TW200922979A - Method for manufacturing optical compensation film, and optical compensation film, polarizing plate, liquid crystal display device - Google Patents

Abstract

To provide a method for manufacturing high-quality optical compensation film, in which dust producing of oriented film can be effectively suppressed, and which is suitable for liquid crystal display apparatus, and also optical compensation film manufactured by the method, and the polarizing plate using the same, further to obtain the liquid crystal display apparatus. The coating solution including at least a polymer and a hardening compound to harden said polymer in a solvent with organic solvent property is coated on a traveling web 1a by a coating machine 5 to form a coating film, drying and hardening the coating film by a drying apparatus 6, and oriented film which has crystallinity measured by the ATR/IR method in the range of 0.2 to 0.8 is formed, and an oriented film is processed by rubbing the oriented film with a rubbing apparatus 8 in the range of 300 to 800 Nm/m<SP>2</SP> in work quantity, further, a coating solution containing liquid crystalline discotic compound is coated on an oriented film having been rub-processed by a coating machine 10, is heated with heating zone 11 and irradiated ultraviolet light with ultraviolet irradiation lamp 12, to form a liquid crystal layer, thereby producing optical compensation film.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an optical compensation film and an optical compensation film, particularly an optical compensation film for improving surface properties, a method for producing an optical compensation film, and the use of the optical compensation. A polarizing plate for a film or a liquid crystal display device. [Prior Art] A liquid crystal display device is generally composed of a liquid crystal cell, a polarizing plate, and an optical compensation film (phase difference plate), and is mainly classified into a transmissive liquid crystal display device and a reflective liquid crystal display device. In a transmissive liquid crystal display device, two polarizing plates are mounted on both sides of a liquid crystal cell, and one or two optical compensation films are disposed between the liquid crystal cell and the polarizing plate. The reflective liquid crystal display device is disposed in the order of a reflector, a liquid crystal cell, an optical compensation film, and then a single polarizing plate. The liquid crystal cell is usually formed of a rod-like liquid crystal molecule, a two-layer substrate for the molecule, and an electrode layer for applying a voltage to the rod-like liquid crystal portion. In the liquid crystal cell, various display modes have been proposed due to the difference in the alignment state of the rod-like liquid crystal molecules, and in terms of the transmission type, there are TN (twisted nematic), IPS (in-plane switching), and FLC (ferroelectric liquid crystal type). ), 〇CB (optical compensation bending), STN (super-twisted nematic), VA (vertical alignment), etc., and the reflection type, there are proposals HAN (mixed arrangement nematic). The polarizing plate ' is generally formed of a polarizing film and a transparent protective film. The polarizing film is generally obtained by immersing an aqueous solution of iodine or a dichroic dye in polyvinyl alcohol and further stretching the film by one axis. The polarizing plate has a configuration in which two transparent protective films are attached to both sides of the polarizing film. 200922979 Optical compensation film uses various liquid crystal display devices to eliminate image coloration or to increase the viewing angle. In the case of an optical compensation film, it has been proposed to use an optical compensation film having an optically anisotropic layer formed of a liquid crystal molecule (especially a discotic liquid crystal molecule) on a transparent support. The optically anisotropic layer is formed by aligning liquid crystal molecules and fixing their alignment state. In general, a liquid crystalline molecule having a polymerizable group is used, and the alignment state is fixed by a polymerization reaction. The liquid crystalline molecules have a large birefringence. Next, in the liquid crystalline molecules, there are various alignment forms. The liquid crystal molecules are used, and the optical properties which are not obtained by the conventional stretched birefringent film can be realized. The optical properties of the optical compensation film can be determined according to the optical properties of the liquid crystal cell, specifically, according to the difference in the above display modes. In the liquid crystal molecules of the optical compensation film, particularly when discotic liquid crystal molecules are used, an optical compensation film having various optical properties which can correspond to various display modes of the liquid crystal cell can be manufactured. There are also proposals for optical compensation films using discotic liquid crystal molecules in accordance with various display modes. In the case where an optical compensation film of an optically anisotropic layer in which alignment of liquid crystal molecules is fixed is provided on a transparent support, an alignment film is provided between the transparent support and the optically anisotropic layer. In this case, the adhesion between the transparent support (usually a deuterated cellulose film) and the alignment film is necessary. Further, the alignment of the alignment film can be performed by a treatment such as honing, electric field addition, magnetic field addition, or light irradiation, but the adhesion of fine dust or the like on the alignment film may impair the uniformity of alignment. In particular, in the honing treatment, the surface of the film may be rubbed. 200922979 The surface of the film may be adhered to the dust formed on the alignment film by dust generated from the alignment film forming material. Further, in the honing treatment, the alignment film is wiped with a honing cloth to cause static electricity, and the adhesion between the dust and the alignment film may increase. Therefore, we seek to cause dust generation due to honing treatment and electrostatic gas to be effectively removed. In the method of solving the problem caused by the honing treatment of the optical compensation film, Patent Document 1 discloses a method of removing static electricity generated by irradiation of a soft X-ray to remove dust by a dust remover. According to Patent Document 2, by moving the dust remover in the width direction, the wind speed of the compressed air from the dust remover can be made constant in the width direction, and the dust unevenness or the damage of the honing film can be reduced. Patent Document 3 discloses that the dust of the pile yarn adhering to the honing cloth used for the honing treatment is removed by the setting of the cleaning machine wheel of the honing cloth, and the method of reducing the reattachment of the alignment film is reduced. . Further, Patent Document 4 discloses a method of suppressing generation of static electricity by selecting a material in which the honing cloth material has the same honing work function as the alignment film. [Patent Document 1] Japanese Laid-Open Patent Publication No. Hei 11-305233 (Patent Document 2) ! _ 3 i ! 7 8 7 7 7 7 7 7 7 7 7 7 7 7 7 2001 2001 2001 2001 2001 2001 2001 2001 2001 2001 2001 2001 2001 2001 2001 2001 2001 2001 2001 2001 2001 2001 2001 2001 2001 2001 2001 2001 2001 2001 2001 2001 2001 2001 2001 2001 2001 2001 2001 2001 2001 2001 2001 2001 However, 'the high brightness of the liquid crystal display device, the quality of the display quality', the quality of the optical compensation film used by the device is improved (bright spot defect 'uneven failure). Further, in recent years, it is suitable for high brightness of TV applications, and 200922979 is expected to be compatible with an optical compensation film of a large-screen liquid crystal display device. Further, it is desirable to provide a liquid crystal display device having a high display quality in which a polarizing plate having an optical compensation film disposed on one side of the polarizing film is provided. However, the technique of applying the conventional patent document does not sufficiently satisfy the requirements for improving the quality of dust removal and static elimination during the honing treatment. In addition, equipment investment in capacity improvement, equipment configuration space is necessary. The present invention has been made in view of such circumstances, and an object thereof is to effectively suppress the occurrence of dust in an alignment film, to be a liquid crystal display device, to manufacture a high-grade optical compensation film, and to manufacture the same. The optical compensation film 'and the polarizing plate used for the optical compensation film are used to obtain a liquid crystal display device. Means for Solving the Problem In order to achieve the object, a method for producing an optical compensation film of the present invention comprises (a) a supporting member which is in progress, and is coated with at least a polymer and a curing compound which hardens the polymer, and is contained in an organic solvent. a coating liquid of the solvent to form a coating film, and (b) drying and curing the coating film to form a drying and hardening step of the alignment film having a degree of crystallization of 0.2 to 0.8 as measured by the ATR/IR method. c) a step of subjecting the alignment film to a honing treatment at a work load of 300 to 800 Nm/m 2 , and (d) a step of forming a liquid crystal layer on the alignment film subjected to the honing treatment. In order to achieve the above object, the inventors first found out that (1) the alignment film formed by the AT R /IR method has a degree of crystallization of 〇·2~0 · 8 200922979 '(2) The alignment film is honed by a workload of 300 to 80 〇Nm/m2, and it is found that the amount of dust generation can be suppressed, the bright spot defects can be reduced, and the alignment regulation force of the alignment film can be improved. In the method for producing an optical compensation film of the present invention, the drying and curing step includes a second step of performing a constant rate of drying and a second step of decelerating and drying, and the second step The maximum film surface temperature of the coating film is 25 t to 135 ° C. The inventors first found that the maximum film surface temperature of the coating film is controlled in the second step, and the degree of crystallization of the alignment film can be controlled. The film surface temperature is in the range of 25 ° C to 1 3 5 ° C, and the degree of crystallization is obtained. 2 to 〇 · 8 of the alignment film ό The method for producing the optical compensation film of the present invention is in the invention, In the second step, the solid content concentration in the coating film is 80% or more. The position of the drying step of the second step and the second step, that is, the position at which the maximum film surface temperature is determined, and the solid in the coating film are defined. The point where the component concentration is 80% or more is the measurement point of the maximum film surface temperature. When the solid content concentration in the coating film is 80% or more, it is considered that the film can be transferred to deceleration and drying. The method for producing the optical compensation film of the present invention is The hair In the case where the curing compound contains at least one monomer having two or more crosslinkable reactive groups, the curing compound contains at least a monomer having two or more crosslinking reactive groups. Therefore, an optical compensation film in which adhesion and good surface properties are stored can be produced. The method for producing an optical compensation film of the present invention is characterized in that the support has a retardation 値 (Re値) of 0 to 200 nm. The support can be preferably used as an optical compensation film for a liquid crystal display device by blocking the -10-200922979 support in the above range. The method for producing an optical compensation film of the present invention is based on the invention. The polymer contains a composition for forming an alignment film of polyvinyl alcohol and/or modified polyvinyl alcohol as a main component. The polymer is mainly composed of polyethyl alcohol and/or modified polyvinyl alcohol. Therefore, the bonding strength of the liquid crystal compound laminated on the alignment film forming layer can be appropriately maintained. The method for producing an optical compensation film of the present invention is the monomer having the two or more crosslinking reactive groups. system The aldehyde compound having two or more aldehyde groups is characterized in that the monomer having two or more crosslinking reactive groups has an aldehyde compound having two or more aldehyde groups, so that the adhesion between the support and the coating film can be improved. To achieve the object, the optical compensation film of the present invention can be produced by the above-described manufacturing method. To achieve the object, the polarizing plate of the present invention contains the optical compensation film. To achieve the object, the liquid crystal display device of the present invention contains the optical compensation device. The optical compensation film produced by the manufacturing method of the present invention, a polarizing plate containing the optical compensation film, and a liquid crystal display device including the polarizing plate. The optical compensation film of the present invention can suppress dust generation. As a result, the quality can be improved (bright spot defects, uneven failure), so that it can be suitably applied to the above applications. EFFECTS OF THE INVENTION According to the present invention, the degree of crystallization of the alignment film is in the range of 0.2 to 0.8, and the honing work amount with respect to the alignment film is in the range of 300 to 800 Nm/m 2 200922979, and dust generation can be effectively suppressed. As a result, it is possible to provide a method for producing an optical compensation film which is preferable for a high-quality liquid crystal display device, an optical compensation film manufactured by the method of manufacturing the same, and a polarizing plate using the optical compensation film, which is further provided A liquid crystal display device. [Embodiment] Hereinafter, a method for producing an optical compensation film of the present invention, an optical compensation film produced by the production method, a polarizing plate using the optical compensation film, and a liquid crystal display device in which the polarizing plate is disposed will be described in detail. The present invention has been described in the following preferred embodiments, but may be modified in various ways without departing from the scope of the invention, and other embodiments than the embodiments of the present invention can be utilized. Therefore, all modifications within the scope of the invention are also included in the scope of the patent application. The numerical range indicated by the use of "~" in the present specification means the range including the number "値" described before and after "~_. First, the optical compensation film and the method for producing the same will be described. The optical compensation film of the present invention has a predetermined The support for the adhesion treatment, the alignment film, and the optical anisotropy (also referred to as "optical anisotropic layer") are formed by laminating layers in this order. [Support] The support of the present invention is preferably a glass or a transparent polymer film. It is preferable that the support has a light transmittance of 80% or more. Examples of the polymer constituting the polymer film may, for example, be a cellulose ester (for example, a mono- to tri-deuterate of cellulose) or a norb〇rnene-based polymer, and may be Ar to η. And Ze on ex (all trade names)). Further, in the conventional polycarbonate or the polymer of -12-200922979, which is easy to exhibit birefringence, it can be controlled by modifying the molecule as described in the handbook of International Publication No. 0 0 / 2 6 7 5 5 When the refraction is developed, it can be used in the optical compensation film of the present invention. In the case of the polymer film used in the present invention, a cellulose ester film is preferred, and a cellulose acetate film is preferred. Further, in the present invention, the thickness of the support is preferably from 20 to 500 / zm, more preferably from 40 to 200 μm, and most preferably from 30 to 80 #ηη. In the present specification, 'Re(A)' Rth(A) each means that the wavelength is retarded in the in-plane retardation and the thickness direction. In the KOBRA 21ADH (manufactured by Oji Scientific Instruments Co., Ltd.), Re (A) was measured by causing light having a wavelength of Λ nm to be incident on the normal direction of the film.

