JP2006053391A - Optical compensation sheet, its manufacturing method, and polarizing plate and liquid crystal display device using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical compensation sheet and its manufacturing method capable of extending the viewing angle of an image display device without lowering display quality caused by irregularity or the like, and to provide a polarizing plate and a liquid crystal display device using the optical compensation sheet. <P>SOLUTION: The optical compensation sheet has an optical anisotropic layer formed by applying composition containing at least a kind of liquid crystalline compound, and at least a kind of compound shown by a general expression(1): (Rf-X-)<SB>m</SB>Ar(-W)<SB>n</SB>(Ar expresses an(m+n)-valent aromatic heterocyclic group or an aromatic hydrocarbon ring group, X expresses a single bond or bivalent coupling group, Rf expresses an alkyl group or an alkyl group substituted by fluorine atoms, W expresses a sulfo group or a carboxyl group, m expresses an integer 1 to 4 and n expresses 1 or 2) by a die coater. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention belongs to the technical field of a novel optical compensation sheet and a method for producing the same, and a polarizing plate and a liquid crystal display device using the same. The present invention also belongs to the technical field of a method for controlling the tilt angle at the air interface of liquid crystals, particularly discotic liquid crystalline compounds.

  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, but in recent years, an optical compensation sheet having an optically anisotropic layer made of a discotic liquid crystalline compound on a transparent support instead of a stretched birefringent film. It has been 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 conventional stretched birefringent films. On the other hand, the discotic liquid crystalline compound has a variety of alignment forms, and therefore, a technique for controlling the orientation of the discotic liquid crystalline compound in the optically anisotropic layer is necessary to develop desired optical characteristics. It is. 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 with the distance from the support surface. It is the most important factor that determines the performance of the 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 performed between the tilt angle of the surface of the alignment film provided on the support for the purpose of regulating the orientation angle of the discotic liquid crystal compound and the tilt angle of the air-side interface that is the outermost surface of the optical compensation sheet. It is realized using the difference. 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. 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 its inclination angle is close to 0 ° (Patent Document 1).

  On the other hand, in order to obtain a desired optical compensation function, it is necessary to increase the inclination angle on the air interface side. As a method for obtaining an angle exceeding 50 ° which is an inclination angle obtained at a normal air interface, a method of adding a partially esterified cellulose has been proposed (Patent Document 2). 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 was not sufficiently expanded, that is, not theoretically expected. It turns out that there are also things. One reason for the insufficient optical compensation function is that the tilt angle of the discotic liquid crystalline compound is not sufficiently controlled.

  Conventionally, a coating method using a wire bar has been mainly used when forming an optically anisotropic layer. However, in the coating method using a wire bar, stepped unevenness is likely to occur due to vibration of the coating liquid in the liquid receiving tank or roll eccentricity and deflection related to coating. Further, since these coating methods are post-measuring methods, it is relatively difficult to ensure a stable film thickness. Therefore, in these coating methods, it is difficult to increase the coating speed beyond a certain speed, and the high productivity inherent in coating cannot be fully utilized. Furthermore, in recent years, there has been an increasing demand for a coating technique capable of stably forming an optically anisotropic layer having a thinner film thickness (for example, 20 μm or less) than that in the past in order to produce a higher-performance optical compensation sheet. . As a high-precision thin layer coating technique, a technique for sharpening the tip lip of the slot die has been proposed (Patent Document 3).

JP-A-8-50206 JP-A-8-95030 Japanese National Publication No. 9-511682

  The present invention provides a novel optical compensation sheet that has an excellent optical compensation function and contributes to an increase in viewing angle when applied to an image display device, particularly a liquid crystal display device such as a TN mode, an OCB mode, and an IPS mode. This is the issue. Another object of the present invention is to provide an optical compensation sheet that contributes to an increase in the viewing angle of an image display device without causing deterioration in display quality due to unevenness or the like. Further, the present invention provides a method capable of stably and quickly producing an optical compensation sheet having an optically anisotropic layer composed of liquid crystal molecules hybrid-aligned with a sufficient tilt angle (especially the tilt angle on the air interface side). The issue is to provide. In addition, the present invention can stably and quickly provide a novel optical compensation sheet that contributes to an increase in viewing angle when applied to an image display device, particularly a liquid crystal display device such as a TN mode, an OCB mode, or an IPS mode. It is an object to provide a method that can be manufactured.

[1] Optical compensation having an optically anisotropic layer formed by coating a composition containing at least one liquid crystalline compound and at least one compound represented by the following general formula (1) with a die coater Sheet:
General formula (1)
(Rf-X-) _m Ar (-W) _n
In formula (1), Ar represents an (m + n) -valent aromatic heterocyclic group or aromatic hydrocarbon ring group, X represents a single bond or a divalent linking group, and Rf is substituted with an alkyl group or a fluorine atom. W represents a sulfo group or a carboxyl group, m represents an integer of 1 to 4, and n represents 1 or 2. When m represents an integer of 2 or more, a plurality of Rf and X may be the same or different.
[2] The optical compensation sheet according to [1], wherein the composition further contains at least one fluoroaliphatic group-containing polymer.
[3] The optical compensation sheet according to [1] or [2], wherein the composition further contains at least one compound having a 1,3,5-triazine ring group.
[4] The optical compensation sheet according to any one of [1] to [3], wherein the composition further contains at least one cellulose ester.
[5] The optical compensation sheet according to any one of [1] to [4], wherein the liquid crystalline compound is a discotic liquid crystalline compound.
[6] The optical compensation sheet according to any one of [1] to [5], wherein in the optically anisotropic layer, molecules of the liquid crystalline compound are hybrid-aligned and the hybrid alignment is fixed.
[7] The optical compensation sheet according to any one of [1] to [6], wherein the cellulose ester is cellulose acetate butyrate.

[8] A composition containing at least one liquid crystal compound and at least one compound represented by the general formula (1) described in [1] is applied by a die coater, and A step of horizontally aligning the molecules in the presence of the compound represented by the general formula (1);
Hybrid aligning molecules of the horizontally aligned liquid crystalline compound;
And a step of fixing the liquid crystalline compound in the hybrid alignment state to form an optically anisotropic layer.
[9] The production method according to [8], wherein the coating film formed by applying a coating solution on the transparent support is applied such that the wet film thickness is 20 μm or less.

[10] A liquid crystal display device having the optical compensation sheet according to any one of [1] to [7].
[11] A liquid crystal cell and a pair of polarizing films respectively disposed on both sides of the liquid crystal cell, and any one of [1] to [7] between at least one of the pair of polarizing films and the liquid crystal cell [11] The liquid crystal display device having the optical compensation sheet.
[12] A polarizing plate having at least a polarizing film and a transparent protective film provided on one surface of the polarizing film, wherein the transparent protective film is the optical compensation sheet of any one of [1] to [7] .

  In the present invention, the composition containing the compound represented by the general formula (1) together with the liquid crystalline compound is coated with a die coater to form an optically anisotropic layer, thereby providing an excellent optical compensation function. In addition, an optical compensation sheet having a wide viewing angle expansion performance when applied to an image display device is provided. The optical compensation sheet of the present invention can contribute to the expansion of the viewing angle of the image display device without causing image display unevenness due to coating unevenness during the formation of the optically anisotropic layer and without impairing display quality. In addition, according to the method of the present invention, the liquid crystal molecules can be hybrid-aligned with a sufficient tilt angle (especially the tilt angle on the air interface side), and further by using a die coater, a thin film optical anisotropy can be obtained. The conductive layer can be formed stably and rapidly. As a result, an optical compensation sheet that can be applied to various display modes, particularly TN mode, OCB mode, IPS mode, and other liquid crystal display devices can be stably and quickly manufactured.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the present invention will be described in detail.
The optical compensation sheet of the present invention is an optically anisotropic sheet formed by coating a composition containing at least one liquid crystalline compound and at least one compound represented by the general formula (1) described later with a die coater. It has a sex layer. First, a coating method using a die coater will be described. The die coater is, for example, a coating liquid supply means comprising a tank for storing a coating liquid and the like, a pump for supplying a predetermined amount of the coating liquid from the tank to the die, and the supplied coating liquid as a bead continuously. And a die for feeding to a film or the like conveyed to the surface. The coating method using a die coater is a so-called pre-measuring method in which the supply amount of the coating liquid can be made constant by controlling the number of rotations of the pump in the supply unit. As a result, it is possible to stably form an optically anisotropic layer having a uniform film thickness. In addition, even when the speed is increased, stepped unevenness due to coating unevenness hardly occurs, and the productivity of the optical compensation sheet can be improved.

  As the die coater used in the present invention, a slot die is preferably used. By using a slot die, an optically anisotropic layer having a uniform thickness can be formed more stably. FIG. 1 shows a schematic diagram of an example of a slot die coater that can be used in the present invention. The coater 10 supplies the coating liquid 14 as a bead 14a from the slot die 13 to the surface of a web (for example, a transparent film) 12 that is supported by the backup roll 11 and continuously runs, and the coating film 14b is applied to the surface of the web 12. Form.

  The slot die 13 has a pocket 15 and a slot 16 formed therein. The pocket 15 has a curved cross section and a straight line. For example, a substantially circular shape as shown in FIG. 1 or a semicircular shape may be used. The pocket 15 is a space extended with the same cross-sectional shape in the width direction of the slot die 13 (in FIG. 1, the direction perpendicular to the paper surface, the same applies hereinafter), and is used to store the coating liquid. Used. The effective length of the extension in the width direction is generally equal to or slightly longer than the coating width (for example, the width of the transparent film). The application liquid 14 is supplied to the pocket 15 from the side surface of the slot die 13 or from the center of the surface opposite to the slot, for example, by a supply pump (not shown) capable of controlling the supply amount. The pocket 15 may be provided with a stopper for preventing the coating liquid 14 from leaking out.

  Similarly to the pocket 15, the slot 16 is a space extended with the same cross-sectional shape in the width direction of the slot die 13, and is a flow path of the coating liquid 14 from the pocket 15 to the web 12. The opening 16a located on the web side is generally adjusted to have a width that is substantially the same as the coating width by using a width regulating plate (not shown) or the like. The angle between the slot 16 and the tangent in the web traveling direction of the backup roll 11 at the slot tip is generally preferably 30 ° or more and 90 ° or less, but is not limited to this range.

  The tip lip 17 of the slot die 13 where the opening 16a of the slot 16 is located is tapered, and the tip is a flat portion 17a called a land. In this flat portion 17 a, the upstream side of the web 12 in the traveling direction of the web 12 with respect to the slot 16 is hereinafter referred to as an upstream lip land 18 and the downstream side is referred to as a downstream lip land 19.

  The length ILO in the web traveling direction of the downstream lip land 19 is preferably 30 μm to 500 μm, more preferably 30 μm to 100 μm, and still more preferably 30 μm to 60 μm. Further, the length IUP of the upstream lip land 18 in the web traveling direction is not particularly limited, but is preferably used in the range of 500 μm to 1 mm.

