent organic group having 1 to 12 carbon atoms.
In formula (I) above, R ¹¹ represents an alkyl group having 1 to 12 carbon atoms, and Y ² represents a monovalent organic group.

^In the above formula (I), the halogen atom represented by X2 includes, for example, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, etc. Among them, a chlorine atom is preferable.
In the above formula (I), the divalent aromatic group represented by Ar ³ includes, for example, aromatic hydrocarbon rings such as benzene ring, naphthalene ring, anthracene ring, phenanthroline ring; furan ring, pyrrole ring; , an aromatic heterocyclic ring such as a thiophene ring, a pyridine ring, a thiazole ring, and a benzothiazole ring; and the like.
In the above formula (I), the divalent organic group having 1 to 12 carbon atoms represented by D ⁵ includes, for example, a linear or branched alkylene group having 1 to 12 carbon atoms. preferably includes a methylene group, an ethylene group, a propylene group, and the like.
Further, in the above formula (I), specific examples of the alkyl group having 1 to 12 carbon atoms represented by R ¹¹ preferably include a methyl group, an ethyl group, a propyl group and the like.
In the above formula (I), the monovalent organic group represented by Y ² includes, for example, a functional group containing a benzophenone skeleton ((C ₆ H ₅ ) ₂ CO). Specifically, a functional group containing a benzophenone skeleton having an unsubstituted or monosubstituted terminal benzene ring, such as groups represented by the following formulas (Ia) and (Ib), is preferred. In the following formulas (Ia) and (Ib), * represents the bonding position, that is, the bonding position with the carbon atom of the carbonyl group in the above formula (I).

Examples of the oxime-type polymerization initiator represented by the above formula (I) include compounds represented by the following formula (S-1) and compounds represented by the following formula (S-2). .

In the present invention, the content of the polymerization initiator is not particularly limited. is more preferred.

〔solvent〕
The polymerizable liquid crystal composition of the present invention preferably contains a solvent from the viewpoint of workability for forming an optically anisotropic film.
Specific examples of solvents include ketones (eg, acetone, 2-butanone, methyl isobutyl ketone, cyclohexanone, cyclopentanone, etc.), ethers (eg, dioxane, tetrahydrofuran, etc.), and aliphatic hydrocarbons. (e.g., hexane, etc.), alicyclic hydrocarbons (e.g., cyclohexane, etc.), aromatic hydrocarbons (e.g., toluene, xylene, trimethylbenzene, etc.), halogenated carbons (e.g., dichloromethane, dichloroethane, dichlorobenzene) , chlorotoluene, etc.), esters (e.g., methyl acetate, ethyl acetate, butyl acetate, etc.), water, alcohols (e.g., ethanol, isopropanol, butanol, cyclohexanol, etc.), cellosolves (e.g., methyl cellosolve, ethyl cellosolve etc.), cellosolve acetates, sulfoxides (e.g., dimethylsulfoxide, etc.), amides (e.g., dimethylformamide, dimethylacetamide, etc.), etc., and these may be used singly or in combination of two or more. You may

[Other ingredients]
The polymerizable liquid crystal composition of the present invention may contain components other than the components described above. and chiral agents for cholesteric orientation.

[Optically anisotropic film]
The optically anisotropic film of the present invention is an optically anisotropic film formed from the polymerizable liquid crystal composition of the present invention described above.
As a method for forming an optically anisotropic film, for example, a method of using the above-described polymerizable liquid crystal composition of the present invention to achieve a desired alignment state and then fixing the composition by polymerization can be used.
Here, polymerization conditions are not particularly limited, but it is preferable to use ultraviolet rays in the polymerization by light irradiation. The irradiation dose is preferably 10 mJ/cm ² to 50 J/cm ² , more preferably 20 mJ/cm ² to 5 J/cm ² , even more preferably 30 mJ/cm ² to 3 J/cm ² . , 50 to 1000 mJ/cm ² . Moreover, in order to accelerate the polymerization reaction, it may be carried out under heating conditions.
In the invention, the optically anisotropic film can be formed on an arbitrary support, which will be described later, or on a polarizer in the polarizing plate of the invention, which will be described later.

1A and 1B are schematic cross-sectional views showing an example of the optically anisotropic film of the present invention.
The optically anisotropic film 10 shown in FIG. 1A has only the positive A plate 12, and the optically anisotropic film 10 shown in FIG. It is an aspect.

The thickness of the optically anisotropic film can be arbitrarily set according to the required retardation, but is typically preferably 0.1 to 10 μm, more preferably 0.1 to 5 μm. , more preferably 0.1 μm or more and less than 3 μm.

When the optically anisotropic film is a polymerizable liquid crystal compound (1) or the like whose orientation is fixed by homogeneous alignment, the polymerizable liquid crystal compound (1) has reverse wavelength dispersion, so the following formula (3) is satisfied, and when the following formula (3) is satisfied, it is preferable that the following formula (4) is also satisfied.
Re(450)/Re(550)<1 (3)
0.50<Re(450)/Re(550)<1.00 (4)

In the above formulas (3) and (4), Re(450) represents the in-plane retardation of the optically anisotropic film at a wavelength of 450 nm, and Re(550) represents the in-plane retardation of the optically anisotropic film at a wavelength of 550 nm. Represents retardation. In this specification, unless the measurement wavelength of retardation is specified, the measurement wavelength is assumed to be 550 nm.

