JP6970828B2 - Liquid crystal composition, optically anisotropic film, optical film, polarizing plate and image display device - Google Patents

Description

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

The liquid crystal compound exhibiting reverse wavelength dispersibility has features such as the ability to accurately convert the light wavelength over a wide wavelength range and the ability to thin the retardation film due to its high refractive index. Therefore, it is being actively researched.
Further, as a liquid crystal compound exhibiting reverse wavelength dispersibility, a T-type molecular design guideline is generally taken, and the wavelength of the major axis of the molecule is shortened and the wavelength of the minor axis located at the center of the molecule is lengthened. Is required.
Then, from the viewpoint of lengthening the wavelength of the short axis located at the center of the molecule, a hydrophilic nitrogen atom, oxygen atom, and sulfur atom are formed on the short axis skeleton (hereinafter, also referred to as "reverse wavelength dispersion expressing part"). Is known to be introduced (see, for example, Patent Documents 1 to 3).

Japanese Unexamined Patent Publication No. 2010-031223 International Publication No. 2014/010325 Japanese Unexamined Patent Publication No. 2016-081035

The present inventors have prepared an optically anisotropic film using a composition containing a liquid crystal compound exhibiting birefringence as described in Patent Documents 1 to 3 when exposed to high temperature and high humidity. After examining the problem of moist heat durability that the birefringence index changes, it became clear that there is room for improvement.

Therefore, it is an object of the present invention to provide a liquid crystal composition, an optically anisotropic film, an optical film, a polarizing plate, and an image display device used for forming an optically anisotropic film having excellent wet and heat durability.

As a result of diligent studies to achieve the above problems, the present inventors have obtained a liquid crystal composition containing a liquid crystal compound having a reverse wavelength dispersibility and a compound having a forward wavelength dispersibility and a predetermined structure. It has been found that the wet and heat durability of the formed optically anisotropic film is improved by using the film, and the present invention has been completed.
That is, it was found that the above problem can be achieved by the following configuration.

[1] A liquid crystal composition containing a liquid crystal compound having a reverse wavelength dispersibility and a compound having a forward wavelength dispersibility and represented by the formula (I) described later.
[2] The liquid crystal composition according to [1], wherein the liquid crystal compound is a compound represented by the formula (II) described later.
[3] Described in [1] or [2], wherein the compound represented by the formula (I) described later is a compound represented by any of the formulas (I-1) to (I-3) described later. Liquid crystal composition.

[4] An optically anisotropic film obtained by polymerizing the liquid crystal composition according to any one of [1] to [3].
[5] The optically anisotropic film according to [4], which satisfies the following formula (III).
0.50 <Re (450) / Re (550) <1.00 ... (III)
Here, in the formula (III), 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.
[6] An optical film having the optically anisotropic film according to [4] or [5].
[7] A polarizing plate having the optical film according to [6] and a polarizing element.
[8] An image display device having the optical film according to [6] or the polarizing plate according to [7].

According to the present invention, it is possible to provide a liquid crystal composition, an optically anisotropic film, an optical film, a polarizing plate, and an image display device used for forming an optically anisotropic film having excellent wet and heat durability.

FIG. 1A is a schematic cross-sectional view showing an example of the optical film of the present invention. FIG. 1B is a schematic cross-sectional view showing an example of the optical film of the present invention. FIG. 1C is a schematic cross-sectional view showing an example of the optical film of the present invention.

Hereinafter, the present invention will be described in detail.
The description of the constituent elements described below may be based on the representative embodiments of the present invention, but the present invention is not limited to such embodiments.
In the present specification, the numerical range represented by using "~" means a range including the numerical values before and after "~" as the lower limit value and the upper limit value.
Further, in the present specification, as each component, a substance corresponding to each component may be used alone or in combination of two or more. Here, when two or more kinds of substances are used in combination for each component, the content of the component means the total content of the substances used in combination unless otherwise specified.
Further, in the present specification, the bonding direction of the divalent group (for example, -O-CO-) described is not particularly limited unless the bonding position is specified, and for example, the formula described later (for example) When D ^{1 in} II) is -CO-O-, if the position bonded to the Ar side is * 1 and the position bonded to the G ¹ side is * 2, D ¹ is * 1-. It may be CO-O- * 2 or * 1-O-CO- * 2.

[Liquid crystal composition]
The liquid crystal composition of the present invention has a liquid crystal compound having a reverse wavelength dispersibility (hereinafter, also abbreviated as "reverse wavelength dispersible liquid crystal compound") and a forward wavelength dispersibility, and is represented by the following formula (I). It is a liquid crystal composition containing the compound (hereinafter, also abbreviated as "forward wavelength dispersible compound (I)").
R ^1- C (= O) -Cy ^1- Cy ^2- C (= O) -R ² ... (I)
Here, in the above formula (I), Cy ¹ and Cy ² represent a 1,4-cyclohexylene group which may have a substituent, and R ¹ and R ² are independent hydrogen atoms, respectively. Alternatively, it represents a substituent.

In the present invention, as described above, the moist heat durability of the optically anisotropic film formed by using the liquid crystal composition containing the forward wavelength dispersible compound (I) together with the reverse wavelength dispersible liquid crystal compound is good. It becomes.
This is not clear in detail, but the present inventor speculates as follows.
That is, it is considered that the forward wavelength dispersible compound (I) has a structure in which cyclohexane rings are connected by a single bond, so that it has a rigid molecular structure and can exhibit a high hydrophobic effect. .. Therefore, the optically anisotropic film formed from the liquid crystal composition containing the forward wavelength dispersible compound (I) together with the reverse wavelength dispersible liquid crystal compound exhibits high hydrophobicity and suppresses the infiltration of water. As a result, it is considered that the wet and heat durability is improved.
Hereinafter, each component of the liquid crystal composition of the present invention will be described in detail.

[Reverse wavelength dispersible liquid crystal compound]
The reverse wavelength dispersible liquid crystal compound contained in the liquid crystal composition of the present invention is not particularly limited as long as it is a liquid crystal compound exhibiting reverse wavelength dispersibility.
Here, the term "liquid crystal compound exhibiting reverse wavelength dispersibility" as used herein means measuring the in-plane retardation (Re) value at a specific wavelength (visible light range) of a retardation film produced using the same. When the measurement wavelength is increased, the Re value becomes equal or higher.
On the other hand, the "compound exhibiting forward wavelength dispersibility" is the measured wavelength when the in-plane retardation (Re) value at a specific wavelength (visible light range) of a retardation film produced using the compound is measured. The Re value decreases as the value increases.

The type of the liquid crystal compound exhibiting reverse wavelength dispersibility is not particularly limited, but can be classified into a rod-shaped type (rod-shaped liquid crystal compound) and a disk-shaped type (disk-shaped liquid crystal compound) according to the shape. Furthermore, there are a small molecule type and a high molecular type, respectively. A polymer generally refers to a molecule having a degree of polymerization of 100 or more (Polymer Physics / Phase Transition Dynamics, Masao Doi, p. 2, Iwanami Shoten, 1992).
In the present invention, any liquid crystal compound can be used. Two or more kinds of rod-shaped liquid crystal compounds, two or more kinds of disk-shaped liquid crystal compounds, or a mixture of a rod-shaped liquid crystal compound and a disk-shaped liquid crystal compound may be used.

In the present invention, the reverse wavelength dispersible liquid crystal compound is used because the reverse wavelength dispersibility of the reverse wavelength dispersible liquid crystal compound is further improved and the wet heat durability of the formed optically anisotropic film is further improved. , The compound represented by the following formula (II) is preferable.
L ^1- SP ^1- (D ^5- A ^1- D ^3- G ^1- D ^1- Ar-D ² ) _m- G ^2- D ^4- A ^2- D ^6- SP ^2- L ² ... ( II)

In the above formula (II), m represents an integer of 1 to 10. When m is an integer of 2 to 10, each symbol that will be present in a plurality of symbols in the equation may be the same or different.
Further, in the above formula (II), D ¹ , D ² , D ³ , D ⁴ , D ⁵ and D ⁶ are independently single-bonded or -CO-, -O-, -S-,-, respectively. ^{C (= S) -, -} CR 1 R 2 -, - CR 3 = CR 4 -, - NR 5 -, or a divalent linking group formed from these two or more ^thereof, R 1 to R ⁵ independently represents a hydrogen atom, a fluorine atom, or an alkyl group having 1 to 4 carbon atoms.
Further, in the above formula (II), 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 are alicyclic. _{One or more of -CH 2-} constituting the hydrocarbon group may be substituted with -O-, -S- or -NH-.
Further, in the above formula (II), A ¹ and A ² each independently have an aromatic ring having 6 or more carbon atoms which may have a substituent or a carbon number which may have a substituent. Represents 6 or more cycloalkane rings.
Further, in the above formula (II), SP ¹ and SP ² are independently single-bonded, a linear or branched alkylene group having 1 to 12 carbon atoms, or a linear chain having 1 to 12 carbon atoms. Alternatively, a divalent linkage in which _{one or more of -CH 2-} constituting the branched alkylene group is substituted with -O-, -S-, -NH-, -N (Q)-, or -CO-. Represents a group and Q represents a substituent.
Further, in the above formula (II), 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 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 a polymerizable group.} Represents.

In the above formula (II), m represents an integer of 1 to 10, preferably an integer of 1 to 5, more preferably 1 or 2, and even more preferably 1.
As described above, when m is an integer of 2 to 10, each symbol that is present in a plurality in the above equation (II) may be the same or different. Specifically, for example, when m is 2, the formula (II) 2 pieces of A ¹ present in may be one different even the same.