  FIG. 2 is a schematic view (A) of the cross-sectional shape of the slot die 13 and a schematic view (B) of the cross-sectional shape of another slot die 30. In the slot die 30 shown in FIG. 2B, the land length ILO of the downstream lip land 31 is the same as the length IUP of the upstream lip land. Reference numeral 32 denotes a pocket, and 33 denotes a slot. On the other hand, in the slot die 13 shown in FIG. 2A, the downstream lip land length ILO is shorter than the upstream lip land length IUP. In the present invention, any shape of the slot die can be used. However, when coating with a film thickness of 20 μm or less, it is more preferable to use a slot die having a shape with an ILO shorter than IUP, like the slot die 13. This is preferable because a uniform film thickness can be applied with high accuracy. Furthermore, when the land length ILO of the downstream lip land 19 is in the range of 30 μm to 100 μm, a lip land with good dimensional accuracy can be formed, which is more preferable.

  Further, in order to make the film thickness of the coating film uniform with high accuracy, it is preferable that the fluctuation width in the width direction of the slot die 13 of the land length ILO of the downstream lip land 19 is within 20 μm. If the fluctuation range is within the above range, the beads can be formed more stably, and even if a disturbance or the like occurs, the beads can be prevented from becoming unstable, and the suitability for manufacturing can be maintained.

  The material of the slot die is not particularly limited, but from the viewpoint of improving the strength and surface condition of the tip lip 17 including the opening a of the slot 16, the material of the slot die including at least this portion is made of a carbide material. Is preferred. By using a super hard material, the homogeneity of the surface shape can be improved, and wear of the tip lip due to the coating liquid that is always discharged can be prevented. This is particularly effective when applying a magnetic liquid containing an abrasive as the coating liquid. An example of the super hard material is a material mainly composed of WC. For example, a material prepared by bonding a WC carbide crystal with a bonding metal such as Co can be used. The bonding metal is not limited to Co, and various metals including Ti, Ta, and Nb can also be used. The average particle size of the WC crystal is not particularly limited, but the average particle size is preferably small and is preferably within 5 μm.

Furthermore, in order to maintain the coating thickness of the thin layer uniformly with high accuracy, not only the dimensional accuracy at the tip of the slot die 10 but also the accuracy of the straightness of the backup roll 13 is important. Therefore, in addition to maintaining the dimensional accuracy in the application width direction of the land length ILO of the downstream lip land 19, it is preferable that the straightness accuracy of both the tip lip 17 of the slot die 13 and the backup roll 11 is high. The straightness can be determined with sufficient accuracy practically by the following formula (1). However, even a slot die coater that does not satisfy the following formula (1) can be used in the present invention. Here, as shown in FIG. 3, Po is the pressure outside the bead meniscus on the traveling direction side of the web 12, Pp is the internal pressure of the pocket 15, σ is the surface tension of the coating liquid 14, μ is the viscosity of the coating liquid 14a, U Is the coating speed, h is the film thickness, d is the length of the gap between the downstream lip land 19 and the web 12, L is the length of the slot 16 of the slot die 13, and D is the slot gap of the slot die 13. Then, the differential pressure Po-Pp between the internal pressure Pp of the pocket 15 of the slot die 13 and the pressure Po outside the bead meniscus on the web traveling direction side is made constant in the width direction of the slot die 13 and the following equation (1) is used: Find the required straightness. This is because the differential pressure between the pocket 15 of the slot die 13 and the outside of the bead meniscus is constant even if the length d of the gap between the tip of the slot die 13 and the backup roll 11 changes. This is because the flow in the width direction of the die 13 is generated in the pocket 15 and becomes a flow distribution.
Po-Pp = 1.34σ / h ・ (μU / σ) 2/3 + 12μUILO (d / 2-h) / d3-12μhUL / D3 (1)

  When coating is performed with a slot die coater under the conditions satisfying the above formula (1), in a coating system used for general industrial production, the coating film thickness distribution is 2% with a straightness in the die block width direction of about 5 μm. Degree (which may differ strictly depending on conditions). Therefore, it can be considered that this limit is the limit when high-precision thin film coating is performed. Thereby, when the slot die 13 is set at the coating position, the straightness of the tip lip and the backup roll is set so that the fluctuation width in the slot die width direction of the gap between the tip lip and the web is within 5 μm. Is preferably maintained.

A slide coater can also be used as the die coater of the present invention. The slide coater is preferably used when multilayer coating is performed. For example, when producing an optical compensation sheet having two or more optically anisotropic layers, a plurality of layers of the coating solution can be stably and simultaneously applied. The slide coater has a structure in which a plurality of blocks of dies having slot portions are stacked, and has a slide surface that supplies the coating liquid supplied from the slots as a stable multilayer flow to the web. The number of blocks to be stacked can be determined according to the number of optically anisotropic layers to be formed. Specific examples of the slide coater are described in detail in JP-A-7-318727 and JP-A-8-43625, and any of them can be used in the present invention.
In addition, various die coaters can be used in the present invention. Among the die coaters, the above-described slot die coater and slide coater are preferable, and the slot die coater having the structure shown in FIG. 2A is particularly preferable.

Next, various materials used for producing the optical compensation sheet of the present invention will be described.
[Optical compensation sheet]
One embodiment of the optical compensation sheet of the present invention comprises a transparent support, and a composition containing a liquid crystalline compound and at least one compound represented by the general formula (1) on the transparent support. It has an optically anisotropic layer formed by coating with a die coater. The composition may contain various additives in addition to at least one liquid crystalline compound and at least one compound represented by the following general formula (1). Moreover, the optical compensation sheet of the present invention may have an alignment film between the transparent support and the optically anisotropic layer.

(Compound represented by the general formula (1))
Next, the compound represented by the following general formula (1) used for the optical compensation sheet of the present invention will be described. The compound contributes to increasing the tilt angle at the air interface of the liquid crystal compound.
General formula (1)
(Rf-X-) _m Ar (-W) _n
In formula (1), Ar represents an (m + n) -valent aromatic heterocyclic group or aromatic hydrocarbon ring group, X represents a single bond or a divalent linking group, and Rf is substituted with an alkyl group or a fluorine atom. W represents a sulfo group or a carboxyl group, m represents an integer of 1 to 4, and n represents 1 or 2. When m represents an integer of 2 or more, a plurality of Rf and X may be the same or different.

  More specifically, in the general formula (1), the (m + n) -valent 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. It is the basis of. For example, a residue of an aromatic heterocyclic ring containing at least one hetero atom such as a nitrogen atom, an oxygen atom, a sulfur atom, and more specifically, a furan ring, a pyrrole ring, an imidazole ring, a pyrazole ring, an isoxazole ring , Pyridine ring, pyrimidine ring, 1,3,5-triazine ring, indole ring, indazole ring, quinoline ring and carbazole ring are preferred. The (m + n) -valent aromatic hydrocarbon ring group represented by Ar is preferably a residue of an aromatic hydrocarbon ring having 6 to 30 carbon atoms, more preferably 6 to 20 carbon atoms. Residues are most preferred. Ar is preferably a (m + n) -valent aromatic hydrocarbon ring group.

The (m + n) -valent aromatic heterocyclic group or aromatic hydrocarbon ring group represented by Ar may have a substituent other than —X—Rf and —W, and examples of the substituent Examples include the following.
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, n-octyl group, n-decyl group, n-hexadecyl group, cyclopropyl group, cyclopentyl group, cyclohexyl group and the like, alkenyl group (preferably having 2 to 20 carbon atoms, more preferably 2 to 12 carbon atoms, Particularly preferred are alkenyl groups having 2 to 8 carbon atoms, such as vinyl group, aryl group, 2-butenyl group and 3-pentenyl group), alkynyl groups (preferably having 2 to 20 carbon atoms, more preferred). Is an alkynyl group having 2 to 12 carbon atoms, particularly preferably 2 to 8 carbon atoms, such as propargyl group and 3-pentynyl group. An aryl group (preferably an aryl group having 6 to 30 carbon atoms, more preferably 6 to 20 carbon atoms, particularly preferably 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 an amino group having 0 to 20 carbon atoms, more preferably 0 to 10 carbon atoms, and particularly preferably 0 to 6 carbon atoms. Group, methylamino group, dimethylamino group, diethylamino group, anilino group, etc.),

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 a substituent other than —X—Rf and —W of Ar, an alkyl group, an aryl group, an alkoxy group, an alkoxycarbonyl group, an acyloxy group, an acylamino group, a sulfonylamino group, and an alkylthio group are preferable, and an alkyl group, particularly preferably An alkoxy group, an alkoxycarbonyl group, and an acyloxy group. However, Ar is most preferably not substituted with a substituent other than —X—Rf and —W.

In the formula (1), the divalent linking group represented by X is an alkylene group, an alkenylene group, a divalent aromatic group, a divalent heterocyclic residue, -CO-, -NR ^a- (R ^a Is a divalent linking group selected from the group consisting of an alkyl group having 1 to 5 carbon atoms or a hydrogen atom), —O—, —S—, —SO—, —SO ₂ — and combinations thereof. Is preferred. 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. The alkylene group, alkenylene group and arylene group may be substituted with a group exemplified as the above-described Ar substituent (eg, alkyl group, halogen atom, cyano, alkoxy group, acyloxy group, etc.) if possible. .
X is preferably a divalent linking group, and more preferably a divalent linking group selected from the group consisting of an alkylene group, —O—, —S—, and combinations thereof.

  The alkyl group represented by Rf may have a cyclic structure or a branched structure. It is preferable that it is C1-C20, it is more preferable that it is C4-C20, and it is especially preferable that it is C8-C20.

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, and has 4 to 16 carbon atoms. It is more preferable, and 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.

Rf1: n-C ₈ F ₁₇ −
_{Rf2: n-C 6 F 13} -
_{Rf3: n-C 4 F 9} -
_{Rf4: n-C 8 F 17} - (CH 2) 2 -
_{Rf5: n-C 6 F 13} - (CH 2) 2 -
_{Rf6: n-C 4 F 9} - (CH 2) 2 -
_{Rf7: n-C 8 F 17} - (CH 2) 3 -
_{Rf8: n-C 6 F 13} - (CH 2) 3 -
_{Rf9: n-C 4 F 9} - (CH 2) 3 -
_{Rf10: H- (CF 2) 8} -
Rf11: H— (CF ₂ ) ₆ —
Rf12: H— (CF ₂ ) ₄ —
_{Rf13: H- (CF 2) 8} - (CH 2) -
Rf14: H— (CF ₂ ) ₆ — (CH ₂ ) —
_{Rf15: H- (CF 2) 4} - (CH 2) -
_{Rf16: n-C 4 F 9} -CH 2 CH 2 - (n-C 4 F 9 -CH 2 CH 2 -) CHCH 2 -

  W is preferably a sulfo group, m is preferably 1 or 2, and n is preferably 1.

  The following general formula (1a) is included in the range of the general formula (1).

一般式（１ａ）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。

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

  The range of the general formula (1) includes the following general formula (2).

General formula (2)
(Rf ¹ -X ^1- ) ₂ Ar ¹ (-W ¹ ) _n1
In Formula (2), 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 (2), 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 (1). And the preferred range is also the same. In formula (2), two X ¹ and Rf ¹ may be the same or different from each other.