In the present invention, the values of in-plane retardation and retardation in the thickness direction refer to values measured using light of a measurement wavelength using AxoScan OPMF-1 (manufactured by Optoscience).
Specifically, by inputting the average refractive index ((Nx+Ny+Nz)/3) and film thickness (d (μm)) in AxoScan OPMF-1,
Slow axis direction (°)
Re(λ)=R0(λ)
Rth(λ)=((nx+ny)/2−nz)×d
is calculated.
Note that R0(λ), which is displayed as a numerical value calculated by AxoScan OPMF-1, means Re(λ).

The optically anisotropic layer of the present invention can take any orientation state, for example, in addition to the homogeneous orientation described above, it can take homeotropic orientation, twisted nematic orientation, cholesteric orientation, hybrid orientation, splay orientation, and the like. Since the polymerizable liquid crystal composition of the invention has a high effect of imparting even and uniform optical anisotropy particularly in the case of homogeneous alignment, twisted nematic alignment and cholesteric alignment, homogeneous alignment, twisted nematic alignment and cholesteric alignment can be obtained. Homogeneous orientation is preferred, and homogeneous orientation is particularly preferred.

When the orientation of the polymerizable liquid crystal compound (1) or the like is fixed in a homogeneous orientation, the optically anisotropic layer can exhibit the characteristics of a positive A plate. Here, the positive A plate (positive A plate) is defined as follows.
nx is the refractive index in the film in-plane slow axis direction (the direction in which the in-plane refractive index is maximized), ny is the refractive index in the direction perpendicular to the in-plane slow axis, and the refraction in the thickness direction When the rate is nz, the positive A plate satisfies the relationship of formula (A1).
Formula (A1) nx>ny≈nz
Note that the above "≈" includes not only the case where both are completely the same, but also the case where both are substantially the same.
"Substantially the same" means that, for a positive A plate, for example, (ny-nz) x d (where d is the thickness of the film) is -10 to 10 nm, preferably -5 to 5 nm. It is included in "ny≈nz", and the case where (nx−nz)×d is −10 to 10 nm, preferably −5 to 5 nm is also included in “nx≈nz”.

[Optical film]
The optical film of the present invention is an optical film having an optically anisotropic film.
Various members used in the optical film of the present invention are described in detail below.

[Optically anisotropic film]
The optically anisotropic film of the optical film of the present invention is as described above.

In the formation, in forming an optically anisotropic film by fixing the polymerizable liquid crystal composition of the present invention in a homogeneous orientation directly on a long support or via an alignment film, an optically anisotropic film is formed. It is possible to control the slow axis of the film. The angle formed between the slow axis of the optically anisotropic film and the longitudinal direction of the elongated support can be appropriately set depending on the use of the optically anisotropic film. For example, it can be 0° to 90° (parallel or orthogonal) to the longitudinal direction and can have an angle of 10-80°. For example, as a polarizing plate to be described later, when used in combination with a linear polarizer having an elongated shape and an absorption axis in its longitudinal direction to form a circularly polarizing plate, the slow axis of the optically anisotropic film and the ratio of the optical film By setting the angle formed by the longitudinal direction in the range of 40 to 50°, the circularly polarizing plate can be produced by a roll-to-roll process with excellent productivity, which is preferable.

[Support]
The optical film of the invention may have a support as a substrate for forming an optically anisotropic film, as described above.
Such a support is preferably transparent, and more specifically, preferably has a light transmittance of 80% or more.

Examples of such supports include glass substrates and polymer films, and materials for the polymer films include cellulose-based polymers; Polymer; Thermoplastic norbornene-based polymer; Polycarbonate-based polymer; Polyester-based polymer such as polyethylene terephthalate and polyethylene naphthalate; Styrene-based polymer such as polystyrene, acrylonitrile-styrene copolymer (AS resin); Polyolefin-based polymers such as polymers; vinyl chloride-based polymers; amide-based polymers such as nylon and aromatic polyamides; imide-based polymers; sulfone-based polymers; polyethersulfone-based polymers; vinylidene chloride-based polymer; vinyl alcohol-based polymer; vinyl butyral-based polymer; arylate-based polymer; polyoxymethylene-based polymer;
A polarizer, which will be described later, may also serve as such a support.

In the present invention, the thickness of the support is not particularly limited, but is preferably 5 to 60 μm, more preferably 5 to 30 μm.
Further, the support may constitute an optical film together, or may be separated from the optically anisotropic film as a temporary support and only the optically anisotropic film may be used.

[Alignment film]
When the optical film of the invention has any of the above supports, it preferably has an alignment film between the support and the optically anisotropic film. In addition, the above-described support may also serve as an alignment film.

