TW200819874A - Optical film, manufacturing method of optical film, retardation film, polarizing plate and liquid crystal panel - Google Patents

Abstract

The invention provides an optical film from which a film having uniform optical axes can be obtained by stretching treatment and to provide a manufacturing method of the optical film. The optical film which is made of a cyclic olefin resin and in which, when the optical axis is measured over the whole width direction of the film, an extent where the optical axis is within ± 5 degree to a longitudinal direction of the film is 80% or more of whole width of the film, is provided. Further the manufacturing method of the optical film, in which a draw down ratio h is 6.5 or more when the cyclic olefin resin is melted, is extruded from a die and is brought into press-contact with a cooling roll to form the film, is provided.

Description

[Technical Field] The present invention relates to an optical film comprising a cyclic anahydrocarbon resin, a method for producing the same, a retardation film using the optical film, a polarizing plate, and a liquid crystal panel. [Prior Art] The cyclic olefin resin is excellent in transparency, heat resistance, moisture resistance, and the like, and is suitable for use in an optical film. Usually, a film made of a cyclic olefin resin is formed by a solution casting method (solution casting method) or a melt extrusion method, but from the viewpoint of productivity, it is particularly preferable to use melt extrusion. law. The optical film is subjected to a stretching treatment after molding, and is used as a film having optical characteristics such as a phase difference film. As the characteristics required for the retardation film, in addition to transparency, specific phase difference, and the like, it is also possible to change the optical axis. If the optical axis changes, the result is that display unevenness occurs when used in a liquid crystal display device. Therefore, various types of stretching methods were reviewed, and a review for obtaining a film having less variation in optical axis was performed. However, the fluctuation of the optical axis is also caused by the green film before stretching, and the melt extrusion method for forming a green film having little variation in the optical axis after stretching does not exhibit sufficient performance. [Patent Document 1] JP-A-2005-35 45 8 1 7 SUMMARY OF INVENTION Technical Problem The object of the present invention is to provide an optical film having a uniform optical axis by stretching treatment. a film, and a method of making the optical film. Means for Solving the Problem The present invention relates to an optical film characterized in that a film composed of a cyclic olefin resin has an optical axis within ±5° of the film length direction when the optical axis is measured over the entire width direction of the film. The range is more than 80% of the full width of the film. According to the invention, in the method of producing an optical film according to the first aspect of the invention, the cyclic olefin resin is melted, extruded from a die, and pressed against a cooling roll to form a film. The indicated draw down ratio h is 6.5 or more. Drawdown ratio h = film thickness at the time of extrusion from the die exit / film thickness of the obtained film in the optical film manufacturing method of the present invention, the resin extruded from the die is initially pressed The surface temperature of the first cooling roll is preferably in the range of the glass transition temperature (Tg) of the resin within ±5 t. Further, in the method for producing an optical film of the present invention, the speed ratio of the peripheral speed v 1 of the first cooling roll to the peripheral speed v2 of the second cooling roll or the cooling belt disposed adjacent to the first cooling roll vs (v2/) Vl) is better in the range of 1.01 to 1.06. Further, in the method of producing an optical film of the present invention, the surface of the first cooling roll is preferably ceramic. -5- 200819874 Next, the present invention relates to a retardation film obtained by further stretching the above optical film. Next, the present invention relates to a polarizing plate characterized by laminating an optical film of the present invention and/or a retardation film of the present invention on at least one side of a polarizing plate. Next, the present invention relates to a liquid crystal panel characterized in that a polarizing plate of the present invention is laminated on at least one surface of a liquid crystal display element. EFFECT OF THE INVENTION According to the present invention, it is possible to provide an optical film which can obtain a film having a uniform optical axis by a stretching process, and a method of producing the optical film. The retardation film obtained by stretching the optical film is stable in that the phase difference or the optical axis does not fluctuate, and a large-screen liquid crystal display or the like using the same can achieve high performance without distortion or unevenness. [Embodiment] The best mode for carrying out the invention <<Optical film and method for producing the same>><Ring olefin-based resin> The cyclic olefin-based resin used in the optical film of the present invention is exemplified A resin having a structural unit derived from a compound represented by the following formula (1) (hereinafter also referred to as "specific monomer"). 200819874

(In the formula (1), R1 to R4 are a hydrogen atom, a halogen atom, a hydrocarbon group having 1 to 3 carbon atoms, or another monovalent organic group, and may be the same or different. Further, any of R1 to R4 is 2 The individual may also be combined to form a monocyclic or polycyclic structure. m is 0 or a positive integer, p is a 〇 or a positive integer). The following (co)polymer is exemplified as the cyclic olefin resin. (1) A ring-opening polymer of a specific monomer represented by the above formula (1). (2) A ring-opening copolymer of a specific monomer and a copolymerizable monomer represented by the above formula (1). (3) The hydrogenated (co)polymer of the ring-opening (co)polymer of the above (1) or (2) (4) The ring-opening (co)polymer of the above (1) or (2) is subjected to Frey Hydrogenated (co)polymer after cyclization by Friedel-Crafts reaction. (5) A saturated copolymer of a specific monomer represented by the above formula (1) and a compound containing an unsaturated double bond. (6) a molding (co)polymer of one or more monomers selected from the specific monomer, the ethylene cyclic hydrocarbon monomer, and the cyclopentane monomer represented by the above formula (1) and It is a hydrogenated (co)polymer. (7) An alternating copolymer of a specific monomer represented by the above formula (1) and a propionate. 200819874 Among these (co)polymers, hydrogenation (co)polymerization using the ring-opening (co)polymer of the above (3) is particularly preferable from the viewpoints of transparency, light resistance, moldability and the like. Things. The structure of the polymer has a structural unit represented by the following formula (2). [Chemical 2]