Rth( λ ) is such that the Re( Λ ), the in-plane retardation axis (determined by KOBRA 2 1ADH) is used as the tilt axis (rotation axis) with respect to the film normal direction from the direction of inclination +40° to make the wavelength λ nm The retardation measured by the incidence of light, and the in-plane slow axis as the tilt axis (rotation axis) is inclined by -4 with respect to the normal direction of the film (the direction of T is such that the light of the wavelength λ nm is incident and the retardation is measured. The KOBRA 2 1 AD Η is calculated based on the retardation measured in three directions. In this assumption of the average refractive index, the polymer manual (JOHN WILEY &amp; SONS), the catalogue of various optical films can be used. As the average refractive index is not known, it can be measured by an Abbe refractometer. The average refractive index of the main optical film is shown below: deuterated cellulose Π 48) 'cycloolefin polymer (1.52), poly Carbonate (1.59), polymethyl propylene methyl ester (1.49), polystyrene (1.59). The assumption of the average refractive index and the film thickness are input, and KOBRA 2 1ADH can calculate the retardation system of the nx, ny, -13-200922979 polymer film, the liquid crystal display device used for the optical compensation film, or the method of using the same The preferred range varies, and Re値 is usually a transparent support of 0 to 200 nm. In order to adjust Re 値 of the polymer film; a method of imparting a force other than stretching is general, and in other methods, a retardation agent for adjusting the optical anisotropy may be added as it is. The deuterated cellulose used in the present invention may be cotton linter, kenaf, wood pulp (broadwood pulp, conifer pulp), or the like, or cellulose obtained from any of the raw materials, may be used. It can also be mixed and used depending on the situation. Further, in the present invention, cellulose can be produced by esterification of cellulose, and the cellulose which is particularly preferable is not used as it is, but cotton linter, kenaf, and pulp can be used for purification. In the present invention, "deuterated cellulose" means a carboxylate of cellulose. The total carbon number of the carboxylic acid is preferably 2 to 2 2 . Further, the cellulose of the present invention preferably has a degree of substitution with respect to cellulose which satisfies the following formulas (1) and (2). Formula (1) : 2 · 3 g SA, +SB, $ 3 · 0 Equation (2) : 〇芸SA, 芸3.0 Here, 'SA' indicates the substitution of an acetamyl group replacing the hydrogen atom of the hydroxyl group of cellulose. The degree 'also SB' indicates the degree of substitution of the thiol group having a carbon atom number of 3 to 22 in place of the hydrogen atom of the hydroxyl group of the cellulose. Further, SA represents an ethylenic group SB which substitutes a hydrogen atom of a hydroxyl group of cellulose, and represents a brewing group having a carbon atom number of 3 to 22 which replaces a hydrogen atom of a hydroxyl group of cellulose. The glucose unit that constitutes the cellulose has a free hydroxyl group at the 2, 3, and 6 positions. Deuterated cellulose is a polymer (polymer) in which a part or all of the hydroxyl groups are esterified. The thiol substitution -14- 200922979 degree means the ratio of cellulose esterification (100% of each position to the degree of substitution 1) for each of the 2, 3 and 6 positions. In the present invention, the sum of SA and SB substitution degrees (SA' + SB') is preferably 2.6 to 3.0, particularly preferably 2.80 to 3.00. Further, the degree of substitution (SB') of SB is preferably from 0 to 1.2, particularly preferably from 0 to 0.8. The fluorenyl group (SB) having 3 to 22 carbon atoms of the deuterated cellulose used in the present invention may be an aliphatic group or an aryl group, and is not particularly limited. These may, for example, be an alkyl carbonyl ester, an alkene carbonyl ester, a cycloalkane carbonyl ester, an aromatic carbonyl ester or an aromatic alkyl carbonyl ester of cellulose, and may each have a substituted group. For these more suitable SB aspects, there are propyl, butyl, pentylene, hexyl, octyl, sulfhydryl, fluorenyl, thirteenth fluorenyl: tetradecyl, hexadecanyl, ten An octadecyl group, a cyclohexanecarbonyl group, an oil sulfhydryl group, a (meth)acryl fluorenyl group, a phenylethyl fluorenyl group, a benzoinyl group, a naphthylcarbonyl group, a cinnamyl group, and the like. Among these, preferred SB is propyl fluorenyl, butyl fluorenyl, pentyl fluorenyl, hexyl fluorenyl, cyclohexanecarbonyl, fluorenyl, octadecyl, oleyl, (meth) acryl fluorenyl, Benzoyl, naphthalenecarbonyl, cinnamyl and the like. The lower fatty acid ester of cellulose is more preferred. The lower fatty acid means a fatty acid having 6 or less carbon atoms. The number of carbon atoms is preferably 2 (cellulose acetate), 3 (cellulose propionate) or 4 (cellulose butyrate). The cellulose ester is preferably cellulose acetate, and examples thereof include diethylhydrazine cellulose and triethylenesulfinyl cellulose. It is also preferred to use a mixture of fatty acid esters such as cellulose acetate propionate or cellulose acetate butyrate. -15- 200922979 These specific sulfhydryl groups, and the synthesis method of bismuth cellulose, were published in the Japan Invention Association Open Technical Bulletin No. 2001- 1745 (March 1, 2005), Japan Invention Association ) Page 9 is well documented. In cellulose acetate, the hydroxyl groups at the 2, 3, and 6 positions of cellulose are not uniformly substituted, and the degree of substitution of 6 places tends to be small. In the cellulose acetate used in the present invention, the degree of substitution at the 6-position of cellulose is preferably the same or more in comparison with the 2-position and the 3-position. The ratio of the degree of substitution of 6 is preferably from 30 to 40%, and the ratio of from 3 to 40% is better than the total of substitutions of two, three, and six, and from 3 to 40%. The best. The degree of substitution of 6 bits is preferably 0.88 or more. The cellulose sulphate thin film is preferably one having a polymer component constituting the film substantially having the above-defined definition of cellulose. "Substantially" means that the total polymer component (specifically, a polymer component other than the particles described later) is 55 wt% or more (preferably 70 wt% or more, more preferably 80 wt% or more). The polymerization degree of the deuterated cellulose has a viscosity average polymerization degree of 200 to 700, preferably 230 to 550, more preferably 23 to 350, and particularly preferably a viscosity average polymerization of 240 to 320. The average degree of polymerization can be determined by the limit viscosity method of Uda et al. (Uda Kazuo, Saito Hideo, Fiber Society, Vol. 18, No. 1, pp. 105-1200, 196). Further, it is described in detail in Japanese Laid-Open Patent Publication No. Hei 9-95538. Further, the molecular weight distribution of the deuterated cellulose which can be preferably used in the present invention can be evaluated by gel permeation chromatography, and the polydispersity index Mw/Mn (Mw weight average molecular weight, Μη coefficient amount average molecular weight) -16 - 200922979 Small 'molecular weight distribution is better for the narrower. For the specific Mw/Mn値, it is preferably 1.0 to 5.0, preferably 1.0 to 3, and preferably 1 to 2. The raw material of the deuterated cellulose or the synthetic method thereof is described in detail in the art No. 2001-1745, pages 7-12. When the retardation enhancer is used as described above, the retardation in the thickness direction of the support can be made high. In the case of retarding the rising agent, a compound having at least two aromatic rings and a conjugation of the two aromatic rings having a non-stereoscopic molecular structure can be used. The aromatic compound is used in an amount of 0.01 to 20 parts by weight based on 100 parts by weight of the deuterated cellulose. The aromatic compound is preferably used in an amount of from 0.05 to 15 parts by weight, more preferably from 0.1 to 1 part by weight, based on 100 parts by weight of the deuterated cellulose. It is also possible to use two or more aromatic compounds. The aromatic ring of the aromatic compound contains an aromatic heterocyclic ring in addition to the aromatic hydrocarbon ring. Examples of the retardation-increasing agent include, for example, the European Patent No. 0 9 1 1 6 5 6 A 2, and the compounds described in JP-A-2000-11714, and the like. In the deuterated cellulose film of the present invention, it is preferred to add fine particles in order to maintain good scratch resistance or film handling property. These, known as matting agents, anti-caking agents or anti-breaking agents, are widely used. The materials which can exhibit the aforementioned functions are not particularly limited, and the specific examples of the matting agents are 'inorganic compounds', which are compounds containing cerium, cerium oxide, titanium oxide, zinc oxide, aluminum oxide, Yttrium oxide, -17- 200922979 Zirconium oxide, cerium oxide, cerium oxide, tin oxide, tin oxide, antimony, calcium carbonate, talc, clay, calcined kaolin, calcined calcium citrate, calcium citrate, aluminum citrate, Magnesium citrate and calcium phosphate are preferred, and more preferably an inorganic compound containing cerium or cerium oxide, and the turbidity of the fluorinated cellulose film can be reduced. Further, the surface-treated inorganic fine particles are also excellent in dispersibility in deuterated cellulose. For the treatment method, for example, the method described in JP-A-54-57562 can be mentioned. Examples of the particles include those described in JP-A No. 2000-51. As the organic compound, a polymer such as crosslinked polystyrene, polyoxyxylene resin, fluororesin or acrylic resin is preferred, and a polyoxyxylene resin is preferably used. Among the polyoxyxylene resins, those having a three-dimensional network structure are preferred. The deuterated cellulose film of the present invention may be added with a plasticizer in order to improve mechanical properties or to increase the drying speed. As the plasticizer, a phosphate or a carboxylate can be used. Specifically, it is preferable to use the content described in detail on page 16 of the Open Disclosure of the Invention Association (public technology No. 2001-1745, issued by the Japan Invention Association on March 15, 2001). The amount of the plasticizer added is preferably from 1 to 25 wt%, more preferably from 1 to 20 wt%, most preferably from 3 to 15 wt%, based on the amount of the cellulose ester. The deuterated cellulose film of the present invention may further contain an anti-deterioration agent (e.g., an antioxidant, a peroxide decomposer, a radical inhibitor, a metal inerting agent, an acid scavenger, an amine) or an anti-UV agent. The anti-deterioration agent may be a compound described in each of the publications of Japanese Patent Publication No. 3-99201, No. 5-1907073, No. 5-194789-18-200922979, No. 5-271471, and No. 6-207054. . The amount of the anti-deterioration agent added is 0. 