  Among the compounds represented by the general formula (2), a compound represented by the following general formula (2a) is preferable.

一般式（２ａ）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。

In the general formula (2a), 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 (2a), X ³ and Rf ³ has the same meaning as X ¹ and Rf ¹ in formula (2), and their preferred ranges are also the same.

  Specific examples of the compound represented by the general formula (1) are shown below, but the compound used in the present invention is not limited thereto.

  The compound represented by the general formula (1) can be easily synthesized by combining a general alkylation reaction of a hydroxy group and a sulfonation reaction of an aromatic compound.

  The addition amount of the compound represented by the general formula (1) is preferably 0.01 to 20% by mass, particularly preferably 0.05 to 10% by mass, and 0.05 to 1% by mass of the amount of the liquid crystal compound. % Is most preferred. In this invention, 1 type of the compound represented by the said General formula (1) may be used, and 2 or more types may be used. When using 2 or more types, it is preferable that at least 1 type is a compound represented by the said General formula (2). A combination of at least one compound represented by the general formula (1a) and at least one compound represented by the general formula (2) is preferable, and at least one compound represented by the general formula (1a) is preferable. And a combination of at least one of the compounds represented by the general formula (2a) is more preferable.

(Liquid crystal compound)
The optical compensation sheet of the present invention has optical anisotropy expressed by the orientation of the liquid crystal compound. In the optically anisotropic layer, the molecules of the liquid crystalline compound are preferably fixed in the alignment state, and more preferably fixed in the hybrid alignment state. There is no restriction | limiting in particular about the liquid crystalline compound used for this invention, A various compound can be used. It is preferable to use a rod-like liquid crystal compound or a discotic liquid crystal compound, and it is more preferable to use a discotic liquid crystal compound. The liquid crystal compound may be a polymer liquid crystal or a low molecular liquid crystal. Furthermore, the low molecular liquid crystalline compound is cross-linked when forming a layer, and includes those that 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 crystalline 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. Regarding rod-like liquid crystalline compounds, for example, Quarterly Chemical Review Vol. 22, Liquid Crystal Chemistry (1994), Chapter 4, Chapter 7 and Chapter 11 of the Chemical Society of Japan 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 compound preferably has a polymerizable group in order to fix its alignment state. The polymerizable group is preferably an unsaturated polymerizable group or an epoxy group, more preferably an unsaturated polymerizable group, and most preferably an ethylenically unsaturated polymerizable group.

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

  The discotic liquid crystalline compound also includes a compound having a structure 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. The molecule or the assembly of molecules is preferably a compound having rotational symmetry and imparting a certain orientation. The optically anisotropic layer formed from the discotic liquid crystalline compound does not necessarily require that the compound finally contained in the optically anisotropic layer is a discotic liquid crystalline compound. Also included are compounds having a group that reacts with heat or light and, as a result, polymerized or cross-linked by reaction with heat or light, resulting in a high molecular weight and loss of liquid crystallinity. Preferred examples of the discotic liquid crystalline compound are described in JP-A-8-50206. Moreover, about superposition | polymerization of a discotic liquid crystalline compound, Unexamined-Japanese-Patent No. 8-27284 has description.

  In order to fix the discotic liquid crystalline compound by polymerization, it is necessary to bond a polymerizable group as a substituent to the discotic core of the discotic liquid crystalline compound. However, when the polymerizable group is directly connected to the disc-shaped core, it becomes difficult to maintain the orientation state in the polymerization reaction. Therefore, a linking group is introduced between the discotic core and the polymerizable group. Accordingly, the discotic liquid crystalline compound having a polymerizable group is preferably a compound represented by the following formula (III).

General formula (III)
D (-LQ) _n
In general formula (III), D is a discotic core, L is a divalent linking group, Q is a polymerizable group, and n is an integer of 4 to 12.

  An example of the disk-shaped core (D) is shown below. In each of the following examples, LQ (or QL) means a combination of a divalent linking group (L) and a polymerizable group (Q).

  In the hybrid alignment, the angle between the major axis of the liquid crystal compound (disk surface in the case of a discotic liquid crystal compound) and the surface of the support, that is, the tilt angle, is the depth of the optically anisotropic layer (that is, perpendicular to the transparent support). N) increase or decrease in the direction. The angle preferably increases with increasing distance from the support surface. Further, the change in the tilt angle can be continuous increase, continuous decrease, intermittent increase, intermittent decrease, change including continuous increase and continuous decrease, or intermittent change including increase and decrease. . The intermittent change includes a region where the inclination angle does not change in the middle of the thickness direction. Even if a region where the angle does not change is included, it may be increased or decreased as a whole. However, it is preferred that the tilt angle changes continuously.

  The average direction (average of the major axis direction of each molecule) of the long axis of the liquid crystal compound (disk surface in the case of a discotic liquid crystal compound) is generally determined by selecting the liquid crystal compound or the material of the alignment film, or the rubbing method It can be adjusted by selecting. The major axis of the liquid crystal compound on the surface side (air side) (disk surface in the case of a discotic liquid crystal compound) is selected by selecting the type of the liquid crystal compound and used in combination with the liquid crystal compound. It can be adjusted by the action of the compound represented by (1).

  In addition to the liquid crystal compound and the compound represented by the general formula (1), other additives may be contained in the optically anisotropic layer. Examples of other additives include plasticizers, surfactants, polymerizable monomers and polymers. These additives are preferably compatible with essential components such as a liquid crystal compound and contribute to control of the tilt angle of the liquid crystal compound or do not inhibit the alignment.

(Cellulose ester)
It is preferable to include a cellulose ester in the composition for forming an optically anisotropic layer because the tilt angle of the liquid crystal compound molecules on the air interface side can be further increased. The cellulose ester also contributes to reducing the occurrence of cissing when the composition is applied on the support surface or the like. Preferred examples of the cellulose ester that can be used in the present invention include cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, hydroxypropyl cellulose, methyl cellulose, and carboxymethyl cellulose. Of these, cellulose acetate butyrate is preferable. The addition amount of the cellulose ester is a mass percentage with respect to the total amount of the liquid crystal compound, preferably 0.01 to 8%, more preferably 0.01 to 2%, and still more preferably 0.01 to 1%. .

(Fluoroaliphatic group-containing polymer)
The optically anisotropic layer preferably further contains a fluoroaliphatic group-containing polymer. The fluoroaliphatic group-containing polymer can be contained in the composition (coating liquid) used when forming the optically anisotropic layer. The fluoroaliphatic group-containing polymer contributes to prevention of unevenness in the optically anisotropic layer. In the conventional large-sized liquid crystal display device, there was a problem of display unevenness due to the optical film, but by using the optical compensation sheet of the present invention, the unevenness of the large-sized liquid crystal display device was reduced and the image quality of the large-sized liquid crystal display device was reduced. Can be improved.

  In the present invention, as the fluoroaliphatic group-containing polymer, it is preferable to use a polymer containing at least one repeating unit derived from a monomer represented by the following general formula (3).

一般式（３）中、Ｒ¹は水素原子又はメチル基を表し、Ｘは酸素原子、イオウ原子または−Ｎ（Ｒ²）−を表し、Ｈ^fは水素原子またはフッ素原子を表し、Ｒ²は水素原子または炭素数１〜４のアルキル基、具体的にはメチル基、エチル基、プロピル基、ブチル基を表し、好ましくは水素原子またはメチル基である。Ｘは酸素原子が好ましい。ｍは１〜６の整数であり、１又は２が好ましい。ｎは２〜４の整数であり、２又は３が好ましい。前記重合体は、複数種の前記一般式（３）で表されるモノマーの共重合体であってもよい。
一般式（３）で表されるフルオロ脂肪族基含有モノマーのより具体的なモノマーの例を以下にあげるがこの限りではない。

In the general formula (3), R ¹ represents a hydrogen atom or a methyl group, X represents an oxygen atom, a sulfur atom or —N (R ² ) —, H ^f represents a hydrogen atom or a fluorine atom, and 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, and preferably a hydrogen atom or a methyl group. X is preferably an oxygen atom. m is an integer of 1-6, and 1 or 2 is preferable. n is an integer of 2 to 4, and 2 or 3 is preferable. The polymer may be a copolymer of a plurality of types of monomers represented by the general formula (3).
Although the example of the more specific monomer of the fluoro aliphatic group containing monomer represented by General formula (3) is given to the following, it is not this limitation.

  The fluoroaliphatic compound can be produced by a telomerization method (telomer method) or an oligomerization method (oligomer method). 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.

  The fluoroaliphatic group-containing polymer may be a copolymer further containing a repeating unit derived from a monomer represented by the following general formula (4).

一般式（４）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は置換もしくは無置換のポリ（アルキレンオキシ）基、置換基もしくは無置換の炭素数１〜２０の直鎖、又は炭素数４〜２０の分岐もしくは炭素数３〜２０の環状のアルキル基を示す。

In the general formula (4), R ³ represents a hydrogen atom or a methyl group, Y represents a divalent linking group, R ⁴ represents a substituted or unsubstituted poly (alkyleneoxy) group, a substituted or unsubstituted carbon. 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 is shown.

The divalent linking group represented by Y is preferably an oxygen atom, a sulfur atom or —N (R ⁵ ) —. 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. R ⁵ is more preferably a hydrogen atom or a methyl group. Y is more preferably an oxygen atom, —N (H) — or —N (CH ₃ ) —.

The poly (alkyleneoxy) group which may have a substituent represented by R ⁴ can be represented by (RO) _x , where R is an alkylene group having 2 to 4 carbon atoms, for example —CH _{2 CH 2 -, - CH 2} CH 2 CH 2 -, - CH (CH 3) CH 2 - or _{-CH (CH 3) CH (CH} 3) - is preferably.
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. Good. It may be present as a linear or branched propyleneoxy or ethyleneoxy unit, a linear or branched propyleneoxy unit block or an ethyleneoxy unit block.

  In the 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) ) May be connected. If the chain bond has three or more valences, branched alkyleneoxy units can be obtained. The amount of the poly (alkyleneoxy) group compound is suitably 250 to 3,000.

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 that may be linear and branched, ethyl Group, propyl group, butyl group, pentyl group, hexyl group, heptyl group, octyl group, nonyl group, decyl group, undecyl group, dodecyl group, tridecyl group, tetradecyl group, pentadecyl group, octadecyl group, eicosanyl group, etc .; cyclohexyl group 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. included.

The poly (alkyleneoxy) group or alkyl group represented by R ⁴ may be substituted, and examples of the substituent include a hydroxyl group, an alkylcarbonyl group, an arylcarbonyl group, an alkylcarbonyloxy group, a carboxyl group, and an alkyl ether group. , Aryl ether groups, halogen atoms such as fluorine atom, chlorine atom and bromine atom, nitro group, cyano group, amino group and the like, but not limited thereto.

The monomer represented by the general formula (4) is particularly preferably alkyl (meth) acrylate or poly (alkyleneoxy) (meth) acrylate.
Specific examples of the monomer represented by the general formula (4) are shown below, but not limited thereto.