(2) (In the formula (2), R1 to R4, p, and m are the same as defined in the above formula (1). <Specific monomer> Specific examples of the specific monomer include the following compounds, but the present invention is not limited to these specific examples. Bicyclo[2.2.1]hept-2-ene, tricyclo[4·3.0·12,5]-8-decene, tricyclo[4·4·0·12,5]-3-undecene, four Ring [4·4·0·12,5·17'1()]-3-dodecene, pentacyclic [6.5·1·13,6.02,7·09,13]-4-pentadecene, 5 -Methylbicyclo[2.2.1]hept-2-ene, 200819874 5-ethylbicyclo[2·2·1]hept-2-ene, 5-methoxycarbonylbicyclo[2.2.1]hept-2-ene , 5-methyl-5-methoxycarbonylbicyclo[2.2.1]hept-2-ene, 5-cyanobicyclo[2.2.1]hept-2-ene, 8-methoxycarbonyltetracyclo[4·4 ·0.12'5·17'1()]-3-dodecene, 8-ethoxycarbonyltetracyclo[4·4.0·12,5.17'1()]-3-dodecene, 8-n-propoxy Carbonyltetracyclo[4.4.0.12'5.17'1()]-3-dodecene, 8-isopropyloxycarbonyltetracyclo[4.4.0.12'5.17'1()]-3-dodecene, 8-正Butoxycarbonyltetracyclo[4.4.0.12'5.17'1()]-3-dodecene, 8-methyl-8-methoxycarbonyltetracyclo[4.4.0.12'5.17'1()]-3-Te Diene, 8-methyl-8-ethoxycarbonyltetracyclo[4·4.0.12'5·Γ'1()]-3-dodecene, 8-methyl-8-n-propoxycarbonyltetracyclo [4.4.0.12'5.17'1()]-3-Dodecene, 8-methyl-8-isopropyloxycarbonyltetracyclo[4.4.0.1 2'5.17'1G]-3-dodecene, 8- Methyl-8- Butoxycarbonyltetracyclo[4·4·0·12'5·Γ'1()]-3-dodecene, 5-ethylenebicyclo[2·2·1]hept-2-ene, 8- Ethylene tetracyclo[4.4.0.I2,5·7,1 G]-3-dodecene, 5-phenylbicyclo[2.2.1]hept-2-ene, 8-phenyltetracyclo[ 4·4·0·12,5.Γ,1()]-3-dodecene, 5-fluorobicyclo[2·2·1]hept-2-ene, 5-fluoromethylbicyclo[2.2.1 Hept-2-ene, 5-trifluoromethylbicyclo[2.2.1]hept-2-ene, 5-pentafluoroethylbicyclo[2.2.1]hept-2-ene, 5.5-difluorobicyclo[2.2 .1]hept-2-ene, 5.6-difluorobicyclo[2.2.1]hept-2-ene, -9- 200819874 5.5-bis(trifluoromethyl)bicyclo[2·2·1]heptan-2- Alkene, 5.6-bis(trifluoromethyl)bicyclo[2.2.1]hept-2-ene, 5-methyl-5-trifluoromethylbicyclo[2.2.1]hept-2-ene, 5.5.6- Trifluorobicyclo[2.2.1]hept-2-ene, 5.5.6-tris(fluoromethyl)bicyclo[2.2.1]hept-2-ene, 5.5.6.6-tetrafluorobicyclo[2.2.1]heptane- 2-ene, 5.5.6.6-tetrakis(trifluoromethyl)bicyclo[2.2,1]hept-2-ene, 5.5-difluoro-6,6-bis(trifluoromethyl)bicyclo[2.2.1]g 2-ene, 5.6-difluoro-5,6-bis(trifluoromethyl)bicyclo[2.2.1]hept-2-ene, 5.5.6-trifluoro-5-trifluoromethylbicyclo[2.2. 1] Geng-2- Alkene, 5-fluoro-5·pentafluoroethyl-6,6-bis(trifluoromethyl)bicyclo[2 ·2·1]hept-2-ene, 5.6-difluoro-5-heptafluoro-isopropyl 5--6-trifluoromethylbicyclo[2.2.1]hept-2-ene, 5-chloro-5,6,6-trifluorobicyclo[2.2.1]hept-2-ene, 5.6-dichloro-5 ,6-bis(trifluoromethyl)bicyclo[2 ·2·1]hept-2-ene, 5,5,6-trifluoro-6-trifluoromethoxybicyclo[2.2.1]hept-2- Alkene, 5.5.6-trifluoro-6-heptafluoropropoxybicyclo[2·2·1]hept-2-ene, 8-fluorotetracyclo[4·4·0·12'5·Γ, 1 ( )]-3-dodecene, 8-fluoromethyltetracyclo[4.4.0.12, 5.17,1()]-3-dodecene, 8-difluoromethyltetracycline [4.4.0.12, 5.17,1 ()]-3-dodecene, 8-trifluoromethyltetracyclo[4·4·0·12,5·17,1()]-3-dodecene, 8-pentafluoroethyltetracyclic [4.4.0.12'5.17'1()]-3-dodecene, 8.8-difluorotetracyclo[4.4·0·12,5·17,1()]-3-dodecene, 8.9-difluoro Tetracyclo[4·4·0·12,5·17,1()]-3-dodecene, 8,8-bis(trifluoromethyl)tetracyclo[4.4.0.12, 5.17,1()] -3-dodecene, -10- 200819874 8.9-bis(trifluoromethyl)tetracyclo[4.4.0.12,5.17,1()]-3-dodecene, 8·methyl-8-trifluoromethyl Base four ring [4.4.0.12,5·17,1()]-3-dodecene, 8.8.9-Trifluorotetracyclo[4·4·0·12,5·17,1()]-3-dodecene, 8.8.9-tris(trifluoromethyl)tetracyclo[4.4.0.12, 5.17,1()]-3-dodecene, 8.8.9.9-tetrafluorotetracyclo[4·4_0·12,5_17,1()]-3-dodecene, 8.8.9.9-tetra(trifluoromethyl) Base) tetracyclo[4.4.0.12, 5.17,1()]-3-dodecene, 8.8-difluoro-9,9-bis(trifluoromethyl)tetracyclo[4.4.0_12,5.17,1() ]-3-dodecene 8.9-difluoro-8,9-bis(trifluoromethyl)tetracyclo[4.4.0.12, 5.17,1()]-3-dodecene 8.8.9-trifluoro-9 -trifluoromethyltetracyclo[4.4.0.12,5.17,1()]-3-dodecene, 8.8.9-trifluoro-9-trifluoromethoxytetracyclo[4.LO.l2,5· :!7,1 G]-3-dodecene, 8.8.9-trifluoro-9-pentafluoropropoxytetracyclo[4.4.0.12,5.17,1()]-3-dodecene, 8- Fluorine-8-pentafluoroethyl-9,9-bis(trifluoromethyl)tetracyclo[4.4.0.12, 5.17,1()]-3 _dodecene, 8.9-difluoro-8-heptafluoroiso Propyl-9-trifluoromethyltetracyclo[4.4.0.12,5.17'1()]-3-dodecene, 8-chloro-,8,9,9-trifluorotetracyclo[4.4.0_12,5· 17,1()]-3-dodecene, 8.9-dichloro-859-bis(trifluoromethyl)tetracyclo[4.4.0.12, 5.17,1()]-3-dodecene 8-(2 , 2,2-trifluoroethoxycarbonyl)tetracycline [4.4.0 .12,5.17,1()]-3-dodecene, 8-methyl-8-(2,2,2-trifluoroethoxycarbonyl)tetracyclo[4.4.0.12, 5.17,1()]- 3-dodecene and the like. -11 - 200819874 These can be used alone or in combination of two or more. Among the specific monomers, preferred are the R1 and R3 hydrogen atoms in the above formula (1) or a hydrocarbon group having 1 to 10 carbon atoms, more preferably 1 to 4, particularly preferably 1 to 2, R 2 and R 4 . a hydrogen atom or a monovalent organic group, and at least one of R2 and R4 represents a polar group having a polarity other than a hydrogen atom and a hydrocarbon group, and an integer of the m system 〇 〜3 is an integer of 0 to 3, more preferably m + p = 0~4, especially preferably 0~2, especially preferably m=l, p=0. The specific monomer of m = l and p = 〇 is preferable from the viewpoint that the obtained cyclic olefin resin has a high glass transition temperature and excellent mechanical strength. Examples of the polar group of the specific monomer include a carboxyl group, a hydroxyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, an amine group, a decylamino group, and a cyano group. These polar groups may also be bonded via a linking group such as a methylene group. Combine. Further, a hydrocarbon group or the like which has a polar divalent organic group such as a carbonyl group, an ether group, a decyl ether group, a thioether group or an imine group and which is a linking group is used as a polar group. Among these, a carboxyl group, a hydroxyl group, an alkoxycarbonyl group or an aryloxycarbonyl group is preferred, and an alkoxycarbonyl group or an aryloxy group is particularly preferred. Further, at least one of R2 and R4 is a monomer having a polar group represented by the formula -(CH2)nCOOR, and has a high glass transition temperature and low hygroscopicity from the obtained cyclic olefin-based resin, and various The point of superior adhesion of the material is preferred. In the formula relating to the above specific polar group, R is a hydrocarbon group having 1 to 1 2, more preferably 1 to 4, particularly preferably 1 to 2 carbon atoms, preferably an alkyl group. Further, η is usually 0 to 5, and the smaller the η is, the higher the glass transition temperature of the obtained cyclic olefin resin is, and the more preferable is η, which is a specific monomer of ruthenium, and is easily synthesized therefrom. From the point of view, it is more appropriate. Further, in the above formula (1), R1 or R3 is preferably an alkyl group, particularly an alkyl group having 1 to 4 carbon atoms, more preferably an alkyl group having 1 to 2, particularly preferably a methyl group. In particular, the alkyl group is bonded to the same carbon atom as the carbon atom to which the specific polar group represented by the above formula -(CH2)nCOOR is bonded, and the hygroscopicity of the obtained cyclic olefin resin can be lowered. , is more appropriate. <Copolymerizable monomer> Specific examples of the copolymerizable monomer include cycloolefins such as cyclobutene, cyclopentene, cycloheptene, cyclooctene, and dicyclopentadiene. The carbon number of the cyclic olefin is preferably from 4 to 20, more preferably from 5 to 12. These may be used alone or in combination of two