In the above formula (II), ^{as the divalent linking group represented by D 1} , D ² , D ³ , D ⁴ , D ⁵ and D ⁶ , for example, -CO-, -O-, -CO-O-, ^{-C (= S) O -,} - CR 1 R 2 -, - CR 1 R 2 -CR 1 R 2 -, - O-CR 1 R 2 -, - CR 1 R 2 -O-CR 1 R 2 - ^{, -CO-O-CR 1 R} 2 -, - O-CO-CR 1 R 2 -, - CR 1 R 2 -O-CO-CR 1 R 2 -, - CR 1 R 2 -CO-O-CR Examples ^{thereof include 1} R ² −, −NR ^{5 −CR 1} R ² −, and −CO −NR ⁵ −. R ¹ , R ² and R ⁵ each independently represent a hydrogen atom, a fluorine atom, or an alkyl group having 1 to 4 carbon atoms.
Of these, any of -CO-, -O-, and -CO-O- is preferable.

In the above formula (II), the ^{divalent alicyclic hydrocarbon group having 5 to 8 carbon atoms represented by G 1} and G ² is preferably a 5-membered ring or a 6-membered ring. The alicyclic hydrocarbon group may be saturated or unsaturated, but a saturated alicyclic hydrocarbon group is preferable. As the ^{divalent alicyclic hydrocarbon group represented by G 1} and G ² , for example, the description in paragraph [0078] of JP2012-21068A can be referred to, and the content thereof is incorporated in the present specification. ..

Further, in the above formula (II), for G ¹ and G ² , examples of the substituent that the divalent alicyclic hydrocarbon group having 5 to 8 carbon atoms may have include an alkyl group and an alkoxy group. , Halogen atoms and the like.
As the alkyl group, for example, a linear, branched or cyclic alkyl group having 1 to 18 carbon atoms is preferable, and an alkyl group having 1 to 8 carbon atoms (for example, a methyl group, an ethyl group, a propyl group or an isopropyl group) is preferable. , N-butyl group, isobutyl group, sec-butyl group, t-butyl group, cyclohexyl group, etc.) is more preferable, and an alkyl group having 1 to 4 carbon atoms is further preferable, and a methyl group or an ethyl group is used. Is particularly preferable.
As the alkoxy group, for example, an alkoxy group having 1 to 18 carbon atoms is preferable, an alkoxy group having 1 to 8 carbon atoms (for example, a methoxy group, an ethoxy group, an n-butoxy group, a methoxyethoxy group, etc.) is more preferable, and carbon. It is more preferably an alkoxy group having a number of 1 to 4, and particularly preferably a methoxy group or an ethoxy group.
Examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, an iodine atom and the like, and among them, a fluorine atom and a chlorine atom are preferable.

In the above formula (II) ^{, examples of the aromatic ring having 6 or more carbon atoms represented by A 1} and A ² include an aromatic hydrocarbon ring such as a benzene ring, a naphthalene ring, an anthracene ring, and a phenanthroline ring; a furan ring. Aromatic heterocycles such as a pyrrole ring, a thiophene ring, a pyridine ring, a thiazole ring, and a benzothiazole ring; Of these, a benzene ring (for example, a 1,4-phenyl group) is preferable.
Further, in the above formula (II) ^{, examples of the cycloalkane ring having 6 or more carbon atoms represented by A 1} and A ² include a cyclohexane ring, a cyclopeptane ring, a cyclooctane ring, a cyclododecane ring, and a cyclododecane ring. Of these, a cyclohexane ring (for example, a 1,4-cyclohexylene group) is preferable, and a trans-1,4-cyclohexylene group is more preferable.
Regarding A ¹ and A ^{2 , G 1} and G ² in the above formula (II) are examples of substituents that the aromatic ring having 6 or more carbon atoms or the cycloalkane ring having 6 or more carbon atoms may have. Examples include the same substituents that may have.

In the above formula (II) ^{, examples of the linear or branched alkylene group having 1 to 12 carbon atoms represented by SP 1} and SP ² include a methylene group, an ethylene group, a propylene group, a butylene group, a pentylene group and a hexylene. Preferred examples include a group, a methylhexylene group, a heptylene group and the like. As described above, in SP ¹ and SP ² _{, one or more of -CH 2-} constituting a linear or branched alkylene group having 1 to 12 carbon atoms are -O-, -S-, and -NH. -, - N (Q) - , or it may be a divalent linking group which is substituted in -CO-, as the substituents represented by Q, ^{G 1} and G in the formula (II) Examples thereof include the same substituents that ^{2 may have.}

^{Examples of the monovalent organic group represented by L 1} and L ² in the above formula (II) include an alkyl group, an aryl group, and a heteroaryl group. The alkyl group may be linear, branched or cyclic, but linear is preferred. The number of carbon atoms of the alkyl group is preferably 1 to 30, more preferably 1 to 20, and even more preferably 1 to 10. The aryl group may be monocyclic or polycyclic, but monocyclic is preferable. The aryl group preferably has 6 to 25 carbon atoms, more preferably 6 to 10 carbon atoms. Further, the heteroaryl group may be monocyclic or polycyclic. The number of heteroatoms constituting the heteroaryl group is preferably 1 to 3. As the hetero atom constituting the heteroaryl group, a nitrogen atom, a sulfur atom and an oxygen atom are preferable. The heteroaryl group preferably has 6 to 18 carbon atoms, more preferably 6 to 12 carbon atoms. Further, the alkyl group, the aryl group and the heteroaryl group may be unsubstituted or may have a substituent. Examples of the substituent include the same substituents that G ¹ and G ² in the above formula (II) may have.

In the above formula (II), the ^{polymerizable group represented by at least one of L 1} and L ² is not particularly limited, but a polymerizable group capable of radical polymerization or cationic polymerization is preferable.
As the radically polymerizable group, a generally known radically polymerizable group can be used, and suitable examples thereof include an acryloyl group and a methacryloyl group. In this case, it is known that the acryloyl group is generally faster in terms of the polymerization rate, and the acryloyl group is preferable from the viewpoint of improving productivity, but the methacryloyl group can also be used as the polymerizable group in the same manner.
As the cationically polymerizable group, a generally known cationically polymerizable group can be used, and specifically, an alicyclic ether group, a cyclic acetal group, a cyclic lactone group, a cyclic thioether group, a spiroorthoester group, and , Vinyloxy group and the like. Of these, 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 preferable polymerizable groups include the following.

^{In the above formula (II), it is preferable that both L 1} and L ² in the above formula (II) are polymerizable groups, and are preferably acryloyl groups or methacryloyl groups, for the reason that the durability is good. More preferred.

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

In the above formula (Ar-1), Q ¹ represents N or CH, Q ² represents -S-, -O-, or -N (R ⁶ )-, and R ⁶ is a hydrogen atom or Representing an alkyl group having 1 to 6 carbon atoms, Y ¹ represents an aromatic hydrocarbon group having 6 to 12 carbon atoms or an aromatic heterocyclic group having 3 to 12 carbon atoms, which may have a substituent. show.
Specific examples of the alkyl group having 1 to 6 carbon atoms indicated by R ⁶ include a methyl group, an ethyl group, a propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a sec-butyl group and a tert-butyl group. Groups, n-pentyl groups, n-hexyl groups and the like can be mentioned.
Examples of the aromatic hydrocarbon group having 6 to 12 carbon atoms indicated by Y ¹ include an aryl group such as a phenyl group, a 2,6-diethylphenyl group and a naphthyl group.
Examples of the aromatic heterocyclic group having 3 to 12 carbon atoms indicated by Y ¹ include heteroaryl groups such as a thienyl group, a thiazolyl group, a frill group and a pyridyl group.
Further, examples of the ^{substituent that Y 1} may have include the same substituents that G ¹ and G ^{2 in the above formula (II) may have.}

Further, in the above formulas (Ar-1) to (Ar-5), Z ¹ , Z ² and Z ³ are independently hydrogen atoms, monovalent aliphatic hydrocarbon groups having 1 to 20 carbon atoms, and carbon. A monovalent alicyclic hydrocarbon group having a number of 3 to 20, a monovalent aromatic hydrocarbon group having 6 to 20 carbon atoms, a halogen atom, a cyano group, a nitro group, -OR ⁷ , -NR ⁸ R ⁹ , or , -SR ¹⁰ and R ^{7 to} R ¹⁰ each independently represent a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, and Z ¹ and Z ² may be bonded to each other to form an aromatic ring. good.
As the monovalent aliphatic hydrocarbon group having 1 to 20 carbon atoms, an alkyl group having 1 to 15 carbon atoms is preferable, an alkyl group having 1 to 8 carbon atoms is more preferable, and specifically, a methyl group and an ethyl group. , Isopropyl group, tert-pentyl group (1,1-dimethylpropyl group), tert-butyl group, 1,1-dimethyl-3,3-dimethyl-butyl group are more preferable, and methyl group, ethyl group, tert-butyl group. Groups are particularly preferred.
Examples of the monovalent alicyclic hydrocarbon group having 3 to 20 carbon atoms include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, a cyclodecyl group, a methylcyclohexyl group and an ethylcyclohexyl. Monocyclic saturated hydrocarbon groups such as groups; cyclobutenyl group, cyclopentenyl group, cyclohexenyl group, cycloheptenyl group, cyclooctenyl group, cyclodecenyl group, cyclopentadienyl group, cyclohexadienyl group, cyclooctadienyl group, cyclodeca Monocyclic unsaturated hydrocarbon groups such as diene; bicyclo [2.2.1] heptyl group, bicyclo [2.2.2] octyl group, tricyclo [5.2.2.10 ^2,6 ] decyl group, Tricyclo [3.3.1.1 ^3,7 ] decyl group, tetracyclo [6.2.1.1 ^3,6 . 0 ^2,7 ] Polycyclic saturated hydrocarbon groups such as dodecyl group and adamantyl group; and the like.
Specific examples of the monovalent aromatic hydrocarbon group having 6 to 20 carbon atoms include a phenyl group, a 2,6-diethylphenyl group, a naphthyl group, a biphenyl group and the like, and 6 to 12 carbon atoms. Aryl groups (particularly phenyl groups) are preferred.
Examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, an iodine atom and the like, and among them, a fluorine atom, a chlorine atom and a bromine atom are preferable.
On the other hand, ^{examples of the alkyl group having 1 to 6 carbon atoms indicated by R 7 to} R ¹⁰ include, for example, a methyl group, an ethyl group, a propyl group, an isopropyl group, an n-butyl group, an isobutyl group, and sec-butyl. Groups, tert-butyl group, n-pentyl group, n-hexyl group and the like can be mentioned.

