TW201030075A - Optical film and polarizing plate using the optical film - Google Patents

Abstract

Disclosed is an optical film that has high moisture permeability even after stretching at a high ratio, can improve resistance to heat and moisture of a polarizer when the optical film is used as a polarizing plate protecting film, and, at the same time, has an improved change in mass of the film after exposure to moist heat conditions and has a high front contrast by virtue of the suppression of turbulence of molecular alignment of additives and cellulose even when the film is further stretched at a high ratio. Also disclosed is a polarizing plate using the optical film. The optical film comprises at least a polyester compound represented by general formula (1) and a cellulose ester and is characterized in that the modulus of elasticity of the optical film as measured in an environment of 23 DEG C and 55%RH is 3.4 to 7.0 GPA in both the longitudinal direction (MD) of the film and the width direction (TD) of the film and TD modulus of elasticity/MD modulus of elasticity = 1.05 to 2.0. General formula (1) B-(G-A)n-G-B

Description

201030075 VI. Description of the Invention: [Technical Field of the Invention] The present invention relates to an optical film and a polarizing plate using the same. [Prior Art] In recent years, the popularity of liquid crystal displays for automobiles, displays for large-sized LCD TVs, mobile phones, and notebook computers has increased the demand for liquid crystal display devices φ (hereinafter, simply referred to as LCDs). In the liquid crystal display device, various optical films such as a polarizing film or a retardation film are used. Due to the increasing demand for LCDs, polarizing plates used in conjunction with them are also required to be thinned, lightweight, and mass-produced. In addition, with the increase of the LCD screen, the optical film of the material is also thinned and mass-produced, and the width is required to be widened. The characteristics of the lifting film focusing on physical properties such as mechanical strength are discussed. It is also expanding rapidly. However, when the film is formed, the moisture permeability of the film increases, and when the optical film is used as a polarizing plate protective film or the like, the problem of deterioration of the polarizer is likely to occur under high temperature and high humidity conditions. Therefore, there is a report on the addition of a plasticizer to an optical film to suppress moisture permeability (for example, refer to Patent Documents 1 to 3). When the above optical film is produced, the film thickness or film width of the resulting film is adjusted for optical characteristics or planarity, and is usually adjusted by stretching the tenter after film formation. The optical film is stretched at a high magnification, and it is expected to be wide-width and thinned. Especially when producing a wide-width optical film of more than 1.6 m, the technology for improving the moisture permeability of 201030075 is insufficient, and it is found at a high temperature. Under conditions of high humidity, problems such as deterioration of the polarizer or volatilization of the plasticizer, easy bleed out, and easy change in the quality of the film may occur. Further, when a polarizing plate using the optical film as a constituent material is mounted on a liquid crystal display device, the elongation of the high magnification tends to cause disorder of the cellulose orientation, and there is a problem that the front contrast is lowered. CITATION LIST Patent Literature Patent Literature 1: JP-A-2008-69225 Patent Document 2: JP-A-2008-88292 (Patent Document 3) DISCLOSURE OF THE INVENTION PROBLEM TO BE SOLVED BY THE INVENTION An object of the present invention is to provide an excellent moisture permeability even when extended at a high magnification, and to improve the heat and humidity resistance of a polarizer when used as a protective film for a polarizing plate, and also after moist heat conditions It has an excellent quality change of the film, and when it is extended at a high magnification, it can use an additive and a disorder of molecular orientation of cellulose, and an optical film excellent in frontal contrast and a polarizing plate using the optical film. Means for Solving the Problems The above problems of the present invention are solved by the following methods. -6- 201030075 1. An optical film containing at least one of the following compound esters of the formula (1), which has an elastic modulus measured at 23 ° C and 55% RH in the film length direction ( MD) and thin direction (TD) are optical films characterized by a 3.4 GPA or higher and a 7.0 GPA range/MD elastic modulus = 1.05 to 2.0.

General formula (1) B-(GA)nGB (wherein B represents a benzene monocarboxylic acid residue, and G represents an aromatic diol residue having a carbon number of 2 to φ diol or a carbon number of 6 to 12 or The carbon number is 4 oxyalkylene glycol residues, and A represents an alkylene residue having a carbon number of 4 to 12 or an aryl dicarboxylic acid residue having a carbon number of 6 to 12, and n is a number. 2. The optical film described in the above item is characterized in that the optical film has a width of 1.6 to 4 m and a film of 1.07 to 2.0 times in at least one direction of the (MD) film width direction (TD). A polarizing plate characterized by using the above-mentioned 1 or 2 optical films of φ is used on at least one side. Advantageous Effects of Invention According to the present invention, it is possible to provide a high-magnification extension and an excellent wettability, and as a polarizing plate protective film, the photon heat can be improved, and the film quality can be improved at a high rate after moist heat conditions. When extending, the optical film which is excellent in frontal contrast can be obtained by the additive and the molecular disorder which inhibits cellulose, and the optical polarizing plate is used. 'and the environmental film width of the fiber, the whole length of the TD 12 alkane to 12 dicarboxylic acid is extended to L 〇 the difference between the moisture resistance and the more oriented film 201030075. The best mode for the invention is as follows, but the invention is not limited to the scope of the embodiments. The optical film of the present invention is an optical film comprising at least the compound of the above formula (1) and a cellulose ester, characterized in that the optical film is measured at 23 ° C, 55% RH ambient temperature of the optical film. The elastic modulus of the film is in the range of 3.4 GPA or more and 7.0 GPA or less in the film length direction (MD) and the film width direction (TD), and the TD modulus/MD φ modulus of elasticity = 1.05 to 2.0. The width of the optical film is such that the productivity is increased, and when the width is increased by 1.6 m or more with a high-magnification extension operation, problems that have not been common in the past occur. For example, the moisture permeability is deteriorated under high-temperature and high-humidity conditions, and the function of protecting the film as a polarizing plate is lowered, and deterioration of photons is easily performed. Further, when the optical film is used as a polarizing plate protective film and is mounted on a liquid crystal display device as a polarizing plate, the orientation of the optical film caused by the stretching is disordered, and the frontal contrast is lowered. @ The present inventors have intensively studied the results of the above-mentioned problems, and found that the optical film of cellulose ester has the compound of the above general formula (1), and the length direction (MD) and width of the film are extended by the stretching operation. The elastic modulus of the direction (TD) is controlled in a specific range, and it can be extended at a high magnification and has excellent moisture permeability. When used as a polarizing plate protective film, the heat resistance of the polarizer can be improved', and the film is excellent after moist heat conditions. The quality change, and the elongation of the high magnification is also achieved by the additive and the disordered 'positive contrasting optical film of the molecular orientation of the cellulose. -8 - 201030075 The present invention is described in detail as follows: "Elastity" The elastic modulus, also known as the tensile modulus, is based on ISO 52*7-3, a tensile testing machine for products manufactured by the Seiki Seiki Co., Ltd. under conditions of 23 t. In the tensile test, the two squareness ratios of the longitudinal direction of the film (hereinafter referred to as φ direction) and the width direction (hereinafter referred to as TD direction) were determined by the 1 〇% strain strength data. Adjust the range above 3.4GPA (23 ° C, 5 5% RH ambient conditions) and below 7.0 GPA, and make the TD elastic modulus / MD = 1.0 5 ~ 2.0 range, it is necessary to make the τ D direction elastic modulus higher than MD rate. The adjustment of the modulus of elasticity in the above range can be achieved by the compound of the above-mentioned 1) and by the stretching operation. The modulus of elasticity is a physical property which is not easily deformed. According to the results of the present invention, the preparation method or formula is changed, and the elastic modulus is controlled by the extension operation, and the water content of the optical film containing the cellulose ester is regulated. Therefore, in a specific range, the polarizing plate is less likely to be deteriorated, and the film quality is not easily changed under wet heat conditions. In addition, when the elastic modulus range, the polarizing plate itself is not easily deformed or deformed by the shaft, and the stability of the extending operation can be improved, and the fracture can be avoided, and the range of 3.4 GPA or more and 4.5 GPA or less is preferable. "The compound of general formula (1)" is used to measure the elastic modulus in the direction of the spring with 55% R Η 〇 MD. (After studying the elastic modulus, the specific rate of contrast is also -9. - 201030075 The compound of the general formula (1) is a polyester plasticizer, and more specifically, it is an aromatic terminal ester plasticizer.

General formula (1) B-(GA) nGB (wherein B represents a benzene monocarboxylic acid residue, G represents an alkanediol residue having a carbon number of 2 to 12 or an aromatic diol residue having a carbon number of 6 to 12 The oxyalkylene glycol residue having a carbon number of 4 to 12' A represents an alkylenedicarboxylic acid residue having a carbon number of 4 to 12 or an aryl dicarboxylic acid residue having a carbon number of 6 to 12 , again, n indicates an integer of 1 or more). The general formula (1) is represented by a benzene monocarboxylic acid residue and an alkylene glycol residue or an oxyalkylene glycol residue or an aromatic diol residue represented by G. It is composed of an acid residue or an aryl dicarboxylic acid residue and is reacted in the same manner as a general polyester plasticizer. In the present invention, a benzene monocarboxylic acid component of a polyester plasticizer such as benzoic acid, p-t-butylbenzoic acid, o-toluic acid, m-toluic acid, p-toluic acid, or xylenecarboxylic acid may be used. Ethyl benzoic acid, n-propyl benzoic acid, amino benzoic acid, ethoxy benzoic acid, and the like may be used alone or in combination of two or more. The polyester-based plasticizer which can be used in the present invention has an alkanediol component having a carbon number of 2 to 12, such as ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, hydrazine, 2-butanediol. , 1,3-butanediol, 1,2-propanediol, 2-methyl-1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 2,2-dimethyl- 1,3-propanediol (neopentyl glycol), 2,2-diethyl-1,3-propanediol (3,3-dimethylolpentan), 2-n-butyl-2-ethyl-1 , 3-propanediol (3,3-dimethylol heptane), 3-methyl-1,5-pentanediol, 1,6-hexanediol, 2,2,4-trimethyl-1, 3-pentalol, 2-B-201030075-based-1,3-hexanol, 2-methyl-1,8-octanediol, 1,9-nonanediol, ι, ι〇-nonanediol, The above diols such as 1,12-octadecadiol or the like may be used singly or in combination of two or more kinds. Among them, it is preferable that the mutual solubility of the diol and the cellulose ester having a carbon number of 2 to 12 is excellent. Further, the above-mentioned aromatic terminal ester has an alkylene oxide component having a carbon number of 4 to 12, such as diethylene glycol, triethylene glycol, tetraethylene glycol, dipropylene glycol, tripropylene glycol, or the like. It can be used alone or in combination of two or more as the mixture φ. The aromatic terminal ester has a carbon number of 4 to 12, such as succinic acid, maleic acid, fumaric acid, glutaric acid, adipic acid, azelaic acid, sebacic acid, and twelve The alkanoic acid or the like may be used singly or in combination of two or more kinds. The aryl diacid component having 6 to 12 carbon atoms is phthalic acid, terephthalic acid, isophthalic acid, hydrazine, 5-naphthalene dicarboxylic acid, 1,4-naphthalenedicarboxylic acid or the like. The polyester plasticizer used in the present invention preferably has a number average molecular weight of from 300 to 1,500, more preferably from 400 to 1 Torr. Further, the acid hydrazine is preferably 〇5 mgKOH/g or less, and the hydroxyl group value is 25 mg K〇H/g or less, wherein the acid hydrazine is preferably 〇3 mgKOH/g or less, and the hydroxy group is 15 mgKOH/g or less. The synthesis of the aromatic terminal ester plasticizer which can be used in the present invention is exemplified below. <Sample No. 1 (aromatic terminal ester sample)> 410 parts of phthalic acid, 61 parts of benzophenone-11 - 201030075 acid, 737 t were placed in the reaction bar, under nitrogen reflux, J reaction to acid 1.33 x1 01P treatment, most: agent. Viscosity 値 値 < test) Reaction ί, 341 parts: , according to; end ester. Viscosity acidity <test, reaction; 4 1 8 parts; ί, all aromatic end i viscosity J propylene glycol and 〇·40 parts of catalyst mixed with tetraisopropyl phthalate A reflux condenser was installed to make excess one of the alcohols at 1 3 0 to 2 50. (: continue to heat 'continuously remove the water produced, and the enthalpy is 2 or less. Then, under 20 〇 to 23 0 'reduced from a to the last 4 x 1 〇 2 Pa or less under reduced pressure', the filtrate has the following The aromatic terminal ester of the trait is plasticized (25., m P a · s ) : 43400 : 0.2 Νο·2 (aromatic terminal ester sample) > 410 parts of phthalic acid, 610 parts are used. Ethylene benzoate and 0.35 parts of the catalyst were prepared in the same manner as tetraisopropyl titanate excipient No. 1 to obtain an aromatic (25 〇C, mPa · s) having the following properties: 3 1 〇〇〇 :0.1

-12- 1 Ν〇·3 (aromatic terminal ester sample)&gt; 41 parts of phthalic acid, 61 parts of benzoic acid-1,2-propanediol and 〇.35 parts of catalyst were used. The same method as in tetraisopropyl titanate female sample No. 1 was used to prepare vinegar having the following properties. (25 C, mPa · s ) : 3 8 000 201030075 Acid strontium: (K05 <sample Ν0·4 (aromatic terminal ester sample)&gt; 410 parts of phthalic acid, 61 parts of benzoic acid were used in the reaction vessel , 418 parts of 1,3-propanediol and 035 parts of catalyst for tetraisopropyl titanate were prepared according to the same method as in the sample Ν 1. 1 to obtain an aromatic terminal ester having the following properties. Viscosity (25°) C, mPa·s) : 37000 Acid hydrazine: 0.05 Specific examples of the aromatic terminal ester plasticizer which can be used in the present invention are exemplified below, but the present invention is not limited to the scope of the invention.