or more. The preferred range of use of the specific monomer/copolymerizable monomer is from 100/0 to 50/50, more preferably from 100/0 to 60/40 by weight. <Open-loop polymerization catalyst> In the present invention, ring-opening polymerization for obtaining (1) a ring-opening polymer of a specific monomer and (2) a ring-opening copolymer of a specific monomer and a copolymerizable monomer The reaction is carried out in the presence of a metathesis catalyst. The metathesis catalyst system (a) is selected from at least one of W, Mo, and Re compounds, and (b) Deming's periodic table ία elements (eg, Li, Na, K, etc.), IIA elements ( For example, Mg, Ca, etc.), Group IIB elements (eg, Zn, Cd, Hg, etc.), Group IIIA elements (eg, b, A1, etc.), Group IVA elements (eg, Si, Sn, Pb, etc.), or Group IVB elements (eg, The compound ' of Ti, Zr, etc.) constitutes a catalyst from a combination of at least one selected from the group consisting of at least one of the element-carbon bonds or the element-hydrogen bond-13-200819874. Further, in this case, in order to increase the activity of the catalyst, the additive (c) described later may be added. Representative examples of the compound of the component (a), such as W, Mo, or Re, include WC16, MoC16, and ReOCl3, etc., JP-A-1-132626, page 8 of the lower left column, line 6 to page 8, upper right column, first The compound described in the 7th line. Specific examples of the component (b) include n-C4H9Li, (C2H5)3A1 '(C2H5)2A1C1 '(C2H5)i sAlCh 5 '(C2H5)A1C12, methylaluminoxane, LiH, etc. The compound described in the third column of the upper right column of the eighth column of the upper right column of the eighth page of the 132626. As a representative example of the component (c) as an additive, alcohols, aldehydes, ketones, amines, and the like are applicable, but it is also possible to use the above-mentioned section of the lower right column of the first page of the eighth page The compound shown on line 17 in the upper left column of page 9. The amount of the metathesis catalyst used is, in the range of the molar ratio of the above component (a) to the specific monomer, "(a) component: specific monomer" is usually in the range of 1: 5 00 to 1:50, 〇〇〇, It is preferably in the range of 1:1,000 to 1:10,000. The ratio of the component (a) to the component (b) is (a): (b) in the range of 1:1 to 1:50, preferably in the range of 1:2 to 1:30. The ratio of the component to the component (c) is, in terms of a molar ratio, (c): (a) is in the range of 0.005:1 to 15:1, preferably in the range of 0.05:1 to 7:1. <Solvent for Polymerization> As a solvent used in the ring-opening polymerization reaction (solvent constituting the solvent of the molecular weight modifier-14-200819874 solution, a specific monomer and/or a catalyst for metathesis catalyst), for example, pentane may be mentioned. An alkane such as hexane, heptane, octane, decane or decane; a cycloalkane such as cyclohexane, cycloheptane, cyclooctane, decalin or norbornane; benzene, toluene or xylene; An aromatic hydrocarbon such as ethylbenzene or cumene; a halogenated alkane such as chlorobutane, bromohexane, dichloromethane, dichloroethane, hexamethylene dibromide, chlorobenzene, chloroform or tetrachloroethylene; a compound such as a halogenated aryl group, a saturated carboxylic acid ester such as ethyl acetate, n-butyl acetate, isobutyl acetate, methyl propionate or dimethoxyethane; dibutyl ether, tetrahydrofuran, dimethoxy An ether or the like of a ethane or the like may be used singly or in combination. Among these, aromatic hydrocarbons are preferred. The solvent: the specific monomer (weight ratio) is usually an amount of 1:1 to 10:1, preferably 1:1 to 5:1. <Molecular weight modifier> The molecular weight of the obtained ring-opened (co)polymer can be adjusted by the polymerization temperature, the type of the catalyst, and the type of the solvent. However, in the present invention, the molecular weight is determined by the molecular weight. The regulator is adjusted by coexisting in the reaction system. Here, as a suitable molecular weight modifier, for example, ethylene, propyl storage, 1-butylene, 1-pentyl, 1-hexyl, 1-glycan, sim, decene, 1-pyrene Among the α-olefins such as olefins and styrene, among them, 1-butene and 1-hexene are particularly preferable. These molecular weight modifiers can be used alone or in combination of two or more. The amount of the molecular weight modifier used is 0.005 to 0.6 mol per 1 mol of the monol monomer for the ring-opening polymerization reaction, preferably ~5 5-15-200819874. (2) In order to obtain a ring-opening copolymer, a ring-opening copolymerization of a specific monomer and a copolymerizable monomer can be carried out in the ring-opening polymerization step, and further, it can also be used in the case of polybutylene or polyisoprene. An unsaturated hydrocarbon having two or more carbon-carbon double bonds in the main chain, such as a conjugated dibasic compound, a styrene-butadiene copolymer, a non-co-diene copolymer, or a raw borneol. The specific monomer is subjected to ring-opening polymerization in the presence of a polymer or the like. The ring-opening (co)polymer obtained as above can be used as it is, but it is obtained by rehydrogenation. (3) The hydrogenated (co)polymer is suitable as a raw material for a resin having high repellency. <Hydrogenation Catalyst> The hydrogenation reaction is carried out by a usual method, that is, adding a hydrogenation catalyst to a solution of a ring-opening polymer to make hydrogen gas at a pressure of 3,000 to 300 atmospheres, preferably 3 to 200 atmospheres. 0 to 200 ° C, preferably 20 to 180 ° C, is carried out in response thereto. As the hydrogenation catalyst, those used in the hydrogenation reaction of a usual olefinic compound can be used. As the hydrogenation catalyst, a heterogeneous catalyst and a homogeneous catalyst can be mentioned. The heterogeneous catalyst may be a solid catalyst in which a noble metal catalyst such as palladium, lead, nickel, ruthenium or iridium is supported on a carrier of carbon, vermiculite, alumina or titania. Further, as the homogeneous catalyst, nickel naphthenate/triethylaluminum, nickel acetylacetate/triethylaluminum, cobalt octoate/n-butyllithium, titanocene dichloride/dibutyl chloride may be mentioned. Lithium monochloride, lanthanum acetate, chlorotris(triphenylphosphine) ruthenium, dichlorotris(triphenylphosphine) ruthenium, chlorohydrocarbonyl tris(triphenylphosphine) ruthenium, dichlorocarbonyl-16- 200819874 tris(triphenylphosphine) )钌. The form of the catalyst can be powder or granular. In the case of such a hydrogenation catalyst, the ring-opening (co)polymer: hydrogenation catalyst (weight ratio) is used in a ratio of 1: lxl (T6 to 1: 2). Thus, by hydrogenation The hydrogenated (co)polymer obtained has excellent thermal stability, and its properties are not deteriorated even when it is subjected to molding or heating as a product. Here, the hydrogenation rate is usually 50%. The above is preferably 70% or more, more preferably 90% or more, and particularly preferably 99% or more. Further, the hydrogenation rate of the hydrogen (co)polymer is measured by 500 MHz and H-NMR. The 値 is 50% or more, preferably 90% or more, more preferably 98% or more, and most preferably 99% or more. The higher the hydrogenation rate, the more excellent the