Further, in the above formula (Ar-2) and ^{(Ar-3), A} 3 and ^{A 4} are each ^{independently, -O -, - N (R} 11) -, - S-, and from -CO- Represents a group selected from the group, where R ¹¹ represents a hydrogen atom or a substituent.
Examples of the substituent represented by R ^{11 include the same substituents that G 1} and G ² in the above formula (II) may have.

Further, in the above formula (Ar-2), X represents a non-metal atom of Group 14 to 16 to which a hydrogen atom or a substituent may be bonded.
Examples of the non-metal atoms of Groups 14 to 16 indicated by X include an oxygen atom, a sulfur atom, a nitrogen atom having a substituent, and a carbon atom having a substituent. Specific examples of the substituent include 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 (for example, 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. Can be mentioned.

Further, in the above formula (Ar-3), D ⁷ and D ⁸ are independently single-bonded or -CO-, -O-, -S-, -C (= S)-, -CR ^{1 respectively. R 2 -, - CR 3 =} CR 4 -, - NR 5 -, or a divalent linking group formed from these two or more ^thereof, R 1 to R ⁵ are each independently a hydrogen atom, It represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.
Here, examples of the divalent linking group include those described in D ¹ , D ² , D ³ , D ⁴ , D ⁵ and D ^{6 in the above formula (II).}

Further, in the above formula (Ar-3), SP ³ and SP ⁴ are independently single-bonded, a linear or branched alkylene group having 1 to 12 carbon atoms, or a direct group having 1 to 12 carbon atoms. _{Divalent in which one or more of -CH 2-} constituting the chain or branched alkylene group is substituted with -O-, -S-, -NH-, -N (Q)-, or -CO-. Represents a linking group of, and Q represents a substituent. Examples of the substituent include the same substituents that G ¹ and G ² in the above formula (II) may have.
Here, examples of the alkylene group include the same groups as those described in ^{SP 1} and SP ^{2 in the above formula (II).}

Further, in the above formula (Ar-3), L ³ and L ⁴ independently represent monovalent organic groups, respectively, and at least 1 of ^{L 3} and L ^{4 and L 1} and L ^{2 in} the above formula (II). One represents a polymerizable group.
Examples of the monovalent organic group include the same groups as those described in ^{L 1} and L ^{2 in the above formula (II).}
Further, the polymerizable group include the same as those described in L ¹ and L ² in the formula (II).

Further, in the above formulas (Ar-4) to (Ar-5), Ax has at least one aromatic ring selected from the group consisting of an aromatic hydrocarbon ring and an aromatic heterocycle, and has 2 to 30 carbon atoms. Represents an organic group.
Further, in the above formulas (Ar-4) to (Ar-5), Ay is a hydrogen atom, an alkyl group having 1 to 12 carbon atoms which may have a substituent, or an aromatic hydrocarbon ring and an aromatic. Represents an organic group having 2 to 30 carbon atoms and having at least one aromatic ring selected from the group consisting of group heterocycles.
Here, the aromatic ring in Ax and Ay may have a substituent, or Ax and Ay may be bonded to form a ring.
Further, Q ³ represents a hydrogen atom or may have a substituent alkyl group having 1 to 6 carbon atoms.
Examples of Ax and Ay include those described in paragraphs [0039] to [0995] of Patent Document 2 (International Publication No. 2014/010325).
Specific examples of the alkyl group having 1 to 6 carbon atoms shown in Q ³ include a methyl group, an ethyl group, a propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a sec-butyl group, and a tert. -Butyl group, n-pentyl group, n-hexyl group and the like can be mentioned, and examples of the substituent are the same as the substituents that G ¹ and G ² in the above formula (II) may have. Can be mentioned.

Specific examples of the back-dispersible liquid crystal compound represented by the above formula (II) include compounds represented by the general formula (1) described in JP-A-2010-084032 (particularly, paragraph number []. 0067] to [0073], compounds represented by the general formula (II) described in JP-A-2016-053709 (particularly, compounds described in paragraph numbers [0036] to [0043]). Examples thereof include compounds represented by the general formula (1) described in JP-A-2016-081035 (particularly, compounds described in paragraph numbers [0043] to [0055]).

In the present invention, for the reason that the reverse wavelength dispersibility is improved, m in the above formula (II) represents 1, and A ¹ and A ² in the above formula (II) have independent carbon atoms. It is preferably a polymerizable liquid crystal compound representing 6 or more cycloalkane rings, in which m in the above formula (II) represents ^1, and A ^{1 and A 2} in the above formula (II) are independently carbon. It is more preferable that ^{D 3} and D ⁴ in the above formula (II) are polymerizable liquid crystal compounds representing a cycloalkane ring of number 6 or more and representing a single bond.
Examples of such a polymerizable liquid crystal compound preferably include compounds represented by the following formulas (1) to (12), and specifically, K (specifically, K (1) to (12) in the following formulas (1) to (12). Examples of the side chain structure) include compounds having the side chain structures shown in Tables 1 and 2 below.
In Tables 1 and 2 below, "*" shown in the side chain structure of K represents the bonding position with the aromatic ring.
Further, in the following description, the compound represented by the following formula (1) and having the group shown in 1-1 in Table 1 below is referred to as "compound (1-1-1)" and is described as another compound. Compounds having a structural formula and a group are also described in the same manner. For example, a compound represented by the following formula (2) and having a group shown in 2-3 in Table 2 below can be expressed as "compound (2-2-3)".
Further, in the side chain structure represented by 1-2 in Table 1 below and 2-2 in Table 2 below, the group adjacent to the acryloyloxy group and the methacryloyl group is a propylene group (methyl group becomes an ethylene group, respectively). Represents a substituted group) and represents a mixture of positional isomers with different methyl group positions.

In the present invention, for the reason that the reverse wavelength dispersibility is improved, m in the above formula (II) represents an integer of 2 to 10, and A ¹ and A ² in the above formula (II) are independent of each other. In addition, it is preferably a polymerizable liquid crystal compound representing a cycloalkane ring having 6 or more carbon atoms, and m in the above formula (II) represents an integer of 2 to 10 and A ^{1 and A in the above formula (II). It} is more preferable that 2 independently represents a cycloalkane ring having 6 or more carbon atoms, and D ³ and D ⁴ in the above formula (II) are all polymerizable liquid crystal compounds representing a single bond. ..
Specific examples of such a polymerizable liquid crystal compound include the compounds shown below. In addition, m in the structural formula in the following examples represents an integer of 2 to 10.

[Forward wavelength dispersible compound (I)]
The forward wavelength dispersible compound (I) contained in the liquid crystal composition of the present invention is a compound represented by the following formula (I).
R ^1- C (= O) -Cy ^1- Cy ^2- C (= O) -R ² ... (I)

In the above formula (I), Cy ¹ and Cy ² represent a 1,4-cyclohexylene group which may have a substituent.
Regarding Cy ¹ and Cy ² , the substituents that the 1,4-cyclohexylene group may have are the substituents that G ¹ and G ^{2 in} the above-mentioned formula (II) may have. The same can be mentioned.

Further, in the above formula (I), R ¹ and R ² independently represent a hydrogen atom or a substituent (hereinafter, also abbreviated as “substituent R”).

The substituent R may be, for example, specifically, for example, for example.
Alkyl groups (preferably straight chain with 1 to 30 carbon atoms, branched or unsubstituted alkyl groups such as methyl group, ethyl group, n-propyl group, isopropyl group, tert-butyl group, n-octyl group, 2-Ethylhexyl group);
An alkenyl group (preferably a substituted or unsubstituted alkenyl group having 2 to 30 carbon atoms, for example, a vinyl group or an allyl group);
An alkynyl group (preferably a substituted or unsubstituted alkynyl group having 2 to 30 carbon atoms, for example, an ethynyl group or a propargyl group);
Aryl groups (preferably substituted or unsubstituted aryl groups having 6 to 30 carbon atoms, such as phenyl group, p-tolyl group, naphthyl group);
Heterocyclic group (preferably a 5- or 6-membered substituted or unsubstituted, aromatic or non-aromatic heterocyclic compound from which one hydrogen atom has been removed, more preferably from 3 to 3 carbon atoms. 30 5- or 6-membered aromatic heterocyclic groups such as 2-furyl group, 2-thienyl group, 2-pyrimidinyl group, 2-benzothiazolyl group);
Hydroxy group;
Alkoxy groups (preferably substituted or unsubstituted alkoxy groups having 1 to 30 carbon atoms, for example, methoxy group, ethoxy group, isopropoxy group, tert-butoxy group, n-octyloxy group, 2-methoxyethoxy group);
Aryloxy groups (preferably substituted or unsubstituted aryloxy groups having 6 to 30 carbon atoms, such as phenoxy group, 2-methylphenoxy group, 4-tert-butylphenoxy group, 3-nitrophenoxy group, 2-tetra. Decanoylaminophenoxy group);
A silyloxy group (preferably a silyloxy group having 3 to 20 carbon atoms, for example, a trimethylsilyloxy group, a tert-butyldimethylsilyloxy group);
Heterocyclic oxy group (preferably a substituted or unsubstituted heterocyclic oxy group having 2 to 30 carbon atoms, 1-phenyltetrazole-5-oxy group, 2-tetrahydropyranyloxy group);
Amino groups (preferably amino groups, substituted or unsubstituted alkylamino groups having 1 to 30 carbon atoms, substituted or unsubstituted anilino groups having 6 to 30 carbon atoms, such as amino groups, methylamino groups and dimethylamino groups. , Anilino group, N-methyl-anilino group, diphenylamino group);
Mercapto group;
Alkylthio groups (preferably substituted or unsubstituted alkylthio groups having 1 to 30 carbon atoms, such as methylthio groups, ethylthio groups, n-hexadecylthio groups);
Arylthio groups (preferably substituted or unsubstituted arylthio groups having 6 to 30 carbon atoms, for example, phenylthio groups, p-chlorophenylthio groups, m-methoxyphenylthio groups);
Heterocyclic thiogroups (preferably substituted or unsubstituted heterocyclic thiogroups having 2 to 30 carbon atoms, such as 2-benzothiazolylthio group, 1-phenyltetrazole-5-ylthio group);
And so on.