The alignment film generally contains a polymer as a main component. Polymer materials for alignment films are described in many documents, and many commercial products are available.
The polymer material utilized in the present invention is preferably polyvinyl alcohol or polyimide, and derivatives thereof. Modified or unmodified polyvinyl alcohol is particularly preferred.
Alignment films that can be used in the present invention include, for example, alignment films described in WO01/88574, page 43, line 24 to page 49, line 8; ]; a liquid crystal alignment film formed by a liquid crystal alignment agent described in JP-A-2012-155308; and the like.

In the present invention, it is also preferable to use a photo-alignment film as the alignment film because it is possible to prevent surface deterioration by not contacting the surface of the alignment film during formation of the alignment film.
The photo-alignment film is not particularly limited, but polymer materials such as polyamide compounds and polyimide compounds described in paragraphs [0024] to [0043] of WO 2005/096041; described in JP-A-2012-155308. A liquid crystal aligning film formed by a liquid crystal aligning agent having a photo-aligning group; LPP-JP265CP (trade name, manufactured by Rolic Technologies) can be used.

In the present invention, the thickness of the alignment film is not particularly limited. It is preferably from 01 to 10 μm, more preferably from 0.01 to 1 μm, even more preferably from 0.01 to 0.5 μm.

[Hard coat layer]
The optical film of the present invention can be provided with a hard coat layer in order to impart physical strength to the film. Specifically, a hard coat layer may be provided on the side of the support opposite to the side on which the alignment film is provided, and a hard coat layer may be provided on the side of the optically anisotropic film opposite to the side on which the alignment film is provided. You may have a coat layer.
As the hard coat layer, those described in paragraphs [0190] to [0196] of JP-A-2009-98658 can be used.

[Other optically anisotropic films]
The optical film of the invention may have another optically anisotropic film apart from the optically anisotropic film of the invention. That is, the optical film of the invention may have a laminated structure of the optically anisotropic film of the invention and another optically anisotropic film.
Such other optically anisotropic films include polymer films, films in which the orientation state of an arbitrary liquid crystal compound is fixed (simply referred to as "liquid crystal film"), and optically anisotropic inorganic substances oriented in resins. Examples include a membrane immobilized by drying, and can be combined with any one. The laminated structure may be formed via an adhesive layer, or may be directly laminated by direct coating or self-adhesiveness. Also, a plurality of optically anisotropic films of the present invention having different optical properties may be laminated.

[Ultraviolet absorber]
The optical film of the present invention preferably contains an ultraviolet (UV) absorber in consideration of the influence of external light (especially ultraviolet light).
The ultraviolet absorber may be contained in the optically anisotropic film of the invention, or may be contained in a member other than the optically anisotropic film constituting the optical film of the invention. Examples of suitable members other than the optically anisotropic film include supports.
As the ultraviolet absorber, any conventionally known one capable of exhibiting ultraviolet absorbency can be used. Among such UV absorbers, benzotriazole-based or hydroxyphenyltriazine-based UV absorbers can be used from the viewpoint of obtaining UV absorbability (UV-cutting capability) used in image display devices because of their high UV absorbency. preferable.
Moreover, two or more ultraviolet absorbers having different maximum absorption wavelengths can be used in combination in order to widen the absorption width of ultraviolet rays.
Specific examples of the ultraviolet absorber include, for example, compounds described in paragraphs [0258] to [0259] of JP-A-2012-18395, paragraphs [0055] to [0105] of JP-A-2007-72163. and the like compounds described in.
In addition, as commercially available products, Tinuvin400, Tinuvin405, Tinuvin460, Tinuvin477, Tinuvin479, and Tinuvin1577 (all manufactured by BASF) can be used.

[Polarizer]
The polarizing plate of the present invention comprises the above optical film of the present invention and a polarizer.
Moreover, the polarizing plate of the present invention can be used as a circularly polarizing plate when the optically anisotropic film of the present invention is a λ/4 plate (positive A plate).
Further, when the above-mentioned optically anisotropic film of the present invention is a λ/4 plate (positive A plate), the polarizing plate of the present invention has the slow axis of the λ/4 plate and the absorption axis of the polarizer described later. The angle formed by the two is preferably 30 to 60°, more preferably 40 to 50°, still more preferably 42 to 48°, and particularly preferably 45°.
Here, the "slow axis" of the λ / 4 plate means the direction in which the refractive index is maximized in the plane of the λ / 4 plate, and the "absorption axis" of the polarizer means the direction of the highest absorbance. do.

FIG. 2 is a schematic cross-sectional view showing an example (circularly polarizing plate) of the polarizing plate of the present invention.
Circular polarizer 16 shown in FIG. 2 includes polarizer 18, positive A plate 12, and positive C plate 14 in that order. In FIG. 2, the circularly polarizing plate 16 is arranged in the order of the polarizer 18, the positive A plate 12, and the positive C plate 14, but is not limited to this embodiment. A plate and a positive A plate may be arranged in this order.