stability to heat or light, and the wavelength used as the present invention is used. In the case of a plate, long-term stability characteristics can be obtained. Further, the hydrogenated (co)polymer used as the cyclic olefin resin is preferably a gel content of the hydrogenated (co)polymer. The weight% or less is particularly preferably 1% by weight or less. Further, as the cyclic olefin resin, (4) the above (1) or (2) may be used. (Co) polymer by Friedel - Clay Ford after cyclization reaction, the hydrogenated (co) polymer. The cyclization method of the Friedel-Crafts reaction of the ring-opening (co)polymer of (Fred-Clayford reaction) or (2) is not particularly limited, and may be A well-known method using an acidic compound described in JP-A-50-1 5 43 99 is used. Specific examples of the acidic compound include Lewis acid and Bronsted acid such as A1C13, BF3, FeCl3, Al2〇3, HCl, CH2C1C00H, diatomaceous earth, and activated clay. The cyclized ring-opened (co)polymer can be hydrogenated in the same manner as the ring-opened (co)polymer of (1) or (2). Further, as the cyclic olefin resin, (5) a saturated copolymer of the above specific monomer and a compound containing an unsaturated double bond may be used. <Compound containing unsaturated double bond> Examples of the unsaturated double bond-containing compound include ethyl bromide, propylene, butylene, and the like, and preferably have a carbon number of 2 to 12, more preferably 2 to 8 carbon atoms. An olefinic compound. The preferred range of use of the specific monomer/unsaturated double bond-containing compound is 90/10 to 40/60, more preferably 85/15 to 50/50 by weight. In the present invention, in order to obtain (5) a saturated copolymer of a specific monomer and a compound containing an unsaturated double bond, a usual addition polymerization method can be used. <Addition Polymerization Catalyst> As the catalyst for synthesizing the above (5) saturated copolymer, at least one selected from the group consisting of a titanium compound, a chromium compound and a vanadium compound is used as an organoaluminum compound as a cocatalyst. Here, examples of the titanium compound include titanium tetrachloride and titanium trichloride, and examples of the chromium compound include bis(cyclopentadienyl)chromium chloride and bis(cyclopentadienyl) chromium. Chloride and the like. -18- 200819874 Furthermore, as a vanadium compound, the general formula VO(OR)aXb or V(OR)cXd can be used [however, the R-based hydrocarbon group, the X-based halogen atom, 0$a^3, 〇$b^3, A vanadium compound represented by 2S(a + b)g3, 0gcS4, 〇S d S 4,3 S (c +d) g 4 ], or such an electron is supplied to the adduct. Examples of the electron donor include an oxygen-containing electron donor such as an ester of an alcohol, a phenol, a ketone, an aldehyde, a carboxylic acid, an organic acid or an inorganic acid, an ether, a guanamine, an acid anhydride or an alkoxysilane. A nitrogen-containing electron donor such as ammonia, an amine, a nitrile or an isocyanate. Further, 'as an organoaluminum compound as a cocatalyst, at least one selected from the group consisting of at least one aluminum-carbon bond or aluminum-hydrogen bond may be used, for example, when a vanadium compound is used, The ratio of the aluminum atom to the vanadium atom (A1/V) is 2 or more, preferably 2 to 50, and particularly preferably in the range of 3 to 20, in terms of the ratio of the vanadium compound to the organoaluminum compound. The solvent for the polymerization reaction used in the addition polymerization may be the same as the solvent used in the ring-opening polymerization reaction. Further, the adjustment of the molecular weight of the obtained (5) saturated copolymer is usually carried out using hydrogen. Further, as the cyclic olefin resin, (6) addition molding of the above specific monomer and one or more monomers selected from the ethylene cyclic hydrocarbon monomer or the cyclopentadiene monomer may be used. Copolymer and its hydrogenated copolymer. -19- 200819874 <Ethylene-based cyclic hydrocarbon-based monomer> Examples of the ethylene-based cyclic hydrocarbon-based monomer include ethylene such as 4-vinylcyclopentene or 2-methyl-4-isopropenylcyclopentene. A vinylated 5-membered cyclic hydrocarbon monomer such as a vinylcyclopentene monomer such as a cyclopentene monomer, 4-vinylcyclopentane or 4-isopropenylcyclopentane, or 4-vinylidene Cyclohexene, 4_isopropylisocyclohexyl, 1-methyl-4-isopropylpyrrolidine, 2-methyl-4-vinylcyclohexene, 2-methyl-4-iso Vinylcyclohexene monomer such as propylene cyclohexene, vinyl cyclohexane monomer such as 4-vinylcyclohexane or 2-methyl-4-isopropenylcyclohexane, or styrene , α-methylstyrene, 2-methylstyrene, 3-methylstyrene, 4-methylstyrene, 1-vinylnaphthalene, 2-vinylnaphthalene, 4-phenylstyrene, p-methoxy Terpene monomer such as styrene monomer, d-pinene, 1-decene, diterpene, d-limonene, 1-limonene, dipentene, etc., 4-vinylcycloheptane Vinylcycloheptene monomer such as alkene, 4-isopropylidenecycloheptene, 4-vinylcycloheptane, 4-isopropenyl Heptane, cycloheptane-based vinyl monomer. Preferred is styrene or α-methylstyrene. These may be used alone or in combination of two or more. <Cyclopentadiene-based monomer> The cyclopentadiene-based monomer used as the monomer of the (6) addition copolymer of the present invention may, for example, be a cyclopentadiene or a 1-methyl ring. Pentadiene, 2-mercaptocyclopentadiene, 2-ethylcyclopentadiene, 5-methylcyclopentadiene, 5,5-methylcyclopentadiene, and the like. Preferred is cyclopentadiene. These may be used alone or in combination of two or more. The above-mentioned specific monomer, the addition (co)polymer of one or more kinds of monomers selected from the ethylene-based cyclic hydrocarbon monomer and the cyclopentadiene-20-200819874 monomer can be (5) A saturated copolymer of a specific monomer and a compound containing an unsaturated double bond is obtained by the same addition polymerization method. Further, the hydrogenated (co)polymer of the above-mentioned addition (co)polymer can be obtained by the same hydrogenation method as the hydrogenation (co)polymer of the above (3) ring-opening (co)polymer. . Further, as the cyclic olefin resin, (7) an alternating copolymer of the above specific monomer and acrylate may be used. <Acrylate> The acrylate used in the production of the above-mentioned alternating copolymer of the specific monomer and the acrylate may, for example, be methyl acrylate, 2-ethylhexyl acrylate or hexacyclohexane. a heterocyclic group having 2 to 20 carbon atoms, such as a linear, branched or cyclic acrylic acid ester having a carbon number of 1 to 20, such as an ester, such as glycidyl acrylate or 2-tetrahydrofurfuryl acrylate. Acrylic acid having a polycyclic structure, such as an acrylate, an acrylic acid acrylate or the like, having an aromatic ring group-containing acrylate having 6 to 20 carbon atoms, an isobornyl acrylate or a dicyclopentanyl acrylate having a carbon number of 7 to 3 Å. ester. In the present invention, in order to obtain (7) the above-mentioned specific monomer and acrylate alternating copolymer 'in the presence of Lewis acid, when the total of the above specific monomer and acrylate is 100 moles, usually the above specific The monomer is 30 to 70 moles, and the acrylate is 70 to 30 moles, preferably 40 to 60 moles of the above specific