0 1 to 1 by weight of the prepared solution (dopant). /. Preferably, it is preferably from 0 to 0.2% by weight. As an example of a particularly preferred anti-deterioration agent, butylated hydroxytoluene (Β Η T) can be exemplified. The anti-ultraviolet agent is exemplified by the compounds described in Japanese Laid-Open Patent Publication No. Hei 7- 1 0 0 5 5 and JP-A-7-105. Further, as a matter of course, it is preferable to use the materials described in detail on pages 17 to 22 of the above-mentioned Art No. 2001-1745. It is preferred to add a compound having a hydrophobic group or fine particles, etc., in order to reduce the dimensional change due to moisture absorption of the produced cellulose film. In the case of a compound having a hydrophobic group, it is particularly preferable to use a plasticizer having a hydrophobic group such as an aliphatic group or an aromatic group in the molecule or a material equivalent to the anti-deterioration agent. The amount of the compound to be added is preferably in the range of from 1 to 1% by weight based on the adjusted solution (doping solution). Further, it is preferable to reduce the free volume in the deuterated cellulose film. Specifically, in the solvent casting method described later, the amount of residual solvent is small at the time of film formation, and the free volume is small. It is preferred to dry the amount of the residual solvent relative to the deuterated cellulose film in a range of from 1 to 1.00% by weight. [Manufacturing method of support] In the present invention, it is preferable to produce a cellulose-deposited film by a solvent casting method, and a film (dopant) in which deuterated cellulose is dissolved in an organic solvent is used to produce a film. As the organic solvent to be used, a well-known organic solvent can be used, and for example, it is preferred that the solubility parameter is in the range of from 7 to 2 2 . Solubility parameter, -19- 200922979 For example, J. Brandrup, E.H, et al., "Polymer Handbook (4th Edition)", VII / 6 7 1 to VII / 7 1 4 . A chloride of a lower aliphatic hydrocarbon, a lower aliphatic alcohol, a ketone having 3 to 12 carbon atoms, an ester having 3 to 12 carbon atoms, an ether having 3 to 12 carbon atoms, and a carbon number of 5 to 8 may be mentioned. An aliphatic hydrocarbon or an aromatic hydrocarbon having 6 to 12 carbon atoms. The ethers, ketones and esters may have a cyclic structure. Any of the functional groups of the ether, ketone and ester (i.e., -Ο-, -CO-, and -COO-) may have two or more compounds and may be used as an organic solvent. The organic solvent may have other functional groups such as an alcoholic hydroxyl group. In the case of an organic solvent having two or more functional groups, the number of carbon atoms is preferably within a predetermined range of the compound having any functional group. Specifically, for example, the compounds described in detail in the above-mentioned publication No. 2001-1745, pages 12 to 16. In particular, in the present invention, it is preferred to use a solvent in a mixture of two or more kinds of organic solvents, and a particularly preferred organic solvent is a mixed solvent of three or more kinds which are different from each other, and the first solvent is a carbon atom of 3 to 4 a ketone and an ester having a carbon number of 3 to 4 or a mixture thereof, and the second solvent is selected from the group consisting of a ketone having 5 to 7 carbon atoms or an acetamidine acetate, and the third solvent is selected from the group consisting of a boiling point of 3 0 to 1 Preferably, the alcohol at 70 ° C or the hydrocarbon having a boiling point of 3 0 to 1 70 t is preferred. In particular, it is used in an amount of 20 to 90% by weight of the acetate. /. The mixing ratio of 5 to 60% by weight of the ketones to 5 to 30% by weight of the alcohol is preferable in terms of the solubility of the cellulose acetate. Further, in the dope used in the present invention, the fluoroalcohol contains 10% by weight of the total organic solvent in addition to the above organic solvent. /. Hereinafter, it is preferred that -20-200922979 contains 5% by weight or less to improve the transparency of the film or to premature solubility. The fluoroalcohol is preferably a boiling point of 1 65 t or less, preferably 1 1 1 . . The following 'steps' to 8 0. . The following is better. The fluoroalcohol is preferably a carbon atom number of from 2 to 10, preferably from about 2 to about 8. Further, the fluoroalcohol-based aliphatic alcohol of the fluorine atom may or may not have a substituent. The substituent is preferably an aliphatic substituent having a fluorine atom or a fluorine-free atom, an aromatic substituent or the like. The fluoroalcohol may, for example, be a compound described in paragraph [0〇2〇] of the specification of Japanese Laid-Open Patent Publication No. Hei 8-143709, No. 11-60807, paragraph [0037], and the like. These fluoroalcohols may be used alone or in combination of two or more. Further, it is particularly preferable to use a non-halogen organic solvent containing no halogenated hydrocarbon. Technically, a halogenated hydrocarbon such as methylene chloride can be used without any problem. From the viewpoint of the global environment or the working environment, the organic solvent is preferably one which does not substantially contain a halogenated hydrocarbon. "Substantially free" means that the ratio of the halogenated hydrocarbon in the organic solvent is less than 5% by weight (preferably less than 2% by weight). Further, it is preferred that the cellulose acetate film produced is not halogenated as a halogenated hydrocarbon at all. The organic solvent to be used in the present invention, in particular, the paragraphs [0021] to [0025] of the specification of JP-A-2002-146043, and the paragraph [0016] to [0021 of the specification of JP-A-2002-146045 An example of a solvent system described in the following.

In the preparation of the deuterated cellulose solution of the present invention, the container may be filled with an inert gas such as nitrogen. The viscosity before the film formation of the cellulose triacetate solution is preferably in the range of the castable film, and is usually in the range of 10 to 2000 Pa.s, preferably 30 to 400 Pa. S-21 - 200922979 The preparation method of the deuterated cellulose solution (mixing liquid) of the present invention is not particularly limited, and may be a room temperature dissolution method, a cooling dissolution method or a high-temperature dissolution method, and further, the combination thereof. To implement. For example, JP-A-5-1-63301, JP-A-61-106628, JP-A-58-127737, JP-A-9-95544, and JP-A-10-95854,曰本特开平 ι〇_4595◦, 曰本特开 2000-53784号, Japan Special Kaiping h-322946, and Japanese Special Kaiping 11-322947, Japanese Special Kaiping 2-276830, Japan Special Open 2000- No. 273239, Japanese Unexamined Flat ιι_7ΐ463, 曰本特开平 04-259511, Japanese Patent Laid-Open No. 2000-273184, Japanese Patent Laid-Open No. 11-323 017, JP-A-11-302388, etc. Modulation of cellulose solution. The above-described method for dissolving the organic solvent of the enzymatic cellulose may be suitably applied to the above techniques. Further, the doping solution of deuterated cellulose is usually subjected to concentration and filtration of the solution, and is similarly described in detail in the above-mentioned publication No. 2 0 0 - 1 7 4 5, p. Further, in the case of dissolving at a high temperature, most of them are above the boiling point of the organic solvent used, and this case can be used in a pressurized state. Next, in the present invention, a film production method using a deuterated cellulose solution will be described. A method and apparatus for producing a bismuth cellulose film, which is referred to as a drum method or a belt method for producing a cellulose triacetate film, can be a known solution casting method and a solution casting film forming apparatus. Taking the belt method as an example, the film forming step is described, and the doping liquid (deuterated cellulose solution) prepared by the dissolving machine (boiler) is temporarily stored in a storage boiler, and the bubble contained in the doping liquid-22-200922979 is taken off. The bubble is subjected to final modulation. The prepared doping liquid is self-doped to the discharge port by a self-doping discharge port, for example, by a type-type gear pump capable of quantitatively feeding liquid by a rotation number, so that the doping liquid is self-pressing the die (slit) Casting over the continuously extending metal support, the semi-doped liquid film (referred to as the web) from the metal at the point where the metal support is approximately one turn away The support is peeled off. Both ends of the obtained layer were sandwiched by a jig, and dried while being wide-held while being stretched by a tenter, and then conveyed by a roll group of a drying device to complete the drying of the winder to a set length. The tenter and the drying device of the roller group can be changed according to the purpose. For each of the manufacturing steps (classified as flow; co-flow &amp;), metal support, drying, peeling, stretching, etc., the details of the public technology No. 2001-1745, pages 25 to 30, can be exemplified. . In the casting step, one type of deuterated cellulose solution may be subjected to a single layer flow, or two or more kinds of deuterated cellulose solutions may be co-cast simultaneously or successively [Method of imparting adhesion to a transparent support] Optical of the present invention In the case where the alignment film is applied by a coating method, the compensation film is provided with an adhesive property on the surface of the transparent support, and it is preferable to uniformly apply a coating liquid for the alignment film at the surface. As the method of the surface treatment, a primer coating method for providing an alignment film can be exemplified. A single layer method in which a layer described in JP-A-7-3 3 3 3 3 3 or a resin containing gelatin such as a hydrophobic group and a hydrophilic group is applied to one layer is used, and the first layer is well provided as a first layer. The layer of the sub-film is adhered to the sub-film layer (hereinafter referred to as the first layer of the undercoat layer), and a hydrophilic resin layer such as gelatin which is in close contact with the alignment film is applied thereon (the following sub-liquid pressure is sprayed uniformly) Mesh-transported dry group S (including the pre-extension, the bottom layer of the layer is only the high score 2, -23-200922979 is the second layer of the base coat), the so-called heavy H 11- In the case of other surface treatments, the surface of the film may be modified, such as treatment, ultraviolet irradiation treatment, or alkali treatment at the flame, as described in the above-mentioned Japanese Patent Publication No. 2001-1745. It is especially good in these areas, which is extremely effective for surface treatment of saponification. f ' [Alignment film] Next, an alignment film formed on the support is preferably coated with an organic compound. It is preferred that the polymer film is in close contact with the optically anisotropic layer of the alignment film or the upper layer. The alignment film system is provided for the alignment direction of the compound. As the method of imparting the formulation, well-known honing, magnetic f i κ, and the like can be exemplified. The alignment film provided by the present invention can be changed in kind. In the liquid crystal cell, the rod-like liquid crystal is distributed to the display mode (for example, the liquid crystal molecules of the VA and OCB directional layers are substantially intrinsic to the majority of the rod-like liquid crystal molecules (for example, STN), and the optical In the opposite direction, for example, the Japanese special open corona discharge treatment, glow discharge treatment, ozone treatment, acid treatment, and the like. In this regard, the details are as follows: Bulletin pages 30 to 32 The alignment film of the film of the present invention is described. The strength of the film itself of the present invention (preferably polymer) coating liquid is defined by the liquid crystallinity of the film which is provided by the hardening to the lower layer. The functional square field or the electric field is applied, and the light irradiation is substantially vertical and 按照 according to a majority of the display modes of the liquid crystal cell, and has a function of aligning the optical heterogeneous level. The