JP2005189285A - Optical compensation sheet, liquid crystal display device, and manufacturing method of optical compensation sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a new optical compensation sheet, a liquid crystal display device using the same, and a manufacturing method of the optical compensation sheet. <P>SOLUTION: The optical compensation sheet comprises at least a supporting body and an optical anisotropic layer prepared on the supporting body, and is characterized in that the optical anisotropic layer consists of at least two different kinds of compounds selected from the compounds expressed by the following general formula (I), and liquid crystalline compounds. The general formula (I) is (Rf-X-)<SB>m</SB>Ar(-W)<SB>n</SB>, and in the formula (I); Ar represents an aromatic heterocycle or an aromatic hydrocarbon ring; X represents a single bond or bivalent linking group; Rf is an alkyl group partly or totally replaced by fluorine atoms; W represents a sulfo group or a carboxyl group; m expresses 1 to 4; and n expresses 1 or 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a novel optical compensation sheet, a liquid crystal display device using the same, and a method for manufacturing the optical compensation sheet.

  Optical compensation sheets are used in various liquid crystal display devices in order to eliminate image coloring and expand the viewing angle. Conventionally, a stretched birefringent film has been used as an optical compensation sheet.In recent years, instead of a stretched birefringent film, an optical compensation sheet having an optically anisotropic layer made of a discotic liquid crystalline compound on a support is used. It is proposed to use. In this optically anisotropic layer, a composition containing a discotic liquid crystalline compound is usually applied on an alignment film, and heated to a temperature higher than the alignment temperature to align the discotic liquid crystalline compound, and the alignment state is changed. It is formed by fixing.

  In general, the discotic liquid crystalline compound has a large birefringence and various alignment forms. By using a discotic liquid crystalline compound, it has become possible to realize optical properties that cannot be obtained with a conventional stretched birefringent film.

  On the other hand, since the discotic liquid crystalline compound has various alignment forms, it is necessary to control the orientation of the discotic liquid crystalline compound in the optically anisotropic layer in order to develop desired optical characteristics. In particular, in order to develop optical compensation performance, it is important to realize a so-called “hybrid alignment” state in which the tilt angle of the discotic liquid crystalline compound is aligned so as to change with the distance from the support surface. It is the most important factor that determines the performance of the optical compensation sheet, that is, the viewing angle expansion, the contrast reduction due to the viewing angle change, the gradation inversion, the black-and-white inversion, and the hue change. This hybrid alignment is the difference between the inclination angle of the alignment film surface provided on the support and the inclination angle of the air-side interface, which is the outermost surface of the optical compensation sheet, for the purpose of regulating the orientation angle of the discotic liquid crystalline compound. It is realized by using. After applying and drying an optical compensation sheet using a discotic liquid crystalline compound, the discotic liquid crystalline compound is monodomain aligned at a stable tilt angle at both the air interface and the alignment film interface. As a result, an alignment state in which the inclination angle continuously changes in the thickness direction of the film is formed. The discotic liquid crystalline compound has a property of having a high tilt angle of 50 degrees or more at the air interface. Therefore, in order to realize hybrid alignment, the tilt angle of the alignment film interface must be significantly smaller than the tilt angle of the air interface. An alignment film using polyvinyl alcohol is suitably used for realizing the target hybrid alignment because the inclination angle is close to 0 degrees (Patent Document 1).

  On the other hand, in order to obtain a desired optical compensation function, it is necessary to precisely control the inclination angle on the air interface side. As a method of obtaining an angle exceeding 50 degrees, which is an inclination angle obtained at a normal air interface, a method of adding a partially esterified cellulose (Patent Document 2) or a fluorine-substituted alkyl group and a hydrophilic group (a sulfo group via a linking group) A method of adding a compound having a benzene ring) (page 7-10 of Patent Document 3) has been proposed. However, when the present inventors actually used these optical compensation sheets, light leakage from the oblique direction of the polarizing plate was observed, and the viewing angle did not expand sufficiently (to the extent that could be expected theoretically). It turns out that there is also. Furthermore, the inventor considered that the tilt angle of the discotic liquid crystalline compound is not sufficiently controlled as one of the reasons that the optical compensation function becomes insufficient.

  Further, in these methods, since the discotic liquid crystalline compound cannot be regulated in the azimuth direction at the air interface, regions having different azimuth directions are generated, and as a result, alignment defects (Schlieren defects) are likely to occur. Form. When alignment defects occur in the optically anisotropic layer, there is a problem that light scattering occurs and optical properties are impaired. If the alignment defect maintains a liquid crystal state by temperature control and gives sufficient alignment aging time, the azimuthal direction of the alignment is changed so that the discotic liquid crystalline compound cancels the defect, and disappears with time. In particular, it becomes monodomain to achieve defect-free hybrid orientation. For this reason, if the ripening time is shortened for the purpose of manufacturing efficiency, there is a problem that the occurrence of orientation defects tends to become remarkable, and it is necessary to develop a technique that can shorten the monodomainization time. In particular, in order to obtain the desired optical performance, when the above compound is added to increase the inclination angle on the air interface side, the defect disappearance rate is remarkably delayed, resulting in extremely inefficient production. Therefore, there has been a strong demand for the development of a technology that can efficiently promote the hybrid alignment of liquid crystal compounds and precisely control the inclination angle of the air interface.

Furthermore, in the prior art, an optical compensation sheet has been developed mainly assuming a small or medium-sized liquid crystal display device of 15 inches or less. However, recently, it is also necessary to assume a liquid crystal display device having a large size of 17 inches or more and high brightness. When a conventional optical compensation sheet was mounted as a protective film on a polarizing plate of a large liquid crystal display device, it was found that unevenness occurred on the panel. This defect is particularly likely to occur when the size is larger and the brightness is higher than that of the small or medium size. Therefore, it is necessary to further develop an optical film that copes with these light leakage unevenness.
As a technique for improving unevenness, a method of incorporating a leveling agent into a polymerizable liquid crystal is disclosed (Patent Document 4). However, as a result of studies by the inventors, it has been found that this method is effective only when the polymerizable liquid crystal is homogeneously aligned, and cannot be applied to complex alignment such as hybrid alignment as in the present invention.

JP-A-8-50206 JP-A-8-95030 JP 2001-330725 A JP-A-11-148080

  The present invention controls a tilt angle of a liquid crystal compound that is hybrid-aligned in an optically anisotropic layer, is excellent in optical compensation function, and has a wide viewing angle widening performance when applied to an image display device. It is an object to provide a compensation sheet and a manufacturing method thereof. In particular, the viewing angle of liquid crystal display devices such as TN mode, OCB mode, IPS mode, VA mode, etc., which controls the tilt angle on the air interface side and contains a hybrid oriented discotic liquid crystalline compound in the optically anisotropic layer It is an object to provide an optical compensation sheet that contributes to the above. It is another object of the present invention to provide an optical film that can display an image with high display quality without causing unevenness even when applied to a large liquid crystal display device.

（式（III）において、Ｒ¹は水素原子又はメチル基を表し、Ｘは酸素原子、イオウ原子又はＮ（Ｒ²）−を表し、Ｒ²は水素原子又は炭素数１〜４のアルキル基を表し、Ｈｆは水素原子又はフッ素原子を表し、ｍは１〜６の整数、ｎは２〜４の整数を表す。）
［５］ 前記フルオロ脂肪族基含有ポリマーが、下記一般式（IV）で表されるモノマーから導かれる繰り返し単位を含む重合体であることを特徴とする［４］に記載の光学補償シート。
一般式（IV）

（式（IV）において、Ｒ³は水素原子又はメチル基を表し、Ｙは２価の連結基を表し、Ｒ⁴は置換基を有しても良いポリ（アルキレンオキシ）基又は置換基を有しても良い炭素数１〜２０の直鎖、炭素数４〜２０の分岐又は炭素数３〜２０の環状のアルキル基を表す。）
［６］ 前記光学異方性層が、１，３，５−トリアジン環基を有する化合物を含むことを特徴とする［１］〜［５］のいずれかに記載の光学補償シート。
［７］ 前記液晶性化合物が、ディスコティック液晶性化合物である［１］〜［６］のいずれかに記載の光学補償シート。
［８］ 前記光学異方性層が、ハイブリット配向した液晶性化合物を含み、かつ、該ハイブリッド配向した液晶性化合物が固定されている［１］〜［７］のいずれかに記載の光学補償シート。
［９］ 前記支持体上に配向膜を有することを特徴とする［１］〜［８］のいずれかに記載の光学補償シート。
［１０］ ［１］〜［９］のいずれかに記載の光学補償シートを有することを特徴とする液晶表示装置。
［１１］ 少なくとも、支持体と、該支持体上に設けられた光学異方性層とからなり、前記光学異方性層は、少なくとも、一般式（Ｉ）
（Ｒｆ−Ｘ−）_mＡｒ（−Ｗ）_n
（式（Ｉ）中、Ａｒは芳香族ヘテロ環又は芳香族炭化水素環を表し、Ｘは単結合又は２価の連結基を表し、Ｒｆは一部又は全部がフッ素原子で置換されたアルキル基を表し、Ｗはスルホ基又はカルボキシル基を表し、ｍは１〜４を表し、ｎは１又は２を表す。）で表される化合物から選ばれる２種の互いに異なる化合物と液晶性化合物とからなる、光学補償シートの製造方法であって、少なくとも、前記液晶性化合物を前記透明支持体上に水平配向させる工程と、該水平配向した液晶性化合物をハイブリッド配向させる工程と、該ハイブリッド配向した前記液晶性化合物を固定する工程とからなることを特徴とする光学補償シートの製造方法。 Means for solving the above problems are as follows.
[1] At least comprises a support and an optically anisotropic layer provided on the support, and the optically anisotropic layer is selected from at least compounds represented by the following general formula (I). An optical compensation sheet comprising two different compounds and a liquid crystal compound.
Formula (I)
(Rf-X-) _m Ar (-W) _n
(In the formula (I), Ar represents an aromatic heterocycle or an aromatic hydrocarbon ring, X represents a single bond or a divalent linking group, and Rf is an alkyl group partially or entirely substituted with a fluorine atom. W represents a sulfo group or a carboxyl group, m represents 1 to 4, and n represents 1 or 2.
[1-2]
In [1], when the content of the compound represented by the general formula (I) is 100% by mass, the content of the two of the two compounds having the highest content is the least, 5% by mass (preferably 10% by mass, more preferably 20% by mass).
[2] One of the two different compounds selected from the compounds represented by the general formula (I) is a compound represented by the following general formula (II) Optical compensation sheet.
Formula (II)
(Rf ¹ -X ^1- ) ₂ Ar ¹ (-W ¹ ) _n1
(In the formula (II), Ar ¹ represents an aromatic heterocycle or an aromatic hydrocarbon ring, X ¹ represents a single bond or a divalent linking group, and Rf ¹ is partially or entirely substituted with a fluorine atom. And W ¹ represents a sulfo group or a carboxyl group, and n1 represents 1 or 2.)
[2-2] Of two different compounds selected from the compounds represented by the general formula (I), one is represented by the general formula (Ia) and the other is represented by the general formula (IIa). [1] The optical compensation sheet according to [1].
[3] The optical compensation sheet according to [1] or [2], wherein the optically anisotropic layer contains a fluoroaliphatic group-containing polymer.
[4] The polymer according to any one of [1] to [3], wherein the fluoroaliphatic group-containing polymer is a polymer including a repeating unit derived from a monomer represented by the following general formula (III). Optical compensation sheet.
General formula (III)

(In the formula (III), R ¹ represents a hydrogen atom or a methyl group, X represents an oxygen atom, a sulfur atom or N (R ² ) —, and R ² represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms. Hf represents a hydrogen atom or a fluorine atom, m represents an integer of 1 to 6, and n represents an integer of 2 to 4.)
[5] The optical compensation sheet according to [4], wherein the fluoroaliphatic group-containing polymer is a polymer containing a repeating unit derived from a monomer represented by the following general formula (IV).
Formula (IV)

(In Formula (IV), R ³ represents a hydrogen atom or a methyl group, Y represents a divalent linking group, and R ⁴ has a poly (alkyleneoxy) group or a substituent which may have a substituent. It may represent a linear alkyl group having 1 to 20 carbon atoms, a branched chain having 4 to 20 carbon atoms, or a cyclic alkyl group having 3 to 20 carbon atoms.)
[6] The optical compensation sheet according to any one of [1] to [5], wherein the optically anisotropic layer contains a compound having a 1,3,5-triazine ring group.
[7] The optical compensation sheet according to any one of [1] to [6], wherein the liquid crystalline compound is a discotic liquid crystalline compound.
[8] The optical compensation sheet according to any one of [1] to [7], wherein the optically anisotropic layer includes a liquid crystal compound with hybrid alignment, and the liquid crystal compound with hybrid alignment is fixed. .
[9] The optical compensation sheet according to any one of [1] to [8], wherein an alignment film is provided on the support.
[10] A liquid crystal display device comprising the optical compensation sheet according to any one of [1] to [9].
[11] It comprises at least a support and an optically anisotropic layer provided on the support, and the optically anisotropic layer has at least the general formula (I)
(Rf-X-) _m Ar (-W) _n
(In the formula (I), Ar represents an aromatic heterocycle or an aromatic hydrocarbon ring, X represents a single bond or a divalent linking group, and Rf is an alkyl group partially or entirely substituted with a fluorine atom. W represents a sulfo group or a carboxyl group, m represents 1 to 4, and n represents 1 or 2.) From two different compounds selected from the compounds represented by: A method for producing an optical compensation sheet, comprising: at least a step of horizontally aligning the liquid crystalline compound on the transparent support; a step of hybrid aligning the horizontally aligned liquid crystalline compound; A method for producing an optical compensation sheet comprising fixing a liquid crystal compound.

  By using the optical compensation film of the present invention, the viewing angle of the liquid crystal display device can be enlarged, and even in a large liquid crystal display device, an image with high display quality can be displayed without causing unevenness. Furthermore, if the liquid crystal compound alignment method of the present invention is used, the production efficiency of the optical compensation film can be remarkably improved.

BEST MODE FOR CARRYING OUT THE INVENTION

  Hereinafter, the contents of the present invention will be described in detail. In the present specification, “to” is used to mean that the numerical values described before and after it are included as a lower limit value and an upper limit value.

  The liquid crystalline compound in the present invention is preferably hybrid aligned. Here, the hybrid alignment means that the major axis direction of the liquid crystal compound (for example, the disk surface of the core in the case of a discotic liquid crystal compound) and the horizontal plane of the liquid crystal layer (for example, the liquid crystal layer is formed on the support). Is an orientation in which the angle (defined as “inclination angle” in the present invention) formed with the surface of the support continuously changes in the thickness direction of the liquid crystal layer. In addition, “horizontal alignment” refers to the long axis direction (for example, discotic liquid crystallinity) of the liquid crystalline compound with respect to the horizontal plane of the liquid crystal layer (for example, the surface of the support when the liquid crystal layer is formed on the support). In the case of a compound, it means that the disk surface of the core is parallel. However, in the present invention, it is not required to be strictly parallel, and it means an orientation in which the inclination angle formed between the major axis direction of the liquid crystal compound and the horizontal plane is less than 10 degrees. In the first alignment step, the tilt angle when the liquid crystal compound is horizontally aligned is preferably 5 degrees or less, more preferably 3 degrees or less, further preferably 2 degrees or less, and most preferably 1 degree or less. The inclination angle may be 0 degree.

  The compound represented by formula (I) used in the optical compensation sheet of the present invention will be described. The compound mainly functions as a tilt angle controlling agent for the liquid crystal compound.

Formula (I)
(Rf-X-) _m Ar (-W) _n
In the formula (I), Ar represents an aromatic heterocycle or an aromatic hydrocarbon ring, X represents a single bond or a divalent linking group, Rf represents an alkyl group substituted with a fluorine atom, and W represents a sulfo group. Represents a group or a carboxyl group, m represents 1 to 4, and n represents 1 or 2.