monomer, and 60 to 40 moles of the acrylate, particularly preferably the above specific The monomer is 45 to 55 moles, and the acrylate is 55 to 4 5 Mo-21 - 200819874 The ratio of the ears is subjected to radical polymerization. The amount of the Lewis acid used to obtain (7) the above-mentioned alternating copolymer of the specific monomer and the acrylate is 0.001 to 1 mol per 1 mol of the acrylic acid. Further, a well-known free radical-generating organic peroxide or an azobis-based radical polymerization initiator can be used, and the polymerization temperature is usually -20. (: ~ 80 ° C, preferably 5 ° c ~ 6 (TC. Further, in the solvent for polymerization, the same solvent as used in the ring-opening polymerization reaction can be used. Further, the present invention "Copolymer" means that the structural unit derived from the above specific monomer is not adjacent, that is, a copolymer having a structural unit of a specific unit derived from the above specific monomer, which is necessarily a structural unit derived from an acrylate, and The structure in which the structural units derived from the acrylate are adjacent to each other is negated. The preferred molecular weight of the cyclic storage resin used in the present invention is intrinsic viscosity [η] ίηΐι 〇 2~5 dl/g, more preferably Suitable for polystyrene-equivalent number average molecular weight (Μη), as determined by gel permeation chromatography (GPC), in a solution of 0.3 to 3 dl/g, particularly preferably 0.4 to 1.5 dl/g, dissolved in tetrahydrofuran. It is 8,000 to 100,000, more preferably 10,000 to 80,000, particularly preferably 1 to 2,000 to 50,000, and the weight average molecular weight (1^^¥) is 20,000 to 300,000, more preferably 3,000 to 250,000, and particularly preferably 40,000 to 200,000. 〇 By making the intrinsic viscosity [η] inh, the number is flat When the average molecular weight and the weight average molecular weight are within the above range, the heat resistance, water resistance, chemical resistance, mechanical properties of the cyclic olefin resin, and the moldability of the optical film of the present invention -22-200819874 become good. The glass transition temperature (Tg) of the cyclic olefin resin used in the present invention is usually 110 ° C or more, preferably 110 to 35 (TC, more preferably 120 to 2 50 ° C, particularly preferably 120 to 200 ° C. When the Tg is lower than 1 10 ° C, it is not suitable for use under high temperature conditions or secondary processing such as coating, printing, etc. On the other hand, if the Tg exceeds 3 50 ° C, it is formed. The processing becomes difficult, and the possibility of deterioration of the resin is high due to the heat during the forming process. In the above cyclic olefin-based resin, for example, it is possible to blend, for example, an unopening 9 in a range that does not impair the effects of the present invention. The specific hydrocarbon resin described in Japanese Laid-Open Patent Publication No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. Used In the cyclic olefin-based resin, an additive such as a well-known antioxidant or ultraviolet absorber for improving thermal degradation resistance or light resistance can be added to the extent that the effect of the present invention is not impaired. For example, for a ring of 100 parts by weight In the olefin-based resin, at least one compound selected from the group consisting of a phenol compound, a thiol compound, a sulfur compound, a disulfide compound, and a phosphorus compound is added in an amount of 0.001 to 1 part by weight. It can improve the thermal degradation resistance. Further, when the cyclic olefin-based resin of the present invention is formed by melt extrusion to form a film or the like, an antioxidant may be added in order to prevent thermal degradation of the resin by heat transfer during melt extrusion. As the antioxidant, when the film obtained by melt extrusion is subjected to drawing processing, it is preferred to use a hindered phenol-based compound having a melting property so as not to lower the expression of the phase difference or to minimize the degree of reduction. 23-200819874 The temperature is in the range of -30 ° C to Tg + 130 ° C of the glass transition temperature (1 ^) of the melt-extruded cyclic olefin resin, preferably Tg - 25 ° C to Tg + 13 (TC temperature range. <Production Method of Optical Film> As a method for producing the optical film of the present invention, a melt extrusion method in which a cyclic olefin-based resin is melted, extruded from a die, and pressed against a cooling roll to form a film can be used. As a method of melting the cyclic hydrocarbon-based resin, it is preferred to melt the resin by an extruder, and the molten resin is quantitatively supplied by a gear pump, and filtered by a metal filter or the like to remove impurities. A method of extruding while the die is imparted to the shape of the film is preferred. The method of cooling and flaking the film extruded from the die may be a nip roll method, an electrostatic application method, an air knife method, a rolling method, a single-sided tape method, a double-sided tape method, or a three-roller method. Wait. In order to produce a sheet having less optical distortion, it is preferable to use a single-sided tape type, in particular, a sleeve type sheet manufacturing apparatus, an electrostatic application method, or the like. For example, a first cooling roll is disposed below the discharge port of the die, and a second cooling roll adjacent to the first cooling roll is disposed, and a third cooling roll adjacent to the second cooling roll is disposed as needed, and the first cooling roll is disposed A third (or second) cooling roll parallel peeling roll film manufacturing apparatus, or a film forming apparatus in which a cooling roll and a cooling belt are disposed, and a peeling roll in parallel with the cooling roll is disposed. Further, the cooling belt is held in a state of tension by two holding rolls provided in contact with the inner surface thereof. The resin discharged from the discharge port is sandwiched between the first cooling roller and the second cooling roller, between -24 and 200819874, or between the cooling roller and the cooling belt, and transferred to the (first) cooling roller. After cooling, it was peeled off by a peeling roll and thinned. Further, at the both ends of the film to be discharged, the cooling roller below the discharge port of the die is attached to the cooling roll side by using the oppositely disposed charging electrode, and the surface of the film is used without causing optical distortion. The method of improving the transfer state can be carried out by using a pressure roller, a method of attaching a resin to a cooling roll by using an ear height portion at both end portions in the film width direction, and the like. As the extruder, any one of a single shaft, a two shaft, a planetary type, a kneader, and the like can be used, but a single shaft extruder is preferred. Further, the shape of the screw of the extruder includes a large compression ratio such as a vent type, a semi-spiral type, a front end with a squeegee type, and a full spiral type, a small one, and a compression portion having a long length and a short compression length. If the oxygen is mixed in, the shear heat inside the extruder is likely to cause gelation in the resin. Since the gel is a cause of a spot-like defect or a focal spot called a fisheye in a film, it is preferably a spiral shape/compression type capable of suppressing dissolution of oxygen and suppressing shear heat generation, and a preferred compression ratio is 1 · 5 ~ 4 · 5, especially good 1. 