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{E "y-ooo-*HoHo-oJ:oo ^ «10CTOOOINxoxrrouAU s I-- 8O5N5OO0-0005-5000-^&quot;&quot;^- OOOIX0WIOOOO 5- 光学 The optical film contains 1 to 35 mass% of the above compound Preferably, it is preferably contained in an amount of 5 to 30% by mass. When it is contained in the above range, the excellent effects of the present invention can be exhibited, and it is preferable that the raw material is not exuded. "Cellulose Ester" The cellulose ester to be used in the optical film of the present invention is not particularly limited, and is a cellulose ester composed of a carboxylate having a carbon number of from 2 to 22, and may be an -15-201030075 aromatic carboxy group. The acid esters, especially the lower fatty acid esters of cellulose, are preferred. The lower fatty acid in the lower fatty acid ester of cellulose means a fatty acid having 6 or less carbon atoms. The thiol group bonded to the hydroxyl group may be linear, fluorene, or cyclic. More may have other substituents. When the degree of substitution is the same, the carbon number is increased and the birefringence is lowered. Therefore, it is preferred to select the carbon number in the fluorenyl group having 2 to 6 carbon atoms. The above cellulose vinegar preferably has a carbon number of 2 to 4, and more preferably a carbon number of 2 to 3. The above cellulose ester may also be a thiol group derived from a mixed acid, and particularly preferably a fluorenyl group having 2 to 3 carbon atoms or a fluorenyl group having 2 to 4 carbon atoms. The cellulose ester in the present invention may be a cellulose acetate propionate, a cellulose acetate butyrate, or a cellulose acetate propionate butyrate or the like, or a combination may be used. A mixed fatty acid ester of cellulose having a propionate group or a butyrate group. Further, the butyl group forming the butyrate may be linear or fluorene. Among the cellulose esters suitable for use in the present invention, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate, cellulose acetate phthalate, etc. are especially used. It is preferred to be a cellulose ester. Further, the retardation can be controlled by the kind of the above mercapto group of the cellulose ester and the degree of substitution of the mercapto group on the pyranose ring of the cellulose resin structure. The preferred cellulose ester in the present invention is required to satisfy the conditions of the following formulas (1) and (2) at the same time. Formula (1) 2.0 S X + Y S 3.0 Formula (2) 0 ^ Y ^ 1.5 wherein X represents the degree of substitution of the ethyl group, and Y represents the degree of substitution of the propyl group or the butyl group. A film having physical and optical properties superior to those of the above-mentioned formula, which can satisfy the object of the present invention. Among them, triacetyl cellulose and cellulose acetate propionate are preferred. The cellulose acetate propionate is preferably 1.0 SXS 2.5, 0.1 SYS 1.5, 2.0 S X + YS 3.0. The method for determining the degree of substitution of the thiol group is carried out in accordance with ASTM-D817-96. When the degree of substitution of the above mercapto group is too low, the unreacted portion of the hydroxyl group on the pyranose ring constituting the structure of the cellulose resin increases, and the residual of the hydroxyl group φ is excessive, causing a change in the humidity of the blocker or the like. It is not suitable for the risk of reducing the ability of the polarizing plate protection film to protect the polarizer. The ratio of the weight average molecular weight (Mw) and the number average molecular weight (??) of the cellulose ester of the present invention, i.e., Mw/Mn? is preferably 1.4 to 3.0. Further, in the present invention, the cellulose ester film may be a cellulose ester having a Mw/Mn値 of 1.4 to 3.0, and the cellulose ester (preferably cellulose triacetate) contained in the film. The overall Mw/Mn値 of the ester or cellulose acetate propionate is preferably in the range of from 1.4 to 3.0, more preferably from 1.7 to 2.2 φ. The molecular weight of the cellulose ester used in the optical film of the present invention is preferably in the range of from 80000 to 200,000 in terms of a number average molecular weight (??). Among them, 100000 to 200,000 is more preferable, and particularly preferably 150,000 to 200,000 is preferable. The average molecular weight and molecular weight distribution of the cellulose ester can be measured by a known method using a high-speed liquid chromatograph. Thus, the number average molecular weight and the weight average molecular weight were calculated to obtain the ratio (Mw / Μη). High speed liquid chromatography was carried out according to the following conditions. -17- 201030075 Solvent: Dichloromethane Separation tube: Shodex K806, K805, K803G (Showa Electric Co., Ltd., used in conjunction with 3)

Separation tube temperature: 2 5 °C Sample concentration: 〇. 1 mass. /〇Detector: RI 504 (product of GL Scientific) Pump: L6000 (product of Hitachi, Ltd.) Flow: l.Otnl/min Calibration curve: using standard polystyrene STK standard polystyrene (Dongcao) (Company) company product) The calibration curve obtained by using 13 samples between Mw=l, 〇〇〇, 〇0〇~5 00 is obtained. It is better to use the 13 samples almost equally. The cellulose used for the raw material of the cellulose ester used in the present invention is not particularly limited, and wood pulp (conifer pulp, hardwood pulp) or cotton linter can be used. The Mw of the cellulose ester can be adjusted by selecting the type of cellulose or using a plurality of raw materials of cellulose. For example, when esterified with a broad-leaved pre-hydrolyzed kraft paddle, the Mw of the cellulose ester becomes large, and Mw is easily reduced when esterified with coniferous sulfite pulp. Therefore, cellulose may be used singly or in combination of two or more kinds. For example, conifer pulp and cotton linter or hardwood pulp can be used. Cellulose typically uses more pulp (especially conifer pulp). Also, the ct-cellulose content (% by mass) of cellulose is usually in the range of 94 to 99% (for example, 9 5 to 9 9 %), wherein 9 6 to 9 8.5 % (for example, 9 7 · 3 to 9 8 %) It is better. The present invention relates to a cellulose ester. When the acidifying agent for the cellulose raw material is an acid-18-201030075 anhydride (for example, acetic anhydride, propionic anhydride, butyric anhydride), an organic acid such as acetic acid or an organic solvent such as dichloromethane is used as the sulfuric acid. The reaction is carried out by a protonic catalyst. When the oxime agent is a ruthenium chloride (e.g., acetamidine chloride, acenaphthyl chloride, or ruthenium chloride), a basic compound such as an amine is used as a catalyst to carry out the reaction. Specifically, it can be synthesized by the method described in Japanese Laid-Open Patent Publication No. Hei-45804. The average degree of substitution of the fluorenyl group φ at the 6-position of the glucose unit of the cellulose ester used in the present invention is preferably in the range of 0.5 to 0.9. In the 6-position of the glucose unit constituting the cellulose ester, unlike the 2-position and the 3-position, there is a highly reactive first-order hydroxyl group in the production process of the cellulose ester using sulfuric acid as a catalyst. The sulfate is preferentially formed. Therefore, in the esterification reaction of cellulose, by increasing the amount of sulfuric acid of the catalyst, compared with the general cellulose ester, comparing the 6-position of the glucose unit, the average substitution degree at the 2-position and the 3-position can be improved. . Further, when necessary, when the tritylation of cellulose is carried out, the hydroxyl group at the 6-position of the glucose unit φ can be selectively protected, so that the hydroxyl group at the 6-position is protected by tritylation, after esterification. The removal of the trityl group of the protecting group can increase the average degree of substitution of the 2-position and the 3-position more than the 6-position of the glucose unit. Specifically, a cellulose ester produced by the method described in JP-A No. 20-28 1 645 is preferably used. In the case of acetaminophen, in order to increase the acetylation rate, the time of the acetamidine reaction must be prolonged. However, when the reaction time is too long, the decomposition reaction occurs at the same time, and the breakage of the polymer chain or the decomposition of the acetamino group occurs, which causes undesirable results. Therefore, in order to increase the degree of acetylation and inhibit a certain degree of decomposition reaction, it is necessary to set the reaction time to a certain range in -19-201030075. When it is limited by the reaction time, it may not be suitable because the reaction conditions are different, the reaction equipment or other conditions may vary greatly. As the polymer progresses, the molecular weight distribution becomes broad. In the case of cellulose ester, the degree of decomposition can be specified by the weight average molecular weight (Mw) / number average molecular weight (?n) generally used. That is, the acetylation process of the cellulose triacetate may be excessively decomposed in order to prevent the reaction from being excessively long, and at the same time, sufficient time is required for the oximation reaction, and the weight average molecular weight (Mw) / number average molecular weight (?n) may be utilized. It is used as an indicator of the degree of response. An example of the method for producing a cellulose ester is as follows: 1 part by mass of cotton linter is used as a raw material of cellulose, and after being pulverized, '4 parts by mass of acetic acid is added, and 20 minutes at 36 ° C. Pre-activation treatment. Then, 8 parts by mass of sulfuric acid, 260 parts by mass of acetic anhydride, and 350 parts by mass of acetic acid were added, and the esterification reaction was carried out at 36 ° C for 120 minutes. After neutralizing with 11 parts by mass of 24% aqueous magnesium acetate solution, saponification was carried out at 63 ° C for 35 minutes to obtain acetaminophen cellulose. After stirring for 1 minute at room temperature using a 1 乙酸 aqueous solution of acetic acid (acetic acid: water = 1 : 1 (mass ratio)), the dried acetonitrile cellulose having a degree of substitution of 2.75 was obtained by filtration. The yttrium cellulose had a Μη of 92,000, a Mw of 156,000, and a Mw / Μη of 1.7. In the same manner, the cellulose ester conditions (temperature, time, stirring) of the cellulose ester are changed, and the hydrolysis conditions are adjusted to synthesize a cellulose ester having a degree of substitution &apos; Mw/Mn ratio. The Mw/Mn ratio of the cellulose ester is preferably from 1.4 to 5.0. Further, the synthesized cellulose ester is purified to remove low molecular weight components, or -20-201030075 is filtered to remove unacetylated or low acetylation degree, and the mixed acid cellulose ester can be obtained according to the method described in JP-A: . In addition, a trace amount of a metal component in a cellulose ester is a cellulose ester. This is considered to be a metal ion in the core component which is considered to be insoluble in the production process, and it is possible to form a salt with a Φ substance containing an organic acid group to cause an insoluble matter. Therefore, the iron is The Fe) component is preferably 1 ppm or less. An acidic component such as calcium carboxylic acid or sulfonic acid, or a plurality of coordination complexes, forms a lot of floating turbidity derived from insoluble calcium. The consumption (Ca) component is preferably below 6 〇 ppm. When the magnesium (Mg) component is too much, it is preferable to produce ~70 ppm, especially 〇~20 ppm is the most content, the content of calcium (Ca) component, and the magnesium (Mg) component can completely dry the cellulose ester. Micro-digested nitric acid decomposition), after pre-treatment with alkali fusion, analyzed by a bulk emission spectrometer (ICP-AES), (acrylic copolymer), the optical film of the invention contains acrylic acid or acrylic polymer) . Acrylic polymers are preferred for their effectiveness in retarding. The content of No. 1-0-45804 is also related to the water quality used. As a result, the better the decomposition of iron, calcium and magnesium polymers is. Specifically, the (Ca) component is formed into a wet decomposition apparatus which is easy to form a coordination slag (insoluble precipitation, 0 to 30 ppm is a preferably insoluble component, 0: preferably, iron (Fe) component content, etc.) (Inductively coupled plasma-based copolymer for sulfur (hereinafter, the stability effect is used, -21 - 201030075), preferably an acrylic polymer having a weight average molecular weight of 500 or more and 30,000 or less, which contains no aromatic ring and hydrophilicity in the molecule. a polymer X having an ethylenically unsaturated monomer Xa and an ethylenically unsaturated monomer Xb having no hydrophilic ring in the molecule and having a hydrophilic group, and having a weight average molecular weight of not less than 50,000 and not more than 30,000 Preferably, the ethylenically unsaturated monomer Xa having no aromatic ring and hydrophilic group in the molecule and the ethylenically unsaturated monomer Xb having no hydrophilic ring in the molecule are copolymerized to obtain a weight average. Polymer Y having a molecular weight of 5,000 or more and 30,000 or less and an ethylenically unsaturated monomer Ya having no aromatic ring are polymerized to obtain a polymer Y having a weight average molecular weight of 500 or more and 3,000 or less. More preferably. &lt;Polymer X, Polymer Y&gt; Polymer X is an ethylenically unsaturated monomer Xa having no aromatic ring and hydrophilic group in the molecule, and a biphenyl having no hydrophilic ring in the molecule and having a hydrophilic group. The unsaturated monomer Xb is copolymerized to obtain a polymer having a weight average molecular weight of 5 Å or more and 30,000 or less. Among them, 'acrylic or methacrylic monomer having no aromatic ring and hydrophilic group in the Xa molecule' Preferably, the Xb-based acrylic acid or methacrylic acid monomer having no aromatic ring and having a hydrophilic group is represented by the following general formula (X): General formula (X) - (Xa) m- (Xb Η- ( Xc) ρ- is particularly preferably a polymer represented by the following general formula (Χ-1). -22- 201030075 General formula (Xl ) -[CH2.C(-R,)(-C〇2R2 )]m-[CH2-C(-R3)(-C〇2R4-〇H)-]n- [Xc]p- (wherein R, R3 represents a hydrogen group or a methyl group. R2 represents a carbon number of An alkyl group of 1 to 12, a cycloalkyl group. R4 represents a methyl group (-CH2-), an extended ethyl group (-C2H4-) or a propyl group (-C3H6-). XC shows a single polymerization with Xa and Xb. Body unit. m, η, and p show the molar composition ratio. But m is not equal to zero. η is not equal to zero, m + n + p = 1 00 ). The monomer constituting the monomer unit of the polymer X is exemplified as follows, and is not limited to the range. In X, the hydrophilic group means a hydroxyl group and has an ethylene oxide chain. Any of the ethylenically unsaturated monomers Xa having no aromatic ring and hydrophilic group in the molecule, such as methyl acrylate, ethyl acrylate, propyl acrylate (including normal, isomer), butyl acrylate (including positive and negative) , second, third isomers), amyl acrylate (including normal, iso, and second isomers), propylene hexanoate (including normal, isomer), heptyl acrylate (including positive, heterogeneous , octyl acrylate (including normal, isomer), decyl acrylate (including normal, isomer), myristyl acrylate (including normal, isomer), (2-ethylhexyl) acrylate, Acrylic acid (ε-caprolactone), (2-hydroxyethyl) acrylate, (2-ethoxyethyl) acrylate, etc., or the above acrylate is changed to methacrylate. Among them, methyl acrylate 'ethyl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate (including normal and isomer) is preferred. Ethylene-unsaturated mono--23-201030075 having a hydrophilic group in the molecule and having a hydrophilic group. Xb' having a monomer unit having a hydroxyl group is preferably acrylic acid or methacrylic acid, such as acrylic acid (2-hydroxyethyl ester), acrylic acid (2-hydroxypropyl ester), acrylic acid (3-hydroxypropyl ester), acrylic acid (4-hydroxybutyl ester), acrylic acid (2·hydroxybutyl ester)' or the above acrylic acid is replaced by methacrylic acid (2-Hydroxyethyl ester) and methacrylic acid (2-hydroxyethyl ester), acrylic acid (2-hydroxypropyl ester), and acrylic acid (3-hydroxypropyl ester) are preferred.