  More specifically, in the general formula (I), the aromatic heterocyclic group represented by Ar is preferably an aromatic heterocyclic group having 1 to 30 carbon atoms, more preferably 1 to 12 carbon atoms. , A nitrogen atom, an oxygen atom, a heterocyclic group having a hetero atom such as a sulfur atom, a furan ring group, a pyrrole ring group, an imidazole ring group, a pyrazole ring group, an isoxazole ring group, a pyridine ring group, a pyrimidine ring group, 1 , 3,5-triazine ring group, indole ring group, indazole ring group, quinoline ring group, and carbazole ring group are preferable. The aromatic hydrocarbon ring group represented by Ar is preferably an aromatic hydrocarbon ring group having 6 to 30 carbon atoms, more preferably 6 to 20 carbon atoms, and most preferably having 6 carbon atoms.

The aromatic heterocyclic group or aromatic hydrocarbon ring group represented by Ar may have a substituent, and examples of the substituent include the following groups.
An alkyl group (preferably an alkyl group having 1 to 20 carbon atoms, more preferably 1 to 12 carbon atoms, particularly preferably 1 to 8 carbon atoms, such as a methyl group, an ethyl group, an isopropyl group, a tert-butyl group, and n-octyl group, n-decyl group, n-hexadecyl group, cyclopropyl group, cyclopentyl group, cyclohexyl group, etc.) (The carbon number of the alkyl group does not include the carbon atom of the substituent. The same applies to the number of carbon atoms in the above group.), An alkenyl group (preferably an alkenyl group having 2 to 20 carbon atoms, more preferably 2 to 12 carbon atoms, and particularly preferably 2 to 8 carbon atoms. Group, aryl group, 2-butenyl group, 3-pentenyl group, etc.), alkynyl group (preferably having 2 to 20 carbon atoms, more preferably 2 to 1 carbon atoms). In particular, an alkynyl group having 2 to 8 carbon atoms, such as a propargyl group and 3-pentynyl group, and an aryl group (preferably having 6 to 30 carbon atoms, more preferably 6 to 20 carbon atoms). Particularly preferably an aryl group having 6 to 12 carbon atoms, such as a phenyl group, a p-methylphenyl group, and a naphthyl group), a substituted or unsubstituted amino group (preferably having a carbon number of 0 to 20, More preferably, it is an amino group having 0 to 10 carbon atoms, particularly preferably 0 to 6 carbon atoms, and examples thereof include an unsubstituted amino group, a methylamino group, a dimethylamino group, a diethylamino group, and an anilino group).

An alkoxy group (preferably having 1 to 20 carbon atoms, such as a methoxy group, an ethoxy group or a butoxy group), an alkoxycarbonyl group (preferably having 2 to 20 carbon atoms, more preferably having 2 to 16 carbon atoms, Particularly preferably, it is 2 to 10, for example, methoxycarbonyl group, ethoxycarbonyl group and the like, acyloxy group (preferably having 2 to 20 carbon atoms, more preferably 2 to 16 carbon atoms, particularly preferably 2 to 10 carbon atoms). For example, an acetoxy group, a benzoyloxy group, etc.), an acylamino group (preferably an acylamino group having 2 to 20 carbon atoms, more preferably 2 to 16 carbon atoms, and particularly preferably 2 to 10 carbon atoms). Acetylamino group, benzoylamino group, etc.), alkoxycarbonylamino group ( Preferably an alkoxycarbonylamino group having 2 to 20 carbon atoms, more preferably 2 to 16 carbon atoms, particularly preferably 2 to 12 carbon atoms, such as a methoxycarbonylamino group), aryloxycarbonylamino A group (preferably an aryloxycarbonylamino group having 7 to 20 carbon atoms, more preferably 7 to 16 carbon atoms, particularly preferably 7 to 12 carbon atoms, such as a phenyloxycarbonylamino group), a sulfonyl An amino group (preferably a sulfonylamino group having 1 to 20 carbon atoms, more preferably 1 to 16 carbon atoms, and particularly preferably 1 to 12 carbon atoms, and examples thereof include a methanesulfonylamino group and a benzenesulfonylamino group. ), A sulfamoyl group (preferably having 0 to 20 carbon atoms, more preferably A sulfamoyl group having a prime number of 0 to 16, particularly preferably 0 to 12 carbon atoms, and examples thereof include a sulfamoyl group, a methylsulfamoyl group, a dimethylsulfamoyl group, and a phenylsulfamoyl group), a carbamoyl group ( Preferably it is C1-C20, More preferably, it is C1-C16, Most preferably, it is C1-C12 carbamoyl group, for example, unsubstituted carbamoyl group, methylcarbamoyl group, diethylcarbamoyl group, phenylcarbamoyl group Etc.),

An alkylthio group (preferably an alkylthio group having 1 to 20 carbon atoms, more preferably an alkylthio group having 1 to 16 carbon atoms, particularly preferably 1 to 12 carbon atoms, such as a methylthio group and an ethylthio group), an arylthio group ( Preferably it is C6-C20, More preferably, it is C6-C16, Most preferably, it is C6-C12 arylthio group, for example, a phenylthio group etc. are mentioned, A sulfonyl group (preferably C1-C1). 20, more preferably a sulfonyl group having 1 to 16 carbon atoms, particularly preferably a sulfonyl group having 1 to 12 carbon atoms, such as a mesyl group and a tosyl group, and a sulfinyl group (preferably having a carbon number of 1 to 20, more A sulfinyl group having 1 to 16 carbon atoms, particularly preferably 1 to 12 carbon atoms is preferable. Zensulfinyl group and the like), ureido group (preferably a ureido group having 1 to 20 carbon atoms, more preferably 1 to 16 carbon atoms, particularly preferably 1 to 12 carbon atoms, for example, an unsubstituted ureido group , Methylureido group, phenylureido group, etc.), phosphoric acid amide group (preferably having 1 to 20 carbon atoms, more preferably having 1 to 16 carbon atoms, particularly preferably having 1 to 12 carbon atoms). Yes, for example, diethyl phosphoric acid amide group, phenyl phosphoric acid amide group, etc.), hydroxy group, mercapto group, halogen atom (for example, fluorine atom, chlorine atom, bromine atom, iodine atom), cyano group, sulfo group, Carboxyl group, nitro group, hydroxamic acid group, sulfino group, hydrazino group, imino group, heterocyclic group (preferably having a carbon number of 1 to 0, more preferably a heterocyclic group of 1 to 12, for example, a heterocyclic group having a heteroatom such as a nitrogen atom, an oxygen atom, a sulfur atom, such as an imidazolyl group, a pyridyl group, a quinolyl group, a furyl group , Piperidyl group, morpholino group, benzoxazolyl group, benzimidazolyl group, benzthiazolyl group and the like), silyl group (preferably having 3 to 40 carbon atoms, more preferably 3 to 30 carbon atoms, particularly preferably A silyl group having 3 to 24 carbon atoms, and examples thereof include a trimethylsilyl group and a triphenylsilyl group).

  These substituents may be further substituted with these substituents. Further, when two or more substituents are present, they may be the same or different. If possible, they may be bonded to each other to form a ring.

  As the substituent of the aromatic heterocycle or aromatic hydrocarbon ring represented by Ar, among the above, preferably an alkyl group, an aryl group, an alkoxy group, an alkoxycarbonyl group, an acyloxy group, an acylamino group, a sulfonylamino group, An alkylthio group, particularly preferably an alkyl group, an alkoxy group, an alkoxycarbonyl group, and an acyloxy group, and most preferably an unsubstituted aromatic heterocycle or an aromatic hydrocarbon ring.

The divalent linking group represented by X is an alkylene group, an alkenylene group, a divalent aryl group, a divalent heterocyclic group, —CO—, —NR ^a — (R ^a is ^a group having 1 to 5 carbon atoms. An alkyl group or a hydrogen atom), —O—, —S—, —SO—, —SO ₂ —, and combinations thereof, preferably a divalent linking group. The divalent linking group is a group obtained by combining at least two divalent linking groups selected from an alkylene group, —CO—, —NR ^a —, —O—, —S—, —SO ₂ — and a group thereof. It is more preferable that The alkylene group preferably has 1 to 12 carbon atoms. The alkenylene group preferably has 2 to 12 carbon atoms. The number of carbon atoms in the arylene group is preferably 6-10. If possible, the alkylene group, alkenylene group and arylene group are substituted by the groups exemplified as the substituent for the aforementioned Ar ₁ (eg, alkyl group, halogen atom, cyano group, alkoxy group, acyloxy group, etc.). Also good.
X is preferably a divalent linking group, and particularly preferably a divalent linking group selected from the group consisting of an alkylene group, —O—, —S—, and combinations thereof.

The alkyl group substituted with a fluorine atom represented by Rf may have a cyclic structure or a branched structure, preferably has 1 to 20 carbon atoms, more preferably has 4 to 16 carbon atoms, It is especially preferable that it is C4-C12. The substitution rate of fluorine atoms is preferably such that 50% or more of hydrogen atoms contained in the alkyl group are substituted with fluorine atoms, and more preferably 60% or more are substituted. Rf is preferably terminated with a CF ₃ group or a CF ₂ H group, and particularly preferably a CF ₃ group. If possible, the alkyl group substituted with a fluorine atom represented by Rf is, if possible, a group exemplified as the substituent of Ar described above (eg, alkyl group, halogen atom, cyano group, alkoxy group, acyloxy group, etc.). May be substituted.
Specific examples of Rf are shown below.

  W is preferably a sulfo group, m is preferably 1, and n is preferably 1. When m and / or n is 2 or more, each Rf-X- and / or W may be the same or different.

  The general formula (I) is preferably the following general formula (Ia).

一般式（Ｉａ）において、Ｘ²は単結合又は２価の連結基を表し、Ｒｆ²はフッ素原子で置換されたアルキル基を表し、Ｒは水素原子又はアルコキシ基を表す。 Formula (Ia)

In the general formula (Ia), X ² represents a single bond or a divalent linking group, Rf ² represents an alkyl group substituted with a fluorine atom, and R represents a hydrogen atom or an alkoxy group.

In the general formula (Ia), X ² and Rf ² have the same meanings as X and Rf in the general formula (I), and preferred ranges are also the same. The alkoxy group represented by R may have a cyclic structure or a branched structure, preferably has 1 to 20 carbon atoms, more preferably has 4 to 20 carbon atoms, and has 8 to 20 carbon atoms. It is particularly preferred that If possible, the alkoxy group represented by R may be substituted with a group exemplified as the substituent for Ar described above.

  Next, another preferred embodiment of the compound represented by the general formula (I) is a compound represented by the general formula (II). The compound also functions as a tilt angle controlling agent for the liquid crystal compound.

Formula (II)
(Rf ¹ -X ^1- ) ₂ Ar ¹ (-W ¹ ) _n1
In formula (II), Ar ¹ represents an aromatic heterocycle or an aromatic hydrocarbon ring, X ¹ represents a single bond or a divalent linking group, Rf ¹ represents an alkyl group substituted with a fluorine atom, W ¹ represents a sulfo group or a carboxyl group, and n1 represents 1 or 2.

More specifically, in the general formula (II), Ar ¹ , X ¹ , Rf ¹ , W ¹ and n1 have the same meanings as Ar, X, Rf, W and n in the general formula (I), The preferred range is also the same. In formula (II), two Rf ¹ —X ¹ — may be the same or different.

  Particularly preferably, the general formula (II) is the following general formula (IIa).

一般式（IIａ）において、Ｘ³は単結合又は２価の連結基を表し、Ｒｆ³はフッ素原子で置換されたアルキル基を表す。 Formula (IIa)

In the general formula (IIa), X ³ represents a single bond or a divalent linking group, and Rf ³ represents an alkyl group substituted with a fluorine atom.

In the general formula (IIa), X ³ and Rf ³ have the same meanings as X ¹ and Rf ¹ in the general formula (II), and preferred ranges are also the same.

  Specific examples of the compounds represented by the general formulas (I) and (II) are shown below, but the compounds used in the present invention are not limited thereto.

  The compounds represented by the general formulas (I) and (II) can be easily synthesized by combining general alkyl group alkylation reaction, esterification reaction, amidation reaction and the like.

The addition amount of the compound of the present invention is preferably from 0.01 to 20% by mass, particularly preferably from 0.05 to 10% by mass, and most preferably from 0.1 to 5% by mass, based on the amount of the liquid crystal compound.
Furthermore, when the content of the compound represented by the general formula (I) is 100% by mass, the content of the two of the compounds having the highest content is at least 5% by mass. , Preferably 10% by mass, and more preferably 20% by mass.

  More specifically, the compound represented by the general formula (I) is 0.05 to 5% by mass (more preferably 0.1 to 1% by mass) and the general formula (II) with respect to the amount of the liquid crystal compound. It is preferable to make the compound represented by 0.05-5 mass% (more preferably 0.1-1 mass%). Furthermore, the compound represented by the general formula (Ia) is 0.1 to 1% by mass and the compound represented by the general formula (IIa) is 0.1 to 1% by mass with respect to the amount of the liquid crystal compound. Is preferred.

  Next, the fluoroaliphatic group-containing polymer will be described. In the present invention, the fluoroaliphatic group-containing polymer functions as an unevenness preventing agent that more effectively prevents unevenness in the optical film. Therefore, by applying the optical film to a large liquid crystal display device, it is possible to display an image with high display quality without causing unevenness.

Hereinafter, the fluoroaliphatic group-containing polymer according to the present invention will be described in detail.
The fluoroaliphatic group-containing polymer used in the present invention includes a polymer containing the monomer represented by the general formula (III), a polymer containing the monomer represented by the general formulas (III) and (IV), and A polymer obtained by polymerizing a monomer and a polymerizable vinyl monomer is preferable. Specifically, the polymer is preferably an acrylic resin or a methacrylic resin. In addition, the polymer as used in the field of this invention is the meaning including the case where two or more types of monomers are copolymerized besides the case where one type of monomers is polymerized.

  One of the fluoroaliphatic groups in the fluoroaliphatic group-containing polymer according to the present invention is derived from a fluoroaliphatic compound produced by a telomerization method (telomer method) or an oligomerization method (oligomer method). It is. Regarding the production method of these fluoroaliphatic compounds, for example, “Synthesis and Function of Fluorine Compounds” (Supervision: Nobuo Ishikawa, Issue: CMC Co., 1987), “Chemistry of Organic Fluorines Compounds”. II "(Monograph 187, Ed by Milos Hudricky and Attila E. Pavlath, American Chemical Society 1995). The telomerization method is a method of synthesizing a telomer by radical polymerization of a fluorine-containing vinyl compound such as tetrafluoroethylene using an alkyl halide having a large chain transfer constant such as iodide as a telogen (example in Scheme-1). showed that).

  The obtained terminal iodinated telomer is usually subjected to appropriate terminal chemical modification such as (Scheme 2), and led to a fluoroaliphatic compound. These compounds are further converted into a desired monomer structure as necessary, and used for the production of a fluoroaliphatic group-containing polymer.

In the above general formula (III), R ¹ represents a hydrogen atom or a methyl group, X represents an oxygen atom, a sulfur atom, or —N (R ² ) —, and H ^f represents a hydrogen atom or a fluorine atom. Here, R ² represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, specifically a methyl group, an ethyl group, a propyl group, or a butyl group, preferably a hydrogen atom or a methyl group. X is preferably an oxygen atom.
M in the general formula (III) is preferably an integer of 1 to 6, particularly preferably 1 or 2.
N in the general formula (III) is 2 to 4, particularly 2 or 3, and a mixture thereof may be used.
Although the example of the more specific monomer of the fluoro aliphatic group containing monomer represented by general formula (III) is given to the following, it is not this limitation.