Among the above-mentioned substituents R, those having a hydrogen atom may be removed and further substituted with a substituent.
Examples of such substituents are halogen atom, alkyl group, alkenyl group, aryl group, heterocyclic group, cyano group, hydroxyl group, carboxyl group, alkoxy group, aryloxy group, silyloxy group, heterocyclic oxy group, Acyloxy group, carbamoyloxy group, alkoxycarbonyloxy group, aryloxycarbonyloxy group, amino group, acylamino group, aminocarbonylamino group, alkoxycarbonylamino group, aryloxycarbonylamino group, sulfamoylamino group, alkyl or arylsulfonyl Amino group, mercapto group, alkylthio group, arylthio group, heterocyclic thio group, sulfamoyl group, sulfo group, alkyl or arylsulfinyl group, alkyl or arylsulfonyl group, acyl group, aryloxycarbonyl group, alkoxycarbonyl group, carbamoyl group, Examples thereof include an imide group, a phosphino group, a phosphinyl group, a phosphinyloxy group, a phosphinylamino group and a silyl group.
Further, an embodiment in which a polymerizable group capable of radical polymerization or cationic polymerization is substituted is also preferable. As the radically polymerizable group, a generally known radically polymerizable group can be used, and suitable examples thereof include an acryloyl group and a methacryloyl group. As the cationically polymerizable group, a generally known cationically polymerizable group can be used, and specifically, an alicyclic ether group, a cyclic acetal group, a cyclic lactone group, a cyclic thioether group, a spiroorthoester group, and , Vinyloxy group and the like. Of these, an alicyclic ether group or a vinyloxy group is preferable, and an epoxy group, an oxetanyl group, or a vinyloxy group is particularly preferable.

Of these, the substituent R is preferably a hydroxyl group, an alkoxy group, an aryloxy group, a heterocyclic oxy group, an amino group, an alkylthio group, an arylthio group, or a heterocyclic thio group, preferably a hydroxyl group, an alkoxy group, or the like. It is more preferably an aryloxy group or an amino group.

In the present invention, the aspect ratio of the molecule is increased, and the order can be jointly oriented with the above-mentioned inverse wavelength-dispersible liquid crystal compound without impairing the liquidity of the above-mentioned inverse wavelength-dispersible liquid crystal compound. The wavelength-dispersible compound (I) is preferably a compound represented by any of the following formulas (I-1) to (I-3).
L ^11- SP ^11- D ^11- C (= O) -Cy ^1- Cy ^2- C (= O) -D ^12- SP ^12- L ¹² ... (I-1)
^{L 11 -SP 11 - (D 13} -A 11) p -D 11 -C (= O) -Cy 1 -Cy 2 -C (= O) -D 12 - (A 12 -D 14) q -SP 12 -L ¹² ... (I-2)
L ¹¹ -SP ¹¹ -D ¹¹ - ^{[C (= O) -Cy 1 -Cy} 2 -C (= O) -D 15 - (A 13 -D 16) r ] _n -C (= O) -Cy ¹ -Cy ^2- C (= O) -D ^12- SP ^12- L ¹² ... (I-3)

In the above equation (I-2), p represents an integer of 1 to 3 and q represents an integer of 1 to 3. P and q are preferably 1 or 2 from the viewpoint of the crystallinity of the obtained forward wavelength dispersible compound (I) and the compatibility with the above-mentioned reverse wavelength dispersible liquid crystal compound. It is more preferably 1.
Further, in the above equation (I-3), r represents an integer of 1 to 3 and n represents an integer of 1 to 10. r is preferably 1 or 2, more preferably 1. n is preferably an integer of 2 to 10, and more preferably an integer of 2 to 5.
When p is 2 or 3, q is 2 or 3, r is 2 or 3, or n is an integer of 2 to 10, there are a plurality of them in the equation. Each symbol that becomes may be the same or different. Specifically, for example, when p is 2, two A ¹¹ present in the above formula (I-2), or may be different even the same.

Further, in the above formulas (I-1) to (I-3), Cy ¹ and Cy ² represent a 1,4-cyclohexylene group which may have a substituent.
Regarding Cy ¹ and Cy ² , the substituents that the 1,4-cyclohexylene group may have are the substituents that G ¹ and G ^{2 in} the above-mentioned formula (II) may have. The same can be mentioned.

Further, in the above formulas (I-1) to (I-3), D ¹¹ , D ¹² , D ¹³ , D ¹⁴ , D ¹⁵ and D ¹⁶ are independently single-bonded or −CO−, −, respectively. O -, - S -, - C (= S) -, - CR 1 R 2 -, - CR 3 = CR 4 -, - NR 5 -, or a divalent linking of consisting of two or more thereof Representing a group, R ^{1 to} R ⁵ independently represent a hydrogen atom, a fluorine atom, or an alkyl group having 1 to 4 carbon atoms.
Here, examples of the divalent linking group include those described in D ¹ , D ² , D ³ , D ⁴ , D ⁵ and D ^{6 in the above-mentioned formula (II).}

Further, in the above formulas (I-1) to (I-3), SP ¹¹ and SP ¹² are independently single-bonded, linear or branched alkylene groups having 1 to 12 carbon atoms, or carbon. _{One or more of -CH 2-} constituting the linear or branched alkylene group of the number 1 to 12 is -O-, -S-, -NH-, -N (Q)-, or -CO-. Represents a divalent linking group substituted with, and Q represents a substituent.
Here, examples of the alkylene group include the same groups as those described in ^{SP 1} and SP ^{2 in the above-mentioned formula (II).}

Further, in the above formulas (I-1) to (I-3), L ¹¹ and L ¹² each independently represent a monovalent hydrogen atom or a polymerizable group.
Examples of the polymerizable group include the same as those described in L ¹ and L ² in the above-mentioned formula (II).

Further, the above formula (I-2) and in ^{(I-3), A 11} , A 12 and ^{A 13} are ^members independently aromatic ring or carbon atoms 6 may have a substituent group, or It represents a divalent alicyclic hydrocarbon group having 5 to 8 carbon atoms which may have a substituent, and _{one or more of −CH 2} − constituting the alicyclic hydrocarbon group is −O−, −. It may be substituted with S- or -NH-.
Here, the aromatic ring which may having 6 or more carbon atoms have a substituent include the same as those described in A ¹ and A ² in the above-mentioned formula (II).
The divalent alicyclic hydrocarbon group which may carbons 5-8 may have a substituent, the same ones as described in the G ¹ and G ² in the above formula (II) Can be mentioned.
Further, A ¹¹ , A ¹² and A ¹³ are a group consisting of groups represented by the following formulas (A2-1) to (A2-5) because of their excellent molecular rigidity and hydrophobicity (durability). It is preferable to represent any ring structure selected from.

In the above formulas (A2-1) to (A2-5), * represents a bonding position with D.
Further, R ²¹ represents a substituent, r 21 represents an integer of 0 to 4, preferably an integer of 0 to 2, and more preferably 0 or 1.
Further, R ²² represents a substituent, r 22 represents an integer of 0 to 6, preferably an integer of 0 to 2, and more preferably 0 or 1.
Further, R ²³ represents an alkyl group having 1 to 5 carbon atoms, r 23 represents an integer of 0 to 8, preferably an integer of 0 to 4, and more preferably an integer of 0 to 2. , 0 or 1, more preferably.

^{Examples of the substituent represented by R 21} in the above formula (A2-1) ^{and R 22} in the above formula (A2-2) include an alkyl group, an alkoxy group, a halogen atom, a cyano group, and an alkoxycarbonyl group. Can be mentioned.
As the alkyl group, for example, a linear, branched or cyclic alkyl group having 1 to 18 carbon atoms is preferable, and an alkyl group having 1 to 8 carbon atoms (for example, a methyl group, an ethyl group, a propyl group or an isopropyl group) is preferable. , N-butyl group, isobutyl group, sec-butyl group, t-butyl group, cyclohexyl group, etc.) is more preferable, and an alkyl group having 1 to 4 carbon atoms is further preferable, and a methyl group or an ethyl group is used. Is particularly preferable.
As the alkoxy group, for example, an alkoxy group having 1 to 18 carbon atoms is preferable, an alkoxy group having 1 to 8 carbon atoms (for example, a methoxy group, an ethoxy group, an n-butoxy group, a methoxyethoxy group, etc.) is more preferable, and carbon. It is more preferably an alkoxy group having a number of 1 to 4, and particularly preferably a methoxy group or an ethoxy group.
Examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, an iodine atom and the like, and among them, a fluorine atom and a chlorine atom are preferable.
Examples of the alkoxycarbonyl group include a substituted or unsubstituted alkoxycarbonyl group, and as the unsubstituted alkoxycarbonyl group, for example, an alkoxycarbonyl group having 1 to 18 carbon atoms is preferable, and an alkoxycarbonyl group having 1 to 8 carbon atoms (1 to 8 carbonyl groups). For example, a methoxycarbonyl group, an ethoxycarbonyl group, an n-butoxycarbonyl group, etc.) are more preferable. As the substituted alkoxycarbonyl group, for example, an alkoxycarbonyl group substituted with a polymerizable group such as an acrylicoxybutoxycarbonyl group is preferable.

In the above formulas (A2-3) to (A2-5), ^{the alkyl group having 1 to 5 carbon atoms represented by R 23} is specifically, for example, a methyl group, an ethyl group, a propyl group, an isopropyl group, or n. -A butyl group and the like can be mentioned.

Specific examples of the compound represented by the above formula (I-1) include the compounds shown below.

Specific examples of the compound represented by the above formula (I-2) include the compounds shown below.