Xc is not particularly limited as long as Xa and Xb are copolymerizable ethylenically unsaturated monomers, but it is preferred that the aromatic ring is not present.

The molar composition ratio of Xa, Xb and Xc is preferably in the range of m: n in the range of 99:1 to 65:35, and preferably in the range of 95:5 to 75:25. The ρ of Xc is in the range of 0 to 10. Fork; can be a plurality of monomer units.

When the molar composition ratio of Xa is large, the mutual solubility with the cellulose ester becomes good, but the retardation R(Rt) of the film in the thickness direction becomes large. When the molar composition ratio of Xb is large, the above mutual solubility is deteriorated, but the effect of lowering Rt is high. Further, when the molar composition ratio of Xb exceeds the above range, there is a tendency to form a mist at the time of film formation. Therefore, it is necessary to optimize the Xa and Xb moir composition ratios. The molecular weight of the polymer X has a weight average molecular weight of 5,000 or more and preferably 30,000 or less, and more preferably 8,000 or more and 25,000 or less. When the weight average molecular weight is 5,000 or more, the dimensional change of the optical film under high temperature and high humidity is small. Therefore, when used as a protective film for a polarizing plate, there is an advantage that there is less curling. Its weight average molecular weight regulation -24- 201030075 When it is within 30,000, the mutual solubility between cellulose ester and cellulose ester can be suppressed, and fogging and the like can be suppressed when the extravasation is extended under high temperature and high humidity. The weight average molecular weight of the polymer X of the present invention can be controlled by a well-known molecular weight adjustment method. The method for controlling the molecular weight, for example, a method of adding a chain transfer agent such as carbon tetrachloride, lauryl mercaptan or octyl thioacetate can be used. Further, the polymerization temperature is usually from room temperature to 130 ° C, wherein it is preferably carried out in the range of 50 to 100 °, and the temperature or the polymerization anti-φ should be adjusted. The weight average molecular weight can be determined by the following measurement methods. (Method for Measuring Weight Average Molecular Weight) The weight average molecular weight Mw can be determined by gel permeation chromatography. The measurement conditions are as follows: Solvent: Dichloromethane Separation tube: Shodex K806, K805, K803G (Showa Denko φ Division), used by connecting three.

Separation tube temperature: 2 5 °C Sample concentration: 0.1% by mass Detector: RI 504 (product of GL Scientific) Pump: L6 000 (product of Hitachi, Ltd.) Flow rate: 1.0 m 1 / mi η Calibration curve: used Standard polystyrene-fired STK standard polystyrene-ethyl (Dongcao (stock) company products) Mw = 1000000~500 between 13 samples obtained from the calibration curve obtained. 1 3 samples were used with almost equal spacing. -25- 201030075 The polymer Y is a polymer obtained by polymerizing an ethylenically unsaturated monomer Ya having no aromatic ring and having a weight average molecular weight of 500 or more and 3,000 or less. When the weight average molecular weight is 500 or more, the residual monomer of the polymer is preferably reduced. Further, when the weight average molecular weight is 3,000 or less, it is preferable to maintain the function of lowering the enthalpy (Rt). Ya is preferably an acrylic or methacrylic monomer which does not have an aromatic ring. The polymer Y is represented by the following general formula (Y). ❹ The general formula (Υ) - (Ya)k-(Yb)q- is more preferably a polymer represented by the following general formula (Y-1). General formula (Y-1) -[CH2-C(-R5)(-C02R6)]k-[Yb]q- (wherein Κ·5 represents a hydrogen group or a methyl group. R6 represents a carbon number of 1 to 12 The base or cycloalkyl group. Yb represents a monomer unit copolymerizable with Ya. k and q show the molar composition ratio, but k is not equal to zero, k + q = 100). ❿

Yb is an ethylenically unsaturated monomer which can be copolymerized with Ya, and is not particularly limited. Yb can be of a plurality of types. k + q = 100, q shows 〇 ~ 30 is better. Polymerizing an ethylenically unsaturated monomer having no aromatic ring to obtain a polymer Y, an ethylenically unsaturated monomer Ya of the constituent component, and an acrylate such as methyl acrylate 'ethyl acrylate or propyl acrylate (including positive, Isomers), butyl acrylate (including normal, iso, second, and third isomers), amyl acrylate (including normal, iso, and second isomers), hexyl acrylate (including positive and isomers) ), heptyl acrylate (including normal, isomer), octyl acrylate (including normal, isomer), decyl acrylate (including normal, iso-26-201030075 structure), hydroxy myristate (including positive, Isomers), cyclohexyl acrylate, (2-ethylhexyl acrylate), acrylic acid (ε-caprolactone), acrylic acid (2-hydroxyethyl ester), acrylic acid (2-hydroxypropyl ester), acrylic acid (3 -hydroxypropyl ester), acrylic acid (4-hydroxybutyl ester), acrylic acid (2-hydroxybutyl ester), methacrylate such as the above acrylate to methacrylate; unsaturated acid such as acrylic acid, A Acrylic acid, maleic anhydride, crotonic acid Itaconic acid. φ Yb is an ethylenically unsaturated monomer which can be copolymerized with Ya, and is not particularly limited, and vinyl esters such as vinyl acetate, vinyl propionate, vinyl butyrate, vinyl valerate, vinyl pivalate , vinyl hexanoate, vinyl decanoate, vinyl laurate, vinyl myristate, vinyl palmitate, vinyl stearate, vinyl cyclohexanecarboxylate, vinyl octanoate, ethylene methacrylate 'Vinegar, vinyl butenoate, vinyl sorbate', vinyl cinnamate, etc. are preferred. Yb can be plural. In order to synthesize the polymers X and Y, it is difficult to control the molecular weight of the polymer according to the general polymerization method, and it is preferred to use a method which does not cause an increase in molecular weight and which makes the molecular weight uniform. In the polymerization method, for example, a method of using a peroxide polymerization initiator such as cumene peroxide or tributyl hydroperoxide is used, and a polymerization initiator is used in a large amount in comparison with a general polymerization method, and hydrogen sulfide is used in addition to the polymerization initiator. A method of using a chain transfer agent such as a base compound or carbon tetrachloride, and a method of using a polymerization terminator such as p-benzoquinone or dinitrobenzene, and a Japanese Patent Publication No. 2000-128911 or A method of performing block polymerization of -27-201030075 by using a compound having a thiol group and a secondary hydroxyl group or a polymerization catalyst using the compound and the organometallic compound as described in JP-A-2000-3 44 8-23 The above methods are all suitable for use in the present invention, wherein the synthesis of the polymer γ, particularly a polymerization method using a compound having a thiol group and a secondary hydroxyl group in the molecule as a chain transfer agent is preferred. In this case, the terminal of the polymer γ has a hydroxyl group or a thioether group which is caused by a polymerization catalyst and a chain transfer agent. The terminal residue can regulate the mutual solubility between Y and cellulose ester. The valence of the hydroxyl groups of the polymers X and Y is preferably from 30 to 150 [mgKOH/g]. (Method for measuring hydroxyl value) The measurement method was carried out in accordance with Jis K 0070 (1992). The valency of the hydroxy group is defined as the number of mg of potassium hydroxide required to neutralize the acetic acid combined with the hydroxy group when the lg sample is acetonitrile. Specifically, the accurately weighed sample Xg (about lg) was placed in a flask, and 20 ml of an acetamidine reagent (20 ml of acetic anhydride was added to pyridine to 400 ml) was properly added. An air-cooled condenser was installed at the mouth of the flask and heated in a glycerin tank at 95 to 100 °C. After 1 hour and a half, it was cooled, and 1 ml of purified water was added from a gas-cooled condenser to separate acetic anhydride into acetic acid. Then, using a potentiometric titrator, titration was carried out by means of a 5·5ιη〇1 /L potassium hydroxide ethanol solution, and the curve of the titration curve was determined as the end point. In addition, as a blank test, the sample was not subjected to titration, and the strain point of the titration curve was obtained, and the hydroxyl value was calculated according to the following formula. Hydroxyl value = { (BC) X f X 28.05 / Χ} +D (In the formula, B shows the amount of 氢氧化.5mol/L of potassium hydroxide ethanol solution used in the blank test (ml) 'C indicates the amount of 〇.5mol/ used for titration. L potassium hydroxide ethanol solution amount (ml) 'f shows 5. 5mol / L of potassium hydroxide ethanol solution -28 · 201030075 coefficient ' D shows acid bismuth, 28.05 shows 1 mol amount (56.11) of one half of potassium hydroxide value). The above polymers X and Y have excellent mutual solubility of cellulose vinegar, and are excellent in productivity without evapotranspiration or volatilization, and have excellent advantages such as good retention of the polarizing plate protective film, small moisture permeability, and excellent dimensional stability. The content of the polymer X and the polymer γ in the cellulose ester film is preferably in a range satisfying the following formula (i) and the following formula (U). The amount of φ of the polymer X is Xg (% by mass = mass of the polymer X / mass of the cellulose ester X100), and when the content of the polymer Y is Yg (% by mass), the formula (i) 5 S Xg + YgS 35 (% by mass) Formula (ii) 0.05 S Yg / ( Xg + Yg ) $ 0.4 The preferred range of the formula (i) is from 1 〇 to 25% by mass. When the total amount of the polymer X and the polymer Y is 5% by mass or more, it is sufficient for the reduction of the enthalpy (Rt). Further, the total amount is 35 mass% or less, and it has good adhesion to a polyvinyl alcohol-based polarizer. The polymer X and the polymer Y may be added as a raw material of the following constituent slurry, or dissolved, or dissolved in an organic solvent of a soluble cellulose ester in advance, and then added to the dope. (Compound having a furanose structure or a pyranose structure) The optical film of the present invention has at least one furanose structure or a pyranose structure to form a compound having 1 to 12 of the furanose structure or the pyranose structure. It is preferred that all or part of the hydroxyl group-esterified compound (or -29-201030075 is a sugar ester compound). Preferably, the "a compound having at least one furanose structure or a caramel structure, and the compound of the furanose structure or the pyranose structure is one to twelve" is as follows, but the present invention is not limited to the example. range. Examples of such are glucose, galactose, mannose, fructose, xylose, arabinose, lactose, sucrose, cellobiose, cellotriose, maltotriose, raffinose, etc., which have a furanose structure and pyridin Both of the saccharose structures are optimal, such as sucrose. Synthesizing the above-mentioned compound (sweet ester having at least one unfurther furanose structure or pyranose structure, and all or part of the hydroxyl groups in the compound of 1 to 12 of the furanose structure or the pyranose structure are esterified In the case of the compound), the monocarboxylic acid to be used is not particularly limited, and it can be esterified by using a known aliphatic monocarboxylic acid, an alicyclic monocarboxylic acid, an aromatic monocarboxylic acid or the like, and the present invention can be synthesized. A sugar ester compound is used. The carboxylic acid to be used may be one type or a mixture of two or more types. Preferred of the aliphatic monocarboxylic acid, such as acetic acid, propionic acid, butyric acid, isobutyric acid, valeric acid, caproic acid, heptanoic acid, caprylic acid, capric acid, capric acid, 2-ethyl-hexanecarboxylic acid, Undecanoic acid, dodecanoic acid, tridecanoic acid, myristic acid, pentadecanoic acid, palmitic acid, heptadecanoic acid, octadecanoic acid, nonadecanic acid, eicosanoic acid, a saturated fatty acid such as dodecanoic acid, tetracosanoic acid, hexadecanoic acid, heptacosanoic acid, octacosanoic acid, tridecanoic acid, or tridecanoic acid; undecylenic acid An unsaturated fatty acid such as oleic acid, sorbic acid, linoleic acid, linolenic acid, arachidonic acid or octenoic acid. Preferred of the alicyclic monocarboxylic acid are, for example, cyclopentacarboxylic acid, cyclohexacarboxyl-30-201030075 acid, cyclooctanoic acid or a derivative thereof and the like. The aromatic monocarboxylic acid, for example, an aromatic monocarboxylic acid having a substituent of 1 to 5 alkyl groups or an alkoxy group introduced into a benzene ring of benzoic acid such as benzoic acid or phenylacetic acid; cinnamic acid or diphenyl group; An aromatic monocarboxylic acid or a derivative thereof having two or more benzene rings such as glycolic acid, biphenylcarboxylic acid, naphthocarboxylic acid or tetrahydronaphthalene carboxylic acid, among which benzoic acid is most preferred. The details of the production method of the above-mentioned compounds are described in Japanese Laid-Open Patent Publication No. Hei. No. Hei. No. Hei. Specific examples thereof are as follows, but the present invention is not limited thereto.