display mode layer of the liquid crystal cell is horizontally aligned. The liquid crystal molecule is substantially a function of vertical alignment from -24 to 200922979. The rod-like liquid crystal molecules in the liquid crystal cell are substantially tilt-aligned display mode (for example, TN), The function of the liquid crystal molecules of the alignment layer to perform the oblique alignment substantially. The type of the specific polymer used in the alignment film in the present invention, and the optical compensation film using the crystal molecules corresponding to the respective display modes of the above various types are described. The polymer used for the alignment film may be a combination of any of its own crosslinkable materials or a polymer crosslinked by a crosslinking agent, and may be exemplified by, for example, Japan. The compound described in paragraph [0022] of the specification of No. 8-338913 is preferably a water-soluble polymer (for example, poly(N-methylol acrylamide)-based cellulose, gelatin, polyvinyl alcohol, modified polyvinyl alcohol. Among them, polyvinyl alcohol and modified polyvinyl alcohol are preferred, and polyvinyl alcohol and modified alcohol are preferred. The degree of saponification of polyvinyl alcohol is preferably 70 to 100%, more preferably 803, 85 to 95. % is the best. The degree of polymerization of polyvinyl alcohol is preferably 1〇〇3. The modified group of modified polyvinyl alcohol can be introduced by copolymerization modification, modification or block polymerization modification. Examples of the base, exemplified (carboxylic acid group, sulfonic acid group, phosphine a base, an amine group, an ammonium group, a guanamine group, or the like, a hydrocarbon group having 10 to 100 carbon atoms, a thioether group substituted with a fluorine atom, and a polymerizable group (unsaturated polymerizable group, epoxy group, hydrazine, etc.) Specific examples of the modified polyvinyl alcohol compound such as alkoxymonoalkylene group (trialkoxy group, dialkoxy group, monoalkoxy group), and the like, To be flattened. Compared with carboxymethyl gelatin 'polyethylene? 100% ΐ 3000 chain mobile hydrophilic group, thiol group, propyl base), etc., as described in Japanese Patent Application Publication No. 2000-56310 Paragraphs [0074], and paragraphs [0022] to [0145] in the specification of the Japanese Patent Publication No. 2000-155216, and the contents described in paragraphs [0018] to [0022] of the specification of the Japanese Patent Publication No. 2002-62426. [Curing compound for hardening] The composition for forming an alignment film in the present invention is used for curing a polymer (preferably a water-soluble polymer, more preferably a polyvinyl alcohol or a modified polyvinyl alcohol) used for the alignment film. The compound for curing includes an aldehyde compound containing two or more aldehyde groups. Specific compounds are, for example, glyoxal, malondialdehyde, succinaldehyde, glutaraldehyde, adipaldehyde, pimediol, suberaldehyde, sebacaldehyde, sebacaldehyde, asparadehyde, 1, 2,4 - Dingyuan carbaldehyde, 3-methyl decyl adipaldehyde, cyclohexane dicarbaaldehyde, cyclohexane diethyl aldehyde, furfural, isophthalal, terephthalaldehyde, benzene Trialdehyde ' 1,4,5,8 -naphthalene tetraacetal aldehyde, two-terminal hydroformylated polyvinyl alcohol (poval), aldehyde starch, and the like. The aldehyde compound provided by the present invention is not limited to these. Among these, a bifunctional (two aldehyde groups) aliphatic aldehyde compound having high reactivity is preferred. Further, in terms of the compound for curing provided, a known crosslinking agent can be used. For example, an N-methylol compound or a dioxane derivative, a compound which acts by activating a carboxy group, is an active compound, an active halogen compound, an isoxazole or the like. Specifically, for example, the compounds described in paragraphs [0023] to [0024] in the specification of JP-A-2002-62426 can be exemplified. -26- 200922979 In the case of using such a crosslinking agent, the total hardening compound is preferably 30% by weight or less, preferably 10% by weight or less. The amount of the compound for hardening is preferably from 0.1 to 20% by weight, more preferably from 5% to 15% by weight, based on the polymer. The amount of the unreacted hardening compound remaining in the alignment film is preferably 5% by weight or less, more preferably 5% by weight or less. When the curing compound remaining in the alignment film is 1% by weight or less, sufficient durability can be obtained. Further, by using such an alignment film in a liquid crystal display device, even if it is used for a long period of time or in a high-temperature and high-humidity atmosphere, a reticulate structure does not occur. [Nucleophile agent contained in the alignment film Further, the composition for forming an alignment film is preferably a nucleophilic agent containing at least one nucleophilic number (nCH3I) of Pearson or the like of 5 or more and 10 or less. The nucleophilic constant (η) of Pearson or the like is preferably 6.5 or more and 10 or less, preferably 7 or more and 10 or less (hereinafter, the nucleophilic constant (nCH3〇 is also described as a nucleophilic constant (η)). The nucleophilic constant (nCH3i) of Pearson et al., according to RG Pearson, et al., J. Am. Chem. Soc., 89, 1827 (1967), Okamoto Man, 'Organic Reaction Mechanism 3, nucleophilic substitution reaction For the nucleophilic reagent of the above-mentioned nucleophilic constant (η), for example, the following reagents (the numerical value of the parentheses (N) An organic base (for example, triethylamine (6.66), diethylamine (7:00), hydrazine, ν_dimethylcyclohexylamine (6-73), pyridine (5.23), pyrrolidine (7.23) , piper steep (7.30), aniline (5.70), hydrazine, hydrazine-dimethylaniline (5.64), etc., -27- 200922979 ΝΗ 3 (5·5), ArO- (Ar stands for aryl, phenyl, tolyl , methyl benzyl (xylyl), methoxy phenyl, etc., such as phenate anion (5.75), etc., hydroxylamine (6.60), SCN (6.70), thiourea (7.27), ΟΗ-(6·58), Ι-(7·42), R) 3P (R is a hydrocarbon group or a -Ri group (Ri represents a hydrocarbon group)). In terms of a hydrocarbon group, there are a methyl group, an ethyl group, a propyl group, a butyl group, a hexyl group, a phenyl group, a tolyl group, etc., for example, triethylphosphine ( 8.72), tributylphosphine (8.69), triphenylphosphine (7.0 Å), trimethoxyphosphine (5.00), etc.), RS-(R represents a hydrocarbon group, and examples thereof include a butyl group, a hexyl group, an octyl group, and a phenyl group. , tolyl group, etc. phenylthio (thiolate) anion (9_92), etc., S〇32_(8_53), S2〇32-(8_95), etc. exemplified as an anionic molecule of the above nucleophilic reagent, A compound which forms an inorganic cation and a salt is used (referred to as a "nucleophile" in the present invention). The inorganic cation is not particularly limited, and specifically, an ammonium cation or a metal cation (metal, alkali metal, alkaline earth metal, Any of transition metals and the like is good. For example, L i, N a , K, B e, Mg, Ca, Ba, Ce, Ti, Zr, Hf, V, Nb, Ta, Mo' W , Co, Cu' Ag, Zn, B, A1, etc., preferably selected from ammonium cations, or Li, Na, K, Mg, Ca, Ba, Al, Ti, Zr, Co, Ni, Zn Metal ion More preferably, a salt having a good solubility in water/methanol is formed. Thereby, the optical alignment film obtained by aligning the obtained alignment film with an alignment means and then applying an optical anisotropic layer is coated. It is good to improve or reduce the optical defects such as whitening. The reason for our speculation is that the nucleophilic substance contained in the alignment film will align the liquid crystal molecules in the stable and uniform distribution of the crosslinking agent contained in the alignment film to the liquid crystal molecules when the optically isotropic layer is applied stably and uniformly. The effect of the state can be reduced as one of its causes. Of course, since the effect of adding amounts is not the same, it is necessary to adjust the amount of time. The nucleophilic agent of the present invention may, for example, be a sulfite (sodium salt, potassium salt, ammonium salt, etc.) which produces a sulfite ion, and a thiosulfate salt (sodium salt or potassium salt) which produces a thiosulfate ion. , ammonium salts, etc.). The preparation method of the coating liquid for the alignment film may, for example, be a method of separately adding a crosslinking agent or a nucleophilic agent to a solution of a material for dissolving the alignment film, and (b) preparing a solution of a high concentration crosslinking agent. a method in which a nucleophilic agent is added to add a mixed solution to a solution in which a material of an alignment film is dissolved, and (c) a solution in which a mixed solution of a high concentration crosslinking agent and a nucleophilic agent is dissolved in a solution for dissolving the alignment film is added. Method of adding. The solution of the high-concentration crosslinking agent is preferably a solution of 1 Torr to 50 volts %, and is preferably carried out by the method of (b) to (c) in the present invention. The alignment film system contains at least the polymer, an aldehyde compound (a compound for curing), and a coating liquid for a composition for forming an alignment film of a nucleophilic agent, which are applied onto a support, and then dried by heating (crosslinking). The cured film formed by the alignment treatment. The crosslinking reaction can be carried out at any time after being applied to the support as described above. When a polyvinyl alcohol-like water-soluble polymer is used as a composition for forming an alignment film, it is preferred that the coating liquid be a mixed solvent of an organic solvent having a defoaming action (for example, methanol, ethanol, isopropyl alcohol, etc.) and water. . The ratio is in the weight ratio, water: methanol = 〇: 1 〇 〇 ~ 9 9 : 1 is better, 0: 100 ~ 91: 9 is better. Thereby, the occurrence of bubbles can be suppressed, and the alignment film can be remarkably reduced in surface unevenness of the optically different layer. [Addition amount of nucleophilic agent] -29- 200922979 The amount of the nucleophilic agent to be added is preferably from 1 to 10% by weight, more preferably from 0.005 to 0.8% by weight, based on the total amount of the polymer. When the amount of the nucleophilic agent added is within the above range, good alignment of the liquid crystal can be obtained, and alignment defects or unevenness of the liquid crystal domain are not preferable. [Method of Forming Alignment Film] A method of forming an alignment film will be described below. Fig. 1 is a schematic overall view showing a method of manufacturing an optical compensation film of the present invention. The web roll la 1 which is a strip-shaped flexible support is fed from the feeder 2 from the long film roll (film roll) 1 of the film. The mesh layer la is guided to the dust remover 4 by the guide rolls 3. The dust attached to the surface of the mesh layer la is removed by the dust remover 4. Then, the coating liquid containing the composition for forming an alignment film is applied to the surface of the network layer la by the coater 5 to form a coating film on the surface of the network layer la. The method of applying the composition for forming an alignment film to the coater 5 can be carried out by a dip coating method, an air knife coating method, a curtain coating method, a roll coating method, a wire bar coating method, a gravure coating method, or a micro gravure printing method. Coating by a method such as a die coating method (extrusion coating method (US Pat. No. 2,681,294), a slip coating method, or an extrusion coating method). As for the coating method, it is like various documents (for example, modern coating and drying technology, Edward Cohen and Edgar B. Gutoff).