FIG. 3 is a diagram showing the relationship between the absorption axis of the polarizer and the in-plane slow axis of the positive A plate in the polarizing plate of the present invention.
In FIG. 3, the arrow in the polarizer 18 indicates the direction of the absorption axis, and the arrow in the positive A-plate 12 indicates the direction of the in-plane slow axis in the layer.

[Polarizer]
The polarizer included in the polarizing plate of the present invention is not particularly limited as long as it is a member having a function of converting light into specific linearly polarized light, and conventionally known absorptive polarizers and reflective polarizers can be used. .
As the absorbing polarizer, an iodine-based polarizer, a dye-based polarizer using a dichroic dye, a polyene-based polarizer, or the like is used. Iodine-based polarizers and dye-based polarizers include coating-type polarizers and stretching-type polarizers, and both can be applied. child is preferred.
In addition, as a method of obtaining a polarizer by stretching and dyeing a laminated film in which a polyvinyl alcohol layer is formed on a substrate, Japanese Patent No. 5048120, Japanese Patent No. 5143918, Japanese Patent No. 4691205, Patent No. 4,751,481 and Japanese Patent No. 4,751,486 can be cited, and known techniques relating to these polarizers can also be preferably used.
As a reflective polarizer, a polarizer in which thin films having different birefringences are laminated, a wire grid polarizer, a polarizer in which a cholesteric liquid crystal having a selective reflection region and a quarter wavelength plate are combined, and the like are used.
Among them, polyvinyl alcohol-based resin (a polymer containing —CH ₂ —CHOH— as a repeating unit. In particular, at least one polymer selected from the group consisting of polyvinyl alcohol and ethylene-vinyl alcohol copolymers is preferred in terms of better adhesion. ) is preferably a polarizer.

In the present invention, the thickness of the polarizer is not particularly limited, but is preferably 1 μm to 60 μm, more preferably 2 μm to 30 μm, even more preferably 5 μm to 15 μm.

[Adhesive layer]
In the polarizing plate of the invention, a pressure-sensitive adhesive layer may be arranged between the optically anisotropic film in the optical film of the invention and the polarizer.
As the pressure-sensitive adhesive layer used for laminating the optically anisotropic film and the polarizer, for example, the ratio of the storage elastic modulus G′ to the loss elastic modulus G″ measured by a dynamic viscoelasticity measuring device (tan δ= G″/G′) refers to substances with a ratio of 0.001 to 1.5, including so-called adhesives and substances that tend to creep. Examples of adhesives that can be used in the present invention include, but are not limited to, polyvinyl alcohol-based adhesives.

[Image display device]
The image display device of the present invention is an image display device having the optical film of the present invention or the polarizing plate of the present invention.
The display element used in the image display device of the present invention is not particularly limited, and examples thereof include liquid crystal cells, organic electroluminescence (hereinafter abbreviated as "EL") display panels, and plasma display panels.
Among these, liquid crystal cells and organic EL display panels are preferable, and liquid crystal cells are more preferable. That is, the image display device of the present invention is preferably a liquid crystal display device using a liquid crystal cell as a display element, or an organic EL display device using an organic EL display panel as a display element, and is preferably a liquid crystal display device. more preferred.

[Liquid crystal display device]
A liquid crystal display device, which is an example of the image display device of the present invention, is a liquid crystal display device having the above-described polarizing plate of the present invention and a liquid crystal cell.
In the present invention, of the polarizing plates provided on both sides of the liquid crystal cell, the polarizing plate of the present invention is preferably used as the front-side polarizing plate, and the polarizing plate of the present invention is used as the front-side and rear-side polarizing plates. is more preferred.
The liquid crystal cell constituting the liquid crystal display device will be described in detail below.

<Liquid crystal cell>
Liquid crystal cells used in liquid crystal display devices are preferably in VA (Vertical Alignment) mode, OCB (Optically Compensated Bend) mode, IPS (In-Plane-Switching) mode, or TN (Twisted Nematic) mode. It is not limited to these.
In the TN mode liquid crystal cell, the rod-like liquid crystal molecules are substantially horizontally aligned when no voltage is applied, and are twisted at an angle of 60 to 120°. TN mode liquid crystal cells are most commonly used as color TFT liquid crystal display devices, and are described in many documents.
In the VA mode liquid crystal cell, the rod-like liquid crystal molecules are aligned substantially vertically when no voltage is applied. VA mode liquid crystal cells include (1) a narrowly defined VA mode liquid crystal cell in which rod-like liquid crystalline molecules are aligned substantially vertically when no voltage is applied and substantially horizontally aligned when voltage is applied (Japanese Unexamined Patent Application Publication No. 2-2002). 176625), and (2) a liquid crystal cell in which the VA mode is multi-domained (MVA mode) for widening the viewing angle (SID97, Digest of tech. Papers (preliminary collection) 28 (1997) 845). ), (3) A liquid crystal cell in a mode (n-ASM mode) in which rod-like liquid crystalline molecules are substantially vertically aligned when no voltage is applied and twisted multi-domain alignment is performed when voltage is applied (Proceedings of the Japan Liquid Crystal Forum 58-59 (1998)) and (4) Survival mode liquid crystal cells (presented at LCD International 98). In addition, any of PVA (Patterned Vertical Alignment) type, optical alignment type, and PSA (Polymer-Sustained Alignment) type may be used. Details of these modes are described in Japanese Unexamined Patent Application Publication No. 2006-215326 and Japanese National Publication of International Patent Application No. 2008-538819.
In the IPS mode liquid crystal cell, the rod-like liquid crystal molecules are aligned substantially parallel to the substrate, and the liquid crystal molecules respond planarly by applying an electric field parallel to the substrate surface. In the IPS mode, a black display is obtained when no electric field is applied, and the absorption axes of the pair of upper and lower polarizing plates are perpendicular to each other. A method of using an optical compensatory sheet to reduce leakage light during black display in an oblique direction and improve the viewing angle is disclosed in Japanese Patent Application Laid-Open Nos. 10-54982, 11-202323 and 9-292522. JP-A-11-133408, JP-A-11-305217 and JP-A-10-307291.