Specific examples of the compound represented by the above formula (I-3) include the compounds shown below.

In the present invention, the content of the forward wavelength dispersible compound (I) is preferably 0.5 to 100 parts by mass, preferably 1 to 50 parts by mass with respect to 100 parts by mass of the above-mentioned reverse wavelength dispersible liquid crystal compound. It is more preferably parts, and even more preferably 2 to 50 parts by mass.

[Polymerization initiator]
The liquid crystal composition of the present 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 the photopolymerization initiator include α-carbonyl compounds (described in US Pat. Nos. 2,376,661 and 236,670), acidoin ethers (described in US Pat. No. 2,448,828), and α-hydrogen-substituted fragrances. Group acidloin compounds (described in US Pat. No. 2,725,512), polynuclear quinone compounds (described in US Pat. Nos. 3,46127 and 2951758), combinations of triarylimidazole dimers and p-aminophenyl ketone (US patent). 3549365 (described in US Pat. No. 3,549,67), aclysine and phenazine compounds (Japanese Patent Laid-Open No. 60-105667, US Pat. No. 4,239,850), oxadiazole compounds (described in US Pat. No. 421,970), acylphosphine. Examples thereof include oxide compounds (described in Japanese Patent Application Laid-Open No. 63-40799, Japanese Patent Application Laid-Open No. 5-29234, Japanese Patent Application Laid-Open No. 10-95788, Japanese Patent Application Laid-Open No. 10-29997) and the like.
Further, in the present invention, it is also preferable that the polymerization initiator is an oxime-type polymerization initiator, and specific examples thereof are described in paragraphs [0049] to [0052] of International Publication No. 2017/170443. Agents are mentioned.

〔solvent〕
The 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 the solvent include ketones (eg, acetone, 2-butanone, methylisobutylketone, cyclohexanone, cyclopentanone, etc.), ethers (eg, dioxane, tetrahydrofuran, etc.), and aliphatic hydrocarbons. (Eg, hexane, etc.), alicyclic hydrocarbons (eg, cyclohexane, etc.), aromatic hydrocarbons (eg, toluene, xylene, trimethylbenzene, etc.), carbon halides (eg, dichloromethane, dichloroethane, dichlorobenzene, etc.) , Chlorotoluene, etc.), esters (eg, methyl acetate, ethyl acetate, butyl acetate, etc.), water, alcohols (eg, ethanol, isopropanol, butanol, cyclohexanol, etc.), cellosolves (eg, methyl cellosolve, ethyl cellosolve, etc.) , Etc.), cellosolve acetates, sulfoxides (eg, dimethyl sulfoxide, etc.), amides (eg, dimethylformamide, dimethylacetamide, etc.), etc., and these may be used alone or in combination of two or more. You may.

[Leveling agent]
The liquid crystal composition of the present invention preferably contains a leveling agent from the viewpoint of keeping the surface of the optically anisotropic film smooth and facilitating orientation control.
As such a leveling agent, a fluorine-based leveling agent or a silicon-based leveling agent is preferable because it has a high leveling effect on the amount of addition, and a fluorine-based leveling agent is less likely to cause crying (bloom, bleed). Is more preferable.
Specific examples of the leveling agent include the compounds described in paragraphs [0079] to [0102] of JP-A-2007-069471, and the general formulas described in JP-A-2013-047204. The compound represented by I) (particularly the compound described in paragraphs [0020] to [0032]) and the compound represented by the general formula (I) described in JP-A-2012-211306 (particularly [0022]. -The compound described in paragraph [0029], the liquid crystal alignment promoter represented by the general formula (I) described in JP-A-2002-129162 (particularly [0076] to [0078] and [0082]- Compounds described in paragraph [0084], compounds represented by the general formulas (I), (II) and (III) described in JP-A-2005-09924 (particularly paragraphs [0092] to [00906]. The compounds described in 1) and the like. In addition, it may also have a function as an orientation control agent described later.

[Orientation control agent]
The liquid crystal composition of the present invention may contain an orientation control agent, if necessary.
The orientation control agent can form various orientation states such as homeotropic orientation (vertical orientation), tilt orientation, hybrid orientation, and cholesteric orientation, in addition to homogenius orientation, and can make a specific orientation state more uniform and more uniform. It can be realized by precise control.

As the orientation control agent that promotes homogeneous orientation, for example, a small molecule orientation control agent or a polymer orientation control agent can be used.
Examples of the small molecule orientation control agent include paragraphs [0009] to [0083] of JP-A-2002-20363, paragraphs [0111]-[0120] of JP-A-2006-106662, and JP-A-2012. The description in paragraphs [0021] to [0029] of JP-A-21306 can be referred to, and the content thereof is incorporated in the present specification.
Further, as the polymer orientation control agent, for example, paragraphs [0021] to [0057] of JP-A-2004-198511 and paragraphs [0121] to [0167] of JP-A-2006-106662 are referred to. And this content is incorporated herein by reference.

Examples of the orientation control agent for forming or promoting homeotropic orientation include boronic acid compounds and onium salt compounds, and specifically, paragraphs [0023] to [0032] of JP-A-2008-225281. , Paragraphs [0052] to [0058] of JP2012-208397A, paragraphs [0024] to [0055] of JP2008-026730, and [0043] to [0055] of JP2016-193869. The compounds described in paragraphs and the like can be taken into consideration, the contents of which are incorporated herein by reference.

On the other hand, the cholesteric orientation can be realized by adding a chiral agent to the polymerizable composition of the present invention, and the turning direction of the cholesteric orientation can be controlled by the direction of the chiral property. The pitch of the cholesteric orientation can be controlled according to the orientation regulating force of the chiral agent.

When the orientation control agent is contained, the content is preferably 0.01 to 10% by mass, more preferably 0.05 to 5% by mass, based on the total solid content mass in the liquid crystal composition. .. When the content is in this range, it is possible to obtain a uniform and highly transparent optically anisotropic film without precipitation, phase separation, orientation defects, etc., while achieving a desired orientation state.
These orientation control agents can further impart a polymerizable functional group, particularly a polymerizable functional group that can be polymerized with the polymerizable liquid crystal compound constituting the liquid crystal composition of the present invention.

[Other ingredients]
The liquid crystal composition of the present invention may contain a component other than the above-mentioned components, for example, a liquid crystal compound other than the above-mentioned inverse wavelength dispersible liquid crystal compound, a surfactant, a tilt angle control agent, an orientation aid, and a plasticizer. Agents, cross-linking agents and the like can be mentioned.

[Optically anisotropic film]
The optically anisotropic film of the present invention is an optically anisotropic film obtained by polymerizing the above-mentioned liquid crystal composition of the present invention.
Examples of the method for forming the optically anisotropic film include a method of using the liquid crystal composition of the present invention described above to obtain a desired orientation state and then immobilizing the film by polymerization.
Here, the polymerization conditions are not particularly limited, but it is preferable to use ultraviolet rays in the polymerization by light irradiation. Irradiation amount ^is preferably ^{10mJ / cm 2 ~50J / cm 2} , more preferably ^{20mJ / cm 2 ~5J / cm 2} , more preferably 30mJ ^/ cm ² ~3J ^/ cm 2 , 50 to 1000 mJ / cm ² is particularly preferable. Further, in order to promote the polymerization reaction, it may be carried out under heating conditions.
In the present invention, the optically anisotropic film can be formed on an arbitrary support in the optical film of the present invention described later or on a polarizing element in the polarizing plate of the present invention described later.

The optically anisotropic membrane of the present invention preferably satisfies the following formula (III).
0.50 <Re (450) / Re (550) <1.00 ... (III)
Here, in the above formula (III), Re (450) represents an in-plane lettering of the optically anisotropic film at a wavelength of 450 nm, and Re (550) represents an in-plane letter of the optically anisotropic film at a wavelength of 550 nm. Represents the optics. If the measurement wavelength of the retardation is not specified in the present specification, the measurement wavelength is 550 nm.
Further, the values of the in-plane retardation and the retardation in the thickness direction refer to the values measured by using AxoScan OPMF-1 (manufactured by Optoscience) and using light of the measurement wavelength.
Specifically, by inputting the average refractive index ((Nx + Ny + Nz) / 3) and the film thickness (d (μm)) in AxoScan OPMF-1.
Slow phase axial direction (°)
Re (λ) = R0 (λ)
Rth (λ) = ((nx + ny) /2-nz) × d
Is calculated.
Although R0 (λ) is displayed as a numerical value calculated by AxoScan OPMF-1, it means Re (λ).

The optically anisotropic membrane of the present invention is preferably a positive A plate or a positive C plate, and more preferably a positive A plate.

Here, the positive A plate (positive A plate) and the positive C plate (positive C plate) are defined as follows.
The refractive index in the slow axis direction in the film plane (the direction in which the refractive index in the plane is maximized) is nx, the refractive index in the direction orthogonal to the slow phase axis in the plane in the plane is ny, and the refraction in the thickness direction. When the rate is nz, the positive A plate satisfies the relation of the formula (A1), and the positive C plate satisfies the relation of the formula (C1). The positive A plate shows a positive value for Rth, and the positive C plate shows a negative value for Rth.
Equation (A1) nx> ny≈nz
Equation (C1) nz> nx≈ny
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 in 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 when (nx-nz) xd is -10 to 10 nm, preferably -5 to 5 nm, it is also included in "nx≈nz". Further, in the positive C plate, for example, when (nx-ny) × d (where d is the thickness of the film) is 0 to 10 nm, preferably 0 to 5 nm, it is also included in “nx≈ny”.

When the optically anisotropic film of the present invention is a positive A plate, Re (550) is preferably 100 to 180 nm, more preferably 120 to 160 nm, from the viewpoint of functioning as a λ / 4 plate. It is more preferably 130 to 150 nm, and particularly preferably 130 to 140 nm.
Here, the "λ / 4 plate" is a plate having a λ / 4 function, and specifically, a function of converting linearly polarized light having a specific wavelength into circularly polarized light (or converting circularly polarized light into linearly polarized light). It is a plate having.