8 ~ 3.6. The gear pump used for the metering of the resin may use either an internal lubrication type or an external lubrication type, and an external lubrication method is preferred. The filter used for the filtration of the foreign matter may be a leaf disc type, a candle type, a leaf type, a screen or the like. In order to reduce the residence time distribution of the resin, the optimum size is the leaf disc type, which means that the nominal sieve opening of the sieve of the filter is 20 μηι or less, preferably ι〇μηι or less, more preferably 5 μιη or less, and most preferably 3μπι or less. If the nominal mesh size is larger than 2 〇μπι, removal of the foreign matter 'gel or the like seen by the eye is difficult, and it is not suitable as a filter for producing an optical film of -25-200819874. As the die, the resin flow inside the die must be made uniform, and in order to maintain the uniformity of the thickness of the film, the pressure distribution inside the die near the exit of the die must be constant in the width direction. As such a condition, a multi-manifold die, a fishtail die, a coat hanger die or the like can be used, and among them, a coat hanger die is preferable. Further, in order to adjust the flow rate of the die, it is preferably a curved lip shape. In addition, it is a model for the function of thickness adjustment with automatic control of the hot plug method. A choke rod for flow adjustment is installed, or a lip block for thickness adjustment is installed. Since a height difference occurs in the mounting portion, air is trapped in the gap of the mounting portion, etc., which causes a focal spot to become a port. The reason for the pattern stripe is not suitable. The discharge port of the die is preferably covered with a super hard paint such as tungsten carbide. In addition, as the material of the die, SCM-based steel, stainless steel such as SUS, and the like are exemplified, but are not limited thereto. In addition, it is possible to form a film having a film such as TiN, TiAIN, TiC, CrN, or DLC (diamond-like carbon) by a PVD (physical vapor deposition) method or the like using a plating material having a surface, such as nickel, titanium, or the like. There are other ceramics, the surface is treated by nitriding. Since such a die has a high surface hardness and a small friction with the resin, it can prevent the incorporation of scorched garbage and the like in the obtained transparent resin film, and at the same time, prevent the occurrence of die streaks, and from these points, More suitable. The cooling roll preferably has a heating means and a cooling means inside, and as the cooling roll, it is preferably a surface-based ceramic, chrome, electroless nickel or the like, and is particularly preferable to the first contact of the resin discharged from the die. The surface of the chill roll is ceramic. As the cooling roll whose surface is ceramic, a sprayer which applies the ceramic -26-200819874 porcelain to the metal roll can be mentioned. Examples of the material of the ceramic include alumina, tungsten carbide, titanium nitride, and TiCN. However, from the viewpoint of surface hardness and strength, alumina is preferred. The surface roughness is expressed as 1.0 μηι or less in terms of maximum roughness Rs, and particularly preferably 0.5 μmη or less. Examples of the surface coating method of the ceramic include a method of spraying, sputtering, PVD, CVD, and the like. A spray coating method which can coat a large area uniformly is a preferred coating method. Further, the cooling roll having a surface of chromium or electroless nickel is preferably a metal roll which is provided with chrome plating, electroless nickel plating or the like. As the cooling belt used for the single-sided belt type device or the sleeve type traction device, it is preferable to use a jointless endless belt. As a material constituting the cooling belt, a metal such as stainless steel or nickel can be used. Further, the holding roller for holding the cooling belt preferably has a surface covered with a polyoxynized rubber or other heat-resistant elastic body or the like. The thickness of the cooling belt is preferably 0.1 to 0.4 mm. If it is less than 0 · 1 mm, the belt having a large bending is likely to be damaged, so it is not suitable. On the other hand, 'Right than 〇. 4 m m thick thickness' can not follow the film deformation during processing, so it is not suitable. The film is produced by the above apparatus, for example, in accordance with the following. In general, before the cyclic olefin resin is introduced into the extruder, the resin is dried at an appropriate temperature equal to or lower than the Tg of the resin in order to remove moisture, gas (oxygen, etc.), residual solvent, and the like contained in the resin in advance. The dryer used for drying is preferably an inert gas circulation dryer or a vacuum dryer. Further, in order to suppress moisture absorption or oxygen absorption in the hopper, it is also preferable to use a inert gas such as nitrogen gas or argon gas to seal the hopper or to maintain the vacuum hopper in a reduced pressure state. -27- 200819874 The extruder barrel is preferably sealed with an inert gas such as nitrogen or argon in order to prevent the resin from being oxidized during melt extrusion to produce a gel or the like. The cyclic olefin-based resin melted by the extruder is extruded into a sheet shape from the die discharge port in the vertical direction downward. The temperature distribution at the outlet of the die is preferably controlled to be ± 1 ° C or less in order to reduce the difference in melt viscosity of the resin. Then, the extruded resin is pressed and cooled by the first cooling roll and the second cooling roll or the cooling belt. Further, the resin transferred onto the surface of the cooling roll is peeled off from the surface of the first roll by the peeling roller, passes through the upper portion of the second cooling roll, and is cooled by the third cooling roll. In the present invention, the draw down ratio h represented by the following formula is 6.5 or more, preferably 7.0 or more, more preferably 7.0 to 16.0. Since the draw down ratio h is 6.5 or more, the obtained optical film has a wide range of optical axes within ±5° in the longitudinal direction of the film. Draw down ratio h = film thickness at the time of exiting from the die exit / film thickness of the obtained film, the film thickness at the time of extrusion from the die exit, that is, the lip corresponding to the exit of the die Opening. The processing temperature of the resin, that is, the set temperature of the extruder and the die, is preferably a resin Tg+100 from the viewpoint that the resin in a molten state in which the fluidity is uniform can be discharged from the die and the deterioration of the resin can be suppressed. Above °C, Tg + 2 0 0 °C or less. Further, the distance from the discharge of the resin from the die discharge port to the contact with the cooling roll is preferably such