Edits., VCH Publishers, lnc, 1 992). It is preferable to use a bar (r 〇d) coater method, a gravure coater method, a knife coater method, or a die coater method which can be stably operated even in a small coating amount range, particularly a bar coater method or a mold. The coater method is preferred. -30- 200922979 The mesh layer la formed by the coating film is conveyed to the drying device 6. The drying device 6 includes a first region 6a for performing constant-speed drying and a second region 6b for decelerating and drying. The coating film is dried and hardened in the drying device 6 by dry air. 'The alignment film formed on the network layer 1 a and having a degree of crystallization of 0 · 2 to 0 · 8 by the ATR / IR method (alignment film forming material) Floor). Further, the mesh layer 1 a formed by the alignment film may be temporarily wound as a film roll. The mesh layer la formed by the alignment film is guided by the guide roller 7 and transported to the honing processing device 8. The honing treatment device 8 is a device for aligning the alignment film on the mesh layer la. The honing processing apparatus 8 of this embodiment is constituted by a honing roller 8a wound around the outer peripheral surface of the honing cloth, an air nozzle 8b, a back roller 8c, and a dust remover 8d. The honing treatment is a method in which the surface of the alignment film is wiped in a certain direction using paper or gauze, felt, rubber or nylon, polyester fiber or the like to impart a force to the alignment film. In general, it is carried out by honing a fiber having an average length and a uniform thickness by averaging several times. In the present embodiment, the honing roller 8a is rotated in the direction of the arrow, and the aligning process is performed by wiping the alignment film with a honing cloth. At this time, the honing treatment is carried out at a working amount of 300 to 800 Nm/m2, and the alignment film can be imparted with a regulating force. The lap angle of the lightening layer 8a of the mesh layer la can be adjusted by moving the back roller 8c up and down. Further, the air nozzle 8b is provided above the honing roller 8a. The air nozzle 8b can spray a gas (air, nitrogen gas, or the like) to the inner surface side of the mesh layer la (the side where the alignment film is not formed). The mesh layer la is pressed against the honing roller 8a by the gas ejected from the air nozzle 8b. -31 - 200922979 The aligning film having a degree of crystallization of Ο 2 to Ο 8 can effectively suppress the occurrence of smear from the alignment film by setting the amount of the honing treatment to 300 to 800 Nm/m 2 '. The surface of the alignment film subjected to the honing treatment can be dedusted by a surface dust remover 9 provided adjacent to the honing processing device. As the honing treatment device, a well-known device other than the above may be used. The mesh layer la formed by the alignment film is transported to the coater 10 by a driving roller. The coating liquid containing the liquid crystalline disk compound is applied onto the alignment film by the coater 10. Next, after evaporating the solvent, the coating layer is heated to a dish-like nematic phase formation temperature in the heating zone 1 (the residual solvent of the coating layer is also evaporated), and the liquid crystal layer of the dish-like nematic phase is Formed on the mesh layer 1a. _ ′ Next, the liquid crystal layer is irradiated with ultraviolet rays by an ultraviolet (UV) lamp 12 to crosslink the liquid crystal layer. In order to crosslink the liquid crystal, it is necessary to use a liquid crystalline disc compound having a crosslinkable functional group. In the case of using a liquid crystalline disc compound having no crosslinkable functional group, the ultraviolet irradiation step can be omitted and cooling is immediately performed. In this case, it is necessary to perform rapid cooling so that the dish-like nematic phase does not break during cooling. The transparent film formed by the alignment film and the liquid crystal layer can be examined for the presence or absence of abnormalities by measuring the optical characteristics of the surface of the transparent film by the inspection device 13. Then, the protective film 14 from the feeder 17 is bonded to the surface of the liquid crystal layer by the bonding machine 15, and is wound around the winding device 16. Fig. 2 is a schematic view showing the coating step of the method for forming the alignment film, the outline of the drying and effect steps, and the temperature change of the film surface temperature with respect to the drying time. The coating liquid of the composition for forming an alignment film to be applied to the mesh layer is transported to a drying apparatus 6 having a plurality of drying zones 61 by -32 to 200922979, and dried. In the drying device 6, a plurality of partition plates which are straight toward the traveling direction of the mesh layer are separated, thereby being divided into a plurality of dry regions 61. Each of the drying zones 6 1 is provided with a drying air generating means 62, a drying means 63 for drying the air, and a heating means 64 for heating the drying air. In each drying zone 6, the temperature and air volume of the dry wind can be adjusted. Then, the film surface temperature can be adjusted according to the temperature of the dry air and the adjustment of the air volume. Further, in Fig. 2, the drying zone 61 has seven zones, but the number of the drying zones is not particularly limited, and can be appropriately set depending on the conditions for forming the alignment film. Further, in order to adjust the film surface temperature of the mesh layer 1a, a drying air control means 65 for controlling the temperature and the air volume of the drying air is provided. The dry air generating means 62 and the heating means 64 can be controlled depending on the temperature of the dry air and the film surface temperature. The film surface temperature can be adjusted by controlling the temperature and air volume of the dry wind. In the second drawing, the dry air control means 65 is described only in the dry area 61 g, and is preferably provided in all the dry areas 61. In the measurement of the surface temperature measuring means for measuring the surface temperature of the mesh layer 1 a, various known measuring means such as an infrared thermometer or a radiation thermometer can be used. The temperature in the drying zone 61 is first supplied to the drying zone 61 by drying dry air having a temperature higher than the hardening temperature at which the coating film is hardened. In the drying in the constant-speed drying period at the initial stage of drying, most of the heat of the dry air is volatilized by the solvent used in the coating film, so that the compound for drying and hardening does not volatilize even at a drying air temperature higher than the curing temperature. The drying of the coating film can be promoted (first step). -33- 200922979 Next, when the solvent in the coating film is reduced, and the shift to the deceleration drying period, most of the heat of the drying wind is used to increase the film surface temperature and lower the drying speed (second step). At the start of drying, the film surface temperature rises from the wet bulb temperature at a certain time. In the present invention, the pre-rise is referred to as a constant-speed drying period, and is referred to as a deceleration drying period after the point at which the rise is started. When the film surface temperature is in the constant-speed drying period of the wet bulb temperature, the intra-membrane movement of the volatile matter in the film is sufficiently advanced, and the liquid volatilized from the surface is sufficiently present. Then, in the deceleration drying period, the volatile matter in the film is insufficient in surface, and even if the same wind is applied, the drying speed is delayed. At the point of shifting from the constant-speed drying period to the deceleration drying period, when the solid content concentration is measured, it represents 80% or more. When the solid content concentration is 80% or more, the film surface temperature can be controlled in the range of 25 ° C to 135 ° C. The coating film is dried and hardened by the drying device 6. The polymer layer of the coating film is crosslinked by the drying device 6, and finally an alignment film having a degree of crystallization of 0.2 to 0.8 can be formed. The first step of drying and hardening step, and the second step of performing deceleration drying means constant drying and deceleration drying in the drying and hardening steps. In the drying device 6, the first region where the constant-speed drying is performed and the second region where the deceleration is dried are not clearly distinguishable, but only the drying device 6 performs constant drying, slow drying, and deceleration drying. The receiver's method of measuring the solid concentration is described. The solid content concentration here means the solid content concentration (%) = solid content / (volatile matter + solid content) Χ 100 -34 - 200922979 solid content and (volatile matter + solid content), which can be determined by weight 'by the following Formula (1) and Formula (2) to obtain "solid content = [A: film weight after drying] - [B: weight of support before coating] · (1) Volatile matter + solid content = [c : film weight sampled in a dry area]-[B: weight of support before coating] (2) Therefore, when taking samples in a certain area, each is measured: A: above the boiling point of the volatile matter Absolutely dry weight, B: weight measured by stripping A, C: weight measured immediately after sampling, and solid concentration can be obtained. In the drying and hardening steps of the present invention, the alignment film is formed as described above, and an alignment film having a degree of crystallization of 2 to 0·8 can be obtained. When the degree of crystallization of the alignment film is smaller than 〇 · 2 , the alignment film becomes undried. When the aligning process is performed on the alignment film, the alignment is poor. Further, when the degree of crystallization of the alignment film is larger than 0.8, the alignment film becomes hard and brittle. When the aligning treatment is performed on the alignment film, the amount of dust generation increases, resulting in an increase in the number of bright spots. In addition, the coating liquid for the composition for forming an alignment film of the present invention is applied to a support and dried, and the coating liquid for optical anisotropic layer is applied after being aligned by an alignment means to maintain the surface of the alignment film. It is preferably in the range of pH 4.0 to 10.0. Furthermore, ΡΗ4·5~8.0 is better. Further, when the coating liquid for an optically oriented layer is applied, the pH of the surface of the alignment film in the width direction of the coating is wide, ΔρΗ, preferably in the range of ±0.30. Preferably, ΔρΗ is in the range of ±0.15. -35- 200922979 When the pH variation is within the above range, an optical compensation film coated with an optically anisotropic layer can reduce optical defects more preferably. The method for measuring the pH of the alignment film surface is to leave the sample coated with the alignment film in an environment of (temperature 25 ° C / humidity 65% RH), and then add 1 m of pure water under a nitrogen atmosphere. 1 Read p 快速 quickly in p Η. The pH of the surface of the alignment film of the present invention is specified, and ΔρΗ in the width direction of the coating is controlled, and coating by the above-described bar coater method or die coater method can be carried out. Further, it is also effective to adjust the air volume, the wind direction, and the like in the case where the film surface drying temperature or the dry air is used. The following honing work amount per unit area of the present invention will be described with reference to the drawings. The general workload is as shown in Fig. 3(a), and the force F(N) is applied to the object. When the object is moved in the direction of force only S (m), the amount of work L (Nm) Can be obtained from L : F · S ... (1 ). Further, as shown in Fig. 3(b), when the object of weight W is moved only by S on the horizontal ground, if the dynamic friction coefficient is #, the magnitude L of the workload can be from L = 仁 · W · S ... ( 2) Get it. When honing the workload, the //, W and S in the honing process can be obtained. Fig. 4 is an enlarged view of a principal part showing a positional relationship between the back roller 8c, the air nozzle 813, and the honing roller 8&amp;; (a) is a front view, and (b) is a right side view. The honing processing apparatus 8 is provided with a back roller 8c disposed on the upstream side and the downstream side -36-200922979 of the honing roll 8a. In the honing processing apparatus 8, the mesh layer la has a constant transport tension T (N), and the transport speed V (m/min) travels in the direction of the arrow. The mesh layer la in the middle is pressed against the honing roller 8a by the force of the set honing angle β and F1 by the force of the downward direction of the back roller 8c. Further, the air nozzle 8b has a length that is slightly the same as the width of the mesh layer la. The front end of the air ejection port is disposed in parallel with the axis of the honing roller 8a. This gas ejection position is on the center line which bisects the honing angle of the mesh layer la. The gas system is pressed from the inner surface side of the mesh layer 1 a to a uniform pressure P(Pa)' in the width direction of the mesh layer la at the width h(m) and the mesh layer la is pressed by the force of F2 Honing roller 8a. In the honing process, the honing light 8a is rotated in the direction opposite to the traveling direction of the mesh layer la by the set number of rotations N (rpm). Under this condition, when the formula (2) is satisfied, the weight W is the total of the forces F 1 and F2 applied to the mesh layer 1 a . Therefore, the magnitude L ' of the workload is L = μ (F 1 + F2) S · (3) Next, the moving distance S is moved in the opposite direction by the mesh layer la and the honing roller 8a, so the moving distance S The distance traveled by the mesh layer la is the total distance from the rotation of the honing roller 8a. If it becomes the traveling speed V (m/min) of the mesh layer la, the radius r (m) of the light 8a is honed, and the moving distance S of each minute when the number of rotations N (rpm) is S, S = V + 27Γ rN ... ( 4) Substituting it into equation (3), the workload per minute, Lm becomes (F1 + F2) (V + 2π rN)··· (5) -37- 200922979 Finally, F1 and F2=F1 are obtained. Grinding angle 6 &gt; (.), handling tension T (N), radius r (m) of the honing roller 72, and bottom layer width w (m) of the mesh layer la is F 1 = 1 80T / 7 Γ Θ - ( 6)