  Poly (alkyleneoxy) acrylate and methacrylate are commercially available hydroxypoly (alkyleneoxy) materials such as “Pluronic” (Pluronic (Asahi Denka Kogyo Co., Ltd.)), “Adeka Polyether” (Asahi Denka Kogyo ( "Carbowax" (Carbowax (Glico Products)), "Triton" (Toriton (Rohm and Haas)) and "PEG" (Daiichi Kogyo Seiyaku Co., Ltd.) Can be produced by reacting the products sold as) with acrylic acid, methacrylic acid, acrylic chloride, methacryl chloride, acrylic anhydride, etc. In addition, poly (oxyalkylenes) produced by known methods ) Diacrylate can also be used.

  Examples of the fluoroaliphatic group-containing polymer include a homopolymer of a monomer represented by the general formula (3), a monomer represented by the general formula (3), and a monomer represented by the general formula (4) ( More preferably, a copolymer with polyalkyleneoxy (meth) acrylate, more preferably polyethyleneoxy (meth) acrylate or polypropyleneoxy (meth) acrylate) is preferable.

  The fluoroaliphatic group-containing polymer used in the present invention is a copolymer containing repeating units other than the repeating units derived from the monomers represented by the general formula (3) and the general formula (4). Also good. A preferable copolymerization ratio of the monomer copolymerizable with each of the above monomers is 20 mol% or less, more preferably 10 mol% or less in all monomers. As such a monomer, those described in pages 1 to 483 of Chapter 2 of “Polymer Handbook 2nd ed., J. Brandrup, Wiley lnterscience (1975)” can be used. For example, a compound 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. I can give you.

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 (for example, 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:
Dimethyl itaconate, diethyl itaconate, dibutyl itaconate, etc.
Dialkyl or monoalkyl esters of fumaric acid:
Dibutyl fumarate etc. Others such as crotonic acid, itaconic acid, acrylonitrile, methacrylonitrile, maleilonitrile, styrene.

  The amount of the fluoroaliphatic group-containing monomer represented by the general formula (3) in the fluoroaliphatic group-containing polymer is preferably 5 mol% or more of the total amount of constituent monomers of the polymer, more preferably 20 The mol% or more, more preferably 30 mol% or more. The amount of the monomer represented by the general formula (4) in the fluoroaliphatic group-containing polymer of the present invention is preferably 10 mol% or more of the total amount of constituent monomers of the fluoroaliphatic group-containing polymer, more preferably It is 15-70 mol%, More preferably, it is 20-60 mol%.

The weight average molecular weight of the fluoroaliphatic group-containing polymer is preferably 3,000 to 100,000, more preferably 6,000 to 80,000.
Furthermore, the content of the fluoroaliphatic group-containing polymer in the composition for forming an optically anisotropic layer is preferably 0.005 to 8% by mass, more preferably 0.01 to 1% by mass. Yes, more preferably 0.05 to 0.5% by mass. By making the addition amount of the fluoroaliphatic group-containing polymer 0.005% by mass or more, a better one can be obtained, and by making the addition amount 8% by mass or less, the coating film cannot be sufficiently dried. Or adversely affecting the performance as an optical film (for example, uniformity of retardation) can be more effectively prevented.

The fluoroaliphatic group-containing polymer can be produced by a known 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 molar ratio of each monomer component. Mw represents a weight average molecular weight.

(Compound having 1,3,5-triazine ring group)
The optically anisotropic layer may contain a compound having a 1,3,5-triazine ring group. The compound contributes to stably transferring a liquid crystal compound, particularly a discotic liquid crystal compound, from a horizontal alignment state to a hybrid alignment state. The compound having a 1,3,5-triazine ring group can be contained in the composition used when forming the optically anisotropic layer. In addition, as a compound which has a 1,3,5-triazine ring group which can be used for this invention, the compound represented by the following general formula (5) or (6) is preferable.

In the general formula (5), L ¹ , L ² and L ³ each independently represents a single bond or a divalent linking group, A ¹ , A ² and A ³ each independently represents an alkylene group, m ₂ , m ₃ and m ₄ represent an integer of 0 or more. R ^10, R ¹¹ and R ¹² are each independently an organic group, when m ₂ is 0, R ¹⁰ is an alkyl group, when m ₃ is 0, R ¹¹ is an alkyl group, m ₄ is When 0, R ¹² is an alkyl group.

In the general formula (6), X ⁴ and Y ⁴ each independently represent NR ^a (R ^a represents a hydrogen atom or an alkyl group), O or S, and Z ⁴ represents a divalent linking group. R ¹³ , R ¹⁴ , R ¹⁵ and R ¹⁶ each independently represents a substituent.

First, the compound represented by the general formula (5) 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—, —NR ^a — (R ^a is an alkyl group or a hydrogen atom), —O—, —S—. It is preferably a divalent linking group selected from the group consisting of, -SO-, -SO ₂ -and combinations thereof. More ^{preferably, -CO -, - NR a -} , - O -, - S -, - SO 2 - and a divalent linking group selected from these groups, still more preferably -CO -, - NR ^a A divalent linking group selected from the group consisting of-, -O-, -S- and -SO _2- , or a combination of two or three types of divalent linking groups selected from the group. Most preferably, it is a divalent linking group selected from the group consisting of —NR ^a —, —O— and —S—, or a combination of two or three types of divalent linking groups selected from the group.

The alkylene group represented by each of A ¹ , A ^2, and A ³ may be linear, branched, or substituted. The substituted or unsubstituted alkylene group is preferably an alkylene group having 2 to 30 carbon atoms. Examples thereof include —CH ₂ —, — (CH ₂ ) ₂ —, —CH ₂ CH (CH ₃ ). _{-, - CH 2 C (CH} 3) 2 - and - (CH _{2) 4} -) are included. Preferably _{- (CH 2) 2 -,} - CH 2 CH (CH 3) -, - (CH 2) 4 - a.

m ² , m ³ and m ⁴ each represent an integer of 0 or more, preferably 1 to 10, more preferably 1 to 5.

Examples of the organic group represented by each of R ¹⁰ , R ¹¹ and R ¹² include 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 polycycloalkyl 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 (straight 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 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) or an alkynyl group (preferably a group having 2 to 30 carbon atoms). Or unsubstituted alkynyl group 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 nitrogen atom, an oxygen atom and a sulfur atom are A heterocyclic group having at least one atom, more preferably a 5- or 6-membered aromatic heterocyclic group having 3 to 30 carbon atoms, such as a 2-furyl group, 2-thienyl group, 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, such as an aromatic heterocyclic group represented by Ar in the general formula (1) or It is synonymous with the group quoted as the substituent of the aromatic hydrocarbon ring group, and its preferred 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.

  Among the compounds represented by the general formula (5), compounds represented by the following general formula (5a) are preferable.

In the general formula (5a), A ¹ , A ² and A ³ each independently represent an alkylene group, m ₂ , m ₃ and m ₄ represent an integer of 0 or more, and R ¹⁰ , R ¹¹ and R ¹² represent Each independently an organic group, 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 It is.

In general formula (5a), A ¹ , A ² and A ³ , m ₂ , m ₃ and m ₄ , R ¹⁰ , R ¹¹ and R ¹² have the same meanings as in general formula (5), and the preferred ranges are also the same. It is.

Next, the compound represented by the general formula (6) will be described in detail.
In the formula, the divalent linking group represented by Z ⁴ includes an alkylene group, an alkenylene group, a divalent aryl group, a divalent heterocyclic residue, —CO—, —SO—, —SO ₂ — and the like. A divalent linking group selected from the group consisting of:

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 , A cyclohexyl group, a cyclopentyl group, and a 4-n-dodecylcyclohexyl group, and a multicycloalkyl group such as a bicycloalkyl 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 or a bicyclo (2.2.2) octane-3-yl group) And a group having a polycyclic structure such as a tricycloalkyl group, preferably a monocyclic cycloalkyl group or a bicycloalkyl group, and a monocyclic cycloalkyl group is preferred.

An alkenyl group (straight 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 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) and tricycloalkenyl groups, and monocyclic cycloalkenyl groups are preferred. Kiniru 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 Selected from a carbon atom, a nitrogen atom and a sulfur atom, and a heterogeneity of either a nitrogen atom, an oxygen atom or a sulfur atom A heterocyclic group having at least one child, more preferably a 5- or 6-membered aromatic heterocyclic group having 3 to 30 carbon atoms, such as 2-furyl group, 2-thienyl group, 2-pyridyl group. 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, 3- (2-ethylhexyloxy) propyl Amino group, 3- (2-hexyldecanooxy) propylamino group, 3-dodecyloxypropylamino group, 3- (3-perfluorohexylpropyloxy) propylamino group, 3- (3- (6H-perfluoro) Hexyl) propyloxy) propylamino group, anilino group, N-methyl-anilino group, diphenylamino group, 2-methyl Ruoxyanilino 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, and a substituted or unsubstituted arylcarbonylamino group having 6 to 30 carbon atoms, such as formylamino group, acetylamino group, and pivaloylamino. Group, lauroylamino group, benzoylamino group, 3,4,5-tri 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, such as 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, methyl Ruhoniruamino 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-dodecyloxy) Propyl) sulfamoyl group, N, N- dimethyl sulfamoyl mottle, N- acetyl sulfamoyl group, N- benzoylsulfamoyl group, N- (N'-phenylcarbamoyl) sulfamoyl group), a sulfo group,

Alkyl and arylsulfinyl groups (preferably substituted or unsubstituted alkylsulfinyl groups having 1 to 30 carbon atoms, substituted or unsubstituted arylsulfinyl groups having 6 to 30 carbon atoms such as methylsulfinyl group, ethylsulfinyl group, phenyl A sulfinyl group, a p-methylphenylsulfinyl group), an alkyl and an arylsulfonyl group (preferably a substituted or unsubstituted alkylsulfonyl group having 1 to 30 carbon atoms, a substituted or unsubstituted arylsulfonyl group 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 30 carbon atoms) Substituted or unsubstituted For example, an acetyl group, a pivaloyl group, a 2-chloroacetyl group, a stearoyl group, a benzoyl group, a pn-octyloxyphenylcarbonyl group), an aryloxycarbonyl group (preferably having 7 to 30 carbon atoms). A 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 atom, iodine atom),

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), arylazo 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 A phenylazo group, a p-chlorophenylazo group, a 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 substituents, those having a hydrogen atom may be substituted with the above groups after removing this. Examples of such a substituent include an alkylcarbonylaminosulfonyl group, an arylcarbonylaminosulfonyl group, an alkylsulfonylaminocarbonyl group, and an arylsulfonylaminocarbonyl group. Specifically, a methylsulfonylaminocarbonyl group, p- Examples thereof include a methylphenylsulfonylaminocarbonyl group, an acetylaminosulfonyl group, and a benzoylaminosulfonyl group.

  These substituents may be further substituted with these substituents. Moreover, when it has two or more substituents, those substituents 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, di Enylamino 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).

  Among the compounds represented by the general formula (6), a compound represented by the following general formula (6a) is particularly preferable.