[Organic EL display device]
An organic EL display device, which is an example of the image display device of the present invention, includes, from the viewing side, a polarizer, a λ/4 plate (positive A plate) comprising the optically anisotropic film of the present invention, and an organic EL display device. A preferred embodiment includes a display panel in this order.

An organic EL display device will be described with reference to the drawings. FIG. 4 shows a schematic cross-sectional view showing an example of an organic EL display device which is one aspect of the image display device of the present invention.
The organic EL display device 20 shown in FIG. 4 has a linear polarizer 18, a positive A plate 12, a positive C plate 14, and an organic EL display panel 22 in this order. Incidentally, as shown in FIG. 4, the linear polarizer 18 in the circularly polarizing plate 16 is arranged on the viewing side.
Also, the organic EL display panel 22 is a display panel configured using an organic EL element in which an organic light-emitting layer (organic electroluminescence layer) is sandwiched between electrodes (between a cathode and an anode).
The configuration of the organic EL display panel 22 is not particularly limited, and a known configuration is adopted.

EXAMPLES The characteristics of the present invention will be described more specifically below with reference to examples and comparative examples. The materials, amounts used, proportions, processing details, processing procedures, etc. shown in the following examples can be changed as appropriate without departing from the gist of the present invention. Therefore, the scope of the present invention should not be construed to be limited by the specific examples shown below.

[Example 1]
[Preparation of alignment film P-1]
On a commercially available triacetyl cellulose film (manufactured by Fujifilm, trade name: Z-TAC), JP 2012-155308 A, with reference to the description of Example 3, prepare a coating solution 1 for photo-alignment film. , was applied with a wire bar. It was dried with warm air at 60° C. for 60 seconds to prepare an alignment film P-1 with a thickness of 300 nm.

[Preparation of optical film 1]
The following polymerizable liquid crystal composition A-1 was continuously applied onto the support provided with the alignment film P-1. The coating film formed on the alignment film P-1 is heated to 180° C. in a heating atmosphere, then cooled to 120° C., and irradiated with ultraviolet rays of 100 mJ/cm ² at a wavelength of 365 nm using a high-pressure mercury lamp in a nitrogen atmosphere. By irradiating the film, the orientation of the liquid crystal compound was fixed, and an optical film 1 including the optically anisotropic film A-1 was produced.

―――――――――――――――――――――――――――――――――
(Polymerizable liquid crystal composition A-1)
―――――――――――――――――――――――――――――――――
・The following polymerizable liquid crystal compound L-1 42.00 parts by mass ・The following polymerizable liquid crystal compound L-2 42.00 parts by mass ・The following polymerizable liquid crystal compound L-3 16.00 parts by mass ・The following polymerization initiator PI-1 0.50 parts by mass Polymer T-1 below 0.09 parts by mass Polymer T-2 below 0.04 parts by mass Cyclopentanone 235.00 parts by mass ―――――――――――――――――――
In the structural formulas of the polymerizable liquid crystal compound L-1 and the polymerizable liquid crystal compound L-2 below, the group adjacent to the acryloyloxy group represents a propylene group (a group in which a methyl group is substituted with an ethylene group), and is polymerizable. Liquid crystal compounds L-1 and L-2 represent mixtures of positional isomers with different positions of methyl groups.

Polymerizable liquid crystal compound L-1

Polymerizable liquid crystal compound L-2

Polymerizable liquid crystal compound L-3

Polymerization initiator PI-1

Polymer T-1 (fluoroaliphatic group-containing polymer A)

Polymer T-2 (fluoroaliphatic group-containing polymer B)