Further, F2 becomes the air pressure P force (Pa) from the air nozzle 8b. The air press width h (m), the bottom layer width of the mesh layer w (m), shell! J F2 = P· SO· w...(7) When substituting equations (6) and (7) into equation (5), the honing workload Ls per unit area becomes, Ι^3=/ζ(180Τ/7γ β +Ρ. SO. w) (V + 27rrN) ". (8). In the present invention, the honing workload Ls per unit area is controlled in the range of 300 to 800 Nm / m 2 . The honing workload is 300 Nm. When /m2 is smaller, the regulation force of the alignment film is weakened, resulting in poor alignment. Moreover, when the honing work is larger than 800 Nm/m2, the friction of the alignment film becomes stronger, so that the amount of dust increases, resulting in the number of bright spots. The graph of Fig. 5(a) shows the relationship between the film surface temperature and the number of bright spots. The film surface temperature (°C) of the horizontal axis represents the film surface temperature in the second region of the drying device 6, that is, deceleration and drying. Film surface temperature (solid content concentration 80%). The number of bright spots on the vertical axis (units/m) ' indicates the failure of the alignment film of each product lm after coating the liquid crystal layer on the alignment film (point The number of defect faults. From this graph, it can be understood that the lower the film surface temperature, the smaller the number of bright spots (point defect faults). Here, the number of bright spots is shaped The optical film on which the liquid crystal compound coating film is applied to the alignment film is transported between the polarizing plates of the group i in which the crossed Nicols are disposed, and the light source is disposed on one side of the polarizing plate, and the other side of the polarizing plate is -38- 200922979 The CCD camera is equipped with a CCD camera to detect the transmitted light generated by the misalignment of the foreign matter and the liquid crystal. The graph of Fig. 5(b) shows the relationship between the film surface temperature and the number of bright spots. The temperature (°C) indicates the same temperature as the film surface temperature of the graph of Fig. 5(a). The amount of dust generated on the vertical axis (units/CF), when the reticular layer is floated and transported after the honing step The number of dust contained in the floating wind. When the composition of the dust is analyzed, the dust is the PVA (polyvinyl alcohol) of the alignment film material. The number of dust corresponds to the amount of dust generated. From this figure, it can be understood that the film surface temperature is higher. When the amount is low, the amount of dust generated is reduced. Here, the amount of dust generated is measured by a microparticle measuring instrument (Airnet Model 301) manufactured by PMS (P ar ti c 1 e Measuring Systems). Fig. 5 (c) Membrane surface temperature The relationship with the degree of crystallization. The film surface temperature (°C) on the horizontal axis indicates the same temperature as the film surface temperature in the pattern of Fig. 5(a). The degree of crystallization on the vertical axis indicates the alignment measured by the ATR/IR method. The degree of crystallization of the film. It can be understood from the graph that the lower the film surface temperature, the lower the degree of crystallization of the alignment film. Here, the ATR/IR method refers to Attenuated Total Reflection absorption spectroscopy (Attenuated Total Reflection absorption spectroscopy: The meaning of the standard chemical term dictionary (2nd edition). Specifically, a transparent material having a large refractive index such as quartz is closely adhered to a sample (solid or liquid), and when the incident light is irradiated from a transparent object side at an incident angle, total reflection occurs, and the reflected light is in the vicinity of the close contact surface (number// m) It is absorbed by a very small number of sample materials -39- 200922979, so it can reflect the absorption characteristics of the sample. The change in the intensity of this totally reflected light is determined to obtain the spectral method. The ATR / I R method is implemented under the following conditions. [Device and measurement conditions] J-fixing device: FTS7000 (manufactured by Varian) prism: Torque between 锗 prism and sample: 3 0 c N · m Sample (0.75 cm2: Clamp 10567 manufactured by Specac) PVA Side is ATR crystal plane AT R Crystal pressing pressure: 2 Ο N / m2 Incident angle: 45° ' Number of reflections: 256 wavenumber decomposition energy: 4cm-i Wavenumber range: 4 0 0 0~6 5 0 cm -1 [Analysis] The peak-to-turn ratio of the wave number (114 4 cm-i) and the wave number (1712 cm_i) is the relative crystallinity. Bright spot defects are mainly caused by the occurrence of dust. As is clear from the graphs of Figs. 5(a) to (c), the lower the film surface temperature, the lower the degree of crystallization. In order to cope with this, the amount of dust generation is reduced. The present invention was first discovered by the inventors of the present invention in response to the reduction in the amount of occurrence of dust so that the reduction of the bright spot defects is completed. [Optical anisotropic layer] -40-200922979 The optically anisotropic layer of the present invention is formed of a liquid crystal molecule, and it is preferable to use a rod-like liquid crystal molecule or a discotic liquid crystal molecule. Examples of rod-like liquid crystalline molecules, such as methylimine, oxidized azo, cyanide, cyanophenyl, benzoate, phenylcyclohexanecarboxylate, cyanophenylcyclohexane Preferred are cyanide-substituted phenylpyrimidines, alkoxy-substituted phenylpyrimidines, phenyldioxanes, diphenylacetylenes, and alkenecyclohexylbenzonitriles. Such compounds may, for example, be the quarterly journal of the Chemical Society of Japan, Chemicals, Vol. 2, Liquid Crystal Chemistry (1 994), Chapter 4, Chapters 7 and 11 'and the liquid crystal device manual, Japanese academics. Compounds such as those described in Chapter 3 of the 142th Committee of the Promotion Association. The low-molecular-weight liquid crystal compound is preferably a polymerizable group in the molecule (for example, the specification paragraph [0016] of JP-A-2000-304932, and the specification paragraph [〇〇55] of JP-A-2002-6138. ). Not only the above low molecular liquid crystalline molecules but also polymeric liquid crystal molecules can be used. The polymer liquid crystal molecule is a polymer having a side chain corresponding to the above low molecular liquid crystal molecule. The optical compensation film to which the polymer liquid crystal molecule is used may, for example, be a compound described in JP-A-2005-530001. As for the liquid crystal molecules, a wide variety of documents can be exemplified (C. Destrade et al, Mol. Crysr. Li q. Crys t., vo 1. 71, page 111 (1 9 8 1); The chemistry editor, the quarterly chemistry general, No. 22, liquid crystal chemistry, Chapter 5, Chapter 10, Section 2 (1994); B. Kohne eta 1. , Angew. C hem . , vol. 96, 70 (19 8 4); JM

Lehn et al., J. C he m. Soc., Chem. Comm., page 17 9 4 -41 - 200922979 (1 9 8 5 ) ; J. Zhang et al., J. Am. C hem . Soc. , vol. 116 page 2655 (1 994)). The polymerization of the discotic liquid crystal molecules is described in JP-A-8-27284. In order to fix a discotic liquid crystalline molecule by polymerization, it is necessary to bond a discotic core of a discotic liquid crystalline molecule to a polymerizable group which is a substituent. It is preferred that the disc-shaped core and the polymerizable group are bonded via a bonding group, whereby the alignment state can be maintained in the polymerization reaction. For example, the compounds described in paragraphs [0151] to [0168] in the specification of Japanese Patent Laid-Open Publication No. 2000- 1 552 166 can be exemplified. Further, the liquid crystal cell in which the rod-like liquid crystal molecules of the STN mode are twisted is aligned, and the discotic liquid crystal molecules may be twisted and aligned for the purpose of optical compensation. When the above-mentioned bonding group introduces an asymmetric carbon atom, the discotic liquid crystalline molecules can be twisted and aligned into a spiral shape. Further, even if a compound exhibiting an optical activity containing an asymmetric carbon atom (for a palmitic agent) is added to the optically anisotropic layer, the discotic liquid crystalline molecules can be twisted and aligned in a spiral shape. Further, two or more kinds of discotic liquid crystalline molecules may be used. For example, the above-mentioned polymerizable discotic liquid crystalline molecules and non-polymerizable discotic liquid crystalline molecules can also be used. The non-polymerizable discotic liquid crystal molecule is preferably a compound in which a polymerizable group of the above-mentioned polymerizable discotic liquid crystalline molecule is changed to a hydrogen atom or an alkyl group. In other words, the non-polymerizable discotic liquid crystal molecule may, for example, be a compound described in Patent No. 2040083. [Other components of optical anisotropic layer] -42-

200922979 together with the liquid crystal molecules described above, the uniformity of the coating film can be achieved by using a plasticizer, a polymer containing a fluorine-containing aliphatic group, a polymerizable monomer, a polybenzazole, a tilting angle controlling agent, and the like. The alignment of liquid crystal molecules is improved. It has a liquid crystal property and can impart a change in the tilt angle of the liquid crystal molecule, or is not preferable. The polymerizable monomer may, for example, be a compound having a radical polymerizable property or a combination. The liquid crystal compound containing a polymerizable group and the copolymerizable substance I described above are preferably those described in the specification of JP-A-2002-296423. The amount of the above compound to be added is generally in the range of 1 to 50% by weight, preferably in the range of 5 to 3. As the surfactant, a well-known compound can be exemplified, and a surfactant is preferred. Specifically, for example, the compound of the paragraph [0028] to the specification of the Japanese Patent Publication No. 2001-330725 can be exemplified. The polymer used together with the discotic liquid crystalline molecule is preferably changed to a discotic liquid crystalline molecule. In particular, the present invention is described in the specification of the Japanese Patent Publication No. 2004-139015, and the compound described in [0029] to [0058]. The polymer is exemplified by a cellulose ester. The preferred example of the cellulose ester is exemplified in paragraph [0178] of the specification of JP-A No. 2000-155216. The active agent, the substance, the alignment, and the proton of the membrane are preferably dissolved by the cation polymer. For example, it is a fluorine-containing Japanese special opening [0 0 5 6 ]: a pretilt angle, for example, 曰[0036]~ a paragraph f in the book, which may be exemplified by Japan. Special things. For the purpose of -43-200922979, the alignment of the liquid crystalline molecules is not inhibited, and the amount of the above-mentioned polymer added is relative to the liquid crystalline molecule at a weight of 1 to 10%. /. The range is preferably 'with a range of 0.1 to 8 weight%. The solid phase transfer temperature of the dish-like liquid crystal phase of the discotic liquid crystal molecules is preferably 70 to 300 ° C, more preferably 70 to 170 ° C. The above-mentioned compound may, for example, be an optically oriented layer described in Japanese Patent No. 2004-139015. The polymer containing a fluorine-containing aliphatic group (hereinafter referred to as "polymer A") contains: a repeating unit derived from a fluorine-containing aliphatic group monomer and a weight represented by the following formula (1) Copolymers of the coating unit are preferred. General formula (1)