In the general formula (IV), R ³ represents a hydrogen atom or a methyl group, and Y represents a divalent linking group. As the divalent linking group, an oxygen atom, a sulfur atom or —N (R ⁵ ) — is preferable. R ⁵ is preferably a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, such as a methyl group, an ethyl group, a propyl group, or a butyl group. More preferred forms of R ⁵ are a hydrogen atom and a methyl group.
Y is more preferably an oxygen atom, —N (H) —, and —N (CH ₃ ) —.
R ⁴ is a poly (alkyleneoxy) group which may have a substituent, a straight chain having 1 to 20 carbon atoms which may have a substituent, a branched chain having 4 to 20 carbon atoms or a cyclic group having 3 to 20 carbon atoms. Represents an alkyl group.

Poly (alkyleneoxy) groups can be represented by (RO) x, R is an alkylene group having 2 to 4 carbon atoms, such as _{-CH 2 CH 2 -, - CH} 2 CH 2 CH 2 -, - CH It is preferably (CH ₃ ) CH ₂ — or CH (CH ₃ ) CH (CH ₃ ) —.
The alkyleneoxy units in the poly (alkyleneoxy) group may be the same as in poly (propyleneoxy), or two or more different types of alkyleneoxy may be randomly distributed. It may be present as a linear or branched propyleneoxy or ethyleneoxy unit, or a block of linear or branched propyleneoxy units and a block of ethyleneoxy units.
In this poly (alkyleneoxy) chain, a plurality of poly (alkyleneoxy) units are one or more chain bonds (for example, —CONH—Ph—NHCO—, —S—, etc., where Ph represents a phenylene group. ) Can be included. If the chain bond has a valence of 3 or more, this provides a means for obtaining branched alkyleneoxy units. When this polymer is used in the present invention, the molecular weight of the poly (alkyleneoxy) group is suitably 250 to 3000.

Examples of the linear alkyl group having 1 to 20 carbon atoms, the branched chain having 4 to 20 carbon atoms, or the cyclic group having 3 to 20 carbon atoms represented by R ⁴ include a methyl group, an ethyl group, Propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, octadecyl, eicosanyl, etc., cyclohexyl group Preferred are monocyclic cycloalkyl groups such as cycloheptyl group and polycyclic cycloalkyl groups such as bicycloheptyl group, bicyclodecyl group, tricycloundecyl group, tetracyclododecyl group, adamantyl group, norbornyl group, tetracyclodecyl group, etc. Used for.

Examples of the substituent of the poly (alkyleneoxy) group or alkyl group represented by R ⁴ include a hydroxyl group, an alkylcarbonyl group, an arylcarbonyl group, an alkylcarbonyloxy group, a carboxyl group, an alkyl ether group, an aryl ether group, a fluorine atom, Examples include, but are not limited to, halogen atoms such as chlorine atom and bromine atom, nitro group, cyano group and amino group.

  The monomer represented by the general formula (IV) is particularly preferably alkyl (meth) acrylate or poly (alkyleneoxy) (meth) acrylate.

  Specific examples of the monomer represented by the general formula (IV) are shown below, but not limited thereto.

Poly (alkyleneoxy) acrylates and methacrylates are commercially available hydroxypoly (alkyleneoxy) materials such as “Pluronic” (Pluronic (Asahi Denka Kogyo Co., Ltd.)), “Adeka Polyether” (Asahi Denka). "Carbowax" (Carbowax (Glico Product)), "Triton" (Triton (Rohm and Haas)) and "PEG" (Daiichi Kogyo) Can be produced by reacting what is sold as Pharmaceutical Co., Ltd.) with acrylic acid, methacrylic acid, acrylic chloride, methacrylic chloride, or acrylic anhydride in a known manner.
In addition, poly (oxyalkylene) diacrylate produced by a known method can also be used.

  The fluoroaliphatic group-containing polymer of the present invention includes a homopolymer of a monomer represented by the general formula (III) or a polymer of a monomer represented by the general formula (III) and a polyalkyleneoxy (meth) acrylate. Preferably, polyethyleneoxy (meth) acrylate or polypropyleneoxy (meth) acrylate is particularly preferably included.

  The polymer of the monomer represented by the general formula (III) and the monomer represented by the general formula (IV) used in the present invention is reacted by adding a monomer polymerizable with these in addition to the above monomers. It may be a polymer. A preferable polymerization ratio of the polymerizable monomer is 20 mol% or less, more preferably 10 mol% or less in all monomers. Such monomers include Polymer Handbook 2nd ed. , J .; Brandrup, Wiley lnterscience (1975) Chapter 2, Page 1-483 can be used. For example, compounds having one addition polymerizable unsaturated bond selected from acrylic acid, methacrylic acid, acrylic esters, methacrylic esters, acrylamides, methacrylamides, allyl compounds, vinyl ethers, vinyl esters, etc. Can give.

Specifically, the following monomers can be mentioned.
Acrylic esters:
Furfuryl acrylate, tetrahydrofurfuryl acrylate, etc.
Methacrylic acid esters:
Furfuryl methacrylate, tetrahydrofurfuryl methacrylate, etc.

Allyl compounds:
Allyl esters (eg allyl acetate, allyl caproate, allyl caprylate, allyl laurate, allyl palmitate, allyl stearate, allyl benzoate, allyl acetoacetate, allyl lactate, etc.), allyloxyethanol, etc.

Vinyl ethers:
Alkyl vinyl ethers (eg hexyl vinyl ether, octyl vinyl ether, decyl vinyl ether, ethyl hexyl vinyl ether, methoxyethyl vinyl ether, ethoxyethyl vinyl ether, chloroethyl vinyl ether, 1-methyl-2,2-dimethylpropyl vinyl ether, 2-ethylbutyl vinyl ether, hydroxyethyl vinyl ether, Diethylene glycol vinyl ether, dimethylaminoethyl vinyl ether, diethylaminoethyl vinyl ether, butylaminoethyl vinyl ether, benzyl vinyl ether, tetrahydrofurfuryl vinyl ether, etc.

Vinyl esters:
Vinyl bitylate, vinyl isobutyrate, vinyl trimethyl acetate, vinyl diethyl acetate, vinyl valerate, vinyl caproate, vinyl chloroacetate, vinyl dichloroacetate, vinyl methoxyacetate, vinyl butoxyacetate, vinyl lactate, vinyl-β-phenyl Butyrate, vinyl cyclohexyl carboxylate, etc.

Dialkyl itaconates:
Dialkyl or monoalkyl esters of fumaric acid such as dimethyl itaconate, diethyl itaconate, dibutyl itaconate, etc .:
Dibutyl fumarate, etc.Crotonic acid, itaconic acid, acrylonitrile, methacrylonitrile, maleilonitrile, styrene, etc.

The amount of the fluoroaliphatic group-containing monomer represented by the general formula (III) in the fluoroaliphatic group-containing polymer used in the present invention is 5 mol% or more, preferably 20 mol% of the total amount of constituent monomers of the polymer. % Or more, more preferably 30 mol% or more.
The amount of the monomer represented by the general formula (IV) in the fluoroaliphatic group-containing polymer of the present invention is 5 mol% or more, preferably 5 to 70 mol, of the total amount of constituent monomers of the fluoroaliphatic group-containing polymer. %, And more preferably 5 to 60 mol%.

The preferred weight average molecular weight of the fluoroaliphatic group-containing polymer used in the present invention is preferably from 3,000 to 100,000, more preferably from 6,000 to 80,000.
Furthermore, the preferred content of the fluoroaliphatic group-containing polymer according to the present invention relative to the coating composition (coating component excluding the solvent) mainly comprising a liquid crystalline compound is in the range of 0.005 to 8% by mass, Preferably it is the range of 0.01-1 mass%, More preferably, it is the range of 0.05-0.5 mass%. When the addition amount of the fluoroaliphatic group-containing polymer is 0.005% by mass or more, a better one can be obtained, and when it is 8% by mass or less, the coating film is sufficiently dried. It is possible to more effectively prevent disappearance and adverse effects on the performance as an optical film (for example, uniformity of retardation).

  The fluoroaliphatic group-containing polymer used in the present invention can be produced by a known and conventional method. For example, a general-purpose radical polymerization initiator is added and polymerized in an organic solvent containing monomers such as (meth) acrylate having a fluoroaliphatic group and (meth) acrylate having a polyalkyleneoxy group. Can be manufactured. Further, in some cases, other addition-polymerizable unsaturated compounds can be further added and produced by the same method as described above. Depending on the polymerizability of each monomer, a dropping polymerization method in which a monomer and an initiator are added dropwise to a reaction vessel is also effective for obtaining a polymer having a uniform composition.

  Hereinafter, although the example of the specific structure of the fluoro aliphatic group containing polymer used by this invention is shown, this invention is not limited to these. In addition, the number in a formula shows the mass percentage of each monomer component. Mw represents a weight average molecular weight.

(Method for producing optically anisotropic layer)
The method for producing an optically anisotropic layer of the present invention is a production method characterized by fixing a liquid crystalline compound in a hybrid alignment state, and at least a first alignment step for horizontally aligning the liquid crystalline compound, It comprises a second alignment step of hybrid-aligning the horizontally aligned liquid crystalline compound and an immobilization step of fixing the hybrid aligned liquid crystalline compound in its alignment state. In the production method of the present invention, the liquid crystalline compound is once horizontally aligned and then transferred to hybrid alignment, whereby the liquid crystal compound is rapidly transferred to hybrid alignment with few defects such as alignment defects.

  In the first and / or second alignment step, the liquid crystal compound can be horizontally aligned and / or hybrid aligned by supplying at least one of an electric field, a magnetic field, radiation and heat to the liquid crystal compound. For example, in the first and second alignment steps, the amount of energy supplied from the outside is changed (for example, when the alignment is performed by heating, the heating temperature is changed), or the type of energy supplied is changed. Thus, the alignment state of the liquid crystalline compound can be adjusted. Here, examples of the energy include heating, ultraviolet irradiation, (electric field, magnetic field) and the like. From the viewpoint of production suitability, in the first and second alignment steps, it is preferable to change from the horizontal alignment to the hybrid alignment by changing the heating temperature of the liquid crystalline compound.

  In the present invention, as described above, the liquid crystalline compound can be aligned in a desired alignment state by supplying energy from the outside, but by forming an optically anisotropic layer on the alignment film, or by liquid crystal The desired alignment state can also be achieved by adding a compound capable of controlling the alignment state of the organic compound (such as the compounds represented by the general formulas (I) and (II)) to the optically anisotropic layer. it can. In particular, by using an additive that promotes horizontal alignment, including a compound having a 1,3,5-triazine ring group, which will be described later, a hybrid alignment optically anisotropic layer with fewer defects can be produced more quickly. Therefore, it is preferable.

  The following method can be mentioned as a preferable aspect of the manufacturing method of the optically anisotropic layer of this invention.

In the presence of the compound represented by the general formula (I), the compound represented by the general formula (II), and the compound having a 1,3,5-triazine ring group, the liquid crystalline compound is heated at a temperature of T ₁ degree. A first alignment step of horizontally aligning at a time, a second alignment step of hybrid aligning the liquid crystalline compound at a temperature T ₂ degrees (where T ₁ <T ₂ ) after the _first alignment step, and hybrid alignment It is a manufacturing method of the optically anisotropic layer including the fixing process which fixes the liquid crystalline compound to the orientation state.

In the first alignment step, for example, a discotic liquid crystal, a compound represented by the general formula (I), a compound represented by the general formula (II), and a 1,3,5-triazine ring group are included. A compound and a solution in which a compound necessary for forming the optically anisotropic layer is appropriately dissolved in a solvent are applied on the alignment film and then dried. Subsequently, it heats to discotic nematic phase formation temperature, and also heats up to the temperature (T ₁ degree | times) which takes a horizontal alignment state in a liquid crystal phase state (1st alignment process). At the temperature T ₁ degree, the discotic liquid crystal is in a horizontal alignment state. Thereafter, the temperature is further raised to a high temperature region (T ₂ degrees) in the temperature range exhibiting the liquid crystal phase state, and the state is changed to the hybrid alignment state (second alignment step). Finally, it is polymerized by UV light irradiation or the like to fix the alignment state (fixing step). According to this manufacturing method, an optically anisotropic layer formed by hybrid alignment of discotic liquid crystals can be rapidly manufactured while suppressing the occurrence of schlieren defects.

In the production method, temperature control in the alignment process of the liquid crystal compound is important. The temperature (T ₁ °) exhibiting a horizontal alignment state, preferably 50 to 200 degrees, more preferably 70 to 200 degrees, 70 to 120 ° are particularly preferred. The temperature at which the horizontal alignment state is exhibited (T ₁ degree) is preferably lower than the temperature at which the hybrid alignment state is exhibited (T ₂ degrees). The temperature difference (T ₂ −T ₁ ) is preferably 10 degrees or more, and more preferably 20 degrees or more. T ₁ and T ₂ degrees are temperatures measured as the film surface temperature of the optically anisotropic layer.

The temperature at which the liquid crystal compound exhibits a horizontally aligned state can be arbitrarily controlled by the type and amount of the liquid crystal compound and additives described later, and set T ₁ degree and T ₂ degree accordingly. Can do. The time for maintaining the respective temperature of _one degree and T ₂ ° T, and the time of changing the T ₂ ° ₁ ° T, depending on the type of liquid crystal compounds, can be appropriately set, Preferably, it is 10 seconds to 2 minutes.

  Next, the compound having a 1,3,5-triazine ring group used in the production method of the present invention will be described in detail. The compound having a 1,3,5-triazine ring group that can be used in the present invention is preferably a compound represented by the following general formula (V) or (VI).

一般式（V）において、Ｌ¹、Ｌ²及びＬ³は、単結合又は二価の連結基を表し、それぞれ同一でも異なっていても良い。Ａ¹、Ａ²及びＡ³はアルキレン基を表し、それぞれ同一でも異なっていてもよい。ｍ₂、ｍ₃及びｍ₄は０以上の整数を表す。好ましくは、ｍ₂、ｍ₃及びｍ₄は、（０〜５）の整数である。Ｒ¹⁰、Ｒ¹¹及びＲ¹²は有機基であり、それぞれ同一でも異なっていてもよい。ｍ₂が０の時、Ｒ¹⁰はアルキル基であり、ｍ₃が０の時、Ｒ¹¹はアルキル基であり、ｍ₄が０の時、Ｒ¹²はアルキル基である。 General formula (V)

In the general formula (V), L ¹ , L ² and L ³ represent a single bond or a divalent linking group, and may be the same or different. A ¹ , A ² and A ³ represent an alkylene group, and may be the same or different. m ₂ , m ₃ and m ₄ represent an integer of 0 or more. Preferably, m _2, m ₃ and m ₄ is an integer from (0 to 5). R ¹⁰ , R ¹¹ and R ¹² are organic groups, which may be the same or different. When m ₂ is 0, R ¹⁰ is an alkyl group, when m ₃ is 0, R ¹¹ is an alkyl group, and when m ₄ is 0, R ¹² is an alkyl group.

一般式（VI）において、Ｘ⁴、Ｙ⁴はＮＲ^a（Ｒ^aは水素原子又はアルキル基を表す）、Ｏ、Ｓのいずれかを表し、それぞれ、同一でも異なっていてもよい。Ｚ⁴は二価の連結基をあらわす。Ｒ¹³、Ｒ¹⁴、Ｒ¹⁵及びＲ¹⁶は置換基を表し、それぞれ同一でも異なっていてもよい。 General formula (VI)

In the general formula (VI), X ⁴ and Y ^{4 each} represent NR ^a (R ^a represents a hydrogen atom or an alkyl group), O, or S, and may be the same or different. Z ⁴ represents a divalent linking group. R ¹³ , R ¹⁴ , R ¹⁵ and R ¹⁶ each represent a substituent and may be the same or different.