In the general formula (6a), Z ⁵ represents a poly (alkyleneoxy) group, R ^a represents ^a hydrogen atom or an alkyl group, R ¹⁷ , R ¹⁸ , R ¹⁹ and R ²⁰ each independently represents a substituent, j1, j2, j3 and j4 each represents an integer of 0 to 5. When j1, j2, j3 and j4 are 2 or more, a plurality of R ¹⁷ , R ¹⁸ , R ¹⁹ and R ²⁰ may be the same or different, and may be bonded to each other to form a ring.

  j1, j2, j3 and j4 each represents an integer of 0 to 5. Preferably it is 1, 2 or 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 (6). Preferred are a substituted or unsubstituted alkoxy group, an alkylthio group, an alkylamino group, and an arylamino group. 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 that can be used in the present invention are shown below, but the compound used in the present invention is not limited thereto.

  The addition amount of the compound having a 1,3,5-triazine ring group is preferably 0.01 to 20% by mass relative to the liquid crystal compound (preferably a discotic liquid crystal compound), 0.05 More preferably, it is 10 mass%, It is further more preferable that it is 0.1-5 mass%.

(Method for producing optically anisotropic layer)
The optically anisotropic layer can be formed by applying a composition containing a liquid crystalline compound or the like directly on the support surface or on the alignment film surface provided on the support using a slot die coater. . The composition for forming an optically anisotropic layer contains a liquid crystal compound, a compound represented by the general formula (1), and various additives as required. It is preferable to prepare a coating solution by dissolving these raw materials in a solvent and apply the solution to the surface of the support. There is no restriction | limiting in particular about the alignment film used for formation of an optically anisotropic layer, After forming polymer layers, such as polyvinyl alcohol, the alignment film formed by rubbing the surface of this polymer layer to a predetermined direction Etc. are available. A preferred example of the alignment film is described in JP-A-8-338913. The thickness of the alignment film is preferably 10 μm or less. The alignment film may be used only at the time of forming the optically anisotropic layer, and after the optically anisotropic layer is formed, it may be peeled off if possible. In such a case, after forming an alignment film on the temporary support and forming an optically anisotropic layer on the alignment film, the optically anisotropic layer is transferred to a transparent support, and the optical compensation of the present invention is performed. A sheet may be produced.

  As a 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. When producing a highly uniform optical film, the surface tension of the coating solution is preferably 25 mN / m or less, and more preferably 22 mN / m or less.

  In the present invention, the coating solution is applied using a die coater as described above. When the optical compensation sheet of the present invention has a plurality of optically anisotropic layers, at least one optically anisotropic layer may be a layer formed by coating using a die coater, and other layers Is not particularly limited. For example, other optically anisotropic layers are formed by known coating methods (eg, wire bar coating method, extrusion coating method, direct gravure coating method, reverse gravure coating method, die coating method, slot die coating method). May be. However, when forming a plurality of optically anisotropic layers, it is preferable to form them simultaneously using a slide die coater.

  After the coating solution is applied to the surface of the support or the alignment film, the liquid crystalline molecules are brought into a desired alignment state. Hereinafter, a method for forming an optically anisotropic layer by hybrid alignment of liquid crystalline molecules will be described in detail. First, the liquid crystal compound was horizontally aligned in the presence of the compound represented by the general formula (1) and optionally other additives such as cellulose ester (first alignment step), and then horizontally aligned. It is preferable to transfer the liquid crystal compound to the hybrid alignment (second alignment step). According to this method, it is possible to quickly transfer to hybrid alignment with few defects such as alignment defects, and productivity is improved.

  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. As a result, the alignment state of the liquid crystal compound can be transferred from the horizontal alignment to the hybrid alignment. 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.

  As described above, the liquid crystal compound can be aligned in a desired alignment state by supplying energy from the outside. However, by forming an optically anisotropic layer on the alignment film, or by aligning the liquid crystal compound. A desired alignment state can also be achieved by adding a compound capable of controlling the state (such as a horizontal alignment agent) to the optically anisotropic layer. In particular, when an additive that promotes horizontal alignment such as the compound having the 1,3,5-triazine ring group is used together with the compound represented by the general formula (1), the hybrid alignment can be performed more quickly and with fewer defects. The optically anisotropic layer can be produced, which is preferable.

Preferred embodiments of the method for producing the optically anisotropic layer include the following methods.
Liquid crystalline compound, compound represented by general formula (1) (preferably compound represented by general formula (2), more preferably compound represented by general formula (1a) and general formula (2) And a first alignment step of horizontally aligning the liquid crystalline compound at a temperature T ₁ ° C. in the presence of a cellulose ester and / or a compound having a 1,3,5-triazine ring group, if desired. And after the first alignment step, a second alignment step of hybrid aligning the liquid crystalline compound at a temperature of T ₂ ° C (where T ₁ <T ₂ ), and bringing the hybrid aligned liquid crystal compound into its alignment state It is a manufacturing method of the optically anisotropic layer including the fixing process to fix.

In the first alignment step, heating is performed to a nematic phase formation temperature, and further, the temperature is increased to a temperature (T ₁ ° C) that takes a horizontal alignment state in the liquid crystal phase state (first alignment step). At the temperature T ₁ ° C., the liquid crystal (particularly the discotic liquid crystal) is in a horizontal alignment state. Thereafter, the temperature is further raised to a high temperature region (T ₂ ° C) in the temperature range exhibiting the liquid crystal phase state, and the state is shifted 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 a liquid crystalline compound, particularly a discotic liquid crystalline compound, can be rapidly manufactured while suppressing the occurrence of alignment defects.

In the production method, temperature control in the alignment process of the liquid crystal compound is important. The temperature (T ₁ ° C.) exhibiting a horizontal alignment state, preferably 50 to 200 ° C., more preferably from 70 to 200 ° C., particularly preferably 70 to 120 ° C..

The temperature that exhibits the horizontal alignment state (T ₁ ° C) is lower than the temperature that exhibits the hybrid alignment state (T ₂ ° C). The temperature difference (T ₂ −T ₁ ) is preferably 10 ° C. or more, and more preferably 20 ° C. or more.
T ₁ and T ₂ ° C. 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 the temperatures, T ₁ and T ₂ can be set accordingly. it can. Further, the time for maintaining each temperature at T ₁ ° C and T ₂ ° C and the time for changing from T ₁ ° C to T ₂ ° C can be appropriately set according to the type of the liquid crystalline compound.

  After making a liquid crystal compound into a desired alignment state, it fixes to the alignment state and forms an optically anisotropic layer. 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. The coating solution preferably contains a polymerizable monomer or a polymerization initiator that contributes to the fixation of the liquid crystalline compound. As the polymerizable monomer, for example, a compound having a vinyl group, a vinyloxy group, an acryloyl group, and a methacryloyl group is preferable. Generally the addition amount of the said compound is 1-50 mass% with respect to a liquid crystalline compound, and it is preferable that it is 5-30 mass%. In addition, when a monomer having 4 or more polymerizable reactive functional groups is mixed and used, adhesion between the alignment film and the optically anisotropic layer can be improved.

Examples of photopolymerization initiators include α-carbonyl compounds (described in US Pat. Nos. 2,367,661 and 2,367,670), acyloin ethers (described in US Pat. No. 2,448,828), α-hydrocarbon substituted aromatic acyloin compounds ( US Pat. No. 2,722,512), a polynuclear quinone compound (described in US Pat. Nos. 3,046,127 and 2,951,758), a combination of triarylimidazole dimer and p-aminophenyl ketone (described in US Pat. No. 3,549,367), acridine Phenazine compounds (described in JP-A-60-105667 and US Pat. No. 4,239,850) and oxadiazole compounds (described in US Pat. No. 4,221,970) are included.
The amount of the photopolymerization initiator used is preferably 0.01 to 20% by mass, more preferably 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 ^{20mJ / cm 2 ~5000mJ / cm 2} , a range of 100mJ / cm ² ~800mJ / cm ² More preferably. In order to accelerate the photopolymerization reaction, light irradiation may be performed under heating conditions.

  The thickness of the optically anisotropic layer thus formed is preferably 0.1 to 20 μm, more preferably 0.5 to 15 μm, and most preferably 1 to 10 μm. A protective layer may be provided on the optically anisotropic layer.

(Transparent support)
The optical compensation sheet of the present invention has a support. The support is preferably glass or a transparent polymer film. The support is preferably transparent, and specifically, the light transmittance is preferably 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-based 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. The number of carbon atoms is particularly 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.

  Even in the case of conventionally known polymers such as polycarbonate and polysulfone that easily develop birefringence, the birefringence expression can be controlled by modifying the molecule as described in WO00 / 26705. For example, it can be used for the optical film of the present invention.

  When the optical compensation sheet of the present invention is used for a polarizing plate protective film or a retardation film, cellulose acetate having an acetylation degree of 55.0 to 62.5% is used as a polymer film used as a support. It is preferable. 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 (test method for cellulose acetate and the like).

  The viscosity average degree of polymerization (DP) of cellulose acetate used as the support 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.

  The optical compensation sheet of the present invention can be used alone as a member of a liquid crystal display device, but can also be integrated with a polarizing plate and incorporated into a liquid crystal display device as one member in the polarizing plate. The polarizing plate in which the optical compensation sheet of the present invention is integrated not only has a polarizing function but also contributes to an increase in the viewing angle of the liquid crystal display device. Furthermore, the use of the polarizing plate using the optical compensation sheet of the present invention as a protective film for the polarizing film contributes to the thinning of the liquid crystal display device.

Hereinafter, the polarizing plate to which the optical compensation sheet of the present invention is added will be described in detail.
[Polarizer]
In general, a polarizing plate has a polarizing film produced by adsorbing and orienting a dichroic substance on a base film and a protective film bonded to at least one surface of the polarizing film. As a polymer used for the base film of the polarizing film, a polyvinyl alcohol (hereinafter referred to as PVA) polymer is generally used. As the dichroic substance, iodine or a dichroic dye is used alone or in combination. As the protective film, physical properties such as low birefringence, transparency, moderate moisture permeability, and dimensional stability are required, and conventionally, cellulose acetate film has been widely used, and methylene chloride, which is a chlorinated organic solvent, is used in the production thereof. The improvement is desired from the viewpoint of environmental conservation. A cellulose acylate film produced using a non-chlorine organic solvent is obtained by casting the film with a non-chlorine solvent to produce a film.

  Here, the PVA used for the polarizing film is usually saponified polyvinyl acetate, but can be copolymerized with vinyl acetate such as unsaturated carboxylic acid, unsaturated sulfonic acid, olefins, and vinyl ethers. You may contain a component. In addition, modified PVA containing an acetoacetyl group, a sulfonic acid group, a carboxyl group, an oxyalkylene group, or the like can also be used. The degree of saponification of PVA is not particularly limited, but is preferably 80 to 100 mol%, particularly preferably 90 to 100 mol% from the viewpoints of solubility, polarization, heat resistance, moisture resistance, and the like. The degree of polymerization of PVA is not particularly limited, but is preferably 1000 to 10,000, and particularly preferably 1500 to 5000, from the viewpoint of film strength, heat resistance, moisture resistance, stretchability, and the like. Moreover, it does not specifically limit about the syndiotacticity of PVA, It can also take arbitrary values according to the objective.