For the compound, for example, a compound described in paragraphs [0108] to [0124] of the specification of JP-A-2006-199463 can be used. It is preferable to use an organic solvent in terms of a solvent used for the preparation of the optically anisotropic layer coating liquid. Examples of the organic solvent include decylamine (for example, N,N-dimethylformamide, etidamine, etc.), anthraquinone (for example, dimethyl hydrazine), and a heterocyclic compound (for example, tetrahydrofuran, a trioxolane, a 1,3-dioxolane, etc., a hydrocarbon (for example, benzene, toluene, hexane, cyclohexane, etc.), a halogenated alkyl group (for example, chloroform, dichloromethane, etc.), Ester (for example, methyl acetate, ethyl acetate, butyl acetate), ketone (for example, acetone, methyl ethyl ketone, methyl propyl ketone, methyl isobutyl ketone, cyclohexanone, etc.), ether ( For example, 1,2-dimethoxyethane, 1,3-dimethoxypropane, etc.), an alcohol (for example, methanol, ethanol, propanol 'ethylene glycol', propane-44-200922979 alcohol, etc.). Among them, it is better to use the base of the tooth and the base. It is also possible to use more than one type of organic solvent. The application of the coating liquid can be carried out by a known method (for example, a bar coating method, a direct gravure coating method, a reverse gravure coating method, a die coating method (extrusion coating method, extrusion method, slip coating method, slit coating method)). The excipient can be exemplified by the following structures: General formula (I) . Z - (X - Q ) m ί , where Ζ represents a m-valent bond group, preferably a bond other than an aromatic ring The base m represents an integer of 2 or more. X represents any one of NRa (]Ra represents a hydrogen atom, an alkyl group or an aryl group), o, and s, and the plural x may be the same or different. Q represents a heterocyclic ring or an aromatic ring. The plural Q may be the same or different. In the formula (I), Q represents a heterocyclic ring or an aromatic ring, and the plural q may be the same or different. In the case of a heterocyclic ring, the substitution of a 5 to 7 member Or unsubstituted, saturated or unsaturated, aromatic or non-aromatic 'monocyclic or condensed ring I, heterocyclic ring, preferably ring constituent atomic system selected from carbon atoms, nitrogen atoms and sulfur atoms, and nitrogen atoms, Any one of the oxygen atom and the sulfur atom has at least one hetero ring, more preferably 5 or 30 carbon atoms or 6 members An aromatic heterocyclic ring. In the case of an aromatic ring, a substituted or unsubstituted aromatic ring of 6 to 30 members is preferably a substituted or unsubstituted aromatic ring group of 5 or 6 members, more preferably a heterocyclic aromatic group. The substituents which may have a Q may, for example, be described in the specification of JP-A-2006-119605 [〇129] to [〇142丨. -45- 200922979 For the tilt angle control agent, Japan can be used. JP-A-2006-119605 discloses a compound described in the specification [〇1 7 4 ]~[0 1 9 1 ] [Fixation of alignment state of liquid crystal molecules] The liquid crystal molecules are preferably substantially uniformly aligned, It is preferable that the substantially uniform alignment state is fixed. The liquid crystal molecules are optimally fixed by a polymerization reaction in a substantially uniform alignment state. In the polymerization reaction, thermal polymerization using a thermal polymerization initiator and photopolymerization may be used. Photopolymerization of the initiator. Photopolymerization is preferred. Examples of the photopolymerization initiator are (2-carbonyl compound (described in US Pat. No. 2,376,661, the specification of each of the same.). Patent 2 No. 448,828 specification), α-hydrocarbon-substituted aromatic cryptic compound (described in the specification of U.S. Patent No. 2,72,225, 2), polynuclear ruthenium compound (described in each specification of U.S. Patent No. 3,046, 127, and No. 2,591, 758), triaryl a combination of an imidazole dimer and a p-aminophenyl ketone (described in the specification of U.S. Patent No. 3,594,736), acridine and a phenolic compound (Japanese Patent Publication No. Sho 60-105667, U.S. Patent No. 4,239,850 The description and the oxadiazole compound (described in the specification of U.S. Patent 4,229,907). The photopolymerization initiator is used in an amount of from 0.01 to 20% by weight based on the solid content of the coating liquid. /. Preferably, it is preferably 0.5 to 5% by weight. It is preferred to use ultraviolet light for the polymerization of the discotic liquid crystalline molecules to use ultraviolet rays. The irradiation energy is preferably from 20 mJ/cm 2 to 50 J/cm 2 , more preferably from 1 〇〇 to 800 mJ/cm 2 . In order to promote photopolymerization, light irradiation can also be carried out under heating conditions. -46- 200922979 The thickness of the optically anisotropic layer is preferably 0.1 to ΙΟ/zm, more preferably 0.5 to 5 #m, and most preferably 0.7 to 5 // m. However, in accordance with the mode of the liquid crystal cell, in order to obtain high optical anisotropy, the optically anisotropic layer is thickened (3 to 1 Ο μ m). The alignment state of the liquid crystal molecules in the optically anisotropic layer can be determined in accordance with the type of display mode of the liquid crystal cell as described above. The alignment state of the liquid crystal molecules is specifically controlled in accordance with the type of liquid crystal molecules, the type of alignment film, and the use of additives (for example, plasticizers, polymers, and surfactants) in the optically anisotropic layer. [Transparent Protective Film for Polarizing Plate] The polarizing plate of the present invention is composed of a polarizing film and a transparent protective film. The fact that the protective film is transparent means that the light transmittance is 80% or more. In the case of the transparent protective film, a cellulose ester film is generally used, and the above-described cellulose film is preferably used. The thickness of the transparent protective film is preferably 20 to 200/zm, more preferably 30 to 100 #m. Very good for 30~80# m. A transparent protective film is usually disposed on both sides of the polarizing film. In the present invention, it is preferable to use an optical compensation film instead of the transparent protective film on one side of the polarizing plate. That is, the optically anisotropic layer of the optical compensation film (in the case where a plurality of optically anisotropic layers are provided, which is the first optical anisotropic layer on the side of the polarizing film), is directly derived from the liquid crystal molecule on the polarizing film. Forming 'or preferably formed from a liquid crystal molecule via an alignment film. Specifically, the above-mentioned optical dissimilar layer coating liquid is applied onto the surface of the polarizing film to form an optically anisotropic layer. -47- 200922979 As a result, a transparent protective film is not used between the polarizing film and the optically anisotropic layer, but a stress (deformation X sectional area X elastic modulus) can be made with a dimensional change of the polarizing film. And a thin polarizing plate. When the polarizing plate of the present invention is mounted on a large liquid crystal display device, there is no problem such as light leakage or the like, and a screen showing a high quality is displayed. [Surface Treatment of Optical Compensation Film] In the case where an optical compensation film is used instead of the transparent protective film of the polarizing plate, the adhesion of the optical compensation film to the transparent protective film of the polarizing plate becomes a problem. In the present invention, the surface of the optical compensation film on the side of the polarizing film is surface-treated, whereby the adhesion between the optical compensation film and the polarizing film can be improved. In terms of surface treatment, corona discharge treatment, glow discharge treatment, flame treatment, ultraviolet irradiation treatment, ozone treatment, acid treatment or alkali treatment are carried out. For the treatment methods such as corona discharge treatment, glow discharge treatment, flame treatment, ultraviolet irradiation treatment, ozone treatment, acid treatment, and alkali treatment, for example, the contents described in the above-mentioned Japanese Patent Publication No. 2001-1745, pages 30 to 31. The present invention is preferably subjected to alkali treatment, and may be the same as those described in the saponification treatment of the film. [Polarizing film] The polarizing film used in the present invention is usually a polarizing film representing a coating type of Optiva, or a binder, or a polarizing film made of iodine or a dichroic dye. In the polarizing film, iodine and a dichroic dye are aligned in the binder to exhibit a bias property. Iodine and dichroic dyes are aligned along the binder molecules, or -48 - 200922979. The dichroic dyes are preferably oriented in one direction by self-organization. Now, a commercially available polarizing film is obtained by immersing a stretched polymer in a bath solution of iodine or a dichroic dye, and immersing iodine or a dichroic dye in a binder in a binder. . The commercially available polarizing film distributes iodine or a dichroic dye to about 4 μm from the surface of the polymer (the combination of both sides is about 8/zm), and in order to obtain sufficient polarizing performance, a thickness of at least 1 〇V m is necessary. . The degree of soaking can be controlled by the concentration of the solution of iodine or a dichroic pigment, the temperature of the bath, and the immersion time. As described above, the lower limit of the thickness of the adhesive is preferably 1 Ο # m. The upper limit of the thickness is, as far as the light leakage of the liquid crystal display device is concerned, the thinner the better. It is preferably a commercially available polarizing plate (about 30/m) or less, preferably 25/m or less, and more preferably 20 μm or less. If it is 20/m or less, the light leakage phenomenon is preferably not observed by a liquid crystal display device of 17 inches. The adhesive of the polarizing film may be crosslinked. For cross-linking adhesives, polymers which are crosslinkable by themselves can be used. A polymer having a functional group or a binder obtained by introducing a functional group into a polymer can form a polarizing film by reacting between the binders by light, heat or p Η. Further, the crosslinked structure can be introduced into the polymer by a crosslinking agent. Cross-linking is generally carried out by applying a coating liquid containing a polymer or a mixture of a polymer and a crosslinking agent onto a transparent support. It is preferable to ensure durability at the final stage of the product, so that the crosslinking treatment can be carried out at any stage until the final polarizing plate is obtained. -49- 200922979 The adhesive for the polarizing film may be any one of a polymer which is itself a crosslinkable polymer or crosslinked by a crosslinking agent. Examples of the polymer include the same ones as those described for the alignment film. Among them, polyvinyl alcohol and modified polyvinyl alcohol are preferred. As the modified polyvinyl alcohol, a compound described in each of the publications of JP-A No. Hei 8-3389, No. Hei. Further, polyvinyl alcohol and modified polyvinyl alcohol may be used in combination of two or more kinds. The amount of the crosslinking agent added by the binder is preferably from 1 to 20% by weight based on the binder. The alignment of the polarizing element and the moist heat resistance of the polarizing film are good. The alignment film contains a certain degree of non-reactive crosslinking agent even after completion of the crosslinking reaction. However, the amount of the remaining crosslinking agent is preferably 1.0% by weight or less in the alignment film, more preferably 0.5% by weight or less. In this way, when the polarizing film is assembled in the liquid crystal display device and is left for a long period of time or in an atmosphere of high temperature and high humidity, the degree of polarization is not lowered. The cross-linking agent can be exemplified by the specification of U.S. Reissue Patent No. 23297. Further, a boron compound (for example, boric acid or borax) can also be used as a crosslinking agent. As the dichroic dye, an azo dye, a stilbene dye, a pyrazoline dye, a triphenylmethane dye, a quinoline dye, an odorant dye, a thiodend dye or a guanidine system can be used. pigment. The dichroic dye is preferably water soluble. The dichroic dye preferably has a hydrophilic substituent (for example, a sulfo group, an amine group, or a hydroxyl group). Examples of the dichroic dye include, for example, the compounds described in the Inventor's Association Technical Bulletin, Public Technology No. 2001-1745, p. 58 (issued March 15, 2001). -50- 200922979 In order to improve the contrast ratio of the liquid crystal display device, the transmittance of the polarizing plate is preferably higher, and the polarizing degree is preferably higher. The transmittance of the polarizing plate is preferably in the range of 30 to 50% in the light having a wavelength of 550 nm, more preferably in the range of 35 to 50%, and most preferably in the range of 40 to 50%. The degree of polarization is preferably in the range of 90 to 100% in the light having a wavelength of 550 nm, more preferably in the range of 95 to 100%, and most preferably in the range of 99 to 100%. The polarizing film and the optically anisotropic layer, or the polarizing film and the alignment film, are also possible by the arrangement of the adhesive. As the binder, a polyvinyl alcohol-based resin (modified polyvinyl alcohol containing an ethyl acetate, a sulfonic acid group, a carboxyl group or an oxyalkylene group) or an aqueous solution of a boron compound can be used. A polyvinyl alcohol resin is preferred. The thickness of the adhesive layer is preferably in the range of 0.01 to 10/m after drying, and particularly preferably in the range of 0.05 to 5/zm. [Production of Polarizing Plate] The polarizing film is stretched (stretching method) by stretching the adhesive 10 to 80 degrees with respect to the longitudinal direction (MD direction) of the polarizing film from the viewpoint of productivity, or After honing (honing method), it is preferred to dye with iodine or a dichroic dye. The inclination angle is preferably such that the transmission axes of the two polarizing plates bonded to both sides of the liquid crystal cell constituting the LC D are aligned with the longitudinal or transverse directions of the liquid crystal cells. The usual tilt angle is 45. . However, recently, the transmissive, reflective, and transflective LCDs are not necessarily 45. The device has been developed in such a way that the stretching direction can be arbitrarily adjusted in accordance with the design of L C D . In the case of the stretching method, the stretching ratio is preferably from 2 · 5 to 3 0.0 times, and more preferably from 3 〇 to 10 〇. Stretching can be carried out under dry stretching in air. Further, -51 - 200922979 can also be wet-stretched while being immersed in water. The stretching ratio of the dry stretching is preferably 2·5 to 5·0 times, and the stretching ratio of the wet stretching is preferably 3·0 to 1 〇. 