First, the compound represented by the general formula (VI) will be described in detail.
Examples of the divalent linking group represented by each of L ¹ , L ² and L ³ include, for example, —CO—, —NRa— (Ra is an alkyl group or a hydrogen atom), —O—, —S—, — SO -, - SO ₂ - and is preferably a divalent linking group selected from the group consisting of a combination thereof. More preferably, it is a combination of at least two divalent linking groups selected from —CO—, —NRa—, —O—, —S—, —SO ₂ — and groups thereof. More preferably, it is a combination of 2 or 3 divalent linking groups selected from —CO—, —NRa—, —O—, —S—, —SO ₂ — and groups thereof. Most preferably, it is a combination of 2 or 3 divalent linking groups selected from —NRa—, —O—, —S— and the group thereof.

A ¹ , A ² and A ³ are alkylene groups (linear or branched substituted or unsubstituted alkylene groups, preferably alkylene groups having 2 to 30 carbon atoms, such as —CH ₂ —, — (CH ₂ ). _{2 -, - CH 2 CH (} CH 3) -, - CH 2 C (CH 3) 2 -, - a) - (CH _{2) 4.} Preferably _{- (CH 2) 2 -,} - CH 2 CH (CH 3) -, - (CH 2) 4 - a.

m _2, m ₃ and m ₄ represent an integer of 0 or more, preferably 1-10, more preferably 1-5.

The organic group represented by each of R ¹⁰ , R ¹¹ and R ¹² is an alkyl group (a linear or branched substituted or unsubstituted alkyl group, preferably an alkyl group having 1 to 30 carbon atoms such as methyl Group, ethyl group, n-propyl group, isopropyl group, t-butyl group, n-octyl group, dodecyl group, eicosyl group, 2-chloroethyl group, 2-cyanoethyl group, 2-ethylhexyl group, 2-hexyldecyl group, 2-octyldodecyl group, 3- (2,4-di-t-amylphenoxy) propyl group,

A cycloalkyl group (preferably a substituted or unsubstituted cycloalkyl group having 3 to 30 carbon atoms, such as a cyclohexyl group, a cyclopentyl group, a 4-n-dodecylcyclohexyl group, and a multicycloalkyl group such as a bicycloalkyl group. A group (preferably a substituted or unsubstituted bicycloalkyl group having 5 to 30 carbon atoms, such as a bicyclo (1.2.2) heptan-2-yl group, bicyclo (2.2.2) octane-3- Yl group), tricycloalkyl groups, and the like, preferably monocyclic cycloalkyl groups and bicycloalkyl groups, and monocyclic cycloalkyl groups are particularly preferred.

An alkenyl group (a linear or branched substituted or unsubstituted alkenyl group, preferably an alkenyl group having 2 to 30 carbon atoms, such as vinyl group, allyl group, prenyl group, geranyl group, oleyl group), cycloalkenyl A group (preferably a substituted or unsubstituted cycloalkenyl group having 3 to 30 carbon atoms such as 2-cyclopenten-1-yl group, 2-cyclohexen-1-yl group, polycycloalkenyl group, preferably carbon A substituted or unsubstituted bicycloalkenyl group having a number of 5 to 30; for example, a bicyclo (2.2.1) hept-2-en-1-yl group, a bicyclo (2.2.2) oct-2-ene- A 4-yl group or a tricycloalkenyl group, particularly preferably a monocyclic cycloalkenyl group), an alkynyl group (preferably a substituted or substituted group having 2 to 30 carbon atoms). Unsubstituted alkynyl groups, such as ethynyl group, propargyl group, trimethylsilyl ethynyl group),

An aryl group (preferably a substituted or unsubstituted aryl group having 6 to 30 carbon atoms such as a phenyl group, p-tolyl group, naphthyl group, m-chlorophenyl group, o-hexadecanoylaminophenyl group, o-2- (Perfluorohexyl) ethoxyphenyl group, o-3- (perfluorohexyl) propyloxyphenyl group, o-2- (6H-dodecafluorohexyl) ethoxyphenyl group, o- (8H-hexadecafluorooctyl) methoxyphenyl Group), a heterocyclic group (preferably a 5- to 7-membered substituted or unsubstituted, saturated or unsaturated, aromatic or non-aromatic, monocyclic or condensed heterocyclic group, more preferably a ring-constituting atom. Is selected from a carbon atom, a nitrogen atom and a sulfur atom, and a hetero atom of any one of a nitrogen atom, an oxygen atom and a sulfur atom And more preferably a 5- or 6-membered aromatic heterocyclic group having 3 to 30 carbon atoms, such as a 2-furyl group, a 2-thienyl group, a 2-pyridyl group, 4-pyridyl group, 2-pyrimidinyl group, 2-benzothiazolyl group) and the like.

The organic group represented by each of R ¹⁰ , R ¹¹ and R ¹² may have a substituent, and examples of the substituent include the aromatic heterocyclic group or aromatic carbon represented by Ar in the general formula (I). It is synonymous with the group mentioned as a substituent of a hydrogen ring group, The preferable range is also the same. The substituent of the organic group represented by each of R ¹⁰ , R ¹¹ and R ¹² is particularly preferably a substituted or unsubstituted alkyl group or a substituted or unsubstituted aryl group.

  Particularly preferably, the general formula (V) is the following general formula (Va).

一般式（Va）において、Ａ¹、Ａ²及びＡ³はアルキレン基を表し、それぞれ同一でも異なっていても良い。ｍ₂、ｍ₃及びｍ₄は０以上の整数を表す。Ｒ¹⁰、Ｒ¹¹及びＲ¹²は有機基であり、それぞれ同一でも異なっていても良い。ｍ₂が０の時、Ｒ¹⁰はアルキル基であり、ｍ₃が０の時、Ｒ¹¹はアルキル基であり、ｍ₄が０の時、Ｒ¹²はアルキル基である。 General formula (Va)

In the general formula (Va), A ¹ , A ² and A ³ represent an alkylene group, which may be the same or different. m ₂ , m ₃ and m ₄ represent an integer of 0 or more. R ¹⁰ , R ¹¹ and R ¹² are organic groups, which may be the same or different. When m ₂ is 0, R ¹⁰ is an alkyl group, when m ₃ is 0, R ¹¹ is an alkyl group, and when m ₄ is 0, R ¹² is an alkyl group.

In the general formula (Va), A ¹ , A ² and A ³ , m2, m3 and m4, R ¹⁰ , R ¹¹ and R ¹² are synonymous with those shown in the general formula (V), and preferred ranges are also the same. .

Next, the compound represented by the general formula (VI) will be described in detail.
The divalent linking group represented by Z ₄ is composed of an alkylene group, an alkenylene group, a divalent aryl group, a divalent heterocyclic group, —CO—, —SO—, —SO ₂ —, and combinations thereof. A divalent linking group selected from the group is preferred.

The substituent represented by each of R ¹³ , R ¹⁴ , R ¹⁵ and R ¹⁶ is an alkyl group (a linear or branched substituted or unsubstituted alkyl group, preferably an alkyl group having 1 to 30 carbon atoms). For example, methyl group, ethyl group, n-propyl group, isopropyl group, t-butyl group, n-octyl group, dodecyl group, eicosyl group, 2-chloroethyl group, 2-cyanoethyl group, 2-ethylhexyl group, 2-to Xyldecyl group, 2-octyldodecyl group, 3- (2,4-di-t-amylphenoxy) propyl) group, cycloalkyl group (preferably a substituted or unsubstituted cycloalkyl group having 3 to 30 carbon atoms, such as Cyclohexyl group, cyclopentyl group, 4-n-dodecylcyclohexyl group, and polycycloalkyl group such as bicycloalkyl group (preferably carbon A substituted or unsubstituted bicycloalkyl group having a number of 5 to 30, for example, a bicyclo (1.2.2) heptan-2-yl group, a bicyclo (2.2.2) octane-3-yl group) or a tricyclo And a group having a polycyclic structure such as an alkyl group, preferably a monocyclic cycloalkyl group or a bicycloalkyl group, and a monocyclic cycloalkyl group is preferred.

An alkenyl group (a linear or branched substituted or unsubstituted alkenyl group, preferably an alkenyl group having 2 to 30 carbon atoms, such as vinyl group, allyl group, prenyl group, geranyl group, oleyl group), cycloalkenyl Group (preferably a substituted or unsubstituted cycloalkenyl group having 3 to 30 carbon atoms, such as 2-cyclopenten-1-yl group and 2-cyclohexen-1-yl group, and polycycloalkenyl group such as A bicycloalkenyl group (preferably a substituted or unsubstituted bicycloalkenyl group having 5 to 30 carbon atoms such as bicyclo (2.2.1) hept-2-en-1-yl group, bicyclo (2.2 .2) Oct-2-en-4-yl group) or tricycloalkenyl group, and a monocyclic cycloalkenyl group is preferable). Cycloalkenyl group (preferably a substituted or unsubstituted alkynyl group having 2 to 30 carbon atoms, such as ethynyl group, propargyl group, trimethylsilyl ethynyl group),

An aryl group (preferably a substituted or unsubstituted aryl group having 6 to 30 carbon atoms such as a phenyl group, p-tolyl group, naphthyl group, m-chlorophenyl group, o-hexadecanoylaminophenyl group, o-2- (Perfluorohexyl) ethoxyphenyl group, o-3- (perfluorohexyl) propyloxyphenyl group, o-2- (6H-dodecafluorohexyl) ethoxyphenyl, o- (8H-hexadecafluorooctyl) methoxyphenyl group ), A heterocyclic group (preferably a 5- to 7-membered substituted or unsubstituted, saturated or unsaturated, aromatic or non-aromatic, monocyclic or condensed heterocyclic group, more preferably the ring-constituting atoms are A hetero atom selected from a carbon atom, a nitrogen atom and a sulfur atom, and any one of a nitrogen atom, an oxygen atom and a sulfur atom A heterocyclic group having at least one, more preferably a 5- or 6-membered aromatic heterocyclic group having 3 to 30 carbon atoms, such as a 2-furyl group, a 2-thienyl group, a 2-pyridyl group, 4-pyridyl group, 2-pyrimidinyl group, 2-benzothiazolyl group), cyano group, hydroxyl group, nitro group, carboxyl group,

An alkoxy group (preferably a substituted or unsubstituted alkoxy group having 1 to 30 carbon atoms such as methoxy group, ethoxy group, isopropoxy group, t-butoxy group, n-octyloxy group, 2-methoxyethoxy group, 1H, 1H, 9H-hexadecafluorononanoxy group, 2-perfluorohexylethoxy group), an aryloxy group (preferably a substituted or unsubstituted aryloxy group having 6 to 30 carbon atoms, such as a phenoxy group, 2-methylphenoxy group, 2,4-di-t-amylphenoxy group, 4-t-butylphenoxy group, 3-nitrophenoxy group, 2-tetradecanoylaminophenoxy group, o-2- (perfluorohexyl) Ethoxyphenoxy group, o-3- (perfluorohexyl) propyloxyphenoxy group, o-2- (6H Dodecafluorohexyl) ethoxyphenoxy group, o- (8H-hexadecafluorooctyl) methoxyphenoxy group), silyloxy group (preferably a silyloxy group having 3 to 20 carbon atoms, for example, trimethylsilyloxy group, t-butyldimethylsilyl group) An oxy group), a heterocyclic oxy group (preferably a substituted or unsubstituted heterocyclic oxy group having 2 to 30 carbon atoms, and the heterocyclic portion is preferably a heterocyclic portion described in the above heterocyclic group, for example, 1-phenyltetrazole-5-oxy group, 2-tetrahydropyranyloxy group),

Acyloxy group (preferably formyloxy group, substituted or unsubstituted alkylcarbonyloxy group having 2 to 30 carbon atoms, substituted or unsubstituted arylcarbonyloxy group having 6 to 30 carbon atoms, such as formyloxy group, acetyl An oxy group, a pivaloyloxy group, a stearoyloxy group, a benzoyloxy group, a p-methoxyphenylcarbonyloxy group), a carbamoyloxy group (preferably a substituted or unsubstituted carbamoyloxy group having 1 to 30 carbon atoms such as N, N-dimethylcarbamoyloxy group, N, N-diethylcarbamoyloxy group, morpholinocarbonyloxy group, N, N-di-n-octylaminocarbonyloxy group, Nn-octylcarbamoyloxy group), alkoxycarbonyloxy group ( Preferably, A substituted or unsubstituted alkoxycarbonyloxy group having 2 to 30 primes, for example, a methoxycarbonyloxy group, an ethoxycarbonyloxy group, a t-butoxycarbonyloxy group, an n-octylcarbonyloxy group), an aryloxycarbonyloxy group (preferably, A substituted or unsubstituted aryloxycarbonyloxy group having 7 to 30 carbon atoms, such as phenoxycarbonyloxy group, p-methoxyphenoxycarbonyloxy group, pn-hexadecyloxyphenoxycarbonyloxy group),

An amino group (preferably an amino group, a substituted or unsubstituted alkylamino group having 1 to 30 carbon atoms, a substituted or unsubstituted arylamino group having 6 to 30 carbon atoms, or a heterocyclic amino group having 0 to 30 carbon atoms); Yes, for example, amino group, methylamino group, dimethylamino group, 3-perfluorohexylpropylamino group, 3- (2,4-di-t-amylphenoxy) propylamino group, 3- (2-ethylhexyloxy) Propylamino group, 3- (2-hexyldecanooxy) propylamino group, 3-dodecyloxypropylamino group, 3- (3-perfluorohexylpropyloxy) propylamino group, 3- (3- (6H-par Fluorohexyl) propyloxy) propylamino group, anilino group, N-methyl-anilino group, diphenylamino group, 2- Tyloxyanilino group, 2- (3-perfluorohexylpropyloxy) anilino group, 2- (2-perfluorobutylethyloxy) anilino group, 2,4-di (2-perfluorohexylethyloxy) anilino group 2- (6H-perfluorohexylmethyloxy) anilino group, 3,4-di (3-perfluorohexylpropyloxy) anilino group, N-1,3,5-triazin-2-ylamino group), acylamino group (Preferably a formylamino group, a substituted or unsubstituted alkylcarbonylamino group having 1 to 30 carbon atoms, a substituted or unsubstituted arylcarbonylamino group having 6 to 30 carbon atoms, such as formylamino group, acetylamino Group, pivaloylamino group, lauroylamino group, benzoylamino group, 3,4,5-toluene -N-octyloxyphenylcarbonylamino group), aminocarbonylamino group (preferably a substituted or unsubstituted aminocarbonylamino group having 1 to 30 carbon atoms, such as carbamoylamino group, N, N-dimethylaminocarbonylamino group) , N, N-diethylaminocarbonylamino group, morpholinocarbonylamino group), alkoxycarbonylamino group (preferably a substituted or unsubstituted alkoxycarbonylamino group having 2 to 30 carbon atoms, for example, methoxycarbonylamino group, ethoxycarbonylamino group) T-butoxycarbonylamino group, n-octadecyloxycarbonylamino group, N-methyl-methoxycarbonylamino group),

Aryloxycarbonylamino group (preferably a substituted or unsubstituted aryloxycarbonylamino group having 7 to 30 carbon atoms such as phenoxycarbonylamino group, p-chlorophenoxycarbonylamino group, mn-octyloxyphenoxycarbonyl Amino group), sulfamoylamino group (preferably a substituted or unsubstituted sulfamoylamino group having 0 to 30 carbon atoms, such as sulfamoylamino group, N, N-dimethylaminosulfonylamino group, N -N-octylaminosulfonylamino group), alkyl and arylsulfonylamino groups (preferably substituted or unsubstituted alkylsulfonylamino groups having 1 to 30 carbon atoms, substituted or unsubstituted arylsulfonylamino groups having 6 to 30 carbon atoms) For example, methyls Honiruamino group, butylsulfonyl group, phenylsulfonylamino group, 2,3,5-trichlorophenyl sulfonylamino group, p- methylphenyl sulfonylamino group), a mercapto group,