[Preparation of Circularly Polarizing Plate 1]
The surface of TD80UL (manufactured by FUJIFILM Corporation) as a support was saponified with an alkali. Specifically, the support was immersed in a 1.5N sodium hydroxide aqueous solution at 55°C for 2 minutes, the support was taken out, washed in a water washing bath at room temperature, and washed with 0.1N sulfuric acid at 30°C. was neutralized using Thereafter, the obtained support was again washed in a water washing bath at room temperature and dried with hot air at 100°C.
Next, the roll-shaped polyvinyl alcohol film having a thickness of 80 μm was continuously stretched 5 times in an aqueous iodine solution, and the stretched film was dried to obtain a polarizer having a thickness of 20 μm.
The resulting polarizer and a support (TD80UL) saponified with an alkali were bonded together to obtain a polarizing plate with the polarizer exposed on one side.
Next, the longitudinal direction of the polarizing plate and the longitudinal direction of the optical film 1 are made parallel, and the exposed surface of the polarizer in the polarizing plate and the surface of the triacetyl cellulose film in the optical film 1 are bonded with a pressure-sensitive adhesive (SK -2057, manufactured by Soken Chemical Co., Ltd.).
Next, the surface of the optically anisotropic film side of the optical film 1 and the surface of the film containing the positive C plate prepared according to paragraphs [0124] to [0126] of JP-A-2015-200861 are bonded together with a pressure-sensitive adhesive. (SK-2057, manufactured by Soken Chemical Co., Ltd.), and then peeling off the temporary support for forming the positive C plate, thereby transferring only the positive C plate onto the optically anisotropic film A-1. Circularly polarizing plate 1 was produced.

[Examples 2 to 7 and Comparative Examples 1 to 3]
An optical film and a circularly polarizing plate were produced in the same manner as in Example 1, except that the polymerizable liquid crystal composition A-1 forming the optically anisotropic film 1 was changed to the composition shown in Table 1 below.

Structures of the polymerizable liquid crystal compound and the fluoroaliphatic group-containing polymer in Table 1 are shown below.

Polymerizable liquid crystal compound L-1

Polymerizable liquid crystal compound L-2

Polymerizable liquid crystal compound L-3

Polymerizable liquid crystal compound L-5

Polymerizable liquid crystal compound L-6

Polymerizable liquid crystal compound L-7

Polymerizable liquid crystal compound L-8

Polymerizable liquid crystal compound M-1

Polymerizable liquid crystal compound M-2

Polymerizable liquid crystal compound M-3

Polymer T-1 (fluoroaliphatic group-containing polymer A)

Polymer T-2 (fluoroaliphatic group-containing polymer B)

Polymer T-3 (fluoroaliphatic group-containing polymer A)

[evaluation]
The optical films and circularly polarizing plates produced in Examples 1 to 7 and Comparative Examples 1 to 3 were evaluated as follows. The results are shown in Table 2 below.

[Measurement of optical properties]
The in-plane retardation Re(450) and Re(550) of the optical film were measured using AxoScan OPMF-1 (manufactured by Optoscience). Since the triacetyl cellulose film (trade name: Z-TAC manufactured by Fuji Film) and the alignment film constituting the optical film have a front retardation value of zero, in Table 2 below, optical anisotropy It is described as an evaluation of the membrane.

[Plane]
On the optically anisotropic film side of the obtained circularly polarizing plate, a mirror-finished aluminum plate was attached using an adhesive, and the reflected light was visually observed under illumination of 500 lux. Also, the bright spots caused by the orientation defects were evaluated according to the following criteria. In Comparative Example 1, since the orientation unevenness was evaluated as D, the bright spots were not evaluated.
<Uneven Orientation>
A: Uniform quenching state without alignment unevenness (good)
B: Very slight light leakage with unclear boundaries is observed (practical level)
C: The boundary is not clear, but there is alignment unevenness that is visually recognized as clear light leakage D: There is alignment unevenness with a clear boundary, and clear light leakage is visually recognized <Bright spots>
A: Uniform extinction state without bright spots (good)
B: 1 to 5 bright spots can be seen per 10 cm square (practically possible)
C: 6 or more bright spots per 10 cm square

[OLED panel black color]
A GALAXY SIV manufactured by SAMSUNG equipped with an organic EL display panel was disassembled, the circularly polarizing plate was peeled off, and the circularly polarizing plates of Examples were each laminated on the organic EL display panel to produce an organic EL display device.
The produced organic EL display device was set to display black in a bright room, and the color of panel reflected light was visually evaluated. In Comparative Example 1, the orientation unevenness of the optically anisotropic film was evaluated as D, so no evaluation was performed.
A: When it is a neutral and tight black
B: Slightly floating black or slightly tinted black C: Clearly floating black, clearly tinted, or visible bright spots

From the results shown in Tables 1 and 2 above, it was found that when a composition containing no fluoroaliphatic group-containing polymer A was used, the formed optically anisotropic film had uneven alignment. (Comparative Example 1).
It was also found that when a composition containing no fluoroaliphatic group-containing polymer B was used, orientation defects occurred in the formed optically anisotropic film (Comparative Example 2).
It was also found that the optically anisotropic film formed did not have reverse wavelength dispersion when a polymerizable liquid crystal compound that did not exhibit reverse wavelength dispersion was used (Comparative Example 3).
On the other hand, in the case of using a polymerizable liquid crystal composition in which the polymerizable liquid crystal compound exhibiting reverse wavelength dispersion and the fluoroaliphatic group-containing polymers A and B are used in combination, the formed optically anisotropic film is uneven. It has been found that it is possible to provide an OLED display device that is free from defects in orientation and has excellent display performance during black display.