  In order to prepare a polarizing film by dyeing and stretching PVA, a method of stretching a PVA film as a raw fabric in a dry or wet manner and then immersing it in a solution of iodine or dichroic dye, iodine or dichroic dye There are a method of stretching and orienting a PVA film in the above solution, a method of stretching and orienting a PVA film in iodine or a dichroic dye, and then stretching and orienting it in a wet or dry manner. Moreover, when forming a PVA raw fabric by a solution casting method, a method of previously containing a dichroic substance in the PVA solution can be used.

  A manufacturing method by wet stretching of a typical polarizing plate will be described below. First, the raw fabric PVA film is pre-swelled with an aqueous solution. Subsequently, it is immersed in the solution of a dichroic substance, and a dichroic substance is adsorbed. Further, it is uniaxially stretched in the traveling direction in an aqueous solution of a boron compound such as boric acid. If necessary, a color adjustment bath, a curing bath or the like may be provided after this. When it is dried to some extent, a protective film is bonded using an adhesive such as PVA. Furthermore, it dries and a polarizing plate is obtained.

  Various organic solvents, inorganic salts, plasticizers, boric acids and the like may be added to the pre-swelled solution in the aqueous solution.

  As an example of the case where iodine is used as the dichroic substance, an iodine-potassium iodide aqueous solution is used as the staining liquid. Iodine is preferably 0.1 to 20 g / liter, potassium iodide is preferably 1 to 100 g / liter, and the weight ratio of iodine and potassium iodide is preferably 1 to 100. The dyeing time is preferably 30 to 5000 seconds, and the liquid temperature is preferably 5 to 50 ° C. It is also preferable to include a compound that crosslinks PVA such as a boron compound in the dyeing solution. The boron compound in the stretching bath is particularly preferably boric acid. The boric acid concentration is preferably 1 to 200 g / liter, more preferably 10 to 120 g / liter. In addition to the boron compound, the stretching bath can contain an inorganic salt such as potassium iodide, various organic solvents, or a dichroic dye. In addition to the dichroic dye, an inorganic salt such as potassium iodide, a boron compound, and the like are contained in the color adjustment bath and the curing bath as necessary.

  As a PVA stretching process, as exemplified above, it is common to apply tension in the traveling direction of the continuous film, and stretch and orient the film in the traveling direction. A method of applying tension in the width direction and orienting in the width direction is also applicable. The stretching is preferably performed 3 times or more in a uniaxial direction, and more preferably 4.5 times or more. Biaxial stretching may be performed depending on the purpose of use of the polarizing film. Although the film thickness after extending | stretching is not specifically limited, 5-100 micrometers is preferable from a viewpoint of a handleability, durability, and economical efficiency, and 10-40 micrometers is more preferable. The temperature during stretching varies depending on the stretching conditions, but is usually 10 to 250 ° C. When dry stretching at a temperature of 100 ° C. or higher, it is preferably performed in an inert gas atmosphere such as nitrogen. Further, it is preferable to perform a crystallization treatment at a temperature of 100 ° C. or higher before dyeing a previously stretched film.

  As the dyeing method, not only the immersion method exemplified above, but also any means such as application or spraying of iodine or a dye solution is possible. In addition to the liquid layer adsorption described above, adsorption by donation can be performed as necessary. It is also preferable to dye with a dichroic dye. Specific examples of dichroic dyes include, for example, dye compounds such as azo dyes, stilbene dyes, pyrazolone dyes, triphenylmethane dyes, quinoline dyes, oxazine dyes, thiazine dyes, and anthraquinone dyes. I can give you. A water-soluble one is preferred, but not limited thereto. Further, it is preferable that a hydrophilic substituent such as a sulfonic acid group, an amino group, or a hydroxyl group is introduced into these dichroic molecules.

  Typical examples of dichroic molecules include C.I. Eye. direct. Yellow 12, sea. Eye. direct. Orange 39, sea. Eye. direct. Orange 72, sea. Eye. direct. Red 28, Sea. Eye. direct. Red 39, Sea. Eye. direct. Red 79, Sea. Eye. direct. Red 81, Sea. Eye. direct. Red 83, Sea. Eye. direct. Red 89, Sea. Eye. direct. Violet 48, C.I. Eye. direct. Blue 67, Sea. Eye. direct. Blue 90, Sea. Eye. direct. Green 59, Sea. Eye. Acid. Red 37 and the like, and further, JP-A-1-161202, JP-A-1-172906, JP-A-1-172907, JP-A-1-183602, JP-A-200048105, JP-A-200065205, JP-A-7-0065. Examples thereof include dyes described in each publication of Japanese Patent No. 261024. In particular, Sea. Eye. direct. Red 28 (Congo Red) has long been known as preferred for this application. These dichroic molecules are used as free acids or alkali metal salts, ammonium salts, and salts of amines.

  By blending two or more of these dichroic molecules, it is possible to produce polarizers having various hues. As a polarizing element or polarizing plate, a compound (pigment) that exhibits black when the polarization axes are orthogonal to each other and a mixture of various dichroic molecules so as to exhibit black are excellent in terms of both single-plate transmittance and polarization rate, and are preferable.

  From the viewpoint of increasing the heat resistance and moisture resistance of the polarizing film, it is preferable to include an additive that crosslinks PVA in the manufacturing process of the polarizing film. As the crosslinking agent, those described in US Reissue Patent No. 232897 can be used, but boric acid and borax are preferably used practically. In addition, it is known that the polarizing film contains a metal salt such as zinc, cobalt, zirconium, iron, nickel, manganese, etc., because it is known to improve durability. These cross-linking agents and metal salts may be contained in any of the above-described pre-swelling bath, dichroic material dyeing bath, stretching bath, curing bath, color adjusting bath, etc., and the order of the steps is particularly limited. Not. The adhesive that bonds the protective film and the polarizing film is not particularly limited, and any known adhesive such as PVA, modified PVA, urethane, or acrylic can be used. The thickness of the adhesive layer is preferably from 0.01 to 20 μm, more preferably from 0.1 to 10 μm.

  The optical compensation sheet of the present invention (so that the support surface is in contact with the polarizing film) is bonded to one surface of the polarizing film, and a polymer film made of cellulose acylate or the like is disposed on the opposite surface. (The arrangement of optically anisotropic layer / polarizing film / polymer film) is preferred.

  The optical compensation sheet of the present invention can be used in various liquid crystal display devices. The optical compensation sheet of the present invention preferably determines the optical characteristics of the optically anisotropic layer so as to compensate for the liquid crystalline compound in the liquid crystal cell in the black display of the liquid crystal display device. Since the alignment state of the liquid crystalline compound in the liquid crystal cell in black display varies depending on the mode of the liquid crystal display device, the preferred range of the optical characteristics of the optically anisotropic layer also varies depending on the application. The alignment state of the liquid crystal compound in the liquid crystal cell is described in IDW'00, FMC7-2, P411 to 414, and the like.

As described above, the preferred range of the optical characteristics of the optical compensation sheet of the present invention varies depending on its use, for example, which mode is used for optical compensation of a liquid crystal cell. In general, Re of the optically anisotropic layer is preferably 0 to 70 nm, more preferably 20 to 70 nm, Rth is preferably 50 to 400 nm, and 100 to 400 nm. More preferred. In order to form an optically anisotropic layer exhibiting such optical characteristics, for example, when a discotic liquid crystalline compound is used and the optically anisotropic layer is formed by fixing to a hybrid alignment, a minimum inclination angle of 0 to 90 ° The hybrid orientation is preferably (more preferably 0 to 60 °) and the maximum inclination angle is 30 to 90 ° (more preferably 50 to 90 °). The Re of the transparent support is preferably from 0 to 70 nm, more preferably from 0 to 50 nm, and Rth is preferably from 10 to 400 nm, more preferably from 40 to 250 nm. However, the preferable range is an example, and the optical characteristics of the optical compensation sheet of the present invention are not limited to this range. In the present specification, Re and Rth respectively represent in-plane retardation and retardation in the thickness direction at the wavelength λ. Re is a value measured by KOBRA 21ADH (manufactured by Oji Scientific Instruments) by making light of wavelength λ nm incident in the normal direction of the film. Rth is incident on light having a wavelength of λ nm from a direction inclined by + 40 ° with respect to the film normal direction with the Re (λ) and slow axis (determined by KOBRA 21ADH) as the tilt axis (rotation axis). The retardation value measured in this way, and the retardation value measured by making light of wavelength λ nm incident from a direction inclined by −40 ° with respect to the film normal direction with the slow axis as the tilt axis (rotation axis). Based on the retardation value measured in the direction, the value is calculated by KOBRA 21ADH. Here, as the assumed value of the average refractive index, values in the polymer handbook (John Wiley & Sons, Inc.) and catalogs of various optical films can be used. Those whose average refractive index is not known can be measured with an Abbe refractometer. The average refractive index values of the main optical films are exemplified below: cellulose acylate (1.48), cycloolefin polymer (1.52), polycarbonate (1.59), polymethyl methacrylate (1.49), Polystyrene (1.59).
The KOBRA 21ADH calculates nx, ny, and nz by inputting the assumed value of the average refractive index and the film thickness.

Hereinafter, preferred embodiments of the optical compensation sheet of the present invention in the liquid crystal display device in each liquid crystal mode will be described.
(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 a rod-like liquid crystalline molecule rises at the center of the cell and the rod-like liquid crystalline compound lies in the vicinity of the cell substrate.

  The rod-like liquid crystalline compound in the center of the cell is compensated with a discotic liquid crystalline compound of the homeotropic orientation (horizontal orientation in which the disk surface is lying) or a (transparent) support, and the rod-like liquid crystalline property in the vicinity of the cell substrate The compound can be compensated with a discotic liquid crystalline compound having a hybrid alignment (an alignment in which the inclination of the major axis changes with the distance from the polarizing film). In addition, the rod-like liquid crystalline compound at the center of the cell is compensated with a rod-like liquid crystalline compound having a homogeneous orientation (horizontal orientation in which the major axis lies) or a (transparent) support, and the rod-like liquid crystalline property in the vicinity of the cell substrate The compound can be compensated with a discotic liquid crystalline compound having a hybrid alignment.

The homeotropic alignment liquid crystal compound is aligned in a state where the angle between the average alignment direction of the major axis of the liquid crystal compound and the plane of the polarizing film is 85 to 95 degrees.
The liquid crystal compound of homogeneous alignment is aligned with the angle between the average alignment direction of the major axis of the liquid crystal compound and the plane of the polarizing film being less than 5 degrees.
In the hybrid alignment liquid crystalline compound, the angle between the long axis average alignment direction of the liquid crystalline compound and the plane of the polarizing film is preferably 15 degrees or more, and more preferably 15 degrees to 85 degrees.