-31 - 201030075 [Chemical 3] Compound 1

R1 —C—CH, Compound 2 CH2OCOCH3 -〇 CH2OR2 R20

,H R2〇/CH2〇COCH3 OR2 OR2 Η Ο R2= —C~CHCH3 ch3 Compound 3

Ο it R3= a C compound 4

?, R4=—C-C2Hs -32 201030075 [Chemical 4] Compound 5

RS = compound β CH9OR6

Ο υ -C-CH, Compound 7

R7= O it -c-ch3 Compound 8

o R8=—C-CH3 -33- 201030075 [Chemical 5] Compound 9

H OR9 H OR9 H OR9 R9= —C-CH3

CHoORIO

Compound 10 R10* - C-CH3 Optical Thin Sugar structure ~1 2 Compound I is preferred. : preserving the optical film of the present invention, in order to suppress the occurrence of fogging during stretching, the film contains 1 to 35% by mass of the above-mentioned at least one furfuryl or pyranose structure, and the furanose structure or pyranose structure It is preferable that all or part of the hydroxyl groups of the compound to be combined are esterified with 5, and particularly, when the esterified product containing 5 to 30% by mass is contained in the range, the excellent effects of the present invention can be exhibited. There will be no extravasation in the idle material. (plasticizer) A plasticizer. The optical film of the present invention, in addition to the general formula (1), may have other effects if necessary to obtain the effect of the present invention. -34-201030075 Plasticizer is plasticized by a polybasic acid ester, although it is not particularly limited. The agent, the glycolic acid-based plasticizer, the phthalate-based plasticizer, the fatty acid ester-based plasticizer, the polyol ester-based plasticizer, and the acrylic plasticizer are optionally used. Among them, when two or more kinds of plasticizers are used, at least one of them is preferably a polyol ester-based plasticizer. These plasticizers are preferably used in the range of 1 to 30% by mass based on the cellulose ester. The polyol ester-based plasticizer is a compound represented by the following general formula (2). • General formula (2) R1 - (OH)n (wherein R1 represents an organic group of η valence, and n represents a positive integer of 2 or more). Preferred of hydrazine polyol is as shown below, but the invention is not limited thereto. The range shown. For example, ribitol, arabinol, ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, 1,2-propylene glycol, 1,3-propanediol, dipropylene glycol, tripropylene glycol, 1,2- Butylene glycol, 1,3-butanediol, 1,4-butanediol, dibutylene glycol, 1,2,4-butanetriol, 1,5-pentanediol, 1,6-hexanediol , hexanetriol, φ galactitol, mannitol, 3-methylpenta-1,3,5·triol, pinacol, sorbitol, trimethylolpropane, trimethylolethane, Xylitol, pentaerythritol, dipentaerythritol, and the like. Among them, trimethylolpropane and pentaerythritol are preferred. The monocarboxylic acid to be used for the polyol ester is not particularly limited, and a known aliphatic monocarboxylic acid, alicyclic monocarboxylic acid, aromatic monocarboxylic acid or the like can be used. When an alicyclic monocarboxylic acid or an aromatic monocarboxylic acid is used, the moisture permeability is improved as in the case of the acid carboxylic acid 1 as an example. , the slogan and the example of the limit of the nature of the bureau can not be guaranteed only,, under -35- 201030075 aliphatic monocarboxylic acid to use a linear or scorpion chain fatty acid with a carbon number of 1~32 It is better. Among them, those having a carbon number of 1 to 20 are preferable, and those having a carbon number of 1 to 1 are more preferable. When acetic acid is used, it is preferable to increase the mutual solubility with the cellulose ester, and it is also preferable to use a mixture of acetic acid and other monocarboxylic acids. Preferred aliphatic fatty monocarboxylic acids such as acetic acid, propionic acid, butyric acid, valeric acid, caproic acid, heptanoic acid, caprylic acid, capric acid, capric acid, 2-ethyl-hexanecarboxylic acid, undecanoic acid, ten Dialkyl acid, tridecanoic acid, myristic acid, pentadecanoic acid, palmitic acid, heptadecanoic acid, octadecanoic acid, nonadecanoic acid, eicosanoic acid, behenic acid, a saturated fatty acid such as tetradecanoic acid, hexadecanoic acid, heptacosanoic acid, octacosanoic acid, tridecanoic acid or tridecanoic acid; undecylenic acid, oleic acid, sorbic acid And unsaturated fatty acids such as linoleic acid, linolenic acid, and arachidonic acid. Preferred are alicyclic monocarboxylic acids such as cyclopentacarboxylic acid, cyclohexanecarboxylic acid, cyclooctylcarboxylic acid, or the like. Preferably, an aromatic monocarboxylic acid such as benzoic acid or phenylacetic acid has an alkyl group introduced into a benzene ring; and a biphenylmethylcarboxylic acid, a naphthocarboxylic acid, a naphthylcarboxylic acid or the like has two or more. An aromatic monocarboxylic acid or a derivative thereof of a benzene ring. Especially benzoic acid is the best. The molecular weight of the polyol ester is preferably in the range of from 300 to 1,500, and more preferably in the range of from 350 to 750. When the molecular weight is too large, it is less volatile and is preferred. However, in terms of moisture permeability and mutual solubility with cellulose esters, it is preferred to be smaller. The carboxylic acid used for the polyol ester may be one or a mixture of two or more. Further, the radicals in the polyol may be all esterified or partially retained in the form of a base. Specific compounds of the polyol ester are shown below. -36- 201030075 [Chem. 6] B-1 B-2 B-3 B-4 B-5 B-6 C4H9-C-〇-(CH2)2-〇-(CH2)2-0-(CH2)2 -0-C-C4H9 OO (CH2)2-〇-(CH2)2-〇-{CH2)2-〇-C- o 〇t° 〇r°- C4H9*C~〇—^ΟΗ2&quot;ΟΗ2~· 〇'^β〇&quot;〇4Ηβ oo C8H17-C-〇&quot;fcH2-CH2-〇-^-C-C8H17 -(CH2)2-〇-{CH2)2-〇-(CH2)2 r〇ο λ~f °ιΌ

B-8 B-9 B —10 B-11 B-12 B-13 B-14 〇-r°-fc〇^-. + C4H9-C-〇-^CH2CH2CH2-〇^-C-C4H9 o 3 o C8H17-C-〇-^CH2CH2CH2-〇·^—c-c8h17Oto_

-ch2-ch2 I O 4—c-/~\ -ch2ch2ch2-o

-ch2ch2ch2-o

0 I ch3

B-15

C4h9-c-o-^ch2ch-o^-c-c4h9 〇 ch3 o c8h17-c-o-(-ch2ch-o^-c-c8h17. έΗ3. O~r°^cH2?H_0HO-37- 201030075 [Chem. 7]

B-1B ch3ch2- ch2-oc- B-17 D II _c_c4h* CHa-〇-C CH3CH widely C-CHrO-C-CAi 〇B-18 ch2-oc-oo ch2-〇-c-c8h17 CH2-OC- C4H9 IIo ch3ch2—c—ch2-oc-c8h17I 〇CH2-〇-C-CeH17o B-20 ch7 °-^-〇ch3ch2—c—ch2-oc-ch3o ch2-oc-ch: II o B-19

B-22

π /~VC〇cH3)i.5 CHz-O-C—^ J CHaCHa—C—CH2-〇-C—/ ^ CHa-O^C-CHs

O B—24 ch3ch2—c—ch2—o-c—^ h ^(OCH3)1&gt;5 ch2-o-c«^j^ •38- 201030075

-39- 201030075 [化9] Β-31 /-Λ ^ ^C&quot;O^CH2&quot;CH&quot;CH2^Q^»

Β-33 〇-r°-(CH* -CH2-CH2 - 0

)r°

rO B_35 C-0&quot;fcH2-〒 Η-

B—36 ff C-O^CHj-CH—CHa S ?

Cs〇 ό B-37

37 \ 0 0 -cH2-c-〇-ch2-ch*-〇^c-ch2-ch2-c-o-^^- Others such as trishydroxypropyl propyl triacetate vinegar pentaerythritol tetraacetic acid vinegar can also be used. The glycolate plasticizer is not particularly limited, but an alkyl mercapto glycolate is preferred. The alkyl mercapto alkyl glycolate such as methyl decyl methyl glycolate, ethyl decyl ethyl glycolate, propyl decyl propyl glycolate, butyl hydrazine Mercaptobutyl butyl glycolate, oct-40- 201030075 thiodecyl octyl glycolate, methyl decyl ethyl glycolate, ethyl decyl methyl glycolate, ethyl decyl Propyl glycolate, methyl decyl butyl glycolate, ethyl decyl butyl glycolate, butyl decyl methyl glycolate, butyl decyl ethyl glycolate, Propyl butyl butyl glycolate, butyl decyl propyl glycolate, methyl decyl octyl glycolate, ethyl decyl octyl glycolate, octyl decyl Glycolate, octyldecyl ethyl glycolate, and the like. A phthalate plasticizer such as diethyl phthalate, dimethoxyethyl phthalate, dimethyl phthalate, dioctyl phthalate, dibutyl phthalate, di-2-ethyl phthalate Hexyl ester, dioctyl phthalate, dicyclohexyl phthalate, dicyclohexyl terephthalate, and the like. Examples of the phthalate plasticizers include etidinyl trimethyl phthalate, ethionyl triethyl phthalate, and butyl tributyl citrate. The fatty acid ester-based plasticizers are, for example, butyl oleate, methyl decyl ricinolate, dibutyl sebacate and the like. Examples of the phosphate ester plasticizer include triphenyl phosphate, tricresyl phosphate, toluene diphenyl phosphate, octyl diphenyl phosphate, diphenyl biphenyl phosphate, trioctyl phosphate, and tributyl phosphate. The polycarboxylic acid ester ester is composed of an ester of a polyvalent carboxylic acid having a valence of 2 or more, preferably 2 to 20, and an alcohol. Further, the aliphatic polycarboxylic acid is preferably from 2 to 20, and the aromatic polycarboxylic acid or alicyclic polycarboxylic acid is preferably from 3 to 20; The polycarboxylic acid is, for example, represented by the following general formula (3): General formula (3) R2(COOH)m(OH)n -41 - 201030075 (wherein R2 represents an organic group of (m + n) valence, m is shown A positive integer of 2 or more, η represents an integer of 0 or more, a COOH group represents a carboxylic acid group, and an OH group represents an alcoholic or phenolic hydroxyl group). Preferred polycarboxylic acids are exemplified as follows, but the invention is not limited to the illustrated ranges. a trivalent or higher aromatic polycarboxylic acid such as trimellitic acid, trimesic acid or pyromellitic acid or a derivative thereof, succinic acid, adipic acid, sebacic acid, sebacic acid, oxalic acid, fumaric acid, A polyvalent polycarboxylic acid such as maleic acid or tetrahydrofurfuric acid, a hydroxypolycarboxylic acid such as tartaric acid, hydroxymalonic acid, malic acid or citric acid is preferable. In terms of improving retention, it is more preferable to use a hydroxypolycarboxylic acid. The alcohol to be used in the polycarboxylic acid ester ester which can be used in the present invention is not particularly limited, and known alcohols and phenols can be used. For example, an aliphatic saturated alcohol or an aliphatic unsaturated alcohol having a linear or quinone chain having a carbon number of 1 to 32 is preferred. Among them, those having a carbon number of 1 to 20 are more preferable, and those having a carbon number of 1 to 1 are most preferred. Further, for example, an aliphatic cyclic alcohol such as cyclopentanol or cyclohexanol or a derivative thereof, an aromatic alcohol such as benzyl alcohol or cinnamyl alcohol or a derivative thereof can be suitably used. When a hydroxypolycarboxylic acid is used as the polyvalent carboxylic acid, The alcohol of the hydroxypolycarboxylic acid or the phenolic hydroxyl group may be added to the esterified product using a monocarboxylic acid. Preferred examples of the monocarboxylic acid are as follows, but the present invention is not limited to the scope of the examples. The aliphatic monocarboxylic acid is preferably exemplified by a linear or quinone chain fatty acid having a carbon number of 1 to 32. Among them, those having a carbon number of from 1 to 20 are preferred, and those having a carbon number of from 1 to 10 are particularly preferred. Preferred are aliphatic monocarboxylic acids such as acetic acid, propionic acid, butyric acid, valeric acid-42-201030075, caproic acid, heptanoic acid, caprylic acid, capric acid, capric acid, 2-ethyl-hexanecarboxylic acid, undecane. Acid, dodecanoic acid, tridecanoic acid, myristic acid, pentadecanoic acid, hexadecaic acid, seventeen yard acid, eighteen yard acid, nineteen yard acid, ten yards acid, one twelve a saturated fatty acid such as an alkanoic acid, a tetracosanoic acid, a hexadecanoic acid, a heptacosanoic acid, a octadecanoic acid, a tri-alkanoic acid or a tridecanoic acid; an enoic acid, an oleic acid, Sorbic acid, such as linoleic acid, linolenic acid, and peanuts, are unsaturated fatty acids. The φ aliphatic monocarboxylic acid is preferably, for example, a cyclopentacarboxylic acid, a cyclohexanecarboxylic acid, a cyclooctylcarboxylic acid or the like. The aromatic monocarboxylic acid is preferably one having an alkyl group introduced into a benzene ring such as benzoic acid or phenylacetic acid; and two or more benzene rings such as a biphenylcarboxylic acid, a naphthalenecarboxylic acid or a naphthylcarboxylic acid; An aromatic monocarboxylic acid or a derivative thereof. Among them, acetic acid 'propionic acid and benzoic acid are the best. The molecular weight of the polycarboxylic acid esterified product is not particularly limited, but is preferably in the range of 300 to 1,000 in terms of molecular weight and more preferably in the range of 350 to 750 in terms of molecular weight. From the viewpoint of increasing the retention, the molecular weight is preferably larger, but in terms of the mutual solubility between the moisture permeability and the cellulose ester, it is preferred that the molecular weight is small. The alcohol used in the polycarboxylic acid ester may be one or a mixture of two or more. The acid hydrazide of the polycarboxylic acid ester ester is preferably 1 mgKOH / g or less, and more preferably 〇. 2 mgKOH/g or less. When the acidity is maintained in the above range, it is preferable to suppress the environmental change of the retardation. (Acidate) The acid strontium refers to the mg of potassium hydroxide necessary for neutralizing the acid contained in the 1 g sample (the carboxylic acid-43-201030075 acid group present in the sample). This acid bismuth is measured in accordance with JIS K0070. The preferred examples of the polycarboxylic acid esterified compound are as follows, but the present invention is not limited to the scope of the examples. For example, triethyl citrate, tributyl citrate, ethyl decyl citrate (ATEC), butyl tributyl phthalate (ATBC), benzyl decyl phthalate Tributyl ester, ethoxylated triphenyl phthalate, ethoxylated triphenylmethyl phthalate, dibutyl tartrate, dibutyl butyl tartrate, tributyl trimellitate, benzene Tetrabutyl formate and the like. (Ultraviolet Light Absorber) The optical film of the present invention preferably contains an ultraviolet light absorber. The ultraviolet light absorbing agent absorbs ultraviolet light having a wavelength of 400 nm or less to enhance the durability thereof, and particularly preferably, the transmittance at a wavelength of 370 nm is 10% or less, and more preferably 5% or less. It is best to be 2% or less. The ultraviolet light absorber to be used in the present invention is not particularly limited, and examples thereof include a hydroxybenzophenone-based compound, a benzotriazole-based compound, a salicylate-based compound, a benzophenone-based compound, and a cyanoacrylate-based compound. A triterpenoid compound, a nickel stear salt compound, an inorganic powder, or the like can be used. Specifically, for example, 5-chloro-2-(3,5-di-secondbutyl-2-hydroxyphenyl)-2H-benzotriazole, (2-2H-benzotriazol-2-yl)-6- (linear and fluorenated dodecyl)-4-methylphenol, 2-hydroxy-4-benzyloxybenzophenone, 2,4-benzyloxybenzophenone, etc. Further, benzotriazole cresol 109, benzotriazole cresol 171, benzotriazole cresol 234, benzotriazole cresol 326, benzotriazole cresol 327, benzotriazole cresol 328 and the like benzotriazole cresols (All are Ciba • Japan 201030075, the market-based products of this branch) are applicable. The preferred ultraviolet light absorbers used in the present invention are benzotriazole ultraviolet light absorbers, benzophenone ultraviolet light absorbers, and three tillage ultraviolet light absorbers, among which benzotriazole ultraviolet light is used. An absorbent and a benzophenone-based ultraviolet light absorber are preferred. As the benzotriazole-based ultraviolet light absorber, for example, the compound represented by the following general formula (a) can be used.