that the film thickness unevenness of the obtained film is suppressed as it is shorter. The distance is preferably 100 mm or less, more preferably 80 mm to -28-200819874. Here, the surface temperature of the first cooling roll is preferably Tg ± 5 ° C of the resin, more preferably Tg - 5 to Tg + 2 ° C. When the surface of the first cooling roll is at the above temperature, the effect of arranging the optical axes of the film in the longitudinal direction can be obtained. The speed ratio v1 (v2/vl) of the peripheral speed v1 of the first cooling roll to the peripheral speed v2 of the second cooling roll or the cooling belt is preferably 1.01 to 1.06, particularly preferably 1.03 to 1.05. When the value of vs is within the above range, the optical axis of the obtained optical film tends to coincide with the longitudinal direction of the film. Further, the peripheral speed v1 is preferably 5 to 30 m/min, more preferably 7 to 20 m/min. Further, as the conditions at the time of film peeling, when the peeling temperature is taken as Tt (° C.) and the peeling stress is taken as TF (MPa), it is preferable that each is in the range of § -30 ° C STtSTg + 5 〇 C, 〇. 〇lMPa$TF$5MPa range. In the optical film of the present invention, when the optical axis is measured in the entire width direction of the film, the optical axis is within 80% or more, preferably 90% or more of the total width of the film in the range of ±5° in the longitudinal direction of the film. When the optical axis of the optical film is aligned in the longitudinal direction, when the optical film is stretched to obtain a retardation film, a retardation film having no optical axis fluctuation can be obtained. The dimensional shrinkage factor by heating of the optical film of the present invention is usually 5% or less, preferably 3% or less, more preferably 1% or less, when it is heated at 100 ° C for 500 hours. Good is 0.5% or less. The total light transmittance of the optical film of the present invention is preferably 90% or more, and particularly preferably 95% or more. Further, the optical film of the present invention has a particularly remarkable effect in a wide film having a width of lm or more. -29- 200819874 <<Retardationfilm>> The retardation film of the present invention is obtained by further stretching the optical film of the present invention. Specific examples of the stretching processing method in this case include a well-known one-axis stretching method or a biaxial stretching method. That is, a transverse one-axis stretching method using a tenter method, a roll-to-roll compression stretching method, a longitudinal one-axis stretching method using two sets of rolls having different circumferences, or a two-axis stretching in which a horizontal axis and a vertical axis are combined can be used. Method, stretching method of inflation method, and the like. In the case of the one-axis stretching method, the stretching speed is usually from 1 to 5,000%/min, preferably from 50 to 1,000%/min, more preferably from 1 to 〇〇〇, 〇〇〇%/min, particularly preferably 1 00~500%/min. In the case of the biaxial stretching method, the stretching may be carried out in two directions at the same time, or the stretching treatment may be performed in a direction different from the initial stretching direction after the one-axis stretching. In this case, the angle of intersection of the two stretching axes for controlling the shape of the refractive index ellipsoid of the stretched film is determined according to the desired characteristics, and is not particularly limited, and is usually in the range of 120 to 60. The range of degrees. Further, the stretching speed may be the same or different in each stretching direction, and is usually from 1 to 5,000%/min, preferably from 50 to 1,000%/min, more preferably from 100 to 1,000%/min. Very good for 1〇〇~500%/min. The stretching processing temperature is not particularly limited, but is usually Tg ± 30 ° C, preferably Tg ± 15 ° C, more preferably Tg - 5 ° C, based on the glass transition temperature Tg of the resin of the present invention. Tg + 15 ° C range. In the above range, it is possible to suppress the occurrence of phase difference unevenness' and the control of the refractive index ellipsoid is easy, so that it is preferable. Since the stretching ratio is determined according to the desired characteristics, it is not particularly limited by 30-200819874, and is usually from 1.01 to 10 times, preferably from 1 to 3 to 5 times, more preferably from 1.03 to 3 times. When the draw ratio is 10 times or more, the control of the phase difference becomes difficult. The stretched film can be cooled as it is, at a temperature of Tg-2 (TC~Tg for at least 10 seconds, preferably 30 seconds to 60 minutes), preferably 1 minute to 60 minutes, kept hot. Preferably, it is preferable to obtain a stable retardation film having a small change in the phase difference of transmitted light with time. The retardation film of the present invention has a thickness of 3 mm as measured according to ASTM D 1 003. The degree of the lanthanum is 1% or less, preferably 8% or less. Further, the average roughness Ra of the film is preferably 0.2 μm or less, more preferably 0.15 μm or less, and particularly preferably 0.1 μm or less. The dimensional shrinkage ratio by heating of the retardation film is usually 10% or less, preferably 5% or less, more preferably 3% or less, and particularly preferably 1 when heated at 100 ° C for 500 hours. The optical film of the present invention is oriented by stretching to impart a phase difference in transmitted light, which can be controlled by stretching ratio, stretching temperature, thickness of a film, etc. For example, When the thickness of the film before stretching is the same, the film having a larger stretching ratio has a phase difference of transmitted light. Since the tendency to 値 is increased, a retardation film which imparts a desired phase difference to the transmitted light can be obtained by changing the stretching ratio. On the other hand, when the stretching ratio is the same, the film before stretching is used. The thicker the thickness, the greater the absolute difference in the phase difference of the transmitted light. Therefore, by changing the thickness of the film before stretching, a retardation film which imparts a desired phase difference to the transmitted light can be obtained. In the stretching processing temperature range, the lower the stretching temperature, the greater the tendency of the transmitted light phase -31 - 200819874, so that by changing the stretching temperature, the desired phase difference can be given. The retardation film of the transmitted light has a thickness of the retardation film obtained by stretching as described above, and is usually ΙΟΟμηι or less, preferably 100 to 20 μm, more preferably 80 to 20 μm. By thinning the thickness, the thickness can be greatly reduced. Responsive to the miniaturization and thinning required for products using the phase difference film. Here, in order to control the thickness of the retardation film, the thickness of the optical film before stretching can be controlled, or the stretching ratio can be controlled. Be accomplished, for example, by means of thin optical film before stretching, stretching ratio, or becomes relatively large, it can be more reduced thickness of