An alkylthio group (preferably a substituted or unsubstituted alkylthio group having 1 to 30 carbon atoms, such as a methylthio group, an ethylthio group or an n-hexadecylthio group), an arylthio group (preferably a substituted or unsubstituted group having 6 to 30 carbon atoms); An arylthio group, for example, a phenylthio group, a p-chlorophenylthio group, an m-methoxyphenylthio group), a heterocyclic thio group (preferably a substituted or unsubstituted heterocyclic thio group having 2 to 30 carbon atoms, Is preferably a heterocyclic moiety described in the above heterocyclic group, for example, 2-benzothiazolylthio group, 1-phenyltetrazol-5-ylthio group), sulfamoyl group (preferably a substituent having 0 to 30 carbon atoms or An unsubstituted sulfamoyl group such as N-ethylsulfamoyl group, N- (3-dodecyloxypropyl) Pills) sulfamoyl group, N, N- dimethyl sulfamoyl mottle, N- acetyl sulfamoyl group, N- benzoylsulfamoyl group, N- (N'-phenylcarbamoyl) sulfamoyl group), a sulfo group,

An alkyl group and an arylsulfinyl group (preferably a substituted or unsubstituted alkylsulfinyl group having 1 to 30 carbon atoms, a substituted or unsubstituted arylsulfinyl group having 6 to 30 carbon atoms, such as a methylsulfinyl group, an ethylsulfinyl group, Phenylsulfinyl group, p-methylphenylsulfinyl group), alkyl and arylsulfonyl groups (preferably substituted or unsubstituted alkylsulfonyl groups having 1 to 30 carbon atoms, substituted or unsubstituted arylsulfonyl groups having 6 to 30 carbon atoms). , For example, methylsulfonyl group, ethylsulfonyl group, phenylsulfonyl group, p-methylphenylsulfonyl group), acyl group (preferably formyl group, substituted or unsubstituted alkylcarbonyl group having 2 to 30 carbon atoms, 7 to 7 carbon atoms) 30 substituted or unsubstituted arylcals For example, acetyl group, pivaloyl group, 2-chloroacetyl group, stearoyl group, benzoyl group, pn-octyloxyphenylcarbonyl group), aryloxycarbonyl group (preferably having 7 to 30 carbon atoms) Substituted or unsubstituted aryloxycarbonyl group such as phenoxycarbonyl group, o-chlorophenoxycarbonyl group, m-nitrophenoxycarbonyl group, pt-butylphenoxycarbonyl group), halogen atom (for example, chlorine atom, bromine) Atoms, iodine atoms),

An alkoxycarbonyl group (preferably a substituted or unsubstituted alkoxycarbonyl group having 2 to 30 carbon atoms such as methoxycarbonyl group, ethoxycarbonyl group, t-butoxycarbonyl group, n-octadecyloxycarbonyl group), carbamoyl group (preferably Is a substituted or unsubstituted carbamoyl group having 1 to 30 carbon atoms, such as a carbamoyl group, N-methylcarbamoyl group, N, N-dimethylcarbamoyl group, N, N-di-n-octylcarbamoyl group, N- ( Methylsulfonyl) carbamoyl group), aryl group and heterocyclic azo group (preferably substituted or unsubstituted arylazo group having 6 to 30 carbon atoms, substituted or unsubstituted heterocyclic azo group having 3 to 30 carbon atoms (heterocyclic moiety) Is preferably a heterocyclic moiety described in the above heterocyclic group), eg For example, a phenylazo group, p-chlorophenylazo group, 5-ethylthio-1,3,4-thiadiazol-2-ylazo group), an imide group (preferably a substituted or unsubstituted imide group having 2 to 30 carbon atoms, For example, N-succinimide group, N-phthalimide group), phosphino group (preferably a substituted or unsubstituted phosphino group having 2 to 30 carbon atoms, such as dimethylphosphino group, diphenylphosphino group, methylphenoxyphosphino group) A phosphinyl group (preferably a substituted or unsubstituted phosphinyl group having 2 to 30 carbon atoms, such as a phosphinyl group, a dioctyloxyphosphinyl group, a diethoxyphosphinyl group),

Phosphinyloxy group (preferably a substituted or unsubstituted phosphinyloxy group having 2 to 30 carbon atoms, such as diphenoxyphosphinyloxy group, dioctyloxyphosphinyloxy group), phosphinylamino A group (preferably a substituted or unsubstituted phosphinylamino group having 2 to 30 carbon atoms, such as a dimethoxyphosphinylamino group or a dimethylaminophosphinylamino group), a silyl group (preferably a carbon number of 3 -30 substituted or unsubstituted silyl groups, for example, trimethylsilyl group, t-butyldimethylsilyl group, phenyldimethylsilyl group).

  Among the above functional groups, those having a hydrogen atom may be substituted with the above groups by removing this. Examples of such a functional group include an alkylcarbonylaminosulfonyl group, an arylcarbonylaminosulfonyl group, an alkylsulfonylaminocarbonyl group, and an arylsulfonylaminocarbonyl group. Specifically, a methylsulfonylaminocarbonyl group, p- Examples include methylphenylsulfonylaminocarbonyl group, acetylaminosulfonyl group, and benzoylaminosulfonyl group.

  These substituents may be further substituted with these substituents. Further, when two or more substituents are present, they may be the same or different. If possible, they may be bonded to each other to form a ring.

R ¹³ , R ¹⁴ , R ¹⁵ and R ¹⁶ are preferably a substituted or unsubstituted amino group, an alkylamino group, an arylamino group or a heterocyclic amino group, more preferably a substituted or unsubstituted alkylamino group. (For example, methylamino group, dimethylamino group, 3-perfluorohexylpropylamino group, 3- (2,4-di-t-amylphenoxy) propylamino group, 3- (2-ethylhexyloxy) propylamino group, 3 -(2-hexyldecanooxy) propylamino group, 3-dodecyloxypropylamino group, 3- (3-perfluorohexylpropyloxy) propylamino group, 3- (3- (6H-perfluorohexyl) propyloxy ) Propylamino) group, arylamino group (for example, anilino group, N-methyl-anilino group, diphenyla) Group, 2-methyloxyanilino group, 2- (3-perfluorohexylpropyloxy) anilino group, 2- (2-perfluorobutylethyloxy) anilino group, 2,4-di (2-perfluorohexyl) Ethyloxy) anilino group, 2- (6H-perfluorohexylmethyloxy) anilino group, 3,4-di (3-perfluorohexylpropyloxy) anilino group). Examples of the substituent include the examples given as the substituents for R ¹³ , R ¹⁴ , R ¹⁵ and R ¹⁶ described above.

  Particularly preferably, the general formula (VI) is the following general formula (VIa).

一般式（VIa）において、Ｚ⁵はポリ（アルキレンオキシ）基を表し、Ｒａは水素原子又はアルキル基を表し、Ｒ¹⁷、Ｒ¹⁸、Ｒ¹⁹及びＲ²⁰は置換基を表し、それぞれ同一でも異なっていてもよい。ｊ１、ｊ２、ｊ３及びｊ４はそれぞれ０〜５の整数をあらわし、ｊ１、ｊ２、ｊ３及びｊ４が２以上のとき複数の、Ｒ¹⁷、Ｒ¹⁸、Ｒ¹⁹及びＲ²⁰はそれぞれ同一でも異なっていてもよく、互いに結合して環を形成してもよい。 General formula (VIa)

In the general formula (VIa), Z ⁵ represents a poly (alkyleneoxy) group, Ra represents a hydrogen atom or an alkyl group, R ¹⁷ , R ¹⁸ , R ¹⁹ and R ²⁰ represent substituents, which are the same or different. It may be. j1, j2, j3 and j4 each represent an integer of 0 to 5, and when j1, j2, j3 and j4 are 2 or more, a plurality of R ¹⁷ , R ¹⁸ , R ¹⁹ and R ²⁰ are the same or different. Alternatively, they may be bonded to each other to form a ring.

  j1, j2, j3, and j4 each represent an integer of 0-5. Preferably, it is an integer of 1, 2, 3.

Examples of the substituents represented by R ¹⁷ , R ¹⁸ , R ¹⁹ and R ²⁰ include the groups listed as R ¹³ , R ¹⁴ , R ¹⁵ and R ¹⁶ in the general formula (VI). A substituted or unsubstituted alkoxy group, an alkylthio group, an alkylamino group, and an arylamino group are preferable. More preferably, it is a substituted or unsubstituted alkoxy group (for example, methoxy group, ethoxy group, isopropoxy group, t-butoxy group, n-octyloxy group, 2-methoxyethoxy group, 1H, 1H, 9H-hexadecafluorononano Xyl group, 2-perfluorohexylethoxy group, 3-perfluorohexylpropyloxy group, 2-perfluorobutylethyloxy group, 6H-perfluorohexylmethyloxy group).

  Specific examples of the compound having a 1,3,5-triazine ring group are shown below, but the compound used in the present invention is not limited thereto.

  In the present invention, the addition amount of the compound having a 1,3,5-triazine ring group is preferably 0.01 to 20% by mass of the amount of the liquid crystal compound (preferably a discotic liquid crystal compound), 0.05 10 mass% is more preferable, and 0.1-5 mass% is further more preferable.

The constituent materials necessary for the optical film will be described below.
(Support)
The support of the present invention is preferably glass or a transparent polymer film (transparent support).
The support preferably has a light transmittance of 80% or more. Examples of the polymer constituting the polymer film include cellulose esters (eg, cellulose acetate, cellulose diacetate), norbornene-based polymers, and polymethyl methacrylate. A commercially available polymer (for norbornene polymers, both Arton and Zeonex are trade names)) may be used.
Among these, cellulose esters are preferable, and lower fatty acid esters of cellulose are more preferable. Lower fatty acid means a fatty acid having 6 or less carbon atoms. In particular, the number of carbon atoms is preferably 2 (cellulose acetate), 3 (cellulose propionate) or 4 (cellulose butyrate). Cellulose acetate is particularly preferred. Mixed fatty acid esters such as cellulose acetate propionate and cellulose acetate butyrate may be used.

In addition, even a conventionally known polymer such as polycarbonate or polysulfone that easily develops birefringence can be improved in birefringence by modifying the molecule as described in, for example, WO00 / 26705. If controlled, it can also be used in the optical film of the present invention.
When the optical film of the present invention is used for a polarizing plate protective film or a retardation film, it is preferable to use cellulose acetate having an acetylation degree of 55.0 to 62.5% as the polymer film. The acetylation degree is more preferably 57.0 to 62.0%.

The degree of acetylation means the amount of bound acetic acid per unit mass of cellulose. The degree of acetylation is determined by measurement and calculation of the degree of acetylation in ASTM: D-817-91 (testing method for cellulose acetate, etc.).
The viscosity average degree of polymerization (DP) of cellulose acetate is preferably 250 or more, and more preferably 290 or more. Cellulose acetate preferably has a narrow molecular weight distribution of Mw / Mn (Mw is a mass average molecular weight, Mn is a number average molecular weight) by gel permeation chromatography. The specific value of Mw / Mn is preferably 1.0 to 1.7, more preferably 1.0 to 1.65, and most preferably 1.0 to 1.6. preferable.

In cellulose acetate, the hydroxyl groups at the 2-position, 3-position and 6-position of cellulose are not evenly substituted, but the substitution degree at the 6-position tends to be small. In the polymer film used in the present invention, it is preferable that the 6-position substitution degree of cellulose is the same as or higher than that of the 2-position and 3-position.
The ratio of the substitution degree at the 6-position to the total substitution degree at the 2-position, the 3-position, and the 6-position is preferably 30 to 40%, more preferably 31 to 40%, and more preferably 32 to 40%. Most preferably it is. The substitution degree at the 6-position is preferably 0.88 or more.
The degree of substitution at each position can be measured by NMR.
Cellulose acetate having a high degree of substitution at the 6-position is described in Synthesis Example 1 described in Paragraph Nos. 0043 to 0044, Synthesis Example 2 described in Paragraph Nos. 0048 to 0049, and Paragraph Nos. 0051 to 0052. It can be synthesized with reference to the method of Synthesis Example 3.

When a polymer film is used for the optical compensation sheet, the polymer film preferably has a desired retardation value. The Re retardation value and Rth retardation value of the film are defined by the following formulas (1) and (2), respectively.
Formula (1) Re = | nx−ny | × d
Formula (2) Rth = {(nx + ny) / 2−nz} × d
In equations (1) and (2), nx is the refractive index in the slow axis direction in the film plane (the direction in which the refractive index is maximum), and ny is the fast axis direction in the film plane (the refractive index is minimum). Nz is the refractive index in the thickness direction of the film, and d is the thickness of the film with the unit of nm.
The preferred range of the polymer film retardation value varies depending on the liquid crystal cell in which the optical compensation film is used and the method of use thereof, but the Re retardation value is 0 to 200 nm, and the Rth retardation value is in the range of 70 to 400 nm. It is preferable to adjust.

  When two optically anisotropic layers are used in the liquid crystal display device, the Rth retardation value of the polymer film is preferably in the range of 70 to 250 nm. When one optically anisotropic layer is used in the liquid crystal display device, the Rth retardation value of the substrate is preferably in the range of 150 to 400 nm.

  In addition, it is preferable that the birefringence ((DELTA) n: nx-ny) of a base film exists in the range of 0.00028-0.020. The birefringence {(nx + ny) / 2−nz} in the thickness direction of the cellulose acetate film is preferably in the range of 0.001 to 0.04.

  In order to adjust the retardation of the polymer film, a method of applying an external force such as stretching is generally used, but a retardation increasing agent for adjusting the optical anisotropy is optionally added. In order to adjust the retardation of the cellulose acylate film, it is preferable to use an aromatic compound having at least two aromatic rings as a retardation increasing agent. The aromatic compound is preferably used in the range of 0.01 to 20 parts by mass with respect to 100 parts by mass of cellulose acylate. Two or more aromatic compounds may be used in combination. The aromatic ring of the aromatic compound includes an aromatic hetero ring in addition to the aromatic hydrocarbon ring. Examples thereof include compounds described in European Patent 0911656A2, JP-A Nos. 2000-1111914 and 2000-275434.

Furthermore, the hygroscopic expansion coefficient of the cellulose acetate film used in the optical compensation sheet of the present invention is preferably 30 × 10 ⁻⁵ /% RH or less. The hygroscopic expansion coefficient is preferably 15 × 10 ⁻⁵ /% RH or less, and more preferably 10 × 10 ⁻⁵ /% RH or less. The hygroscopic expansion coefficient is preferably small, but usually it is 1.0 × 10 ⁻⁵ /% RH or more.
The hygroscopic expansion coefficient indicates the amount of change in the length of the sample when the relative humidity is changed at a constant temperature.
By adjusting the hygroscopic expansion coefficient, it is possible to prevent a frame-like transmittance increase (light leakage due to distortion) while maintaining the optical compensation function of the optical compensation sheet.
The method for measuring the hygroscopic expansion coefficient is shown below. The produced polymer film has a width of 5 mm. A sample with a length of 20 mm was cut out, and one end was fixed and hung in an atmosphere of 20 degrees RH (R ⁰ ) at 25 degrees. A weight of 0.5 g was hung from the other end and left for 10 minutes to measure the length (L ⁰ ). Next, the length (L ¹ ) was measured while the temperature was kept at 25 ° C. and the humidity was 80% RH (R ¹ ). The hygroscopic expansion coefficient was calculated by the following equation. The measurement was performed 10 samples for the same sample, and an average value was adopted.
Hygroscopic expansion coefficient [/% RH] = {(L ¹ −L ⁰ ) / L ⁰ } / (R ¹ −R ⁰ )

  In order to reduce the dimensional change due to moisture absorption of the polymer film, it is preferable to add a compound having a hydrophobic group or fine particles. As the compound having a hydrophobic group, a corresponding material among plasticizers and deterioration inhibitors having a hydrophobic group such as an aliphatic group or an aryl group in the molecule is particularly preferably used. It is preferable that the addition amount of these compounds exists in the range of 0.01-10 mass% with respect to the solution (dope) to adjust. Further, the free volume in the polymer film may be reduced. Specifically, the smaller the amount of residual solvent during film formation by the solvent casting method described later, the smaller the free deposition. It is preferable to dry under the condition that the residual solvent amount with respect to the cellulose acetate film is in the range of 0.01 to 1.00% by mass.