[Chem. 10] - General (a)

OH |:N

R1 R2 where ' Ri, R2, R3, R4 and R5 may be the same or different structures, respectively representing a hydrogen atom, a halogen atom, a nitro group, a hydroxyl group, an alkyl group, an alkenyl group, an aryl group, an alkoxy group, an anthracene group A aryl group, an aryloxy group, an alkylthio group, an arylthio group, a mono or dialkylamino group, a decylamino group or a 5- to 6-membered heterocyclic group. Further, R4 and R5 may be cyclized to form a 5 to 6-membered carbocyclic ring. Further, the organic group described above may have any substituent. Specific examples of the benzotriazole-based ultraviolet light absorber used in the present invention are as follows. The present invention is not limited to the scope of the examples. UV-1: 2_(2'-hydroxy-5·-tolyl)benzotriazole, UV-2: 2-(2, hydroxy-3',5'-di-t-butylphenyl)benzotriene Oxazole-45- 201030075 UV-3: 2-(2,-hydroxy-3,-tert-butyl-5,-tolyl)benzotriazole, UV-4: 2-(2'-hydroxy·3' , 5'-di-t-butylphenyl)-5-chlorobenzotriazine, UV-5: 2-( 2'-hydroxy-3·- ( 3&quot;,4&quot;,5&quot;,6&quot;-four Hydroquinone iminomethyl)-5·-tolyl)benzotriazole, UV-6: 2,2-extended methyl bis(4-(1,1,3,3-tetramethylbutyl) - 6-(2Η-benzotriazol-2-yl)phenol), UV-7: 2-(2'-hydroxy-31-t-butyl-5'-methylphenyl)-5-chlorobenzo Triazole, UV-8: 2-(2Η-benzotriazol-2-yl)-6-(linear and decyl-dodecyl)-4-methylphenol (referred to as TINUVIN171) UV-9 : Octyl-3-[3-t-butyl-4-hydroxy-5-(chloro-2H-benzotriazol-2-yl)phenyl]propionate and 2-ethylhexyl-3-[ Mixture of 3-tert-butyl-4-hydroxy-5-(5-chloro-2H-benzotriazol-2-yl)phenyl]propionate (referred to as TINUVIN1 09). Further, the benzophenone-based ultraviolet light absorber is preferably a compound represented by the following general formula (b). (b) 201030075 wherein 'γ represents a hydrogen atom, a halogen atom or an alkyl group, an alkenyl group, an alkoxy group and a phenyl group, and the alkyl group, the alkenyl group and the phenyl group may have a substituent. . A hydrogen atom, an alkyl group, an alkenyl group, a phenyl group, a cycloalkyl group, an alkylcarbonyl group, an alkylsulfonyl group or -CO(NH)nlD, D represents an alkyl group, an alkenyl group or a phenyl group which may have a substituent . m and η show 1 or 2. The above alkyl group is exemplified by a linear or fluorenyl aliphatic group having a carbon number of 24 or less. The alkoxy group is exemplified by an alkoxy group having a carbon number of 18 or less, and the φ alkenyl group is exemplified by a carbon number of 16 or less. The alkenyl group is specifically, for example, a propenyl group or a 2-butenyl group. Further, the halogen atom of the substituent on the alkyl group, the alkenyl group or the phenyl group is, for example, an atom such as chlorine, bromine or fluorine, a hydroxyl group or a phenyl group (the phenyl group may have a substituent such as an alkyl group or a halogen atom). Specific examples of the benzophenone-based ultraviolet light absorber represented by the general formula (b) are as follows. The invention is not limited to the scope of the examples. UV-10: 2,4-dihydroxybenzophenone UV-11 : 2,2'-dihydroxy-4-methoxybenzophenone φ UV-12 : 2_hydroxy-4-methoxy- 5-sulfonic benzophenone UV-13: bis(2-methoxy-4-hydroxy-5-benzhydrylphenylmethane), such as a compound having a 1,3,5-trianthene ring, etc. Discotic compounds can also be used as an ultraviolet light absorber. The polarizing plate protective film of the present invention preferably contains two or more kinds of ultraviolet light absorbers. Further, the polymer ultraviolet absorbing agent can also be used as a suitable ultraviolet absorbing agent, and a polymer-like ultraviolet absorbing agent described in the publication of Japanese Laid-Open Patent Publication No. Hei 6-148430 is preferable. -47- 201030075 Adding ultraviolet light absorber by dissolving ultraviolet light absorber with alcohol such as methanol, ethanol or butanol or organic solvent such as dichloromethane, methyl acetate, acetone or dioxolane or a mixed solvent thereof It is added to the coating paint or directly to the coating paint composition. If the inorganic powder or the like is not dissolved in the organic solvent, it is added to the coating paint by, for example, dispersing in an organic solvent and a cellulose ester by means of a dissolving rod or sanding.使用 The amount of the ultraviolet light absorber used varies depending on the type of the ultraviolet light absorber, the use conditions, etc. When the dry film thickness of the optical film is 30 to 200 //m, the optical film meter is used in an amount of 0.5 to 10% by mass. Good, among them, to use 〇. 6~4% by mass is better. (Particles) The optical film of the present invention preferably contains fine particles from the viewpoint of lubricity and storage stability. ❿ the particulate matter such as cerium oxide, titanium dioxide, aluminum oxide, zirconium oxide, calcium carbonate, calcium carbonate, talc, clay, calcined kaolin, calcined calcium citrate, calcium citrate hydrate, aluminum citrate, magnesium citrate and An inorganic compound such as calcium phosphate. The fine particles are preferably yttrium-containing, and the average particle size of the primary particles of the fine particles is preferably from 5 to 400 nm, more preferably from 10 to 300 nm. These fine particles are mainly contained in a secondary aggregate having a particle diameter of 0.05 to 3.3//m. In the case of a granule having an average particle diameter of 100 to 10,000 nm, it is preferably not contained in a single granule. The amount of the fine particles contained in the optical film is preferably from 1 to 1% by mass, particularly preferably from -48 to 201030075 from 0.05 to 0.5% by mass. When the optical film of the multilayer structure is formed by the co-flow molding method, it is preferred to contain the added amount of fine particles on the surface. The particulate matter of cerium oxide can be used as a gas phase white carbon black R972, R972V, R974, R812, 200, 200V, 300, R202, 0X50' TT600 (all products of Japan Aerosil Co., Ltd.), etc. The city's retailers. As the fine particles of zirconia, commercially available products of the gas phase white carbon blacks φ R97 6 and R81 1 (all of which are products of Japan Aerosil Co., Ltd.) can be used. Examples of the polymer include an anthracene resin, a fluororesin, an acrylic resin, and the like. Among them, enamel resin is preferred, especially those having a three-dimensional network structure, for example, the trade names are Tospar 103, 105, 108, 120, 145, 3 120 and 240 (all of which are Toshiba 矽 ( Stocks) company products) and other marketers. Among them, from the viewpoint of maintaining a low haze of the optical film and a large effect of lowering the friction coefficient, it is preferable to use a vapor-based white carbon black of 200 V and R972V φ. In the optical film of the present invention, the dynamic friction coefficient of at least one side is preferably in the range of 0.2 to 1.0. (Dye) The optical film of the present invention is a dye which can be added to regulate color. For example, a blue dye may be added to suppress the yellow color of the film. Preferred dyes are, for example, oxime dyes. The lanthanide dye may have a substituent at any position from the 1-position to the 8-position of the oxime. Preferred substituents such as an anilino group, a hydroxyl group, an amine group, a nitro-49 - 201030075 or a hydrogen atom 'dye are the blue dyes described in JP-A-2001-154017, and the lanthanide-based dye is preferred. . Each of the additives may be added in portions to the coating material containing the cellulose ester solution before film formation, or the additive solution may be added to the in-line system. In order to reduce the load on the filter material, the micro-granules are preferably added locally or in full on the in-line system. When the additive solution is added on-line, it is preferable to dissolve the cellulose ester in a small amount in order to enhance the mixing property with the coating paint. The amount of the cellulose ester to be used is preferably from 0 to 5 parts by mass based on 100 parts by mass of the solvent, and preferably from 3 to 5 parts by mass. In the present invention, it is preferable to use an in-line mixer such as a static agitator (product of Toray Engineering Co., Ltd.) 'SWJ (Dongli static type pipe mixer high mixer) for the addition and mixing. (Method for Producing Optical Film) A method for producing an optical film of the present invention will be described below. The optical film of the present invention can be suitably used regardless of the film formed by the solution casting method or the melt casting method. When the optical film of the present invention is produced by a solution casting method, it can be produced by the following procedure. a step of dissolving a cellulose ester and the above additive in a solvent to prepare a coating paint; a step of casting the coating material on an annular moving annular metal support; and casting the coated paint as a primer to dry a step of stripping from the metal support; a step of extending or maintaining a wide width; a step of drying; and rolling up the film. -50- 201030075 First, explain the application of the coating paint. The concentration of the cellulose ester in the coating material is preferably such that when the concentrate is cast on the metal support, the drying load can be reduced. However, when the cellulose ester concentration is too high, the load is increased during filtration and the filtration accuracy is deteriorated. The bilateral concentration which can be simultaneously established is preferably from 10 to 35 mass%, more preferably from 15 to 25 mass%. The solvent used for coating the paint may be used alone or in combination of two or more. From the viewpoint of improving productivity, a good solvent and a weak solvent of the cellulose ester are preferably used, and when a good solvent is used, it is preferable from the viewpoint of dissolving the cellulose ester. The mixing ratio of the good solvent and the weak solvent is preferably from 70 to 98% by mass in the good solvent and from 2 to 30% by mass in the weak solvent. A good solvent means a solvent which dissolves the cellulose ester used alone, and a solvent which is only swollen or which does not dissolve the cellulose ester used is defined as a weak solvent. Therefore, 'the solvent and weak solvent vary with the average degree of substitution of cellulose vinegar, for example, acetone is used as the solvent, and cellulose ester is acetate (the degree of substitution of ethyl ketone is 2_4). Acetate propionate is a good solvent, while cellulose acetate (which has an ethoxylation degree of 2.8) becomes a weak solvent. The good solvent is not particularly limited, and examples thereof include an organic halogen compound such as dichloromethane or dioxolane, acetone, methyl acetate, methyl acetoxyacetate and the like. Among them, dichloromethane or methyl acetate is preferred. Further, the weak solvent is not particularly limited, and is preferably, for example, methanol, ethanol, n-butanol, cyclohexyl or cyclohexanthene. Further, it is preferred that the coating material contains 0.01 to 2% by mass of water. Further, the solvent for dissolving the cellulose ester can be recovered and reused by drying the solvent removed from the film in the film forming step. -51 - 201030075 The recovered solvent may contain a trace amount of an additive added to the cellulose ester, for example, Plasticizers, UV absorbers, polymers, monomer components, etc., however, can still provide suitable reuse, and if necessary, can be refined and reused. When the above coating paint is prepared, the dissolution method of the cellulose ester can be carried out by a usual method. When combined heating and pressurization, it can be heated to a temperature above the boiling point of normal pressure. When the solvent is at a boiling point or higher at a normal pressure of a solvent and the solvent is not boiled under pressure, the mixture is stirred and dissolved while being heated, thereby preventing the occurrence of gel or bulk undissolved matter. Further, it is preferred to dissolve the cellulose ester in a weak solvent to make it wet or swell, and then add a good solvent. The pressurization may be carried out by a method of injecting a non-activated gas such as nitrogen or by heating to increase the vapor pressure of the solvent, and the heating may be externally heated to be preferable. For example, it is easy to adjust the temperature by using a casing type heating device. good. The heating temperature after the addition of the solvent is preferably at a higher temperature with respect to the solubility of the cellulose ester. However, the heating temperature is too high, and the necessary pressure is too high and the productivity is deteriorated. The heating temperature is preferably in the range of 45 to 120 ° C, more preferably in the range of 60 to 110 ° C, and more preferably 70 to 105 ° C. Also, the pressure should be adjusted so that the solvent does not boil at the set temperature. The cooling dissolution method is also suitable for use, whereby the cellulose ester can be dissolved in a solvent such as acetic acid acetate. Next, the cellulose ester solution is filtered using a suitable filter material such as filter paper. The filter material is a filter insoluble matter or the like, and it is preferable to use an absolute filtration precision. However, when the absolute filtration accuracy is too small, the mesh of the filter material -52 - 201030075 is easily plugged. Therefore, the filter material having an absolute filtration accuracy of 〇. 〇〇 8 mm or less is preferable, and a filter material of 0.001 to 〇. 〇〇 8 mm is preferable, and a filter material of 0.003 to 0.006 mm is more preferable. The material of the filter material is not particularly limited to a general filter material that can be used, such as a filter material made of plastic such as polypropylene or Teflon (trademark) or a metal filter material such as stainless steel, which is due to the absence of fibers of the filter material. good. The impurities contained in the cellulose ester of the raw material are removed by filtration, and φ is particularly removed, and it is preferable to reduce the foreign matter of the bright spot. The bright spot foreign matter means that when two polarizing plates are arranged in a crossed Nicols prism state, an optical film is placed in the middle thereof, and light is irradiated from one side of the polarizing plate side. When viewed from the polarizing plate side of the other side, the opposing surface can be viewed from the opposite side. When the point of light leakage (foreign matter) is seen, the number of bright spots having a diameter of 0.01 mm or more is preferably 200 or less. Among them, 1 / / cm 2 or less is preferable, and 50 / cm 2 or less is more preferable, and most preferably 〇 1 1 / cm 2 or less. In addition, the fewer the gain points below 0.01 mm, the better. # Filtration of the coating paint by the general method, using the solvent above the boiling point of atmospheric pressure, and the method of heating under the pressure of the solvent is not boiling range of filtration, due to the filter pressure difference before and after filtration (called pressure difference) The rise is small and better. The preferred temperature is between 4 5 and 1 2 0. (: range, where 4 5~7 0 t: for better '45 to 55 ° C is the best. The filtration pressure is preferably smaller. Filtration; pressure below 1.6 MPa is better, wherein, to 1. 2 MPa or less is preferable, and 1 〇 MPa or less is more preferable. The following description of the casting of the coating material is given. The metal support in the casting step is preferably a mirror-like surface, the gold-53-201030075 The holder can be a stainless steel belt or a plated roller with a casting. The casting width can be 〜4m. The width of the optical film of the present invention is preferably 1.6~4m. The surface temperature of the metal support in the casting step is -5 (TC ~ solvent below the boiling point temperature, the drying speed of the primer is fast and good at higher temperatures, but the primer will foam when the temperature is too high or The flatness deterioration may be unsuitable. The support temperature is preferably 0 to 40 ° C, preferably 5 to 30 ° C. Alternatively, the primer may be gelled by cooling to remove the residual solvent from the roller. Tube peeling is also a preferred method. The method of adjusting the temperature of the metal support is not particularly limited, and the method of hot air or cold air blowing is used, or the method is utilized. Water can be used to contact the back of the metal support. The use of warm water method can effectively transfer heat, so the time required for the metal support to reach a certain temperature is shorter. When using hot air, a higher temperature than the purpose can be used. The optical film should have a good planar shape. When the base material is peeled off from the metal support, the residual solvent amount is preferably 10 to 150% by mass, and 20 to 40% by mass or 6 to 130% by mass. % is more preferably 20 to 30% by mass or 70 to 120% by mass. In the present invention, the amount of the residual solvent is defined by the following formula: Residual solvent amount (% by mass) = { ( MN ) / N } In the X100 formula, the mass of the sample taken at any time during or after the manufacture of the primer or film is shown, and the mass of the crucible is heated at 115 Torr for 1 hour. Also, in the drying step of the optical film, The metal support is peeled off from the primer, and after drying, the amount of the residual solvent is preferably 1% by mass or less. Among them, it is preferably 0. 1% by mass or less, particularly preferably 〇~0.0 1% by mass or less -54- 201030075 Best. Film drying step, general mining The bottom material is conveyed by a roll drying method (the bottom material is alternately dried by a plurality of rolls arranged up and down) or by a widening method. When the optical film of the present invention is produced, the metal film is peeled off from the metal support, and the bottom material is The amount of residual solvent is plural, and it extends in the longitudinal direction (MD direction), and it is preferable to extend the both ends of the primer by a pinching method such as a clip to extend in the width direction (TD φ direction). Stretching is preferably carried out by peeling tension at a temperature of 2 1 0 N / m or more, particularly preferably at 220 to 300 N/m. The method of drying the primer is not particularly limited, and usually hot air, infrared rays, It is preferable to carry out heating by a hot roll, microwave, etc., and it is preferable to dry by hot air. In the drying step of the primer, the drying temperature is preferably from 90 to 20%, and wherein it is preferably from 1 1 Torr to 160 °C. The drying temperature is preferably gradually increased. The drying time varies depending on the drying temperature, and is preferably from 5 to 60 minutes, particularly preferably from 10 to 30 minutes. The film thickness of the optical film is not particularly limited, and it is preferably 10 to 200 // m. It is more preferable to use 10~l〇〇ym, especially 20~60#m. 光学 The optical film of the present invention uses a width of 1 to 4 m. As far as productivity is concerned, it is preferable to use a width of 1.6 to 4 m, particularly 1.8 to 3.6 m to 55 to 201030075. When it exceeds 4 m, it is difficult to transport. (Extension operation) The elastic modulus of the optical film of the present invention measured at 23 ° C and 55% RH ambient conditions, the film length direction (MD), and the width direction (TD) are all regulated above 3.4 GPA and below 7.0 GPA, TD Elasticity/MD elastic modulus = 1.05~2.0. In terms of stability of the stretching operation, avoidance of cracking, etc., the regulation elastic modulus is preferably 3.4 GPA or more and 4.5 GPA or less. The optical film is preferably formed by the following extension operation using the structure of the present invention. The stretching operation can be extended sequentially or simultaneously for the MD direction and the TD direction of the film. The extension ratios of the mutually perpendicular biaxial directions are respectively 1.07 to 2.0 times for the MD direction, 1.07 to 2.0 times for the TD direction, and 1.0 7 to 1.5 times for the MD direction, for TD. The direction is preferably in the range of 1.07 to 2.0 times. The method of extending the primer is not particularly limited. For example, a plurality of rollers are given a circumferential speed difference, and the circumferential speed difference is used to extend the direction between the rollers toward the MD direction, and both ends of the primer are fixed by clips or pins, and the distance between the clips or the needles is oriented. It is possible to expand the method of extending in the MD direction, and to expand the TD direction in the same manner in the width direction, or to expand the MD/TD direction in both MD/TD directions. Of course, the above methods can also be used in combination. Further, when the so-called widening method is employed, the clip portion can be smoothly driven by the linear driving method, and the risk of cracking or the like can be reduced. -56- 201030075 In the film forming step, it is preferable to use the expander for the wide-width retention or the extension of the width direction, and a needle expander or a clamp expander can be used. The film transport tension in the film forming step in the expander varies with temperature, preferably 120 N / m to 200 N / m, more preferably 140 N/m to 200 N/m, especially 140 N/m to 160 N/m. For the best. When the glass transition temperature of the film of the present invention is Tg, when it is extended, it is preferably heated in the range of (Tg-30) to (Tg+100) °C and extends in the MD direction or the φ TD direction, wherein (Tg- 20) It is preferred to extend in the range of ~(Tg+80) °C. The Tg of the optical film can be controlled by the type of material constituting the film and the ratio of the constituent materials. In the use of the present invention, the Tg of the film at the time of drying is preferably 110 ° C or more, more preferably 120 ° C or more. When the optical film of the present invention is used in a liquid crystal display device, when the Tg of the film is lower than the above range, it is affected by the temperature or humidity of the use environment and the thermal energy of the backlight, and affects the orientation of the molecules fixed inside the molecule. Increasing the block 値φ and the possibility of a large change in the dimensional stability or shape of the film. Also, the shape of the film may not be maintained. On the other hand, when the Tg of the film is too high, the decomposition temperature of the film material is approached, so that it is difficult to manufacture, and the material itself is decomposed during film formation, and there are problems such as a volatile component or coloration. Therefore, the glass transition temperature is preferably below 180 °C, and preferably below 150 °C. The Tg of the film at this time can be obtained by the method described in JIS K71 21 or the like. In the present invention, when the temperature is extended, the temperature is not particularly limited, and when the temperature is 15 or more, the haze stability can be improved. -57- 201030075 After the optical film is stretched, it is preferably heat-fixed. The temperature of the heat setting is higher than the temperature in the final TD direction, and in the temperature range below Tg-20 ° C, the heat setting is generally performed in the range of 〇 5 to 300 seconds. In more than one field, it is preferable to heat-fix the temperature in the range of 1 to l 〇〇 ° C. The heat-fixed film is usually cooled to a temperature below Tg, and the clips at both ends of the film are cut off. The winding portion is taken up. At this time, in the temperature range of Tg or more below the final heat setting temperature, it is preferable to use 0.1 to 10% relaxation treatment in the TD direction and/or the MD direction. The final heat setting temperature is Tg, and it is preferably cooled slowly at a cooling rate of 100 ° C or less per second. The cooling and relaxation treatment is not particularly limited, and can be carried out according to a generally known method, particularly in the field of plural temperatures. Perform the above cooling in sequence In terms of improving the dimensional stability of the film, it is preferable that the cooling rate is assumed to be the final heat setting temperature T1, and the time from the final heat setting temperature to the Tg is t, by the formula (Tl-Tg) / t The optimum conditions for the heat setting conditions, cooling, and relaxation treatment conditions vary depending on the type of the cellulose ester or the plasticizer constituting the film, and the physical properties of the obtained biaxially stretched film are measured, and moderately adjusted to have Just make the decision with the right features.