REFERENCE SIGNS LIST 10 optically anisotropic film 12 positive A plate 14 positive C plate 16 circularly polarizing plate 18 polarizer 20 organic EL display device 22 organic EL display panel

Claims (9)

An image display device having an optical film containing an optically anisotropic film or a polarizing plate containing an optically anisotropic film and a polarizer,
The optically anisotropic film is an optically anisotropic film formed from a polymerizable liquid crystal composition,
The polymerizable liquid crystal composition is
a polymerizable liquid crystal compound exhibiting reverse wavelength dispersion;
a fluoroaliphatic group-containing polymer A containing a structural unit represented by the following formula (A-1) and a structural unit derived from a fluoroaliphatic group-containing monomer;
and a fluoroaliphatic group-containing polymer B represented by the following formula ( B) ,
In the fluoroaliphatic group-containing polymer A, the content of the structural unit represented by the formula (A-1) is 25 to 80 mol% in terms of the molar ratio of all structural units, and the fluoroaliphatic group-containing monomer The content of structural units derived from is 20 to 75 mol% in terms of molar ratio with respect to all structural units,
The content of the fluoroaliphatic group-containing polymer A is 0.05 to 0.09% by mass with respect to the total solid content of the polymerizable liquid crystal composition,
The image display device , wherein the content of the fluoroaliphatic group-containing polymer B is 0.03 to 0.08% by mass relative to the total solid content of the polymerizable liquid crystal composition .

Here, in the formula (A-1),
Mp represents a trivalent group that constitutes part or all of the polymer main chain.
L represents a single bond or a divalent linking group.
X represents a substituted or unsubstituted aromatic condensed ring functional group.

Here, in the above formula (B),
i and j each independently represents an integer of 1 or more, and means that i and j types of each repeating unit are included.
M represents a repeating unit derived from an ethylenically unsaturated monomer and containing k (k is an integer of 1 or more) types.
a, b and c are mass percentages representing the polymerization ratio, Σai represents a numerical value of 10 to 35% by mass, Σbj represents a numerical value of 10 to 35% by mass, and Σck represents a numerical value of 30 to 80% by mass. .
R ¹¹ and R ¹² each independently represent a hydrogen atom or a methyl group.
X ¹ and X ² each independently represent an oxygen atom, a sulfur atom or -N(R ¹³ )-, and R ¹³ represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.
m1 and m2 each independently represent an integer of 1 to 6;
n1 represents an integer of 0 to 3; 2. The image display device according to claim 1 , wherein said fluoroaliphatic group-containing polymer A has a structural unit in which X in said formula (A-1) is a substituted or unsubstituted naphthyl group. 3. The image display device according to claim 1 , wherein in the fluoroaliphatic group-containing polymer B, the repeating unit represented by M is a repeating unit represented by the following formula (B-3).

Here, in the above formula (B-3),
R ¹ , R ² and R ³ each independently represent a hydrogen atom, an alkyl group, a halogen atom or a group represented by -LQ.
L represents a divalent linking group.
Q represents a polar group having hydrogen bonding properties. The image display device according to any one of claims 1 to 3 , wherein the mass ratio of the fluoroaliphatic group-containing polymer A and the fluoroaliphatic group-containing polymer B is 8:2 to 4:6. . The image display device according to any one of claims 1 to 4 , wherein the polymerizable liquid crystal compound is a polymerizable liquid crystal compound represented by the following formula (1).
L ¹ -SP ¹ -(E ³ -A ¹ ) _m -E ¹ -G ¹ -D ¹ -Ar ¹ -D ² -G ² -E ² -(A ² -E ⁴ ) _n -SP ² -L ² ... (1)
Here, in the above formula (1),
D ¹ , D ² , E ¹ , E ² , E ³ and E ⁴ are each independently a single bond, -CO-O-, -C(=S)O-, -CR ¹ R ² -, -CR ¹ R ² -CR ³ R ⁴ -, -O-CR ^{1 R 2 -, -CR 1 R 2 -O-CR 3 R 4 -, -CO-O-CR 1 R 2 - , -O - CO -} CR ¹ R ² -, -CR ¹ R ² -O-CO-CR ³ R ⁴ -, -CR ¹ R ² -CO-O-CR ³ R ⁴ -, -NR ¹ -CR ² R ³ -, or - represents CO-NR ¹ -. R ¹ , R ² , R ³ and R ⁴ each independently represent a hydrogen atom, a fluorine atom, or an alkyl group having 1 to 4 carbon atoms.
G ¹ and G ² each independently represent a divalent alicyclic hydrocarbon group having 5 to 8 carbon atoms which may have a substituent, and -CH constituting the alicyclic hydrocarbon group One or more of _2- may be substituted with -O-, -S- or -NH-.
A ¹ and A ² each independently represent an optionally substituted divalent aromatic hydrocarbon group having 6 to 12 carbon atoms, or an optionally substituted C 5 to represents a divalent alicyclic hydrocarbon group of 8, wherein one or more —CH ₂ — constituting the alicyclic hydrocarbon group is substituted with —O—, —S— or —NH— good.
SP ¹ and SP ² each independently constitute a single bond, a linear or branched alkylene group having 1 to 12 carbon atoms, or a linear or branched alkylene group having 1 to 12 carbon atoms. One or more of —CH ₂ — represents a divalent linking group substituted with —O—, —S—, —NH—, —N(Q)—, or —CO—, and Q is a substituent represents
L ¹ and L ² each independently represent a monovalent organic group, and at least one of L ¹ and L ² represents a polymerizable group. However, when Ar ¹ is an aromatic ring represented by the following formula (Ar-3), at least one of L ¹ and L ² and L ³ and L ⁴ in the following formula (Ar-3) is polymerizable represents a group.
m represents an integer of 0 to 2, and when m is 2, multiple E ³ may be the same or different, and multiple A ¹ may be the same or different. may
n represents an integer of 0 to 2, and when n is 2, multiple E ⁴ may be the same or different, and multiple A ² may be the same or different. may
Ar ¹ represents any aromatic ring selected from the group consisting of groups represented by the following formulas (Ar-1) to (Ar-7).