[Optical film]
The optical film of the present invention is an optical film having the optically anisotropic film of the present invention.
1A, 1B and 1C (hereinafter, these drawings are abbreviated as "FIG. 1" when no particular distinction is required) are schematic cross-sectional views showing an example of the optical film of the present invention, respectively.
Note that FIG. 1 is a schematic diagram, and the thickness relationship and positional relationship of each layer do not always match the actual ones, and the support, alignment film, and hardcoat layer shown in FIG. 1 all have an arbitrary configuration. It is a member.
The optical film 10 shown in FIG. 1 has a support 16, an alignment film 14, and an optically anisotropic film 12 in this order.
Further, as shown in FIG. 1B, the optical film 10 may have the hard coat layer 18 on the side opposite to the side where the alignment film 14 of the support 16 is provided, and as shown in FIG. 1C, the optical film 10 may have a hard coat layer 18. The hard coat layer 18 may be provided on the side of the optically anisotropic film 12 opposite to the side on which the alignment film 14 is provided.
Hereinafter, various members used in the optical film of the present invention will be described in detail.

[Optically anisotropic film]
The optically anisotropic film of the optical film of the present invention is the above-mentioned optically anisotropic film of the present invention.
In the optical film of the present invention, the thickness of the optically anisotropic film is not particularly limited, but is preferably 0.1 to 10 μm, more preferably 0.5 to 5 μm.

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

Examples of such a support include a glass substrate and a polymer film, and examples of the polymer film material include a cellulose-based polymer; an acrylic-based polymer having an acrylic acid ester polymer such as polymethylmethacrylate and a lactone ring-containing polymer. Polymers; thermoplastic norbornene polymers; polycarbonate polymers; polyester polymers such as polyethylene terephthalate and polyethylene naphthalate; styrene polymers such as polystyrene and acrylonitrile / styrene copolymers (AS resin); polyethylene, polypropylene, ethylene / propylene Polyolefin-based polymers such as polymers; Vinyl chloride-based polymers; Amido-based polymers such as nylon and aromatic polyamides; Imid-based polymers; Examples thereof include vinylidene chloride-based polymers; vinyl alcohol-based polymers; vinyl butyral-based polymers; allylate-based polymers; polyoxymethylene-based polymers; epoxy-based polymers; or polymers in which these polymers are mixed.
Further, the polarizing element 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.

[Alignment film]
When the optical film of the present invention has any of the above-mentioned supports, it is preferable that the optical film has an alignment film between the support and the optically anisotropic film. The support described above may also serve as an alignment film.

The alignment film is generally composed of a polymer as a main component. The polymer material for an alignment film has been described in a large number of documents, and a large number of commercially available products are available.
The polymer material used in the present invention is preferably polyvinyl alcohol or polyimide, and its derivatives. Particularly modified or unmodified polyvinyl alcohol is preferable.
For the alignment film that can be used in the present invention, for example, the alignment film described in International Publication No. 01/88574, page 43, lines 24 to 49, line 8; paragraphs [0071] to [00905] of Japanese Patent No. 3907735. ]. The modified polyvinyl alcohol described in [Japanese Patent Laid-Open No. 2012-155308; the liquid crystal alignment film formed by the liquid crystal alignment agent described in JP-A-2012-155308;

In the present invention, it is also preferable to use a photoalignment film as the alignment film because it is possible to prevent surface deterioration by not contacting the surface of the alignment film when the alignment film is formed.
The photoalignment film is not particularly limited, but is a polymer material such as a polyamide compound or a polyimide compound described in paragraphs [0024] to [0043] of International Publication No. 2005/096041; A liquid crystal alignment film formed by a liquid crystal alignment agent having a photo-oriented group; a trade name LPP-JP265CP manufactured by Polyimide Technologies, etc. can be used.

Further, in the present invention, the thickness of the alignment film is not particularly limited, but from the viewpoint of alleviating the surface irregularities that may exist on the support and forming an optically anisotropic film having a uniform film thickness, 0. It is preferably 01 to 10 μm, more preferably 0.01 to 1 μm, and even more preferably 0.01 to 0.5 μm.

[Hard coat layer]
The optical film of the present invention preferably has a hardcoat layer in order to impart physical strength to the film. Specifically, the hardcourt layer may be provided on the side opposite to the side where the alignment film of the support is provided (see FIG. 1B), and the side where the alignment film of the optically anisotropic film is provided. May have a hardcourt layer on the opposite side (see FIG. 1C).
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 present invention may have another optically anisotropic film in addition to the optically anisotropic film of the present invention.
That is, the optical film of the present invention may have a laminated structure of the optically anisotropic film of the present invention and another optically anisotropic film.
Examples of such other optically anisotropic films include optically anisotropic films obtained by using the above-mentioned polymerizable liquid crystal compound without blending the above-mentioned compound (I).

[UV absorber]
The optical film of the present invention preferably contains an ultraviolet (UV) absorber in consideration of the influence of external light (particularly ultraviolet light).
The ultraviolet absorber may be contained in the optically anisotropic film of the present invention, or may be contained in a member other than the optically anisotropic film constituting the optical film of the present invention. As the member other than the optically anisotropic film, for example, a support is preferably mentioned.
As the ultraviolet absorber, any conventionally known agent capable of exhibiting ultraviolet absorption can be used. Among such ultraviolet absorbers, a benzotriazole-based or hydroxyphenyltriazine-based ultraviolet absorber may be used from the viewpoint of obtaining the ultraviolet absorbing ability (ultraviolet blocking ability) used in an image display device because of its high ultraviolet absorbing ability. preferable.
Further, in order to widen the absorption range of ultraviolet rays, two or more kinds of ultraviolet absorbers having different maximum absorption wavelengths can be used in combination.
Specific examples of the ultraviolet absorber include the compounds described in paragraphs [0258] to [0259] of JP2012-18395, paragraphs [0055] to [0105] of JP2007-72163. Examples thereof include the compounds described in.
Further, as commercially available products, Tinuvin 400, Tinuvin 405, Tinuvin 460, Tinuvin 477, Tinuvin 479, Tinuvin 1577 (all manufactured by BASF) and the like can be used.

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

[Polarizer]
The polarizing plate of 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 absorption-type and reflective-type polarizing elements can be used. ..
As the absorption type polarizing element, an iodine-based polarizing element, a dye-based polarizing element using a dichroic dye, a polyene-based polarizing element, and the like are used. Iodine-based and dye-based polarizing elements include coated and stretched polarizing elements, both of which can be applied, but polarized light produced by adsorbing iodine or a dichroic dye on polyvinyl alcohol and stretching it. Children are preferred.
Further, as a method for obtaining a polarizing element by stretching and dyeing a laminated film having a polyvinyl alcohol layer formed on a substrate, Japanese Patent No. 5048120, Japanese Patent No. 5143918, Japanese Patent No. 4691020, and Japanese Patent No. Japanese Patent No. 4751481 and Japanese Patent No. 4751486 can be mentioned, and known techniques relating to these substituents can also be preferably used.
As the reflective polarizing element, a polarizing element in which thin films having different birefringences are laminated, a wire grid type polarizing element, a carboxylator in which a cholesteric liquid crystal having a selective reflection region and a 1/4 wave plate are combined, and the like are used.
Among them, in terms of adhesion more excellent, polyvinyl alcohol-based resin (polymer containing as a repeating unit -CH ₂ -CHOH- particular, polyvinyl alcohol and ethylene -. At least one selected from the group consisting of vinyl alcohol copolymer It is preferable that the polymer contains one).

In the present invention, the thickness of the polarizing element is not particularly limited, but is preferably 3 μm to 60 μm, more preferably 5 μm to 30 μm, and even more preferably 5 μm to 15 μm.

[Adhesive layer]
In the polarizing plate of the present invention, an adhesive layer may be arranged between the optically anisotropic film in the optical film of the present invention and the polarizing element.
The pressure-sensitive adhesive layer used for laminating the optically anisotropic film and the stator is, for example, the ratio of the storage elastic modulus G'and the loss elastic modulus G'measured by a dynamic viscoelasticity measuring device (tan δ =). G "/ G') represents a substance having a value of 0.001 to 1.5, and includes so-called adhesives, substances that easily creep, and the like. Examples of the pressure-sensitive adhesive that can be used in the present invention include, but are not limited to, polyvinyl alcohol-based pressure-sensitive 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 a liquid crystal cell, an organic electroluminescence (hereinafter abbreviated as “EL”) display panel, and a plasma display panel.
Of these, a liquid crystal cell and an organic EL display panel are preferable, and a liquid crystal cell is 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 and an organic EL display device using an organic EL display panel as a display element, and the liquid crystal display device is preferable. More preferred.

[Liquid crystal display device]
The 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-mentioned polarizing plate of the present invention and a liquid crystal cell.
In the present invention, among the polarizing plates provided on both sides of the liquid crystal cell, it is preferable to use the polarizing plate of the present invention as the polarizing plate on the front side, and the polarizing plate of the present invention as the polarizing plate on the front side and the rear side. Is more preferable to use.
The liquid crystal cells constituting the liquid crystal display device will be described in detail below.