When there is a slow phase axis or a phase advance axis in the film surface of the optical film of the present invention, when the angle formed by the film forming direction is 01, ei is preferably above -r and +1° or less, and is preferably -0.5 or more. More than +0.5° is preferred. The 0 1 can be defined as the orientation angle, and 01 can be measured by the automatic double refractometer KOBRA-2 1 ADH 201030075 (product of the prince measuring machine company). When 0 1 can satisfy the above-mentioned relevant conditions, the display image can obtain high luminance, which can suppress or prevent light leakage, and can make the color liquid crystal display device obtain the reproducibility of faithful colors, and the contribution thereof is many. (Physical properties, optical properties) The moisture permeability of the optical film according to the present invention is preferably 4 to 1200 g/m 2 · 24 hr at 4 (TC, 90% RH, more preferably 20 to 1000 g/m 2 · 24 hr, In particular, it is preferably 20 to 8 500 g/m 2 · 24 hr. The moisture permeability can be measured according to the method described in JIS Z 0208. The breaking elongation of the optical film according to the present invention is preferably 10 to 80%, particularly Preferably, the optical film of the present invention has a visible light transmittance of 90% or more, more preferably 93% or more. The haze of the optical film according to the present invention is less than 1 % is preferable, especially 0 φ 〜 〇. 1 % is the best. The optical film of the present invention has a R 〇 of 〇 〜 20 nm and Rt of -20 〜 70 nm as shown by the following formula: Formula (i) Ro= ( nx-ny) xd where (ii) Rt = ( ( nx + ny ) / 2-nz ) xd (wherein, Ro shows the retardation in the plane of the film, and Rt shows the retardation in the thickness direction of the film, Nx indicates the refractive index in the direction of the retardation axis in the plane of the film, ny indicates the refractive index in the direction of the phase axis in the plane of the film, nz indicates the refractive index in the thickness direction of the film, and d indicates the thickness (nm) of the film. -59- 201030075 The radiance can be obtained by, for example, KOBRA-21 ADH (product of Oji Scientific Instruments Co., Ltd.) at a wavelength of 590 nm under the environmental conditions of 23 ° C and 55% RH. To improve the effect of the present invention, the 値 値R 〇 is in the range of 0 to 5 nm, and Rt is preferably in the range of -10 to 50 nm. In order to obtain the above-mentioned retardation 値Ro, Rt, the optical film must have the constitution of the present invention, and the refractive index is preferably controlled by the stretching operation. Functional layer) When manufacturing the optical film of the present invention, before and/or after the extension, an antistatic layer, a hard coating layer, a back coating layer, a slippery layer, an adhesive layer, a shielding layer, Functional layer such as anti-glare layer, anti-reflection layer, and optical anti-reflection layer. "Polarizing Plate, Liquid Crystal Display Device" The polarizing plate of the present invention and the liquid crystal display device using the polarizing plate will be described below. The polarizing plate of the present invention is a polarizing plate which is formed by sandwiching at least one side of a polarizer of the optical film of the present invention. The polarizing plate can be manufactured according to a general method. The polarizing side of the optical film of the present invention is alkali saponified, Impregnation extended in iodine solution At least one side of the polarizer is attached to -60-201030075 using a fully saponified polyvinyl alcohol aqueous solution. The optical film or other optical film can be used on the other side. The commercially available cellulose ester film (for example, Nicole Meinuo) Dak KC8UXKC4UX, KC5UX, KC8UY, KC4UY, KC12UR, KC8UCR-3, KC8UCR-4, KC8UCR-5, KC4FR-1, KC8UY-HA, KC8UX-RHA (all are products of Konica Minolta Optical Co., Ltd.), etc. Be applicable. When the optical film of the present invention is used as the optical film A, the optical film used for the opposite side is used for the optical film on the opposite side, and the retardation in the in-plane measured by the wavelength of 590 nm has an R 〇 of 20 to 200 nm and an Rt of 70 to 300 nm. The optical film of the phase difference function is preferred. The optical film having such a phase difference function is not particularly limited, and can be produced, for example, by the method described in JP-A-2005-196149 and JP-A-2005-2751 04. It is also applicable to an optical film having an optically anisotropic film having an optically anisotropic layer formed by orienting a liquid crystal compound such as a discotic liquid crystal. For example, an optically anisotropic layer can be formed by the method described in JP-A-2005-275083. The above optical film can be used in combination with the optical film of the present invention to obtain a liquid crystal display device having a stable and wide viewing angle. The polarizer of the main constituent elements of the polarizing plate is a component that transmits only the light of the deflecting surface in a certain direction. The typical polarizing photo currently known is a polyvinyl alcohol-based polarizing film, which is dyed with iodine and is used. The dye is dyed with a polyvinyl alcohol film. The polarizer can be formed by a film of a polyvinyl alcohol aqueous solution and dyed by one-axis extension, or by a shaft after dyeing, and it is preferable to use a boride-based durability processor for its use. The film thickness of the polarizer is preferably 5 to 30/zm, and particularly preferably 10 to 20 #m. In addition, the ethylene unit content is 1 to 4 mol%, the degree of polymerization is 2000 to 4000, and the degree of saponification is 99.0 to 99.99 mol, as described in Japanese Laid-Open Patent Publication No. 2003-342322. % of ethylene-modified polyvinyl alcohol is also suitable. Among them, an ethylene-modified polyvinyl alcohol film having a hot water cut-off temperature of 66 to 73 ° C is preferred. Further, it is preferable that the hot water cutting temperature difference between the two points in the TD direction of the film of 5 cm is 1 ° C or less, which is preferable in terms of reducing the color unevenness. In addition, the hot water cut-off temperature difference between the two points of the film in the TD direction of 1 cm is preferably 0.5 ° C or less, which is preferable in terms of reducing the stain. The use of the polarized photopolymer of the ethylene-denatured polyvinyl alcohol film has excellent polarizing performance and durability, and the number of spots is small, which is most suitable for use in a large liquid crystal display device. In general, according to the above-mentioned polarizer, the two sides or the sheet surface are attached to protect the film to provide a polarizing plate. When the adhesive is applied, for example, a PVA-based adhesive or a urethane-based adhesive is used, and a PVA-based adhesive is preferably used. (Liquid Crystal Display Device) The liquid crystal display device of the present invention can be produced by mounting the polarizing plate of the present invention on the liquid crystal display device. The optical film of the present invention can be used for STN, TN, OCB, HAN, VA (MVA, PVA). ), liquid crystal display devices of various driving methods such as IPS. Especially suitable for use in VA (MVA, PVA) type and IPS type liquid crystal display devices. In particular, when the polarizing plate of the optical film of the present invention is used in a large-screen liquid crystal display device, excellent front contrast can be imparted. -62- 201030075 The screen is in the 17th or higher type, in particular, in the liquid crystal display device of the large screen of the 3〇 type or larger, except for the effect of the present invention, since there is no distortion such as uneven color or wavy unevenness, Watching TV eyes for a long time will not cause fatigue. [Embodiment] Embodiment φ The present invention is specifically described by the following examples. The invention is not limited to the scope of the embodiments. &lt;Synthesis of the compound of the general formula (1)&gt; (Synthesis of the additive T-1) In a four-necked flask equipped with a thermometer, a stirrer, and a reflux condenser in an amount of 3 L, 310 g (5 m) was placed. Ethylene glycol, 236 g (2 mol) of succinic acid, 610 g (5 mol) of benzoic acid, 0.086 g of tetraisodecyl propyl titanate as a catalyst for esterification, stirring in a nitrogen stream The temperature was gradually raised to 220 ° C, and then the reaction was carried out at 220 ° C, and the dehydration condensation reaction was carried out for 15 hours in total. After the reaction, the unreacted ethylene glycol was distilled off under reduced pressure at 200 ° C to obtain an esterified additive T-1. (Synthesis of Additive T-2) A four-necked flask containing a thermometer, a stirrer, and a reflux condenser in an amount of 3 L was placed in 300 g (5 mol) of 1,2-propanediol and 232 g (2 m). Maleic acid, 890 g (5 mol) of p-t-butylbenzoic acid-63-201030075, 0.08 6 g of tetraisopropyl titanate as a catalyst for esterification, stirring under a nitrogen stream The temperature was gradually raised to 22 (TC, and then reacted at 220 ° C, and the dehydration condensation reaction was carried out for 15 hours in total. After the reaction, unreacted 1,2-propanediol was distilled off under reduced pressure at 200 ° C to obtain an esterified product. Additive T-2 (Synthesis of Additive T-3) The content of the thermometer, stirrer and reflux cooler is 3L. In a four-necked flask, 300g (5m) of 1,3-propanediol, 23 2g (2 mol) of fumaric acid, 681 g (5 mol) of o-toluic acid, and 0.086 g of tetraisopropyl titanate as a catalyst for esterification, and gradually heated to 220 under stirring in a nitrogen stream. °C, then at 220 ° C, a total of 15 hours of dehydration condensation reaction. After the reaction, distilled at 200 ° C under reduced pressure to remove unreacted 1,3-propanediol, The ester-containing additive T-3 is obtained. (Synthesis of the additives T-4 to T-34) Θ The additive T-4 is followed by the above-mentioned additives T-1 to 3, according to the same molar number according to Table 1 and Table 2. The synthesis is performed as shown in the change of the raw material type. -64- 201030075