  The above-mentioned additives to be added to the polymer film, or additives that can be added according to various purposes (for example, UV inhibitors, release agents, antistatic agents, deterioration inhibitors (eg, antioxidants, peroxide decomposers) , Radical inhibitors, metal deactivators, acid scavengers, amines, infrared absorbers, etc.) may be solid or oily. Moreover, when a film is formed from a multilayer, the kind and addition amount of the additive of each layer may differ. For these details, the materials described in detail on pages 16 to 22 of the technique No. 2001-1745 described above are preferably used. The amount of these additives to be used is not particularly limited as long as the amount of each material is manifested, but it is preferably used as appropriate in the range of 0.001 to 25% by mass in the entire polymer film composition.

(Method for producing polymer film)
The polymer film is preferably produced by a solvent cast method. In the solvent cast method, a film is produced using a solution (dope) in which a polymer material is dissolved in an organic solvent.
The dope is cast on a drum or band, and the solvent is evaporated to form a film. The concentration of the dope before casting is preferably adjusted so that the solid content is 18 to 35%. The surface of the drum or band is preferably finished in a mirror state.
The dope is preferably cast on a drum or band having a surface temperature of 10 degrees or less. After casting, it is preferable to dry it by applying air for 2 seconds or more. The obtained film can be peeled off from the drum or band and further dried with high-temperature air whose temperature is successively changed to 100 to 160 degrees to evaporate the residual solvent. The above method is described in Japanese Patent Publication No. 5-17844. According to this method, it is possible to shorten the time from casting to stripping. In order to carry out this method, it is necessary for the dope to gel at the surface temperature of the drum or band during casting.

In the casting step, one type of cellulose acylate solution may be cast in a single layer, or two or more types of cellulose acylate solutions may be cast simultaneously or sequentially.
As a method of co-casting a plurality of cellulose acylate solutions of two or more layers as described above, for example, a solution containing cellulose acylate from a plurality of casting openings provided at intervals in the traveling direction of the support. A method of casting and laminating each (for example, a method described in JP-A-11-198285) A method of casting a cellulose acylate solution from two casting ports (a method described in JP-A-6-134933) A method of wrapping a flow of a high-viscosity cellulose acylate solution with a low-viscosity cellulose acylate solution and simultaneously extruding the high- and low-viscosity cellulose acylate solution (method described in JP-A-56-162617), etc. Can be mentioned. The present invention is not limited to these.
The manufacturing process of these solvent casting methods is described in detail on pages 22 to 30 of the aforementioned technical number 2001-1745, and includes dissolution, casting (including co-casting), metal support, drying, peeling. Categorized as stretching, etc.

  The film of the present invention preferably has a thickness of 15 to 120 μm, more preferably 30 to 80 μm.

(Polymer film surface treatment)
The polymer film is preferably subjected to a surface treatment. The surface treatment includes corona discharge treatment, glow discharge treatment, flame treatment, acid treatment, alkali treatment and ultraviolet irradiation treatment. Details of these are described in detail on pages 30 to 32 of the aforementioned public technical number 2001-1745. Among these, an alkali saponification treatment is particularly preferable, and it is extremely effective as a surface treatment of cellulose acylate film.
The alkali saponification treatment may be either immersion in a saponification solution or application of a saponification solution, but a coating method is preferred. Examples of the coating method include a dip coating method, a curtain coating method, an extrusion coating method, a bar coating method, and an E-type coating method. Examples of the alkaline saponification treatment liquid include potassium hydroxide solution and sodium hydroxide solution, and the prescribed concentration of hydroxide ions is preferably in the range of 0.1 to 3.0N. Furthermore, as an alkali treatment liquid, a solvent having good wettability with respect to a film (eg, isopropyl alcohol, n-butanol, methanol, ethanol, etc.), a surfactant, a wetting agent (eg, diols, glycerin, etc.) Thus, the wettability of the saponification solution to the transparent support, the saponification solution stability over time, and the like are improved. Specific examples include the contents described in JP 2002-82226 A and WO 02/46809 pamphlet.

  In place of the surface treatment, in addition to the surface treatment, an undercoat layer (described in JP-A-7-333433) or a single resin layer such as gelatin containing both a hydrophobic group and a hydrophilic group is applied. As a first layer, a layer that adheres well to a polymer film (hereinafter abbreviated as an undercoat first layer) is provided, and a hydrophilic resin layer such as gelatin that adheres well to an alignment film as a second layer (hereinafter referred to as an undercoat first layer). And a so-called multilayer method (for example, described in JP-A No. 11-248940).

(Optically anisotropic layer)
Details of preferred embodiments of the optically anisotropic layer made of a liquid crystal compound will be described.
The optically anisotropic layer is preferably designed so as to compensate for the liquid crystal compound in the liquid crystal cell in the black display of the liquid crystal display device. The alignment state of the liquid crystal compound in the liquid crystal cell in black display varies depending on the mode of the liquid crystal display device. The alignment state of the liquid crystal compound in this liquid crystal cell is described in IDW'00, FMC7-2, P411-414.

  It is preferable to provide an alignment film between the polymer substrate surface-treated as described above and the optically anisotropic layer provided thereon.

(Alignment film)
The alignment film has a function of defining the alignment direction of the liquid crystalline molecules. Therefore, the alignment film is indispensable for realizing a preferred embodiment of the present invention. However, if the alignment state is fixed after aligning the liquid crystalline compound, the alignment film plays the role, and thus is not necessarily an essential component of the present invention. That is, it is possible to produce the polarizing plate of the present invention by transferring only the optically anisotropic layer on the alignment film in which the alignment state is fixed onto the polarizer.

  The alignment film is an organic compound (eg, ω-tricosanoic acid) formed by rubbing treatment of an organic compound (preferably polymer), oblique deposition of an inorganic compound, formation of a layer having a microgroove, or Langmuir-Blodgett method (LB film). , Dioctadecylmethylammonium chloride, methyl stearylate). Furthermore, an alignment film in which an alignment function is generated by application of an electric field, application of a magnetic field, or light irradiation is also known.

The alignment film is preferably formed by polymer rubbing treatment. In principle, the polymer used for the alignment film has a molecular structure having a function of aligning liquid crystal molecules.
In the present invention, in addition to the function of aligning liquid crystalline molecules, a cross-linking having a function of aligning a side chain having a crosslinkable functional group (eg, double bond) to the main chain or aligning liquid crystalline molecules. It is preferable to introduce a functional functional group into the side chain.
As the polymer used for the alignment film, either a polymer that can be crosslinked by itself or a polymer that is crosslinked by a crosslinking agent can be used, and a plurality of combinations thereof can be used.

  Examples of the polymer include, for example, methacrylate polymer, styrene polymer, polyolefin, polyvinyl alcohol, modified polyvinyl alcohol, poly (N-methylolacrylamide) described in paragraph No. [0022] of JP-A-8-338913. , Polyester, polyimide, vinyl acetate polymer, carboxymethyl cellulose, polycarbonate and the like. Silane coupling agents can be used as the polymer. Water-soluble polymers (eg, poly (N-methylolacrylamide), carboxymethylcellulose, gelatin, polyvinyl alcohol, modified polyvinyl alcohol) are preferred, gelatin, polyvinyl alcohol and modified polyvinyl alcohol are more preferred, and polyvinyl alcohol and modified polyvinyl alcohol are most preferred. . It is particularly preferable to use two types of polyvinyl alcohol or modified polyvinyl alcohol having different degrees of polymerization.

  The saponification degree of polyvinyl alcohol is preferably 70 to 100%, more preferably 80 to 100%. It is preferable that the polymerization degree of polyvinyl alcohol is 100-5000.

A side chain having a function of aligning liquid crystal molecules generally has a hydrophobic group as a functional group. The specific type of functional group is determined according to the type of liquid crystal molecule and the required alignment state.
For example, the modifying group of the modified polyvinyl alcohol can be introduced by copolymerization modification, chain transfer modification or block polymerization modification. Examples of modifying groups include hydrophilic groups (carboxylic acid groups, sulfonic acid groups, phosphonic acid groups, amino groups, ammonium groups, amide groups, thiol groups, etc.), hydrocarbon groups having 10 to 100 carbon atoms, fluorine atoms Substituted hydrocarbon groups, thioether groups, polymerizable groups (unsaturated polymerizable groups, epoxy groups, azirinidyl groups, etc.), alkoxysilyl groups (trialkoxy, dialkoxy, monoalkoxy) and the like can be mentioned. As specific examples of these modified polyvinyl alcohol compounds, for example, paragraph numbers [0022] to [0145] in JP-A No. 2000-155216 and paragraph numbers [0018] to [0018] in JP-A No. 2002-62426 are described. [0022] and the like.

When a side chain having a crosslinkable functional group is bonded to the main chain of the alignment film polymer, or a crosslinkable functional group is introduced into a side chain having a function of aligning liquid crystalline molecules, the alignment film polymer and the optically anisotropic film The polyfunctional monomer contained in the conductive layer can be copolymerized. As a result, not only between the polyfunctional monomer and the polyfunctional monomer, but also between the alignment film polymer and the alignment film polymer and between the polyfunctional monomer and the alignment film polymer is firmly bonded by a covalent bond. Therefore, the strength of the optical compensation sheet can be remarkably improved by introducing the crosslinkable functional group into the alignment film polymer.
The crosslinkable functional group of the alignment film polymer preferably contains a polymerizable group in the same manner as the polyfunctional monomer. Specific examples include those described in paragraphs [0080] to [0100] in JP-A-2000-155216.

Apart from the crosslinkable functional group, the alignment film polymer can also be crosslinked using a crosslinking agent.
Examples of the crosslinking agent include aldehydes, N-methylol compounds, dioxane derivatives, compounds that act by activating carboxyl groups, active vinyl compounds, active halogen compounds, isoxazole and dialdehyde starch. Two or more kinds of crosslinking agents may be used in combination. Specific examples include compounds described in paragraphs [0023] to [024] in JP-A-2002-62426. Aldehydes having high reaction activity, particularly glutaraldehyde are preferred.

  0.1-20 mass% is preferable with respect to a polymer, and, as for the addition amount of a crosslinking agent, 0.5-15 mass% is more preferable. The amount of the unreacted crosslinking agent remaining in the alignment film is preferably 1.0% by mass or less, and more preferably 0.5% by mass or less. By adjusting in this way, even if the alignment film is used for a long time in a liquid crystal display device or left in a high temperature and high humidity atmosphere for a long time, sufficient durability without reticulation can be obtained.

  The alignment film can be basically formed by applying the polymer on the transparent support containing the alignment film forming material and the crosslinking agent, followed by drying by heating (crosslinking) and rubbing treatment. As described above, the crosslinking reaction may be performed at an arbitrary time after coating on the transparent support. When a water-soluble polymer such as polyvinyl alcohol is used as the alignment film forming material, the coating solution is preferably a mixed solvent of an organic solvent (eg, methanol) having a defoaming action and water. The ratio by mass is water: methanol greater than 0 and 99 or less: less than 100, preferably 1 or more, and more preferably greater than 0 and 91 or less: less than 100, 9 or more. Thereby, generation | occurrence | production of a bubble is suppressed and the defect of the layer surface of an orientation film and also an optically anisotropic layer reduces remarkably.

  The alignment film is preferably applied by spin coating, dip coating, curtain coating, extrusion coating, rod coating, or roll coating. A rod coating method is particularly preferable. The film thickness after drying is preferably 0.1 to 10 μm. Heat drying can be performed at 20 to 110 degrees. In order to form sufficient cross-linking, 60 ° to 100 ° is preferable, and 80 ° to 100 ° is particularly preferable. The drying time can be 1 minute to 36 hours, preferably 1 minute to 30 minutes. The pH is preferably set to an optimum value for the crosslinking agent to be used. When glutaraldehyde is used, the pH is 4.5 to 5.5, and 5 is particularly preferable.

  The alignment film is provided on the transparent support or the undercoat layer. The alignment film can be obtained by rubbing the surface after crosslinking the polymer layer as described above.

  For the rubbing treatment, a treatment method widely adopted as a liquid crystal alignment treatment process of LCD can be applied. That is, a method of obtaining the orientation by rubbing the surface of the orientation film in a certain direction using paper, gauze, felt, rubber, nylon, polyester fiber or the like can be used. In general, it is carried out by rubbing several times using a cloth in which fibers having a uniform length and thickness are flocked on average.

Next, the alignment film functions to align the liquid crystalline molecules of the optically anisotropic layer provided on the alignment film. Thereafter, as necessary, the alignment film polymer and the polyfunctional monomer contained in the optically anisotropic layer are reacted, or the alignment film polymer is crosslinked using a crosslinking agent.
The thickness of the alignment film is preferably in the range of 0.1 to 10 μm.

  The liquid crystalline molecules used in the optically anisotropic layer include rod-like liquid crystalline molecules and discotic liquid crystalline molecules. The rod-like liquid crystal molecules and the discotic liquid crystal molecules may be high-molecular liquid crystals or low-molecular liquid crystals, and further include those in which low-molecular liquid crystals are cross-linked and no longer exhibit liquid crystallinity.

(Bar-shaped liquid crystalline compound)
Examples of rod-like liquid crystalline compounds include azomethines, azoxys, cyanobiphenyls, cyanophenyl esters, benzoic acid esters, cyclohexanecarboxylic acid phenyl esters, cyanophenylcyclohexanes, cyano-substituted phenylpyrimidines, alkoxy-substituted phenylpyrimidines. , Phenyldioxanes, tolanes and alkenylcyclohexylbenzonitriles are preferably used.
The rod-like liquid crystal compound includes a metal complex. Moreover, the liquid crystal polymer which contains a rod-shaped liquid crystalline compound in a repeating unit can also be used as the rod-shaped liquid crystalline compound of the present invention. In other words, the rod-like liquid crystalline compound may be bonded to a (liquid crystal) polymer.
As for rod-like liquid crystalline compounds, for example, Quarterly Chemical Review Vol. 22, Chapter 4 of Liquid Crystal Chemistry (1994), Chapter of Chemical Society of Japan, Chapter 7, Chapter 11 and Liquid Crystal Device Handbook Japan Society for the Promotion of Science, 142nd Committee The one described in Chapter 3 of the edition can be adopted.
The birefringence of the rod-like liquid crystalline compound is preferably in the range of 0.001 to 0.7.

  The rod-like liquid crystalline molecule preferably has a polymerizable group in order to fix its alignment state. The polymerizable group is preferably a radically polymerizable unsaturated group or a cationically polymerizable group. Specifically, for example, the polymerizable groups described in paragraphs [0064] to [0086] of JP-A-2002-62427 are described. Group and a polymerizable liquid crystal compound.

(Discotic liquid crystalline molecules)
Examples of discotic liquid crystalline molecules include C.I. Destrade et al., Mol. Cryst. 71, 111 (1981), benzene derivatives described in C.I. Destrade et al., Mol. Cryst. 122, 141 (1985), Physics lett, A, 78, 82 (1990); Kohne et al., Angew. Chem. 96, page 70 (1984) and the cyclohexane derivatives described in J. Am. M.M. Lehn et al. Chem. Commun. , 1794 (1985), J. Am. Zhang et al., J. Am. Chem. Soc. 116, 2655 (1994), azacrown type and phenylacetylene type macrocycles are included.