<LCD cell>
The liquid crystal cell used in the liquid crystal display device is preferably a VA (Vertical Element) mode, an OCB (Optically Compensated Bend) mode, an IPS (In-Plane-Switching) mode, or a TN (Twisted Nematic) mode. Not limited to.
In the liquid crystal cell in the TN mode, the rod-shaped liquid crystal molecules are substantially horizontally oriented when no voltage is applied, and are further twisted to 60 to 120 °. The TN mode liquid crystal cell is most often used as a color TFT liquid crystal display device, and has been described in many documents.
In the VA mode liquid crystal cell, the rod-shaped liquid crystal molecules are substantially vertically oriented when no voltage is applied. In the VA mode liquid crystal cell, (1) a VA mode liquid crystal cell in a narrow sense (1) in which rod-shaped liquid crystal molecules are oriented substantially vertically when no voltage is applied and substantially horizontally when a voltage is applied (Japanese Patent Laid-Open No. 2-). In addition to (described in Japanese Patent Publication No. 176625), (2) a liquid crystal cell (SID97, Digital of technique. Papers (Proceedings) 28 (1997) 845 in which the VA mode is multi-domainized for expanding the viewing angle). ), (3) Liquid crystal cells in a mode (n-ASM mode) in which rod-shaped liquid crystal molecules are substantially vertically oriented when no voltage is applied and twisted and multi-domain oriented when a voltage is applied. (1998)) and (4) SURVIVAL mode liquid crystal cells (announced at LCD International 98) are included. Further, it may be any of PVA (Patternized Vertical Alignment) type, optical alignment type (Optical Alignment), and PSA (Polymer-Stained Alignment). Details of these modes are described in Japanese Patent Application Laid-Open No. 2006-215326 and Japanese Patent Application Laid-Open No. 2008-538819.
In the IPS mode liquid crystal cell, the rod-shaped liquid crystal molecules are oriented substantially parallel to the substrate, and the liquid crystal molecules respond in a plane by applying an electric field parallel to the substrate surface. In the IPS mode, the display is black when no electric field is applied, and the absorption axes of the pair of upper and lower polarizing plates are orthogonal to each other. Methods for using an optical compensation sheet to reduce leakage light when displaying black in an oblique direction and improving the viewing angle are described in JP-A-10-54982, JP-A-11-202323, and JP-A-9-292522. It is disclosed in JP-A-11-133408, JP-A-11-305217, JP-A-10-307291, and the like.

[Organic EL display device]
The organic EL display device, which is an example of the image display device of the present invention, includes, for example, a polarizing element, a λ / 4 plate (positive A plate) made of the optically anisotropic film of the present invention, and an organic EL from the viewing side. A mode having a display panel in this order is preferably mentioned.
Further, the organic EL display panel is a display panel configured by using an organic EL element formed by sandwiching an organic light emitting layer (organic electroluminescence layer) between electrodes (between a cathode and an anode). The configuration of the organic EL display panel is not particularly limited, and a known configuration is adopted.

Hereinafter, the present invention will be described in more detail based on examples. The materials, amounts used, ratios, treatment contents, treatment procedures, etc. shown in the following examples can be appropriately changed as long as they do not deviate from the gist of the present invention. Therefore, the scope of the present invention should not be construed as limiting by the examples shown below.

[Example 1]
<Preparation of alignment film P-1>
The following coating liquid for forming the alignment film P-1 was continuously applied onto a commercially available triacetyl cellulose film "Z-TAC" (manufactured by FUJIFILM Corporation) using a wire bar of # 2.4. ..
Next, the support on which the coating film was formed was dried with warm air at 140 ° C. for 120 seconds, and then irradiated with polarized ultraviolet rays (10 mJ / cm ² , using an ultrahigh pressure mercury lamp) to form an alignment film P-1. bottom.
────────────────────────────────
(Coating liquid for alignment film P-1)
────────────────────────────────
・ The following polymer PA-1 100.00 parts by mass ・ Isopropyl alcohol 16.50 parts by mass ・ Butyl acetate 1072.00 parts by mass ・ Methyl ethyl ketone 268.00 parts by mass ────────────── ──────────────────

Polymer PA-1

<Formation of positive A plate A-1>
The following composition A-1 was applied onto the alignment film P-1 using a bar coater.
Next, the coating film formed on the alignment film P-1 was heated to 180 ° C. with warm air, then cooled to 120 ° C., and 100 mJ / cm ² at a wavelength of 365 nm using a high-pressure mercury lamp under a nitrogen atmosphere. By irradiating the coating film with ultraviolet rays, the orientation of the liquid crystal compound was fixed, and a positive A plate A-1 was prepared.
The Re (nm), Re (450) / Re (550), and thickness (d) of the prepared positive A plate A-1 are shown in Table 3 below.
Further, the wavelength dispersibility (Δn (450) / Δn (550)) of the reverse wavelength dispersible liquid crystal compound and the forward wavelength dispersible compound in the following composition A-1 is shown in Table 3 below.

―――――――――――――――――――――――――――――――――
(Composition A-1)
―――――――――――――――――――――――――――――――――
-The following reverse wavelength dispersible liquid crystal compound L-2 70.00 parts by mass-The following forward wavelength dispersible compound 1-4 30.00 parts by mass-The following polymerization initiator PI-1 0.50 parts by mass-The following leveling agent T- 10.20 parts by mass and 570.000 parts by mass of chloroform ――――――――――――――――――――――――――――――――――

Reverse wavelength dispersible liquid crystal compound L-2

Forward wavelength dispersible compound 1-4

Polymerization Initiator PI-1

Leveling agent T-1

[Example 2]
A positive A plate A-2 was prepared by the same method as in Example 1 except that the composition A-1 was changed to the following composition A-2 and the thickness was adjusted.
The Re (nm), Re (450) / Re (550), and thickness (d) of the positive A plate A-2 are shown in Table 3 below. Further, the wavelength dispersibility (Δn (450) / Δn (550)) of the reverse wavelength dispersible liquid crystal compound and the forward wavelength dispersible compound in the following composition A-2 is shown in Table 3 below.

―――――――――――――――――――――――――――――――――
(Composition A-2)
―――――――――――――――――――――――――――――――――
-The following reverse wavelength dispersible liquid crystal compound L-3 70.00 parts by mass-The following forward wavelength dispersible compound 1-6 30.00 parts by mass-The polymerization initiator PI-1 0.50 parts by mass-The leveling agent T- 10.20 parts by mass and 570.000 parts by mass of chloroform ――――――――――――――――――――――――――――――――――

Reverse wavelength dispersible liquid crystal compound L-3

Forward wavelength dispersible compound 1-6

[Example 3]
A positive A plate A-3 was prepared by the same method as in Example 1 except that the composition A-1 was changed to the following composition A-3 and the thickness was adjusted.
The Re (nm), Re (450) / Re (550), and thickness (d) of the positive A plate A-3 are shown in Table 3 below. Further, the wavelength dispersibility (Δn (450) / Δn (550)) of the reverse wavelength dispersible liquid crystal compound and the forward wavelength dispersible compound in the following composition A-3 is shown in Table 3 below.

―――――――――――――――――――――――――――――――――
(Composition A-3)
―――――――――――――――――――――――――――――――――
-The following reverse wavelength dispersible liquid crystal compound L-4 70.00 parts by mass-The following forward wavelength dispersible compound 1-7 30.00 parts by mass-The polymerization initiator PI-1 0.50 parts by mass-The leveling agent T- 10.20 parts by mass and 570.000 parts by mass of chloroform ――――――――――――――――――――――――――――――――――

Reverse wavelength dispersible liquid crystal compound L-4

Forward wavelength dispersible compound 1-7

[Example 4]
A positive A plate A-4 was prepared by the same method as in Example 1 except that the composition A-1 was changed to the following composition A-4 and the thickness was adjusted.
The Re (nm), Re (450) / Re (550), and thickness (d) of the positive A plate A-4 are shown in Table 3 below. Further, the wavelength dispersibility (Δn (450) / Δn (550)) of the reverse wavelength dispersible liquid crystal compound and the forward wavelength dispersible compound in the following composition A-4 is shown in Table 3 below.

―――――――――――――――――――――――――――――――――
(Composition A-4)
―――――――――――――――――――――――――――――――――
-The following reverse wavelength dispersible liquid crystal compound L-5 70.00 parts by mass-The above forward wavelength dispersible compound 1-7 30.00 parts by mass-The polymerization initiator PI-1 0.50 parts by mass-The leveling agent T- 10.20 parts by mass and 570.000 parts by mass of chloroform ――――――――――――――――――――――――――――――――――

Reverse wavelength dispersible liquid crystal compound L-5

[Example 5]
A positive A plate A-5 was prepared by the same method as in Example 1 except that the composition A-1 was changed to the following composition A-5 and the thickness was adjusted.
The Re (nm), Re (450) / Re (550), and thickness (d) of the positive A plate A-5 are shown in Table 3 below. Further, the wavelength dispersibility (Δn (450) / Δn (550)) of the reverse wavelength dispersible liquid crystal compound and the forward wavelength dispersible compound in the following composition A-5 is shown in Table 3 below.

―――――――――――――――――――――――――――――――――
(Composition A-5)
―――――――――――――――――――――――――――――――――
-The following reverse wavelength dispersible liquid crystal compound 3-7 70.00 parts by mass-The above forward wavelength dispersible compound 1-4 30.00 parts by mass-The polymerization initiator PI-1 0.50 parts by mass-The leveling agent T- 10.20 parts by mass and 570.000 parts by mass of chloroform ――――――――――――――――――――――――――――――――――

Reverse wavelength dispersible liquid crystal compound 3-7

[Example 6]
A positive A plate A-6 was prepared by the same method as in Example 1 except that the composition A-1 was changed to the following composition A-6 and the thickness was adjusted.
The Re (nm), Re (450) / Re (550), and thickness (d) of the positive A plate A-6 are shown in Table 3 below. Further, the wavelength dispersibility (Δn (450) / Δn (550)) of the reverse wavelength dispersible liquid crystal compound and the forward wavelength dispersible compound in the following composition A-6 is shown in Table 3 below.

―――――――――――――――――――――――――――――――――
(Composition A-6)
―――――――――――――――――――――――――――――――――
-The reverse wavelength dispersible liquid crystal compound L-3 70.00 parts by mass-The following forward wavelength dispersible compound 4-2 30.00 parts by mass-The polymerization initiator PI-1 0.50 parts by mass-The leveling agent T- 10.20 parts by mass and 570.000 parts by mass of chloroform ――――――――――――――――――――――――――――――――――

Forward wavelength dispersible compound 4-2

[Comparative Example 1]
A positive A plate A-7 was prepared by the same method as in Example 1 except that the forward wavelength dispersible compound 1-4 was removed from the composition A-1 and the thickness and the heating temperature were adjusted.
The Re (nm), Re (450) / Re (550), and thickness (d) of the positive A plate A-7 are shown in Table 3 below.