(Transparent) Optically anisotropic layer in which the support or discotic liquid crystalline compound is homeotropically oriented, optically anisotropic layer in which rod-like liquid crystalline compound is homogeneously oriented, or homeotropically oriented discotic The optically anisotropic layer composed of a mixture of a liquid crystal compound and a homogeneously aligned rod-like liquid crystal compound preferably has an Rth retardation value of 40 nm to 200 nm and an Re retardation value of 0 to 70 nm. As described above, in this specification, Re (λ) and Rth (λ) represent in-plane retardation and retardation in the thickness direction at wavelength λ, respectively. In the present invention, Re (λ) is a value measured using KOBRA 21ADH (manufactured by Oji Scientific Instruments) with light having a wavelength of λ nm incident in the normal direction of the film. Rth (λ) is light having a wavelength of λ nm from the direction inclined by + 40 ° with respect to the film normal direction with the Re (λ) and slow axis (determined by KOBRA 21ADH) as the tilt axis (rotation axis). And the retardation value measured by making light of wavelength λ nm incident from a direction inclined −40 ° with respect to the film normal direction with the slow axis as the tilt axis (rotation axis). A value calculated by KOBRA 21ADH based on the retardation values measured in three directions in total. Here, as the assumed value of the average refractive index, values in the polymer handbook (JOHN WILEY & SONS, INC) and catalogs of various optical films can be used. Those whose average refractive index is not known can be measured with an Abbe refractometer. The average refractive index values of the main optical films are exemplified below: cellulose acylate (1.48), cycloolefin polymer (1.52), polycarbonate (1.59), polymethyl methacrylate (1.49), Polystyrene (1.59).
KOBRA 21ADH calculates nx, ny, and nz by inputting the assumed value of the average refractive index and the film thickness.
Regarding the discotic liquid crystal compound layer having homeotropic alignment (horizontal alignment) and the rod-like liquid crystal compound layer having homogeneous alignment (horizontal alignment), Japanese Patent Laid-Open Nos. 12-304931 and 12-304932 describe them. Are listed. The discotic liquid crystal compound layer having a hybrid orientation is described in JP-A-8-50206.

(OCB mode liquid crystal display)
The OCB mode liquid crystal cell is a bend alignment mode liquid crystal cell in which a rod-like liquid crystal compound is aligned in a substantially opposite direction (symmetrically) between an upper portion and a lower portion 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 compounds 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. Therefore, this liquid crystal mode is 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 such that the rod-like liquid crystal compound rises at the center of the cell and the rod-like liquid crystal compound lies in the vicinity of the cell substrate. .

  Since the TN mode and the alignment of the liquid crystal are the same in black display, the preferred mode is the same for the TN mode. However, since the OCB mode has a larger range in which the liquid crystal compound has risen at the center of the cell than the TN mode, an optically anisotropic layer in which the discotic liquid crystal compound is homeotropically aligned or a rod-like liquid crystal It is necessary to slightly adjust the retardation value of the optically anisotropic layer in which the functional compound is homogeneously oriented. Specifically, the optically anisotropic layer in which the discotic liquid crystalline compound on the (transparent) support is homeotropically aligned, or the optically anisotropic layer in which the rod-like liquid crystalline compound is homogeneously aligned is Rth The retardation value is preferably 150 nm to 500 nm, and the Re retardation value is preferably 20 to 70 nm.

(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 following examples.
Example 1
(Production of polymer substrate)
The following composition was put into a mixing tank and stirred while heating to 30 ° C. to dissolve each component to prepare a cellulose acetate solution.
────────────────────────────────────
Cellulose acetate solution composition (parts by mass) Inner layer Outer layer ────────────────────────────────────
Cellulose acetate with an acetylation degree of 60.9% 100 100
Triphenyl phosphate (plasticizer) 7.8 7.8
Biphenyl diphenyl phosphate (plasticizer) 3.9 3.9
Methylene chloride (first solvent) 293 314
Methanol (second solvent) 71 76
1-butanol (third solvent) 1.5 1.6
Silica fine particles (AEROSIL R972, manufactured by Nippon Aerosil Co., Ltd.)
0 0.8
The following retardation increasing agent 2.20
────────────────────────────────────

  The obtained inner layer dope and outer layer dope were cast on a drum cooled to 0 ° C. using a three-layer co-casting die. The film having a residual solvent amount of 70% by mass was peeled off from the drum, both ends were fixed with a pin tenter, and the film was dried at 80 ° C. while transporting at a draw ratio of 110% in the transport direction, resulting in a residual solvent amount of 10%. By the way, it was dried at 110 ° C. Thereafter, it was dried at a temperature of 140 ° C. for 30 minutes to produce a cellulose acetate film (outer layer: 3 μm, inner layer: 74 μm, outer layer: 3 μm) having a residual solvent of 0.3% by mass. The optical properties of the produced cellulose acetate film (CF-02) were measured.

The obtained polymer substrate (PK-1) had a width of 1340 mm and a thickness of 80 μm. It was 8 nm when the retardation value (Re) in wavelength 630nm was measured using the ellipsometer (M-150, JASCO Corporation make). Moreover, it was 100 nm when the retardation value (Rth) in wavelength 630nm was measured.
The produced polymer substrate (PK-1) was immersed in a 2.0N potassium hydroxide solution (25 ° C.) for 2 minutes, neutralized with sulfuric acid, washed with pure water and dried. The surface energy of this PK-1 was determined by the contact angle method and found to be 63 mN / m.

  Next, an optically anisotropic layer was formed on the surface of the produced polymer substrate (PK-1) using a slot die coater having the same configuration as that shown in FIG. Specifically, a polymer base material (PK-1) having a resin layer for an alignment film formed on the surface is conveyed as a web 12 by a feeding machine and supported by a guide roll while being rubbed on the resin layer by a rubbing treatment roll. To obtain an alignment film. Thereafter, a coating solution for forming an optically anisotropic layer was applied to the rubbing-treated surface of the alignment film by a slot die coater 10 having the same configuration as that shown in FIG. Next, the web 12 is sequentially passed through a drying zone and a heating zone to align liquid crystal compound molecules, and then irradiated with an ultraviolet lamp to fix the alignment to form an optically anisotropic layer. A sheet was obtained.

Hereinafter, each process will be described more specifically.
An alignment film-forming coating solution having the following composition is applied to the surface of the polymer substrate (PK-1), dried with warm air at 60 ° C. for 60 seconds, and further with warm air at 90 ° C. for 150 seconds, and the alignment film A resin layer was formed.
(Orientation 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

The polymer base material (PK-1) on which the alignment layer resin layer has been formed in advance is conveyed as a web 12, and the alignment layer is formed by rubbing the surface of the alignment layer resin layer, and then transferred to the coating process as it is. The coating was carried out. The rubbing treatment was performed on the surface of the alignment film resin layer in a direction parallel to the slow axis (measured at a wavelength of 632.8 nm) of the polymer substrate (PK-1). The rotational peripheral speed of the rubbing roller in the rubbing treatment was 5.0 m / sec, and the pressing pressure against the alignment layer resin layer was set to 9.8 × 10 ⁻³ Pa.

Next, while the web 12 made of the polymer substrate (PK-1) on which the alignment film is formed is conveyed, the coating liquid 14 for forming an optical anisotropic layer having the following composition is applied to the rubbing surface of the alignment film by the slot die 13. The film was applied at 5 ml / m ² so that the wet film thickness was 5 μm. The coating speed was 60 m / min. In addition, the decompression chamber was installed in the position which does not contact on the opposite side to the advancing direction side of the web 12 so that sufficient decompression adjustment with respect to the bead 14a can be performed. The upstream lip land length IUP of the slot die 13 was 1 mm, and the downstream lip land length ILO was 50 μm. Using this slot die 13, the coating solution 14 was applied on the web 12 at 5 ml / m ² so that the wet film thickness was 5 μm. The coating speed was 60 m / min. The length of the gap between the downstream lip land 19 and the web 12 was set to 40 μm.

(Preparation of coating solution for optically anisotropic layer)
The following composition was dissolved in 102 kg of methyl ethyl ketone to prepare a coating solution.
The following discotic liquid crystalline compound (1) 41.01 parts by mass Ethylene oxide-modified trimethylolpropane triacrylate (V # 360, manufactured by Osaka Organic Chemical Co., Ltd.) 4.06 parts by mass Exemplified compound of general formula (1) ( II-1) 0.09 parts by mass Cellulose acetate butyrate (CAB551-0.2, manufactured by Eastman Chemical Co., Ltd.) 0.08 parts by mass Fluoroaliphatic group-containing polymer exemplified compound (P-72) 0.18 parts by mass Polymerization initiator (Irgacure 907, manufactured by Ciba Geigy) 1.35 parts by mass Sensitizer (Kayacure DETX, manufactured by Nippon Kayaku Co., Ltd.) 0.45 parts by mass

  The web 12 coated with the coating solution 14 is passed through a drying zone set at 100 ° C. and a heating zone set at 130 ° C., and ultraviolet rays are irradiated on the surface of the liquid crystal layer by a 120 W / cm UV lamp in an atmosphere at 60 ° C. Irradiated to produce an optical compensation sheet (KH-1). The applicability was judged by visual observation of the bead state, and the application was impossible when the bead 14a was broken. As a result, in Example 1, application was possible, and the degree of vacuum at this time was 1000 Pa.

  The Re retardation value of the optically anisotropic layer measured at a wavelength of 546 nm was 50 nm. Moreover, when the polarizing plate was made into a crossed Nicol arrangement and the unevenness of the obtained optical compensation sheet (KH-1) was observed, the unevenness was not detected even when viewed from the front and the direction inclined to 60 degrees from the normal. It was.

(Evaluation of tilt angle of liquid crystal compounds)
The retardation of the liquid crystal compound in the optically anisotropic layer near the alignment film and the air interface near the air interface is changed by changing the observation angle using an ellipsometer (APE-100, manufactured by Shimadzu Corporation). Jpn. J. et al. Appl. Phys. Vol. 36 (1997) p. It calculated by the method described in 143-147. The measurement wavelength was 632.8 nm. The results are shown in Table 1. The inclination angles were similarly determined for Examples 2 to 7 and Comparative Examples 1 to 3 shown below.

(Preparation of polarizing plate)
Using a polyvinyl alcohol-based adhesive, the optical compensation sheet KH-1 produced as described above was attached to one surface of a polarizer (HF-1). In addition, saponification treatment was performed on a 80 μm thick triacetyl cellulose film (TD-80U: manufactured by Fuji Photo Film Co., Ltd.), and the surface opposite to the polarizer (HF-1) using a polyvinyl alcohol-based adhesive. Pasted on.
The transmission axis of the polarizer (HF-1) and the slow axis of the polymer film (PK-1) that is the support of the optical compensation sheet were arranged in parallel. The transmission axis of the polarizer (HF-1) 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)
In preparation of the coating liquid for optically anisotropic layer formation, except having added exemplary compound (II-2) of general formula (1) instead of exemplary compound (II-1) of general formula (1). In the same manner as in Example 1, an optical compensation sheet (KH-2) and a polarizing plate with KH-2 (HB-2) were produced. The Re retardation value of the optically anisotropic layer in the optical compensation sheet measured at a wavelength of 546 nm was 48 nm. Moreover, when the polarizing plate was arranged in a crossed Nicol arrangement and the unevenness of the obtained optical compensation sheet was observed, no unevenness was detected even when viewed from the front and the direction inclined by 60 degrees from the normal line.