Here, in the above formulas (Ar-1) to (Ar-7),
^* represents the binding position with ^D1 or D2.
Q ¹ represents N or CH.
Q ² represents -S-, -O- or -N(R ⁵ )-, and R ⁵ represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.
Y ¹ represents an optionally substituted C 6-12 aromatic hydrocarbon group or an optionally substituted C 3-12 aromatic heterocyclic group.
Z ¹ , Z ² , Z ³ and Z ⁴ are each independently a hydrogen atom, a monovalent aliphatic hydrocarbon group having 1 to 20 carbon atoms, or a monovalent alicyclic hydrocarbon group having 3 to 20 carbon atoms , a monovalent aromatic hydrocarbon group having 6 to 20 carbon atoms, a halogen atom, a cyano group, a nitro group, —OR ⁶ , —NR ⁷ R ⁸ , or —SR ⁹ , wherein R ⁶ to R ⁹ are Each independently represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, and Z ¹ and Z ² may combine with each other to form an aromatic ring.
A ³ and A ⁴ each independently represent a group selected from the group consisting of —O—, —N(R ¹⁰ )—, —S— and —CO—, and R ¹⁰ is a hydrogen atom or represents a substituent.
X represents a hydrogen atom or a nonmetallic atom of Groups 14 to 16 which may be bonded to a substituent.
D ³ and D ⁴ are each independently a single bond, -CO-O-, -C(=S)O-, -CR ¹ R ² -, -CR ¹ R ² -CR ³ R ⁴ -, -O -CR ¹ R ² -, -CR ¹ R ² -O-CR ³ R ⁴ -, -CO-O-CR ¹ R ² -, -O-CO-CR ¹ R ² -, -CR ¹ R ² -O -CO-CR ³ R ⁴ -, -CR ¹ R ² -CO-O-CR ³ R ⁴ -, -NR ¹ -CR ² R ³ -, or -CO-NR ¹ -. R ¹ , R ² , R ³ and R ⁴ each independently represent a hydrogen atom, a fluorine atom, or an alkyl group having 1 to 4 carbon atoms.
SP ³ and SP ⁴ each independently constitute a single bond, a linear or branched alkylene group having 1 to 12 carbon atoms, or a linear or branched alkylene group having 1 to 12 carbon atoms. One or more of —CH ₂ — represents a divalent linking group substituted with —O—, —S—, —NH—, —N(Q)—, or —CO—, and Q is a substituent represents
L ³ and L ⁴ each independently represent a monovalent organic group, and at least one of L ³ and L ⁴ and L ¹ and L ² in formula (1) above represents a polymerizable group.
Ax represents an organic group having 2 to 30 carbon atoms and having at least one aromatic ring selected from the group consisting of aromatic hydrocarbon rings and aromatic heterocyclic rings.
Ay has at least one aromatic ring selected from the group consisting of a hydrogen atom, an optionally substituted alkyl group having 1 to 12 carbon atoms, or an aromatic hydrocarbon ring and an aromatic heterocyclic ring , represents an organic group having 2 to 30 carbon atoms.
The aromatic ring in Ax and Ay may have a substituent, and Ax and Ay may combine to form a ring.
Q ³ represents a hydrogen atom or an optionally substituted alkyl group having 1 to 6 carbon atoms. 6. The image display device according to claim 5 , wherein Ar ¹ in formula (1) represents a group represented by formula (Ar-1) or (Ar-2). The image display device according to any one of claims 1 to 6 , wherein the polymerizable liquid crystal composition further contains a polymerization initiator. 8. The image display device according to claim 1 , wherein the optically anisotropic film has liquid crystal molecules fixed in a homogeneous alignment. The image display device according to any one of claims 1 to 8 , wherein the optical film includes another optically anisotropic film different from the optically anisotropic film.

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