[Comparative Example 2]
A positive A plate A-8 was prepared by the same method as in Example 1 except that the forward wavelength dispersible compound 1-6 was removed from the composition A-2 and the thickness and the heating temperature were adjusted.
The Re (nm), Re (450) / Re (550), and thickness (d) of the positive A plate A-8 are shown in Table 3 below.

[Comparative Example 3]
Positive A plate A-9 was prepared by the same method as in Example 1 except that the forward wavelength dispersible compound 1-7 was removed from the composition A-3 and the thickness and the heating temperature were adjusted.
The Re (nm), Re (450) / Re (550), and thickness (d) of the positive A plate A-9 are shown in Table 3 below.

[Comparative Example 4]
A positive A plate A-10 was prepared by the same method as in Example 1 except that the forward wavelength dispersible compound 1-7 was removed from the composition A-4 and the thickness and the heating temperature were adjusted.
The Re (nm), Re (450) / Re (550), and thickness (d) of the positive A plate A-10 are shown in Table 3 below.

[Comparative Example 5]
A positive A plate A-11 was prepared by the same method as in Example 1 except that the forward wavelength dispersible compound 1-4 was removed from the composition A-5 and the thickness and the heating temperature were adjusted.
The Re (nm), Re (450) / Re (550), and thickness (d) of the positive A plate A-11 are shown in Table 3 below.

[evaluation]
The evaluation results of moist heat durability of the positive A plates prepared in Examples 1 to 6 and Comparative Examples 1 to 5 are summarized in Table 3 below.

<Moist heat durability>
A pressure-sensitive adhesive was attached onto the prepared positive A plate, and Re (550) after holding in an environment of 85 ° C. and 85% for 500 hours was evaluated according to the following criteria.
A: When the ratio of Re (550) after holding is 98% or more with respect to Re (550) before holding at 85 ° C. 85% B: Re (550) before holding at 85 ° C. 85% When the ratio of Re (550) after holding is 95% or more and less than 98% C: The ratio of Re (550) after holding is 90% or more and 95% of Re (550) before holding at 85 ° C. 85%. When it is less than% D: When the ratio of Re (550) after holding is less than 90% with respect to Re (550) before holding at 85 ° C. and 85%.

As shown in Table 3 above, by using a liquid crystal composition containing the forward wavelength dispersible compound (I) together with the reverse wavelength dispersible liquid crystal compound, the wet and heat durability of the formed optically anisotropic film is improved. It was found (Examples 1 to 6). Specifically, from the results of comparison between Examples 1 to 5 and Comparative Examples 1 to 5 (for example, comparison between Example 1 and Comparative Example 1), the reverse wavelength dispersible liquid crystal compound and the forward wavelength dispersible compound (for example) When the composition containing I) is used, the same inverse wavelength dispersible liquid crystal compound is blended, and the wet heat durability of the optically anisotropic film to be formed is compared with the composition not blending the forward wavelength dispersible compound (I). Was found to improve.

10 Optical film 12 Optical anisotropic film 14 Alignment film 16 Support 18 Hardcourt layer

Claims (7)

It contains a liquid crystal compound having a reverse wavelength dispersibility and a compound having a forward wavelength dispersibility and represented by the following formula (I) .
The liquid crystal compound is Ru compound der represented by the following formula (II), the liquid crystal composition.
R ^1- C (= O) -Cy ^1- Cy ^2- C (= O) -R ² ... (I)
L ^1- SP ^1- (D ^5- A ^1- D ^3- G ^1- D ^1- Ar-D ² ) _m- G ^2- D ^4- A ^2- D ^6- SP ^2- L ² ... ( II)
Here, in the above formula (I), Cy ¹ and Cy ² represent a 1,4-cyclohexylene group which may have a substituent, and R ¹ and R ² are independent hydrogen atoms, respectively. Alternatively, it represents a substituent.
Further, in the above formula (II),
m represents an integer of 1 to 10. When m is an integer of 2 to 10, each symbol that will be present in a plurality of symbols in the equation may be the same or different.
D ¹ , D ² , D ³ , D ⁴ , D ⁵ and D ⁶ are independently single-bonded or -CO-, -O-, -S-, -C (= S)-, -CR. ^{1 R 2 -, - CR 3} = CR 4 -, - NR 5 -, or a divalent linking group formed from these two or more ^thereof, R 1 to R ⁵ are each independently a hydrogen atom , A hydrogen 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 constitutes the alicyclic hydrocarbon group-CH. _{One or more of 2} − may be substituted with −O−, −S− or −NH−.
A ¹ and A ² each independently represent a cycloalkane ring having 6 or more carbon atoms which may have a substituent.
SP ¹ and SP ² 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-, where 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 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 a polymerizable group.} Represents.
Ar represents any aromatic ring selected from the group consisting of the groups represented by the following formulas (Ar-1) to (Ar-5).

Here, in the above equations (Ar-1) to (Ar-5),
* Represents the bonding position with ^{D 1} or D ^2.
Q ¹ represents N or CH.
Q ² is, -S -, - O-, or, -N ^{(R 6)} - represents, ^{R 6} represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.
Y ¹ represents an aromatic hydrocarbon group having 6 to 12 carbon atoms or an aromatic heterocyclic group having 3 to 12 carbon atoms, which may have a substituent.
Z ¹ , Z ² and Z ³ independently have a hydrogen atom, a monovalent aliphatic hydrocarbon group having 1 to 20 carbon atoms, a monovalent alicyclic hydrocarbon group having 3 to 20 carbon atoms, and a carbon number of carbon atoms. Represents 6 to 20 monovalent aromatic hydrocarbon groups, halogen atoms, cyano groups, nitro groups, -OR ⁷ , -NR ⁸ R ⁹ , or -SR ¹⁰ , where R ^{7 to} R ¹⁰ are independent of each other. , A hydrogen atom or an alkyl group having 1 to 6 carbon atoms, and Z ¹ and Z ² may be bonded to 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 ¹¹ )-, -S-, and -CO-, where R ¹¹ is a hydrogen atom or Represents a substituent.
X represents a group 14-16 non-metal atom to which a hydrogen atom or a substituent may be bonded.
D ⁷ and ^{D 8} are each independently a single bond, or, -CO -, - O -, - S -, - C (= S) -, - CR 1 R 2 -, - CR 3 = CR 4 - , -NR ^5- , or a divalent linking group consisting of two or more of these, and R ^{1 to} R ⁵ each independently have a hydrogen atom, a fluorine atom, or 1 to 4 carbon atoms. Represents an alkyl group.
SP ³ and SP ⁴ 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-, where 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} the above formula (II) 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 an aromatic hydrocarbon ring and an aromatic heterocycle.
Ay has a hydrogen atom, an alkyl group having 1 to 12 carbon atoms which may have a substituent, or at least one aromatic ring selected from the group consisting of an aromatic hydrocarbon ring and an aromatic heterocycle. , Represents an organic group having 2 to 30 carbon atoms.
The aromatic ring in Ax and Ay may have a substituent, or Ax and Ay may be bonded to form a ring.
Q ³ are a hydrogen atom or may have a substituent alkyl group having 1 to 6 carbon atoms. The liquid crystal composition according to claim 1, wherein the compound represented by the formula (I) is a compound represented by any of the following formulas (I-1) to (I-3).
L ^11- SP ^11- D ^11- C (= O) -Cy ^1- Cy ^2- C (= O) -D ^12- SP ^12- L ¹² ... (I-1)
^{L 11 -SP 11 - (D 13} -A 11) p -D 11 -C (= O) -Cy 1 -Cy 2 -C (= O) -D 12 - (A 12 -D 14) q -SP 12 -L ¹² ... (I-2)
L ¹¹ -SP ¹¹ -D ¹¹ - ^{[C (= O) -Cy 1 -Cy} 2 -C (= O) -D 15 - (A 13 -D 16) r ] _n -C (= O) -Cy ¹ -Cy ^2- C (= O) -D ^12- SP ^12- L ¹² ... (I-3)
Here, in the formulas (I-1) to (I-3),
p represents an integer of 1 to 3, q represents an integer of 1 to 3, r represents an integer of 1 to 3, and n represents an integer of 1 to 10. When p is 2 or 3, q is 2 or 3, r is 2 or 3, or n is an integer of 2 to 10, there will be a plurality of them in the equation. Each symbol may be the same or different.
Cy ¹ and Cy ² represent a 1,4-cyclohexylene group which may have a substituent.
D ¹¹ , D ¹² , D ¹³ , D ¹⁴ , D ¹⁵ and D ¹⁶ are independently single-bonded or -CO-, -O-, -S-, -C (= S)-, -CR. ^{1 R 2 -, - CR 3} = CR 4 -, - NR 5 -, or a divalent linking group formed from these two or more ^thereof, R 1 to R ⁵ are each independently a hydrogen atom , A hydrogen atom, or an alkyl group having 1 to 4 carbon atoms.
SP ¹¹ and SP ¹² 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-, where Q is a substituent. Represents.
L ¹¹ and L ¹² each independently represent a hydrogen atom or a polymerizable group.
A ¹¹ , A ¹² and A ¹³ are independently aromatic rings having 6 or more carbon atoms which may have a substituent, or divalents having 5 to 8 carbon atoms which may have a substituent. Represents the alicyclic hydrocarbon group of, _{and one or more of −CH 2} − constituting the alicyclic hydrocarbon group may be substituted with —O—, —S— or −NH−. An optically anisotropic film obtained by polymerizing the liquid crystal composition according to claim 1 or 2. The optically anisotropic film according to claim 3 , which satisfies the following formula (III).
0.50 <Re (450) / Re (550) <1.00 ... (III)
Here, in the formula (III), 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 a letteration. An optical film having the optically anisotropic film according to claim 3 or 4. A polarizing plate having the optical film according to claim 5 and a polarizing element. An image display device having the optical film according to claim 5 or the polarizing plate according to claim 6.

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