/*~Ν 氍fr 11 氍瀣鍫氍观浒1 氍1 i ΚΙ 1 ffl- &amp; 11 缲ffi-1 1 paste m Μ 氍氍氍11 11 趦氍氍氍氍fig I 1 擀1 full 1 氍氍氍氍银a| 11 11 枨拼11 m ΗΛ Length 11 11 氍1τ\Κ 1 识ml Ηΐ| 値nJ ϋΐ| Beer + 葙饀af _ | | &amp; S ^ 1 1 E 1 11 11 ig ο 11 Κ 1 m r0 slightly I Itfr/ E τ twist · &amp; 氍氍黢鼪勡m poke a 氍a poke a poke a paste turn 1 1 1 11 11 11 1 1 η 1.1 1 11 11 II 11 11 H 11 11 11 η Κ) 1 1 Wi 11 氍 EE: 卜卜 m 卜 卜 E E E E E E E E E E E E E E E E E E 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 inch 1 ΓΟ 1 ro 1 1 1 CN 1 m 1 CN 1 m 1 m CN ^ Ν3 1 ^ 1—^ TH (N TH r—Η 1—Η r—Η CV &lt;N &lt;N &lt;N 氍1- 饀PQ 氍瀣η- m fr 瀣fr 氍 氍 fight ffi- 擀E- 氍氍齄 HI 氍氍揪擗 氍氍揪擗 擀 擀 m 浒m 趑氍擗擀擀饀鍫氍 her 1 1 ffl- fr 1 B- 1 E- 1 ffi- 1 IE m dust fr 1 &amp; 1 fr 1 ffl- dripping doubt spelling 11 K] w loading κι 擀擗ύ age 浒掸m 黯μ 1 CS 1 m 1 inch 1 Vr&gt; 1 *〇卜1 〇〇1 〇\ 1 〇1 1 CN 蒙 m 1 inch 1 1 VO i 卜r·^ 1 〇〇1 〇\ 1 Ο &lt;Ν I r«H (N 1 (N CS H -1 65 65 65 Η 65 65 65 65 Η Η HH Teng-65 - 201030075 &lt; 氍氍氍η- l· 经 11 擀 1 1 1 擀 1 1 ]氍氍趦趦趑趦mmm 氍1 ml 11 11 m 菡 菡 饀 | ΐ ΐ ΐ ΐ 1 1 1 1 1 1 ϊϋ 1 V〇&amp; 1 1 ο τ**Η ά 11 1 1 1 m 11 11 Survey 1 m El· ii 1 ru 1 斋1 00 rH a 1 1 &amp; 11 11 遁&lt; S 鮏 豳am Ml 1 ή m 1 1 屮1 Os ί 1 1 11 11 11 π &amp; K) β- Ο (Ν K1 Κ1 Κ) Ε: r 1 m 1 CN| 1 &lt;N r*^ r\ 11 111 Ξ Π Π1 氍氍瀣饀氍氍糊氍氍瀣饀氍氍秘氍饀瀣氍氍&amp; E- fr crocodile E-ffi- ffi- E- 擀擀浒擀浒 age KI 擀擗擀擗浒 acid JMJ m inch oo ο 〇 (蘅 inch蘅(N 1 CN 1 cs 晒 CN| 1 CN 1 CN 1 &lt;N t &lt;Τ) Curry 1 cn 1 m 1 m 1 HHHHHHE-1 Η Η Η Η Η Teng-66 - 201030075 &lt;Optics Production of Films A flowchart of a device for producing a cellulose ester film used in the examples is shown in Fig. 1. (Production of Optical Film F-1) (Potassium Dioxide Dispersion) Vapor Processed White Carbon Black 972V (product of Japan Aerosil Co., Ltd.) φ 1 〇 by mass (the average particle size of primary granules is 16 nm, appearance) 90 g/L of specific gravity 90 parts by mass of ethanol The above components were stirred and mixed for 30 minutes with a bar for dissolution, and then dispersed using a Manton-Gaulin mill. 88 parts by mass of methylene chloride was placed in the cerium oxide dispersion under stirring, and the mixture was stirred and mixed for 30 minutes with a dissolution bar to prepare a cerium oxide dispersion diluent, which was then diluted and diluted using the fine particles shown in FIG. Liquid filter • Filter (1) 4 ) (Advantech Toyo Co., Ltd. product · Polypropylene coil plasticizing cartridge filter TCW-PPS-1N) filtered. (Online system added liquid modulation)

TmUVIN92 8 (Products of Ciba and Japan) 15 parts by mass Methylene chloride 100 parts by mass The components are placed in a closed container, completely dissolved by heating and stirring, and then filtered. Wherein, 3 parts by mass of the cerium oxide dispersion diluent-67-201030075 was added under stirring, and after stirring for further 30 minutes, 6 parts by mass of the following cellulose triacetate was added under stirring, and the mixture was further stirred for 60 minutes, and then used online. The liquid infusion sprinkler (8) (Finemet NF of Japan Seiki Co., Ltd.) was used to filter the on-line addition liquid. The filter material uses a nominal filtration accuracy of 20/zm (coating paint composition)

Cellulose ester (cellulose triacetate synthesized from cotton linters, acetamidine: 61.5% 'Mw = 290000) 100 parts by mass of additive τ -1 10 parts by mass of dichloromethane 430 parts by mass of ethanol 40 parts by mass of the above ingredients After being placed in a closed container, it was completely dissolved by heating and stirring, and then filtered using an Anion filter paper No. 24 (product of Aniso Industries, Inc.) to prepare a coating paint.