〇 times. The stretching step may be carried out by fractional stretching. Under the fractional order, even if it is stretched at a high magnification, it can be stretched more uniformly. It is also possible to perform a plurality of stretching in the horizontal or vertical direction (preventing the degree of shrinkage in the width direction) before the oblique stretching. The stretching is carried out in the biaxial stretching so that the tenter stretching is carried out in the right and left different steps. The above biaxial stretching is the same as the stretching method performed in the film formation of a usual film. In the biaxial stretching, since the stretching is performed at a speed different from left to right, the thickness of the adhesive film before stretching needs to be different from left to right. In the cast film formation, the taper is applied to the mold, and the flow rate of the adhesive solution can be caused to vary. As described above, an adhesive film which is obliquely stretched from 1 Torr to 8 Torr in the M D direction of the polarizing film can be produced. The so-called honing method can be applied to the honing treatment method widely used in the liquid crystal alignment processing step of LC D. That is, the surface of the film is made of paper or gauze, felt, rubber or nylon or polyester fiber, and is aligned by friction in a certain direction. In general, it is carried out by using a fiber having a uniform length and thickness and arranging the cloth for an average of several times. It is preferable to use a honing roll having a roundness, a cylinder degree, and a oscillating weight (eccentricity) of the roller itself of 30 # m or less. The film honing angle of the honing roll is preferably from 0.1 to 90°. However, as described in Japanese Laid-Open Patent Publication No. Hei 8-160430, a honing process can be obtained by winding 360° or more. -52- 200922979 In the case of honing treatment of a long film, it is preferable to carry the film at a speed of 1 to 100 m/min under a certain tension by a conveyance device. The honing roller is preferably set at any honing angle, so that it is preferable to rotate in the horizontal direction with respect to the film. In the range of 〇~60°, it is preferable to select a suitable honing angle. In the case of using a liquid crystal display device, it is preferably 40 to 50°. It is especially good at 45°. It is preferable to arrange the transparent protective film (the arrangement of the optical anisotropic layer/polarizing film/transparent protective film) on the surface opposite to the optically anisotropic layer of the polarizing film. The transparent protective film is preferably an antireflection film having its outermost surface to have antifouling properties and scratch resistance. As the antireflection film, any of the well-known ones can be used. As described above, the polarizing plate of the present invention can be produced. The optical compensation film of the present invention or a polarizing plate using the optical compensation film, a liquid crystal display device, particularly a transmissive liquid crystal display device, can be advantageously used. Hereinafter, a liquid crystal display device, particularly a transmissive liquid crystal display device and its manufacture will be described in detail. [Liquid crystal display device] The transmissive liquid crystal display device of the present invention comprises a liquid crystal cell and two polarizing plates disposed on both sides thereof. The liquid crystal cell carries liquid crystal between the two electrode substrates. The optical compensation film is disposed between the liquid crystal cell and one of the polarizing plates, or two pieces are disposed between the liquid crystal cell and the polarizing plates of both. A preferred form of the optically anisotropic layer can be arbitrarily set in each liquid crystal mode. [Polarizing Plate with Anti-Reflection Film] -53- 200922979 The polarizing plate of the present invention is preferably provided with an anti-reflection film on the surface of the protective film of the polarizing film on the air side. Thereby, the glare of the external light can be significantly reduced or eliminated, and it can be a vivid display. The anti-reflection film may be directly disposed on the protective film of the polarizing film, or the anti-reflection film of the anti-reflection film may be adhered to the polarizing film protective film on the transparent support. Because of the thinning of the polarizing plate, the former is better. [Anti-reflection film] The anti-reflection film is generally a low refractive index layer which is also an antifouling layer, and a layer having at least one higher refractive index than the low refractive index layer (that is, a high refractive index layer, medium The refractive index layer is formed on a transparent support. In the method of forming the antireflection film, there is a method of laminating a transparent film of an inorganic compound (metal oxide or the like) having a different refractive index to form a multilayer film; by chemical vapor deposition (CVD) or physical vapor deposition (PVD) a method of forming a film; forming a colloidal metal oxide particle film by a sol/gel method of a metal compound such as a metal alkoxide, followed by post-treatment (ultraviolet irradiation: Japanese Patent Laid-Open Publication No. Hei 9-157-85. Plasma treatment: Japanese Laid-Open Patent Publication No. 2 002-32 73 No. 10, a method of forming a film, and the like. Further, in terms of a method for forming an antireflection film having high productivity, various proposals have been made for a method of dispersing inorganic particles in a film composition formed by a matrix to form an antireflection film. Further, an anti-reflection film which is applied by coating as described above and an anti-glare anti-reflection film having a fine uneven shape on the surface of the uppermost layer may be used. [Examples] The substantial effects of the present invention will be described below based on examples, but the present invention is not limited thereto. -54 - 200922979 In the present embodiment, as a material of the optical compensation film, first, a material of the support is made of a cellulose triacetate film (manufactured by Fujifilm Co., Ltd.) to produce a support. Then, an optical compensation film was produced by using a modified polyvinyl alcohol as a material on the support film on the support. Table 1 shows the number of bright spots relative to the film surface temperature, the degree of crystallization, the honing work, and the optical compensation film produced, in the examples (1 to 18) and the comparative examples (1 to 4) of the present invention. The evaluation of the alignment characteristics is summarized as one. In Examples 1 to 12 and Comparative Examples 1 and 2, the amount of honing was set to 600 Nm/m2. The film surface temperature was changed to 15. 〇~145. (: The crystallinity was changed to Ο·1 to 0·9 in accordance with the film surface temperature. In Example 1 3 to 1 8 and Comparative Example 3, 4', the film surface temperature was 8 51. As a result, crystallization The degree is 0.3. The working amount of the honing is changed to 200 to 900 Nm/m2, and the film surface temperature is changed to 15 ° C to 1 4 5 ° C. The degree of crystallization corresponding to the film surface temperature is changed to 0.1 to 0.9. The number of bright spots (number / m) below 5 0 # m is evaluated by the number. The number of 100 or more is X, and 60 or more ~ less than 1 is 〇 'lower than 6 0 The evaluation of the aligning film was carried out by observing the extinction degree. When the product was not allowed, the product was not allowed to be X 'allowable 〇', and if it was good, it was evaluated as ◎. Here, the term "extinction degree" means "the degree of extinction of the optical compensation film of the present invention, and the optical compensation film of the present invention is disposed between the two polarizing plates disposed in the crossed Nicols to minimize the transmittance. Transmittance measured at a time. Transmittance is measured at a wavelength of 550 nm, parallel to the para-nicol (para_nicol) configuration of the polarizing plate The transmittance is 100%", and the highlight of the optical compensation film is -55-200922979, that is, it indicates the degree of light leakage accompanying the misalignment of the liquid crystal compound. That is, the person who monitors the extinction is observed near the final product. In Comparative Example 1, the film surface temperature was 15 ° C, and the degree of crystallization was 〇·1. The evaluation of the number of bright spots was ◦, but the alignment film was not dried, so the evaluation of the alignment film was X. On the other hand, in Comparative Example 2, the film surface temperature was 145 ° C. The degree of crystallization was 0.9. The degree of crystallization was high, so it was estimated that the alignment film was hard and brittle. The aligning film was subjected to honing treatment, so dust The amount of occurrence was large, and the number of bright spots was evaluated as X. In Examples 6 to 9, the film surface temperature was 75 ° C to 1 〇 5 t, and the degree of crystallization was 0.2 to 0.5'. The honing workload was 6 〇 ONm / M2. In Examples 6 to 9, the number of bright spots and the characteristics of the alignment film were evaluated as ◎. In Comparative Example 3, since the honing work amount was 200 Nm/m 2 , the regulation force imparted to the alignment film became weak. The evaluation is X. On the other hand, in Comparative Example 4, the amount of honing work is 9〇〇Nm/m2, so As a result of the film becoming more intense, the amount of 麈 变 increased, and the number of bright spots was evaluated as X. In Example 1 5 to 127, the film surface temperature was 85 ° C, and the degree of crystallization was 0.3, 硏The grinding work was 5 〇〇 7 7 Nm/m 2 . In Examples 15 to 17, the number of defects and the characteristics of the alignment film were evaluated as ◎ -56- 200922979 Table 1 Crystallization degree of film surface honing Workload Highlights Number of Alignment Membrane Properties (°C) — Nm/m2 / m (extinction) Comparative Example 1 15 0.1 600 〇X Example 1 25 0.2 600 〇〇Example 2 35 0.2 600 〇〇Example 3 45 0.2 600 〇〇 Example 4 55 0.2 600 〇〇 Example 5 65 0.2 600 〇〇 film surface temperature change Example 6 75 0.2 600 〇〇 Example 7 85 0.3 600 ◎ ◎ Example 8 95 0.4 600 ◎ ◎ Implementation Example 9 105 0.5 600 ◎ ◎ Example 1 〇 115 0.6 600 〇 ◎ Example 11 125 0.7 600 〇 ◎ Example 12 135 0.8 600 〇〇 Comparative Example 2 145 0.9 600 X , 〇 Comparative Example 3 85 0.3 200 ◎ X Implementation Example 13 85 0.3 300 ◎ 〇 Example 14 85 0.3 400 ◎ honing Example 15 85 0.3 500 ◎ ◎ Change Example 16 85 0.3 600 ◎ ◎ Example 17 85 0.3 700 ◎ ◎ Example 18 85 0.3 800 〇 ◎ Comparative Example 3 85 0.3 900 X ◎ *1 : Reduced drying period The maximum film surface temperature (solid content concentration: 80% by weight or more) is shown in Table 1. (1) An alignment film having a crystallinity of 0.2 to 0.8 as measured by the AT R / IR method is formed, and (2) alignment is performed. The film is honed at a working amount of 300 to 800 Nm/m 2 to suppress the amount of dust generated. As a result, the bright spot defects can be reduced, and the alignment regulating force of the alignment film can be improved. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic diagram showing the entire manufacturing method of an optical compensation film. -57- 200922979 Fig. 2 is a schematic view showing the coating step of the alignment film forming method and the drying and effect steps. Fig. 3 is an explanatory diagram showing a method of calculating the workload. Fig. 4 is an enlarged view of the main part of the honing processing apparatus. Fig. 5 is a graph showing the relationship between the film surface temperature and the number of bright spots, the film surface temperature and the amount of dust generated, and the film surface temperature and the degree of crystallization. [Description of main components] 1 Long roller la mesh layer 2 Feeder 3 Guide roller 4 Dust collector 5 Coater 6 Drying device 7 Guide roller 8 Honing treatment device 9 Surface dust collector 10 Coating machine 11 Heating area 12 Ultraviolet ( UV) lamp 13 inspection device 14 protective film 15 laminating machine 16' winding device - 58 - 200922979 17 feeding machine 6 1 drying lop field 62 drying air generating means 63 exhausting means 64 heating means 65 drying air control means f - 59

Claims (1)

200922979 X. Patent Application Range: 1. A method for producing an optical compensation film, comprising: (a) a supporting body during traveling, coated with at least a polymer and a hardening compound for curing the polymer in organic a coating liquid of a solvent solvent to form a coating film, (b) drying and hardening the coating film to form an alignment film having a degree of crystallization of 2 to 0.8 as measured by an ATR/IR method, a hardening step, (c) a step of honing the alignment film at a work load of 300 to 800 Nm/m 2 , and (d) a step of forming a liquid crystal layer on the alignment film by honing . 2. The method of producing an optical compensation film according to the first aspect of the invention, wherein the drying and hardening step comprises a first step of performing constant rate of drying and a second step of performing deceleration drying, the second step The maximum film surface temperature of the coating film in the step is 25 t to 135. (3) The method for producing an optical compensation film according to the second aspect of the invention, wherein the concentration of the solid component in the coating film in the second step is 80% or more. 4. Patent Application Nos. 1 to 3 The method for producing an optical compensation film according to any one of the preceding claims, wherein the curing compound contains at least one of a monomer having two or more crosslinkable reactive groups. 5 _ as in any one of claims 1 to 4 The method for producing an optical compensation film of the item 'wherein the support system block 値(Re値) is a transparent support of 〇~2〇〇rim. -60- 200922979 6. As claimed in any of claims 1 to 5 The method for producing an optical compensation film, wherein the polymer contains a composition for forming an alignment film of a polyvinyl alcohol and/or a modified polyvinyl alcohol as a main component. 7 · As in the fourth to sixth claims In the method for producing an optical compensation film, the monomer having the two or more crosslinking reactive groups is an aldehyde compound having two or more aldehyde groups. The optical compensation film is characterized by Any of the patent scopes 1 to 7 The manufacturer of the method is a polarizing plate characterized by containing an optical compensation film according to item 8 of the patent application. 10. A liquid crystal display device characterized by containing polarized light as in claim 9 Board. -61 -