  As a discotic liquid crystalline molecule, a compound having liquid crystallinity in which a linear alkyl group, an alkoxy group, and a substituted benzoyloxy group are radially substituted as a side chain of the mother nucleus with respect to the mother nucleus at the center of the molecule Is also included. The molecule or the assembly of molecules is preferably a compound having rotational symmetry and imparting a certain orientation. In the optically anisotropic layer formed from discotic liquid crystalline molecules, the compound finally contained in the optically anisotropic layer does not need to be a discotic liquid crystalline molecule. Also included are compounds having a group that reacts with heat or light and, as a result, polymerized or crosslinked by reaction with heat or light, resulting in a high molecular weight and loss of liquid crystallinity. Preferred examples of the discotic liquid crystalline molecules are described in JP-A-8-50206. Further, the polymerization of discotic liquid crystalline molecules is described in JP-A-8-27284.

  In order to fix the discotic liquid crystalline molecules by polymerization, it is necessary to bond a polymerizable group as a substituent to the discotic core of the discotic liquid crystalline molecules. A compound in which the discotic core and the polymerizable group are bonded via a linking group is preferable, whereby the orientation state can be maintained even in the polymerization reaction. Examples thereof include compounds described in paragraphs [0151] to [0168] of JP-A No. 2000-155216.

  In the hybrid alignment, the angle between the major axis (disc surface) of the discotic liquid crystalline molecule and the plane of the polarizing film increases or decreases in the depth direction of the optically anisotropic layer and as the distance from the plane of the polarizing film increases. doing. The angle preferably decreases with increasing distance. Further, the change in angle can be a continuous increase, a continuous decrease, an intermittent increase, an intermittent decrease, a change including a continuous increase and a continuous decrease, or an intermittent change including an increase and a decrease. The intermittent change includes a region where the inclination angle does not change in the middle of the thickness direction. Even if the angle includes a region where the angle does not change, the angle only needs to increase or decrease as a whole. Furthermore, it is preferable that the angle changes continuously.

  The average direction of the major axis of the discotic liquid crystalline molecules on the polarizing film side can be generally adjusted by selecting the material of the discotic liquid crystalline molecules or the alignment film, or by selecting the rubbing treatment method. Further, the major axis (disk surface) direction of the discotic liquid crystalline molecules on the surface side (air side) is generally adjusted by selecting the type of additive used together with the discotic liquid crystalline molecules or the discotic liquid crystalline molecules. be able to. Examples of the additive used together with the discotic liquid crystalline molecule include a plasticizer, a surfactant, a polymerizable monomer and a polymer. The degree of change in the orientation direction of the major axis can also be adjusted by selecting liquid crystalline molecules and additives as described above.

(Other composition of optically anisotropic layer)
Along with the above liquid crystalline molecules, a plasticizer, a surfactant, a polymerizable monomer, and the like can be used in combination to improve the uniformity of the coating film, the strength of the film, the orientation of the liquid crystalline molecules, and the like. It is preferable that the compound has compatibility with the liquid crystal molecules and can change the tilt angle of the liquid crystal molecules or does not inhibit the alignment.

  Examples of the polymerizable monomer include radically polymerizable or cationically polymerizable compounds. Preferably, it is a polyfunctional radically polymerizable monomer and is preferably copolymerizable with the above-described polymerizable group-containing liquid crystal compound. Examples thereof include those described in paragraph numbers [0018] to [0020] in JP-A No. 2002-296423. The amount of the compound added is generally in the range of 1 to 50% by mass and preferably in the range of 5 to 30% by mass with respect to the discotic liquid crystalline molecules.

  Examples of the surfactant include conventionally known compounds, and fluorine compounds are particularly preferable. Specific examples include compounds described in paragraph numbers [0028] to [0056] in JP-A-2001-330725.

The polymer used together with the discotic liquid crystalline molecules is preferably capable of changing the tilt angle of the discotic liquid crystalline molecules.
A cellulose ester can be mentioned as an example of a polymer. Preferable examples of the cellulose ester include those described in paragraph [0178] of JP-A No. 2000-155216. The addition amount of the polymer is preferably in the range of 0.1 to 10% by mass, and preferably in the range of 0.1 to 8% by mass with respect to the liquid crystal molecule so as not to inhibit the alignment of the liquid crystal molecules. It is more preferable.
The discotic nematic liquid crystal phase-solid phase transition temperature of the discotic liquid crystalline molecules is preferably 70 to 300 degrees, and more preferably 70 to 170 degrees.

(Formation of optically anisotropic layer)
The optically anisotropic layer can be formed by applying a coating liquid containing liquid crystalline molecules and, if necessary, a polymerization initiator described later and optional components on the alignment film.

As the solvent used for preparing the coating solution, an organic solvent is preferably used. Examples of organic solvents include amides (eg, N, N-dimethylformamide), sulfoxides (eg, dimethyl sulfoxide), heterocyclic compounds (eg, pyridine), hydrocarbons (eg, benzene, hexane), alkyl halides (eg, , Chloroform, dichloromethane, tetrachloroethane), esters (eg, methyl acetate, butyl acetate), ketones (eg, acetone, methyl ethyl ketone), ethers (eg, tetrahydrofuran, 1,2-dimethoxyethane). Alkyl halides and ketones are preferred. Two or more organic solvents may be used in combination.
The coating liquid can be applied by a known method (eg, wire bar coating method, extrusion coating method, direct gravure coating method, reverse gravure coating method, die coating method).
The thickness of the optically anisotropic layer is preferably 0.1 to 20 μm, more preferably 0.5 to 15 μm, and most preferably 1 to 10 μm.

(Fixing the alignment state of liquid crystalline molecules)
The aligned liquid crystal molecules can be fixed while maintaining the alignment state. The immobilization is preferably performed by a polymerization reaction. The polymerization reaction includes a thermal polymerization reaction using a thermal polymerization initiator and a photopolymerization reaction using a photopolymerization initiator. A photopolymerization reaction is preferred.
Examples of the photopolymerization initiator include α-carbonyl compounds (described in US Pat. Nos. 2,367,661 and 2,367,670), acyloin ether (described in US Pat. No. 2,448,828), α-hydrocarbon substituted aromatic acyloin. Compound (described in US Pat. No. 2,722,512), polynuclear quinone compound (described in US Pat. Nos. 3,046,127 and 2,951,758), a combination of triarylimidazole dimer and p-aminophenyl ketone (US Pat. No. 3,549,367) Description), acridine and phenazine compounds (JP-A-60-105667, U.S. Pat. No. 4,239,850) and oxadiazole compounds (U.S. Pat. No. 4,212,970).
The amount of the photopolymerization initiator used is preferably in the range of 0.01 to 20% by mass, more preferably in the range of 0.5 to 5% by mass, based on the solid content of the coating solution.
It is preferable to use ultraviolet rays for light irradiation for polymerization of liquid crystalline molecules.
The irradiation energy is preferably in the range of ^{20mJ / cm 2 ~50J / cm 2} , more preferably in the range of 20~5000mJ / cm ^2, more preferably in the range of 100 to 800 mJ / cm ² . In order to accelerate the photopolymerization reaction, light irradiation may be performed under heating conditions.
A protective layer may be provided on the optically anisotropic layer.

(Polarizing film)
The optical film of the present invention exhibits its function remarkably by being bonded to a polarizing plate or used as a protective film for a polarizing plate.

  The optically anisotropic layer (when providing a plurality of optically anisotropic layers, the first optically anisotropic layer closest to the polarizing film) is formed from liquid crystalline molecules directly on the polarizing film or via an alignment film. The liquid crystal molecules are preferably used. Specifically, the optically anisotropic layer is formed by applying the coating liquid for the optically anisotropic layer as described above to the surface of the polarizing film. As a result, without using a polymer film between the polarizing film and the optically anisotropic layer, a thin polarizing plate having a small stress (strain × cross-sectional area × elastic modulus) associated with the dimensional change of the polarizing film is produced. . When the polarizing plate according to the present invention is attached to a large liquid crystal display device, an image with high display quality is displayed without causing problems such as light leakage.

The polarizing film is manufactured by Optiva Inc. And a polarizing film comprising a binder and iodine or a dichroic dye is preferable.
Iodine and dichroic dye in the polarizing film exhibit deflection performance by being oriented in the binder. It is preferable that the iodine and the dichroic dye are aligned along the binder molecule, or the dichroic dye is aligned in one direction by self-assembly such as liquid crystal.
For example, currently available polarizers are made by immersing a stretched polymer in a solution of iodine or dichroic dye in a bath and allowing iodine or dichroic dye to penetrate into the binder. It is common to be done.
The commercially available polarizing film has iodine or dichroic dye distributed about 4 μm (about 8 μm on both sides) from the polymer surface, and a thickness of at least 10 μm is necessary to obtain sufficient polarizing performance. The penetrability can be controlled by the solution concentration of iodine or dichroic dye, the temperature of the bath, and the immersion time.
As described above, the lower limit of the binder thickness is preferably 10 μm. The upper limit of the thickness is preferably as thin as possible from the viewpoint of light leakage of the liquid crystal display device. Preferably it is 30 micrometers or less, More preferably, it is 25 micrometers or less, More preferably, it is 20 micrometers or less. In particular, when the thickness is 20 μm or less, the light leakage phenomenon is not particularly observed in a 17-inch liquid crystal display device, which is extremely preferable.

The binder of the polarizing film may be cross-linked. As the crosslinked binder, a polymer that can be crosslinked per se can be used. It is also possible to form a polarizing film by reacting a polymer having a functional group or a binder obtained by introducing a functional group into a polymer between the binders by light, heat, or pH change.
Moreover, you may introduce | transduce a crosslinked structure into a polymer with a crosslinking agent.
Crosslinking is generally carried out by applying a coating liquid containing a polymer or a mixture of a polymer and a crosslinking agent on a transparent support and then heating. Since it is only necessary to ensure durability at the stage of the final product, the crosslinking treatment may be performed at any stage until the final polarizing plate is obtained.

As the binder of the polarizing film, either a polymer that can be crosslinked per se or a polymer that is crosslinked by a crosslinking agent can be used. Examples of the polymer include the same polymers as those described for the alignment film. Among these, polyvinyl alcohol and modified polyvinyl alcohol are most preferable.
The modified polyvinyl alcohol is described in, for example, JP-A-8-338913, JP-A-9-152509, and JP-A-9-316127.
Two or more kinds of polyvinyl alcohol and modified polyvinyl alcohol may be used in combination.

The addition amount of the crosslinking agent in the binder is preferably 0.1 to 20% by mass with respect to the binder. The orientation of the polarizing element and the heat and humidity resistance of the polarizing film become better.
The alignment film contains a certain amount of a crosslinking agent that has not reacted even after the crosslinking reaction has been completed. However, the amount of the remaining crosslinking agent is preferably 1.0% by mass or less and more preferably 0.5% by mass or less in the alignment film. In this way, even if the polarizing film is incorporated in a liquid crystal display device and used for a long time or left in a high temperature and high humidity atmosphere for a long time, the degree of polarization does not decrease.
The crosslinking agent is described in, for example, US Reissue Patent 23297. Boron compounds (eg, boric acid, borax) can also be used as a crosslinking agent.

As the dichroic dye, an azo dye, stilbene dye, pyrazolone dye, triphenylmethane dye, quinoline dye, oxazine dye, thiazine dye or anthraquinone dye is used. The dichroic dye is preferably water-soluble. The dichroic dye preferably has a hydrophilic substituent (eg, sulfo, amino, hydroxyl).
As an example of a dichroic dye, the compound as described in an invention association open technique, a public technical number 2001-1745, page 58 (issue date March 15, 2001) is mentioned, for example.

  In order to increase the contrast ratio of the liquid crystal display device, the transmittance of the polarizing plate is preferably higher and the degree of polarization is preferably higher. The transmittance of the polarizing plate is preferably in the range of 30 to 50%, more preferably in the range of 35 to 50%, and most preferably in the range of 40 to 50% in light having a wavelength of 550 nm. . The degree of polarization is preferably in the range of 90 to 100%, more preferably in the range of 95 to 100%, and most preferably in the range of 99 to 100% in light having a wavelength of 550 nm.

  It is also possible to dispose the polarizing film and the optically anisotropic layer, or the polarizing film and the alignment film via an adhesive. As the adhesive, a polyvinyl alcohol resin (including a modified polyvinyl alcohol with an acetoacetyl group, a sulfonic acid group, a carboxyl group, or an oxyalkylene group) or an aqueous boron compound solution can be used. A polyvinyl alcohol resin is preferred. The thickness of the adhesive layer is preferably in the range of 0.01 to 10 μm after drying, and particularly preferably in the range of 0.05 to 5 μm.

(Manufacture of polarizing plates)
From the viewpoint of yield, the polarizing film is stretched at an angle of 10 to 80 degrees with respect to the longitudinal direction (MD direction) of the polarizing film (stretching method) or rubbed (rubbing method). It is preferable to dye with a dichroic dye. The tilt angle is preferably stretched so as to match the angle formed between the transmission axis of the two polarizing plates bonded to both sides of the liquid crystal cell constituting the LCD and the vertical or horizontal direction of the liquid crystal cell.
A normal inclination angle is 45 degrees. Recently, however, devices that are not necessarily 45 degrees have been developed for transmissive, reflective, and transflective LCDs, and it is preferable that the stretching direction can be arbitrarily adjusted in accordance with the design of the LCD.

In the stretching method, the stretching ratio is preferably 2.5 to 30.0 times, and more preferably 3.0 to 10.0 times. Stretching can be performed by dry stretching in air. Moreover, you may implement wet extending | stretching in the state immersed in water. The stretch ratio of dry stretching is preferably 2.5 to 5.0 times, and the stretch ratio of wet stretching is preferably 3.0 to 10.0 times. The stretching step may be performed in several steps including oblique stretching. By dividing into several times, it is possible to stretch more uniformly even at high magnification. Before the oblique stretching, a slight stretching (a degree to prevent shrinkage in the width direction) may be performed horizontally or vertically.
Stretching can be performed by performing tenter stretching in biaxial stretching in different steps. The biaxial stretching is the same as the stretching method performed in normal film formation. In biaxial stretching, stretching is performed at different speeds on the left and right, so that the thickness of the binder film before stretching needs to be different on the left and right. In casting film formation, the flow rate of the binder solution can be differentiated between the left and right sides by tapering the die.
As described above, a binder film that is obliquely stretched by 10 to 80 degrees with respect to the MD direction of the polarizing film is produced.

In the rubbing method, a rubbing treatment method widely adopted as a liquid crystal alignment treatment process of LCD can be applied. That is, orientation is obtained by rubbing the surface of the film in a certain direction using paper, gauze, felt, rubber, nylon, or polyester fiber. Generally, it is carried out by rubbing several times using a cloth in which fibers having a uniform length and thickness are planted on average.
It is preferable to carry out using a rubbing roll in which the roundness, cylindricity, and deflection (eccentricity) of the roll itself are all 30 μm or less. The wrap angle of the film on the rubbing roll is preferably 0.1 to 90 degrees. However, as described in JP-A-8-160430, a stable rubbing treatment can be obtained by winding 360 degrees or more.
When rubbing a long film, it is preferable to transport the film at a speed of 1 to 100 m / min with a constant tension by a transport device. The rubbing roll is preferably rotatable in the horizontal direction with respect to the film traveling direction for setting an arbitrary rubbing angle. It is preferable to select an appropriate rubbing angle in the range of 0 to 60 degrees. When used in a liquid crystal display device, 40 to 50 degrees is preferable. 45 degrees is particularly preferable.