Then, the on-line addition liquid was filtered using an in-line addition liquid infusion filter (8) (Finemet NF of Nippon Seisakusho Co., Ltd.). The nominal filtration accuracy of the filter media is 20&quot;m. For 100 parts by mass of the filter coating paint, add 2.5 parts by mass of the filter-line addition liquid, and mix thoroughly using the in-line mixer (10) (Toray static in-line mixer Hi-Mixer, SWJ). Using a strip casting device, it was uniformly cast on a stainless steel belt holder (101) at a temperature of 35 t and a width of 1.8 m. On the stainless steel belt holder (101), the amount of residual solvent was made 100% and the solvent was evaporated to remove the solvent from the stainless steel belt holder (1 〇 1 ). The stripped fiber -68- 201030075 The ester film base material was evaporated at 35 ° C, and cut into a width of 1.65 m. Then, the expander was used to extend toward the TD direction (the width direction of the film). Dry at a drying temperature of 1 60 ° C at 5 times. The amount of residual solvent at the time of extension using the expander was 20%. Then, after drying in a 120 t drying apparatus (105) under a plurality of rolls for 15 minutes, the cutting was made into a width of 2.2 m, and both ends of the film were applied with a width of 15 mm and a height of 10/zm, and wound up on the core. On top, the optical film F-1 is obtained. The optical film had a residual φ dose of 0.2%, a film thickness of 60/zm, and a roll length of 6000 m. Further, the stretching ratio in the MD direction was calculated to be 1.00 times from the rotation speed of the stainless steel belt holder and the conveying speed of the expander. &lt;Measurement of elastic modulus&gt; According to ISO 527-3, using a tensile tester (product of Toyo Seiki Seisakusho Co., Ltd.), the film length direction (MD) at 23 ° C and 55% RH In the direction), the tensile test is carried out in two directions in the width direction (TD direction), and the modulus of elasticity is obtained from the strength data of 10% strain. The elastic modulus of the optical film F-1 in the MD direction was 3.6 GPA, the modulus in the TD direction was 4.0 GPA, and the TD modulus/MD modulus was 1.1. (Production of Optical Films F-2 to F-54) The types of additives, the amount of addition, the extension conditions in the width direction (temperature, magnification), the film thickness, and the width of the product were changed as shown in Tables 3 and 4. The optical films F-2 to F-54 were produced in the same manner as above. -69-201030075 &lt;Production of Polarizing Plate&gt; The optical films F-1 to F-54 prepared above were subjected to alkali treatment for 90 seconds in a 2.5 mol/L sodium hydroxide aqueous solution at 40 °C. Then, it was washed with water for 45 seconds, neutralized with 10% by mass of hydrochloric acid at 30 ° C for 45 seconds, and then washed with water at 30 ° C for 45 seconds, and subjected to saponification treatment to obtain an alkali-treated film. Subsequently, a l2 〇/zm thick polyvinyl alcohol film was uniaxially stretched (temperature ll 〇 ° C, stretching ratio 6 times), and then immersed in iodine from 0.075 g _, 5 g of potassium iodide, l 〇〇 The aqueous solution of g water was immersed in an aqueous solution of 68 ° C composed of 6 g of potassium iodide, 7.5 g of boric acid, and 100 g of water. Then, it was washed with water and dried to obtain a polarizer of 3.0 m width. Next, the optically-reactive film (1) obtained by the following method is saponified according to the above method, and a fully alkalized polyvinyl alcohol 5% aqueous solution is used as an adhesive, and optical film F-1 to F-54 is used for polarizing. The optically-reflective film (1) was laminated in this order to obtain polarizing plates 1 to 54 on the visual side. (Production of optically active film (1)) &lt;fine particle dispersion&gt; Fine particles (Aerosil R972V, product of Japan Aerosil Co., Ltd.) 1 1 part by mass of ethanol, 8 parts by mass, the above components are dissolved After mixing for 50 minutes with a stick, 'Disperse using a Monton colloid mill. -70- 201030075 &lt;On-line addition liquid&gt; The following cellulose acetate propionate was added to a dissolution tank containing methylene chloride, and after heating to completely dissolve it, an Aniso filter paper No. 244 was used. (Augmented filter paper (stock) company products) filtered. The filtered cellulose ester solution was slowly added to the fine particle dispersion with sufficient stirring. The ultrafine attritor is then used to disperse into secondary granules of a predetermined size. Then, it was filtered with Finemet NF (manufactured by Nippon Seisaku Co., Ltd.) to prepare an in-line addition liquid. 99 parts by mass of cellulose acetate propionate (the degree of substitution of ethyl ketone is 1.90, the degree of substitution of propyl thiol is 0.60, the degree of substitution of total thiol group is 2.50 4 parts by mass of the dispersion of fine particles 11 parts by mass The main coating liquid of the following composition is first added with dichloromethane and ethanol in a pressurized dissolution tank, and the cellulose acetate propionate is put into a pressurized dissolution tank with a solvent under stirring. The mixture was completely dissolved in a solution, and filtered using an Anime filter paper No. 244 (product of Anji filter paper) to prepare a coating liquid for the master coating. &lt;Composition of the main coating paint liquid&gt; 80 parts by mass of 70 parts by mass of cellulose acetate propionate (the degree of substitution of ethyl ketone is 〇.7〇, the degree of substitution of total thiol is 2.60) trimethylolpropane tribenzoic acid vinegar 1.90, C Brewing base 1 〇 0 parts by mass 15 parts by mass - 71 - 201030075 The above ingredients are put into a closed container, 'heated, completely dissolved after stirring', and filtered using an Anal filter paper N〇.24 (Anji filter paper company) The coating paint solution is prepared. In the case of Finemet NF (product of Nippon Seisen Co., Ltd.), the paint liquid was applied. In the in-line system, the line addition liquid was filtered using Finemet NF (product of Nippon Seisen Co., Ltd.). The filtered coating paint liquid is 00 parts by mass, and 2 parts by mass of the filtered in-line addition liquid is added, and the mixture is thoroughly mixed using an in-line mixer (Toray static in-line mixer Hi-Mixer, SWJ), followed by Using a strip casting device' at a temperature of 3 5 ° C and a width of 2 · 0 m, it is first extended on a stainless steel belt holder. The residual solvent amount is 120%, and the solvent is evaporated on the stainless steel belt support. Then, it is peeled off from the stainless steel belt support. The stripped cellulose ester base material is evaporated at 50 ° C, and cut into a width of 1.9 m, and then 'with the expander in the TD direction, 160. (: The extension was extended by 1.7 times. The drying was carried out in a drying field of 120 ° C by a plurality of rolls, and cut into a width of 3. 〇m, and the width of both ends of the film was 15 mm, and the average value was ΙΟ/ Im carved flower processing, making an optical rotation cancellation with an average film thickness of 40#m Film (1). The film was taken up to a length of 6000 m. The retardation film of the optical-releasing film (1), Ro was 60 nm, Rt was 13 Onm 〇 &lt;Manufacturing of liquid crystal display device&gt; The liquid crystal panel for the viewing angle measurement is evaluated as a characteristic of the liquid crystal display device. -72- 201030075 The visual side of the SONY 40-type display device KLV-4〇J3000 of the VA type liquid crystal display device is attached in advance. The polarizing plate was peeled off, and the polarizing plates 1 to 54 prepared above were attached to the glass surface of the liquid crystal body in a uniform shape with the absorption axis of the polarizing plate to form a VA liquid crystal display device. At this time, the optically-reactive film (1) is attached to the liquid crystal side. Evaluation Φ (Polarization of photorefractive) For the polarizing plate prepared above, the parallel transmittance and the straight transmittance are measured first, and then calculated according to the following formula. Polarized. Then, each of the polarizing plates was forcibly deteriorated at 60 ° C and 90% RH for 1 hour, and then the parallel transmittance and the straight transmittance were measured, and the degree of polarization was calculated according to the following formula. Then, the amount of change in the degree of polarization is obtained by the following formula. Polarization P=( (H0-H90) / ( H0 + H90 ) ) 0.5x100 Change in degree of polarization = Ρ〇 - Ρ 1 000 H0 shows parallel transmittance H90 shows straight transmittance P0 shows the degree of polarization before forced degradation P 1 000 The degree of polarization after 1 hour of forced deterioration indicates that the rate of change of the degree of polarization is less than 10%. △ The rate of change of the degree of polarization is more than 10% and less than 25%. X shows a change rate of the polarization of 25% or more. (Quality change) -73- 201030075 The optical film was cut into a width of 40 mm x 120 mm in the longitudinal direction, and the optical film was conditioned for 24 hours at 23 ° C and 55% RH, and then the quality was measured. (J0). Next, the sample was placed under an environmental condition of 80 ° C and 90% RH for 2 weeks, and then the film was conditioned for 24 hours under the above-mentioned environmental conditions of 23 t and 55% RH, and the quality was measured. ), and according to the following formula, the mass change rate (%) ° mass change rate (%) = { (J1-J0) / JO} X100 (evaluation of the front contrast of the liquid crystal display device) Evaluation of the front contrast using the EZ-comparator (Products of ELDIM Co., Ltd.) The amount of transmitted light in the case where the film surface is orthogonal to black and white is measured. The face-to-face assessment is calculated by comparing positive comparisons. Front contrast = (light transmission in white) / (light transmission in black). -74- 201030075 ··s [s] preparation test | the present invention j | the present invention I 1 the invention I the invention # invention I l the invention l L the invention " 丨 the invention" 丨 the invention | 丨 the invention 1 1 invention 1 丨 发明 」 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Invention 1 l The present invention J This invention is compared to 〇〇oooooogi § Ο i〇〇〇丨1000" ο in σ» o I 1000 1 ο | 1000 | 95〇J oo 1 1000 I 1 1000 I iogoso 8 | 1000 0 m 01 950 1 mass change 1 S 〇0.40 I 0.20 0.30 : 0-30 IL:〇! 1 L 0.50 I 1 0.30 I 丨0.40 1 L〇-5〇1 1 0.20 IL〇^〇1 oo 1 0.35 IL 0.40 I 0,50 L〇-25 I l 0.20 IL 〇,3〇I ! 0.40 I 0.50 oo 0,30 1 0.35 0*25 oo 0,45 丨 Polarizer 1 Degradation 〇〇〇〇〇〇〇0 〇〇D 〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇〇Product width 1 -5 CM o CM o CM o OI CM CV) &lt;SI C«J CS* CM CM in CM u&gt; M u&gt;&lt; S1 m in &lt;S1 ΙΑ CM in in csi o CO o CO o CO o to o Γ0 o to o CO in M in N IO CM film thickness (Jttfll) S sss 〇oo Ο Ο § o 〇〇o § S sss S ss 3 s 3 ss TD/1ID two g 卜 V- s 2* s 卜 · inch ω g 2·3 卜 &lt;〇卜g r-· r~ g ·* r—film elastic modulus ο Ο CO CQ ov to o 兮o ο CM 〇〇o CO O) To 〇&gt; ΓΟ CN| o ο CO o CM oo section o 4.0 ο as κο CO (O CO &lt;〇CO (O CO u&gt; cn u&gt; i〇. cn 卜 to (Ο CO ir> (O cn iO Γ〇 Γ〇 CD CO 卜«η u&gt; Γ0 卜 PO &lt;〇ro 09 to (O eo IO ΓΟ iO Γ0 (O ¢0 Γ* to (O Γ0 卜 Cf> (O wide (MD) extended conditional magnification s S so «r·· ss S sssssss S sssss S sssssss temperature (*c) s S ssssssssssss S ssso &lt;〇s «F» ossssso (O ss plasticizer added i 1 1 1 1 1 1 1 ! 1 1 1 1 1 I 1 1 I 1 1 1 1 1 i 1 1 Additive number 1 1 ] 1 1 1 ! 1 1 1 1 1 ! I 1 1 1 1 1 1 i I ! 1 1 Addition 10% 10% 10 % 10% 〇10% to% .10% times ο 10% i I 10% I 10% | ίο% | 1 to% | | to%" times o 10% 10% 10% 10% Ϊ0% 103⁄4 10% 10% 10% Additive number il·- CM 1 CO 1 1-inch 1 H in 1 卜&lt;£&gt; IH 卜1 ί— 00 1 h O) 1 h 1 1 CM 1 Γ0 1 HN* I h- in 1 1- (O 1 hr* l Bu CO 1 σ&gt; 1 1-S 1 1- ll·- «Μ 1 1- CO &lt;SI 1 H 1 l·- to CM i H To CM I μ s 1 h Film number 1 u. Cs* 1 U- CO 1 u. Inch 1 u. in ! Ll &lt;0 1 IL· Bu 1 u. CO 1 IL· 〇1 u. ο Τ U. T U- CM U U- Γ 0 XL XL · T ll IO T li. (OT u. r* T U- F-18 O) T u. S 1 u. Fi 1 ll. csj CSI I Ll. Γ0 CM 1 Ll z 1 Ll \Λ CJ 1 U- CM 1 Li. F-27 -75- 201030075 S mm extraction s: s 皤SS level cascading m 皤皤睇m 钿u :钐: age 皤锊锊3⁄4 Women «· speak 3⁄4 a M Jj ±1 * sister 锊锊Ϊ 4 contrast 1000 1000 ! 1000 s 7 | 1000 1 1000 1000 ο ο O 00 1 900 1 O ss 〇&gt; O oo 700 s (D g CO 700 1 900 950 900 ο (Ο 1000 1050 1000 1000 1000 1000 s ^ 0.30 1 in oa ο o in o 0.25 0.25 § ο g 0. 65 0.60 0. 55 go Calling through - LO 1 〇0. 60 0. 65 s 0. 30 0. 20 so 0. 40 o 0. 25 mi vP 〇〇〇〇〇〇〇X &lt; 0 〇〇&lt;&lt;1 XXX &lt;3 &lt;3 &lt;3 X 〇〇〇〇〇〇w 1C L〇〇〇in 〇ο Dg 3 c&gt ;am 腹 腹 μ μ § § § § § § § § H »-ί »—4 τΉ — CQ &lt;N rH *—· τ*Η 11^ 栋· Ο 〇o but O but 〇 inch 却 but CO 卜 卜 卜 CO &lt;N in 00 CNJ Bu 03⁄4 in卜〇 inch eg CO 00 inch inch inch 却 but keep CSJ cut om sleep; the more Ω vn CO iO CO (O CO in CO (Ο CO Ο CO 卜 CO 1 CO 1/3 CO CO r- CO o CO inch CO CO 〇i CQ v~4 in 00 o inch CO CO CO LO 09 i〇CO to en in CO eo * ladder · S sgs S sssso LA 00 § o 沄s S § g § ss S ss S 〇ΙΛ * Φ »-&lt; r^4 03 CO rW *-^ rH ^1 *Ή domain /—S. 1 骢« Ρ « s V 4 s § »^4 oc〇o (O ο to ggso CO SS o 00 m § oosso &lt;〇S ss O to S 1 Add 1 1 1 1 1 1 I 1 1 1 1 1 1 1 I 1 1 1 1 1 1 1 沴Lft in LO in in ΙΟ aoa in m CO inch CN3 CO mm 匾I 1 1 1 1 1 ! 1 1 1 i I 1 1 1 1 1 1 I 1 1 1 T 1 TI 1 s HH PQ PQ PQ a 忒 忒 式 式 式 式 式 式 I LO in 沴沴in in 2? +*&lt; 腾ο oooo ο Ooooooooooooo 〇1 in l curtain 00 CM σ&gt; CN3 宕CO C*) CO 00 CO CO »-H rl fH iH y-\ rH rH rH rH 1C Order — to in T m 1 1 1 1 1 1 1 i 1 1 1 1 1 1 1 1 1 1 I 1 I 1 1 1 1 1 1 Η H h HH h HHHHHHHH hhh H h H h HHHH h mw 00 CNJ 1 σ&gt; ca II «-Η CO I eg CO I CO CO | 守CO I in C〇| (D CO | 1 00 CO 1 Oi CO | § ) j CSJ inch I CO 呀 I \ IA I &lt;〇1 I GO 兮1 03⁄4 I s I » CsJ tn CO un 1 1C 1 鰊黯U&gt; iu lu u» (3⁄4 lu CL| lu Um iu ir, Cx&lt; tl4 U( Cl. Um 1 tin 1 U4 1 Cl. 1 tu 1 Cl4 1 tL, 1 1 Ul 1 tu 1 Cr, -76- 201030075 From the results of Table 4' Table 4, it is understood that the optical film of the present invention has excellent photon degradation and film quality change characteristics under moist heat conditions, and its front surface contrast is also high. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a flow chart showing a method of producing an optical film of the present invention. Φ [Description of main component symbols] 1 : Main coating paint blanking tank 2: Coating paint infusion pump 3 : Coating paint static kettle 4 : Main filter 5 : Coating paint filter 6 : Online adding liquid kettle 7: On-line system addition liquid circulation filter Φ I-line system addition liquid delivery filter 9: On-line system addition liquid infusion pump 1 〇: Static type mixer 1 〇1 _·Stainless steel belt 102: Peeling roller 103: Film 104: expansion Amplifier, drying device 105: roller conveying and drying device 106: film winding device-77-

Claims (1)

201030075 VII. Patent application scope: 1. An optical film characterized by containing at least the following optical film of a compound represented by the general formula (1) and a cellulose ester, and the optical film is in an environment of 23 ° C and 55% RH. The measured elastic modulus is 3.4 GPA or more in the film length direction (MD) and film width direction (TD), and the TD modulus/MD modulus is 1.05 to 2.0 in the case of 7.0 GPA or less, and the general formula (1) B- (GA) nGB (wherein B represents a benzene monocarboxylic acid residue, and G represents an alkane &amp; alkylene glycol residue having 2 to 12 carbon atoms or an aromatic diol having a carbon number of 6 to 12 ( An aryl glycol ) residue or an oxyalkylene glycol residue having a carbon number of 4 to 12, and A represents a dicarboxylic acid residue having a carbon number of 4 to 12 or a carbon number of 6 to 12 The aryldicarboxylic acid residue, η represents an integer of 0 or more). 2. The optical film of claim 1, wherein the optical film has a width of 1.6 to 4 m, and at least one of a film length direction (MD) and a film width direction (TD) is extended to 1.07 to 2.0 times. . _ 3. A polarizing plate characterized in that an optical film according to item 1 or item 2 of the patent application is used on at least one side of a polarizer. -78-