(Example 3)
In the preparation of the coating liquid for forming the optically anisotropic layer, except that the exemplified compound (II-3) of the general formula (1) was added instead of the exemplified compound (II-1) of the general formula (1), In the same manner as in Example 1, an optical compensation sheet (KH-3) and a polarizing plate with KH-3 (HB-3) were produced. The Re retardation value of the optically anisotropic layer in the optical compensation sheet measured at a wavelength of 546 nm was 48 nm. Moreover, when the polarizing plate was arranged in a crossed Nicol arrangement and the unevenness of the obtained optical compensation sheet was observed, no unevenness was detected even when viewed from the front and the direction inclined by 60 degrees from the normal line.

Example 4
In the preparation of the coating liquid for forming the optically anisotropic layer, the same procedure as in Example 1 was conducted except that P-11 was added instead of the exemplified compound (P-72) of the fluoroaliphatic group-containing polymer. A compensation sheet (KH-4) and a polarizing plate with KH-4 (HB-4) were produced. The Re retardation value of the optically anisotropic layer in the optical compensation sheet measured at a wavelength of 546 nm was 50 nm. Moreover, when the polarizing plate was arranged in a crossed Nicol arrangement and the unevenness of the obtained optical compensation sheet was observed, no unevenness was detected even when viewed from the front and the direction inclined by 60 degrees from the normal line.

(Example 5)
In the preparation of the coating liquid for forming the optically anisotropic layer, cellulose acetate butyrate (CAB531-1, manufactured by Eastman Chemical) was used instead of cellulose acetate butyrate (CAB551-0.2, manufactured by Eastman Chemical). An optical compensation sheet (KH-5) and a polarizing plate with KH-5 (HB-5) were produced in the same manner as in Example 4 except that the above was added. The Re retardation value of the optically anisotropic layer in the optical compensation sheet measured at a wavelength of 546 nm was 45 nm. Moreover, when the polarizing plate was arranged in a crossed Nicol arrangement and the unevenness of the obtained optical compensation sheet was observed, no unevenness was detected even when viewed from the front and the direction inclined by 60 degrees from the normal line.

(Example 6)
In preparation of a coating solution for forming an optically anisotropic layer, an exemplary compound (H-15) having a 1,3,5-triazine ring group was added, and a constant temperature zone at 120 ° C. during the formation of the optically anisotropic layer An optical compensation sheet (KH-6) and a polarizing plate with KH-6 (HB-6) were produced in the same manner as in Example 1 except that the heating in was changed from 2 minutes to 1 minute. The Re retardation value of the optically anisotropic layer in the optical compensation sheet measured at a wavelength of 546 nm was 40 nm. Moreover, when the polarizing plate was arranged in a crossed Nicol arrangement and the unevenness of the obtained optical compensation sheet was observed, no unevenness was detected even when viewed from the front and the direction inclined by 60 degrees from the normal line.

(Example 7)
In preparation of a coating solution for forming an optically anisotropic layer, an exemplary compound (H-16) having a 1,3,5-triazine ring group was added, and a constant temperature zone at 120 ° C. during the formation of the optically anisotropic layer An optical compensation sheet (KH-7) and a polarizing plate with KH-7 (HB-7) were produced in the same manner as in Example 1 except that the heating in was changed from 2 minutes to 1 minute. The Re retardation value of the optically anisotropic layer in the optical compensation sheet measured at a wavelength of 546 nm was 42 nm. Moreover, when the polarizing plate was arranged in a crossed Nicol arrangement and the unevenness of the obtained optical compensation sheet was observed, no unevenness was detected even when viewed from the front and the direction inclined by 60 degrees from the normal line.
(Example 8)
In the preparation of the coating liquid for forming the optically anisotropic layer, an optical compensation sheet (as in Example 2) was used except that cellulose acetate butyrate (CAB551-0.2, manufactured by Eastman Chemical Co., Ltd.) was not added. KH-8), and further a polarizing plate with KH-8 (HB-8) was produced. The Re retardation value of the optically anisotropic layer in the optical compensation sheet measured at a wavelength of 546 nm was 40 nm.

Example 9
As for the coating method of the coating liquid for forming the optically anisotropic layer, the optical compensation sheet, and further, in the same manner as in Example 1, except that the coating speed was 20, 40, 80, 100, and 120 m / min. A polarizing plate with an optical compensation sheet was prepared. When the polarizing plate is arranged in a crossed Nicol arrangement and the unevenness of the obtained optical compensation sheet is observed, no unevenness is detected in any of the optical compensation sheets even when viewed from the front and the direction inclined to 60 degrees from the normal. It was.

(Comparative Example 1)
An optical compensation sheet (KH-H1) was prepared in the same manner as in Example 1 except that the exemplified compound (II-2) of the general formula (1) was not added in the preparation of the coating liquid for forming an optically anisotropic layer. Furthermore, a polarizing plate (HB-H1) with KH-H1 was produced. The Re retardation value of the optically anisotropic layer in the optical compensation sheet measured at a wavelength of 546 nm was 28 nm.
(Comparative Example 2)
Regarding the application of the coating liquid for forming the optically anisotropic layer, the optical compensation sheet (KH-H2), and further the KH, in the same manner as in Example 1, except that it was continuously applied with a # 3.6 wire bar. A polarizing plate with -H2 (HB-H2) was produced. The Re retardation value of the optically anisotropic layer in the optical compensation sheet measured at a wavelength of 546 nm was 50 nm. Further, when the polarizing plate was arranged in a crossed Nicol arrangement and the unevenness of the obtained optical compensation sheet was observed, streaky unevenness was detected when viewed from the front and a direction inclined by 60 degrees from the normal.

(Reference Example 1)
An optical compensation sheet was produced in the same manner as in Example 6 except that the heating and aging method of the optically anisotropic layer was heated in a constant temperature zone of 80 ° C. for 1 minute.

(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 viewer side and the transmission axis of the polarizing plate on the backlight side were arranged 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.

  As can be seen from the results shown in Table 1, the optically anisotropic layer containing the compound represented by the general formula (1) is compared with the optically anisotropic layer not containing this (Comparative Example 1). The inclination angle at the air interface was large, and in particular, the optically anisotropic layers (Examples 1 to 7) containing cellulose ester had a larger inclination angle at the air interface. In the optically anisotropic layer containing the compound represented by the general formula (1), the tilt angle at the air interface of the liquid crystalline compound is controlled to an optimum value, so that the optical compensation having the optically anisotropic layer is provided. The sheet greatly contributes to the expansion of the viewing angle of the liquid crystal display device. Further, from comparison between Examples 6 and 7 and Reference Example 1, the optically anisotropic layer formed a horizontal alignment in the low temperature region (80 ° C. constant temperature zone) and then hybrid alignment in the high temperature region (120 ° C. constant temperature zone). It can be seen that Furthermore, from the results of Comparative Example 2 coated with a wire bar and Examples 1 to 9 coated with a slot die coater, it was confirmed that coating with a slot die coater did not detect unevenness, resulting in a liquid crystal display device with high display quality. did.

(Example 10)
Optical compensation was performed in the same manner as in Example 1 except that the polymer base material having Rth of 80, 90, 110, 120, and 130 nm was prepared by changing the amount of the retardation increasing agent used in Example 1. Sheets and further polarizing plates with optical compensation sheets were prepared. Even when the Rth of the polymer substrate was changed to 80, 90, 110, 120, and 130 nm, it was confirmed that the vertical, horizontal, and horizontal viewing angles were almost the same as the viewing angles obtained in Example 1.

(Example 11)
Example 1 except that the retardation increasing agent used in Example 1 was replaced with the following retardation increasing agent, and the addition amount of the inner layer was 1.4 parts by mass, and a polymer substrate having an Rth of 110 nm was prepared. In the same manner as described above, an optical compensation sheet and a polarizing plate with an optical compensation sheet were produced. It was confirmed that the vertical and horizontal viewing angles were almost the same as the viewing angles obtained in Example 1.

(Example 12)
Optical compensation was performed in the same manner as in Example 1 except that the polymer base material having Rth of 80, 90, 100, 120, and 130 nm was prepared by changing the amount of the retardation increasing agent used in Example 11. Sheets and further polarizing plates with optical compensation sheets were prepared. Even when the Rth of the polymer substrate was changed to 80, 90, 100, 120, and 130 nm, it was confirmed that the viewing angles of the top, bottom, left, and right were almost the same as the viewing angles obtained in Example 1.

It is a cross-sectional schematic diagram of an example of the slot die coater which can be used for production of the optical compensation sheet of the present invention. It is a cross-sectional schematic diagram of an example of a slot die that can be used for the production of the optical compensation sheet of the present invention. It is explanatory drawing of a differential pressure | voltage and a bead in the slot die front-end | tip part which implemented this invention.

Claims (10)

An optical compensation sheet having an optically anisotropic layer formed by applying a composition containing at least one liquid crystal compound and at least one compound represented by the following general formula (1) by a die coater:
General formula (1)
(Rf-X-) _m Ar (-W) _n
In formula (1), Ar represents an (m + n) -valent aromatic heterocyclic group or aromatic hydrocarbon ring group, X represents a single bond or a divalent linking group, and Rf is substituted with an alkyl group or a fluorine atom. W represents a sulfo group or a carboxyl group, m represents an integer of 1 to 4, and n represents 1 or 2. When m represents an integer of 2 or more, a plurality of Rf and X may be the same or different. The optical compensation sheet according to claim 1, wherein the composition further contains at least one fluoroaliphatic group-containing polymer. The optical compensation sheet according to claim 1 or 2, wherein the composition further contains at least one compound having a 1,3,5-triazine ring group. The optical compensation sheet according to any one of claims 1 to 3, wherein the composition further contains at least one cellulose ester. 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 in the optically anisotropic layer, molecules of the liquid crystalline compound are hybrid-aligned and the hybrid alignment is fixed. A composition containing at least one liquid crystal compound and at least one compound represented by formula (1) according to claim 1 is applied by a die coater, and the molecules of the liquid crystal compound are Horizontally aligning in the presence of the compound represented by the general formula (1);
Hybrid aligning molecules of the horizontally aligned liquid crystalline compound;
Fixing the liquid crystalline compound in the hybrid alignment state to form an optically anisotropic layer;
A method for producing an optical compensation sheet comprising:   A polarizing plate comprising at least a polarizing film and a transparent protective film on at least one surface of the polarizing film, wherein the transparent protective film is the optical compensation sheet according to claim 1. A liquid crystal display device comprising the optical compensation sheet according to claim 1.   7. The liquid crystal cell according to claim 1, further comprising a liquid crystal cell and a pair of polarizing films respectively disposed on both sides of the liquid crystal cell, wherein the liquid crystal cell is disposed between at least one of the pair of polarizing films and the liquid crystal cell. The liquid crystal display device according to claim 9, comprising the optical compensation sheet.

Images