A polymer film is preferably disposed on the surface of the polarizing film opposite to the optically anisotropic layer (arrangement of optically anisotropic layer / polarizing film / polymer film).
The polymer film is preferably provided with an antireflection film having an outermost surface having antifouling properties and scratch resistance. Any conventionally known antireflection film can be used.

(Liquid crystal display device)
A preferred form of the optically anisotropic layer in each liquid crystal mode will be described below.

(TN mode liquid crystal display)
The TN mode liquid crystal cell is most frequently used as a color TFT liquid crystal display device, and is described in many documents. The alignment state in the liquid crystal cell in the TN mode black display is an alignment state in which the rod-like liquid crystal molecules rise at the center of the cell and the rod-like liquid crystal molecules lie near the cell substrate.
(OCB mode liquid crystal display device)
The OCB mode liquid crystal cell is a bend alignment mode liquid crystal cell in which rod-like liquid crystalline molecules are aligned in a substantially opposite direction (symmetrically) between the upper part and the lower part of the liquid crystal cell. Liquid crystal display devices using a bend alignment mode liquid crystal cell are disclosed in US Pat. Nos. 4,583,825 and 5,410,422. Since the rod-like liquid crystal molecules are symmetrically aligned at the upper and lower portions of the liquid crystal cell, the bend alignment mode liquid crystal cell has a self-optical compensation function. For this reason, this liquid crystal mode is also called an OCB (Optically Compensatory Bend) liquid crystal mode.
Similarly to the TN mode, the liquid crystal cell in the OCB mode is in a black display, and the alignment state in the liquid crystal cell is an alignment state in which the rod-like liquid crystal molecules rise at the center of the cell and the rod-like liquid crystal molecules lie in the vicinity of the cell substrate. .

(VA mode liquid crystal display device)
In a VA mode liquid crystal cell, rod-like liquid crystal molecules are aligned substantially vertically when no voltage is applied.
The VA mode liquid crystal cell includes (1) a narrowly defined VA mode liquid crystal cell in which rod-like liquid crystalline molecules are aligned substantially vertically when no voltage is applied, and substantially horizontally when a voltage is applied (Japanese Patent Laid-Open No. Hei 2-). 176625) (2) Liquid crystal cell (SID97, Digest of tech. Papers (Preliminary Proceed) 28 (1997) 845 in which the VA mode is converted into a multi-domain (MVA mode) for widening the viewing angle. ), (3) A liquid crystal cell in a mode (n-ASM mode) in which rod-like liquid crystalline molecules are substantially vertically aligned when no voltage is applied and twisted multi-domain alignment is applied when a voltage is applied (Preliminary collections 58-59 of the Japan Liquid Crystal Society) (1998)) and (4) SURVAVAL mode liquid crystal cells (announced at LCD International 98).

(Other liquid crystal display devices)
The ECB mode and STN mode liquid crystal display devices can be optically compensated in the same way as described above.

  The present invention will be described more specifically with reference to the following examples. The materials, reagents, ratios, operations and the like shown in the following examples can be appropriately changed without departing from the spirit of the present invention. Therefore, the scope of the present invention is not limited to the specific examples shown below.

[Example 1]
(Production of polymer substrate)
The following composition was put into a mixing tank and stirred while heating to dissolve each component to prepare a cellulose acetate solution.

(Cellulose acetate solution composition)
Cellulose acetate (linter) with an acetylation degree of 60.9% 80 parts by mass Cellulose acetate (linter) with an acetylation degree of 60.8% 20 parts by mass Triphenyl phosphate (plasticizer) 7.8 parts by mass Biphenyl diphenyl phosphate (plasticizer) 3.9 parts by mass Methylene chloride (first solvent) 300 parts by mass Methanol (second solvent) 54 parts by mass 1-butanol (third solvent) 11 parts by mass

Into the mixing tank, 16 parts by mass of the following retardation increasing agent, 80 parts by mass of methylene chloride and 20 parts by mass of methanol were added and stirred while heating to prepare a retardation increasing agent solution.
A dope was prepared by mixing 474 parts by mass of the cellulose acetate solution composition with 25 parts by mass of the retardation increasing agent solution and stirring sufficiently. The addition amount of the retardation increasing agent was 3.5 parts by mass with respect to 100 parts by mass of cellulose acetate.

The obtained dope was cast using a band casting machine. After the film surface temperature on the band reached 40 ° C., the film was dried for 1 minute, peeled off, and then the polymer substrate (PK-1) having a residual solvent amount of 0.3% by mass with 140 ° drying air Manufactured.
The obtained polymer substrate (PK-1) had a width of 1500 mm and a thickness of 65 μm. It was 4 nm when the retardation value (Re) in wavelength 590nm was measured using the ellipsometer (M-150, JASCO Corporation make). Moreover, it was 78 nm when the retardation value (Rth) in wavelength 590nm was measured.

(Production of optical compensation sheet with optically anisotropic layer)
The polymer substrate (PK-1) was immersed in a 2.0N potassium hydroxide solution (25 degrees) for 2 minutes, neutralized with sulfuric acid, washed with pure water, and dried. The surface energy of PK-2 was determined by a contact angle method and found to be 63 mN / m.
<Formation of alignment film>
On the produced PK-1, a coating solution having the following composition was applied at a coating amount of 28 ml / m ² with a # 16 wire bar coater. Drying was performed with warm air of 60 degrees for 60 seconds and further with warm air of 90 degrees for 150 seconds.

<Alignment film coating solution composition>
The following modified polyvinyl alcohol 10 parts by weight Water 371 parts by weight Methanol 119 parts by weight Glutaraldehyde (crosslinking agent) 0.5 parts by weight Next, the slow axis of the polymer substrate (PK-1) (measured at a wavelength of 632.8 nm) The alignment film was rubbed in the parallel direction.

＜光学異方性層の形成＞
（光学異方性層組成物）
下記のディスコティック液晶性化合物 ４１．０１ Ｋｇ
エチレンオキサイド変成トリメチロールプロパントリアクリレート
（Ｖ＃３６０、大阪有機化学（株）製） ４．０６ Ｋｇ
一般式（Ｉ）の例示化合物（Ｉ−１） ０．０３２Ｋｇ
一般式（II）の例示化合物（II−２） ０．０４８Ｋｇ
フルオロ脂肪族基含有重合体例示化合物（Ｐ−７０） ０．１６ Ｋｇ
１，３，５―トリアジン環基を有する例示化合物（Ｈ−６）０．０８ Ｋｇ
光重合開始剤（イルガキュアー９０７、チバガイギー社製）１．３５ Ｋｇ
増感剤（カヤキュアーＤＥＴＸ、日本化薬（株）製） ０．４５ Ｋｇ
配向膜上に、上記光学異方性層組成物を、１０２Ｋｇのメチルエチルケトンに溶解して塗布液とし、これを、＃３．４のワイヤーバーで塗布した。これを１２０度の恒温ゾーンで１分間加熱し、ディスコティック液晶性化合物を配向させた。次に、６０度の雰囲気下で１２０Ｗ／ｃｍの高圧水銀灯を用いて、１分間ＵＶ照射し、ディスコティック液晶性化合物を重合させた。その後、室温まで放冷した。このようにして、光学異方性層を形成し、光学補償シート（ＫＨ−１）を作製した。
波長５４６ｎｍで測定した光学異方性層のＲｅレターデーション値は４０ｎｍであった。
偏光板をクロスニコル配置とし、得られた光学補償シートのムラを観察したところ、正面、及び法線から６０度まで傾けた方向から見ても、ムラは検出出来なかった。

<Formation of optically anisotropic layer>
(Optically anisotropic layer composition)
The following discotic liquid crystalline compounds 41.01 Kg
Ethylene oxide modified trimethylolpropane triacrylate (V # 360, manufactured by Osaka Organic Chemical Co., Ltd.) 4.06 Kg
Exemplary compound (I-1) of general formula (I) 0.032 kg
Example compound (II-2) of general formula (II) 0.048 kg
Fluoroaliphatic group-containing polymer exemplified compound (P-70) 0.16 Kg
Illustrative compound having 1,3,5-triazine ring group (H-6) 0.08 Kg
Photopolymerization initiator (Irgacure 907, manufactured by Ciba Geigy) 1.35 Kg
Sensitizer (Kayacure DETX, manufactured by Nippon Kayaku Co., Ltd.) 0.45 Kg
On the alignment film, the optically anisotropic layer composition was dissolved in 102 kg of methyl ethyl ketone to form a coating solution, which was coated with a # 3.4 wire bar. This was heated for 1 minute in a 120 degree constant temperature zone, and the discotic liquid crystalline compound was orientated. Next, UV irradiation was performed for 1 minute using a 120 W / cm high pressure mercury lamp in a 60 degree atmosphere, and the discotic liquid crystalline compound was polymerized. Then, it stood to cool to room temperature. Thus, an optically anisotropic layer was formed, and an optical compensation sheet (KH-1) was produced.
The Re retardation value of the optically anisotropic layer measured at a wavelength of 546 nm was 40 nm.
When the polarizing plate was arranged in a crossed Nicol arrangement and the unevenness of the obtained optical compensation sheet was observed, the unevenness could not be detected even when viewed from the front and the direction inclined by 60 degrees from the normal line.

Discotic liquid crystalline compounds

(Preparation of polarizing plate)
Using a polyvinyl alcohol-based adhesive, KH-1 (optical compensation sheet) was attached to one side of the polarizer (HF-1). Moreover, the saponification process was performed to the 80-micrometer-thick triacetyl-cellulose film (TD-80U: Fuji Photo Film Co., Ltd. product), and it affixed on the other side of the polarizer using the polyvinyl alcohol-type adhesive agent.
The transmission axis of the polarizer and the slow axis of PK-2 were arranged in parallel. The transmission axis of the polarizer and the slow axis of the triacetyl cellulose film were arranged so as to be orthogonal to each other. In this way, a polarizing plate (HB-1) was produced.

[Example 2]
An optical compensation sheet was prepared in the same manner as in Example 1 except that the exemplified compound (H-6) used in Example 1 was not added and the method of heating and aging the optically anisotropic layer was changed as shown in Table 1. .
[Examples 3 to 5]
An optical compensation sheet was produced in the same manner as in Example 1 except that the exemplified compounds (No. I-1) and (No. II-2) used in Example 1 were changed as shown in Table 1.
[Comparative Examples 1-4]
An optical compensation sheet was prepared in the same manner as in Example 1 except that the addition of the exemplified compounds used in Example 1 was changed as shown in Table 1.
Here, Compound A employed in Comparative Example 2 is as follows.

(Evaluation with TN liquid crystal cell)
A pair of polarizing plates provided in a liquid crystal display device (AQUAS LC20C1S, manufactured by Sharp Corporation) using a TN type liquid crystal cell is peeled off, and the polarizing plate (HB-1) prepared in Example 1 is optically replaced. The compensation sheets (KH-1) were attached to the observer side and the backlight side one by one through an adhesive so that the compensation sheet (KH-1) was on the liquid crystal cell side. The transmission axis of the polarizing plate on the observer side and the transmission axis of the polarizing plate on the backlight side were arranged so as to be in the O mode.
About the produced liquid crystal display device, the viewing angle was measured in eight steps from black display (L1) to white display (L8) using the measuring machine (EZ-Contrast160D, ELDIM company make). The measurement results are shown in Table 1.

[Comparative Examples 5 to 9]
An optical compensation sheet was prepared in the same manner as in Example 1 except that the addition of the exemplified compounds used in Example 1 was changed as shown in Table 1.

(Evaluation of unevenness on LCD panel)
The display panels of the liquid crystal display devices of Examples 1 to 5 and Comparative Examples 1 to 9 were adjusted to the whole halftone, and the unevenness was evaluated. The results are shown in Table 1.

(Inclination angle evaluation of liquid crystal compound part)
The tilt angle in the vicinity of the alignment film of the liquid crystalline compound and the tilt angle in the vicinity of the air interface in the optically anisotropic layer of the optical compensation sheet are changed by using an ellipsometer (APE-100, manufactured by Shimadzu Corporation). The retardation was measured, hypothesized as a refractive index ellipsoid model, and calculated by the method described in Designing Concepts of the Disco Negative Birefringence Compensation Films, SID98 DIGEST. The measurement wavelength is 632.8 nm, and the results are shown in Table 1.

  Fluorine-containing compound (A) used in Comparative Example 2: The compound (FS-73) described in JP-A No. 2001-330725 was employed.

  As can be seen from the results of Examples 1 to 5 and Comparative Examples 1 to 9 shown in Table 1, optical compensation having an optically anisotropic layer not containing the compounds represented by the general formulas (I) and (II) In the sheet (Comparative Examples 1 and 2), since the tilt angle at the air interface of the liquid crystal compound is too low, the viewing angle of the liquid crystal display device is not sufficiently expanded. In the optical compensation sheet (Comparative Examples 3 to 9) having an optically anisotropic layer containing only one of the compounds represented by the general formulas (I) and (II) according to the present invention, the liquid crystalline compound Since the inclination angle at the air interface is too low or too high, the viewing angle is not sufficiently enlarged.

Claims (9)

It comprises at least a support and an optically anisotropic layer provided on the support, and the optically anisotropic layer comprises at least two kinds of compounds selected from compounds represented by the following general formula (I) An optical compensation sheet comprising a different compound and a liquid crystal compound.
Formula (I)
(Rf-X-) _m Ar (-W) _n
(In the formula (I), Ar represents an aromatic heterocycle or an aromatic hydrocarbon ring, X represents a single bond or a divalent linking group, and Rf is an alkyl group partially or entirely substituted with a fluorine atom. W represents a sulfo group or a carboxyl group, m represents 1 to 4, and n represents 1 or 2. 2. The optical compensation according to claim 1, wherein one of two different compounds selected from the compound represented by the general formula (I) is a compound represented by the following general formula (II): Sheet.
Formula (II)
(Rf ¹ -X ^1- ) ₂ Ar ¹ (-W ¹ ) _n1
(In the formula (II), Ar ¹ represents an aromatic heterocycle or an aromatic hydrocarbon ring, X ¹ represents a single bond or a divalent linking group, and Rf ¹ is partially or entirely substituted with a fluorine atom. And W ¹ represents a sulfo group or a carboxyl group, and n1 represents 1 or 2.) The optical compensation sheet according to claim 1, wherein the optically anisotropic layer contains a fluoroaliphatic group-containing polymer. The optical compensation sheet according to any one of claims 1 to 3, wherein the optically anisotropic layer contains a compound having a 1,3,5-triazine ring group. The optical compensation sheet according to claim 1, wherein the liquid crystal compound is a discotic liquid crystal compound. The optical compensation sheet according to any one of claims 1 to 5, wherein the optically anisotropic layer includes a liquid crystal compound with hybrid alignment, and the liquid crystal compound with hybrid alignment is fixed. The optical compensation sheet according to claim 1, further comprising an alignment film on the support. A liquid crystal display device comprising the optical compensation sheet according to claim 1. The optically anisotropic layer comprises at least a support and an optically anisotropic layer provided on the support, and the optically anisotropic layer has at least the general formula (I)
(Rf-X-) _m Ar (-W) _n
(In the formula (I), Ar represents an aromatic heterocycle or an aromatic hydrocarbon ring, X represents a single bond or a divalent linking group, and Rf is an alkyl group partially or entirely substituted with a fluorine atom. W represents a sulfo group or a carboxyl group, m represents 1 to 4, and n represents 1 or 2.) From two different compounds selected from the compounds represented by: A method for producing an optical compensation sheet, comprising at least a step of horizontally aligning the liquid crystalline compound on the support, a step of hybrid aligning the horizontally aligned liquid crystalline compound, and the liquid crystal having the hybrid alignment A method for producing an optical compensation sheet, comprising the step of fixing a functional compound.