the retardation film. <<PolarizingPlate>> The polarizing plate of the present invention can use a water-based adhesive composed of an aqueous solution mainly composed of PVA resin on at least one surface of a polarizing plate composed of a PVA-based film or the like. The polar group-containing adhesive is bonded to the optical film and/or the retardation film of the present invention, and is heated or exposed or pressed as necessary to adhere (lamination) the polarizer to the optical film. <<Liquid Crystal Panel> The liquid crystal panel of the present invention can be bonded to at least one surface of a liquid crystal display element in which liquid crystal is sandwiched between two glass substrates, and the liquid crystal display element can be bonded to the liquid crystal display element. The polarizing plate is bonded (laminated) to be manufactured. [Embodiment] -32-200819874 Specific embodiments of the present invention are described below, but the present invention is not limited by the embodiments. In addition, "%" and "%" in the following terms mean "parts by weight" and "% by weight" unless otherwise specified. Further, in the following examples, various evaluations were carried out by the following methods. [Glass transfer temperature (Tg)] The glass transition temperature [total light transmittance, fog" was measured under a nitrogen atmosphere at a temperature increase rate of 20 ° C / min using a differential scanning calorimeter (DSC) manufactured by Seiko Instruments Inc. Degree] The haze meter HM-150 model manufactured by Murakami Color Technology was used to measure the total light transmittance and haze. [In-plane phase difference (R0) and optical axis of the transmitted light] Using the "KOBRA-21ADH" manufactured by Oji Scientific Instruments Co., Ltd., the in-plane phase difference (R0) when the light is perpendicularly incident on the film is measured at a wavelength of 550 nm. The optical axis was measured by taking the temperature toward the downstream in the longitudinal direction of the film. The optical axis of the ±90 degree direction becomes the width direction (TD direction) of the film. [Transmittance and Polarization of Polarizing Plate] The transmittance and polarization of the polarizing plate were measured using "RETS" manufactured by Otsuka Electronics Co., Ltd. The wavelength was measured at 5 5 iim. -33- 200819874 [Thin film thickness distribution] Measured in the film length direction using a film thickness distribution measuring device (MOCON). Example 1 As a resin, a cyclic olefin resin (manufactured by JSR Corporation: "ARTON D45 3 1", glass transition temperature: 1 30 ° C) was used, and a nitrogen circulation type dryer (manufactured by Sekisui Co., Ltd.: The model NS-200) was conveyed and dehumidified and dried at a drying temperature of 10 ° C for 180 minutes under a nitrogen atmosphere. Then, it was guided to an extruder (GM-90, manufactured by GM Engineering Co., Ltd.), melted at 260 ° C, used a gear pump to supply liquid, and a 5 μηι leaf disc filter was used to remove foreign matter by setting at 25 °. The aluminum cast heater of C was extruded from a T die (width 1 600 mm) having an opening width of 26085 mm which was heated to 260 °C. The distance between the exit of the T die and the film pressing point of the first cooling roll was 65 mm, and the extruded resin was pressed against the first cooling roll. The first cooling roll was 250 mm φ, and the surface of the roll was sprayed with a 45 μm thick film of alumina with a surface roughness of 0.1 s. The surface temperature of the first chill roll is heated to 135 ° C and used to confirm the temperature with a surface thermometer. The film is pressed at a film surface temperature of 13 ° C to draw the film pressed on the first chill roll. The drawn film was pressed as it is to the surface temperature of 1 2 8 . (The second cooling roller is pressed against the third cooling roller having a surface temperature of 1 23 ° C and the fourth cooling roller having a surface temperature of 1 15 t, and the surface temperature of the film is l 〇 9 ° C. In the state, the film was peeled off under a tension of 6 kgf to obtain a film having a width of -34 to 200819874 1 5 3 4 mm. Both ends of the obtained film were cut by a slitter to obtain a film having a width of 1 400 mm. Further, a cooling roll Both are 25 0mm φ, and the surface of the first and second cooling light rolls is sprayed with a 4 5 μm thick oxidized crystal film. In addition, the circumferential speed of each cooling roller is 7.60 m/min and 7.80 m in this order. /min, 7.76 m/min, 7.73 m/min. The obtained optical film (hereinafter also referred to as "film 1") has a film thickness of 100 μm and a draw down ratio h of 8.5. It is confirmed that the optical axis of the obtained film 1 is -5 to 7 degrees in the flow direction (the longitudinal direction of the film), and the optical axis is in the range of ±5° in the longitudinal direction, which is 85% for the full width of the film. Further, the haze value of the film was measured, and as a result, the haze 値 was 0.2%. Example 2 In the above Example 1, a ring was used. An olefin resin (manufactured by JSR Corporation: "ARTON D45 3 2", glass transition temperature: 146 ° C). When the film is transferred onto a roll, a pressure roller having a diameter of ηιηπιφ is used to press the film at both ends. The surface temperature of the press roll was set to 1 2 2 ° C. Other manufacturing conditions were obtained by the same method as in Example '1, and a film having a width of 1 545 mm was obtained. The obtained film was cut by a slitter. At both ends, a film having a width of 1 3 50 mm (hereinafter also referred to as "film 2") is confirmed. The optical axis of the film 2 is confirmed, and as a result, the pressure roller is 80 to 90 degrees, and the optical axis of the inner side of the pressure roller is In addition, the absolute enthalpy is 3 degrees or less. The optical axis is 80% in the range of ±5° in the longitudinal direction, and the haze 薄膜 of the film 2 is 0.3%. -35- 200819874 Comparative Example 1 The same apparatus as that of the above-mentioned Example 1 was used, and the interval of the exit of the T-die used for the extrusion of the resin was 〇. 4 5 mm. Other conditions were the same as in Example 1. , to obtain a film with a width of 1 5 50 mm. Cut the obtained thin film with a slitter Both ends are formed into a film having a width of 1420 mm (hereinafter also referred to as "film 3"). The optical axis of the film 3 is 75 to 90 degrees in the width direction, and the optical axis is in the range of 5 ° in the length direction. In other words, the haze 値 of the film 3 was 0.3%. Comparative Example 2 Using the same material as in the above embodiment, the temperature of the first cooling roll was set to 125 degrees by the same apparatus. The surface temperature of the second cooling roll was set to 120 ° C. The surface temperature of the second cooling roll was set to 117 ° C, and the surface temperature of the fourth cooling roll was set to 1 1 2 ° C. Other conditions were given by the examples. 1 In the same manner, a film having a width of 1 540 mm was obtained. Both ends of the obtained film were cut by a slitter to form a film having a width of 14 1 10 m (hereinafter also referred to as "film 4"). The optical axis of the obtained film 4 was ±75 to 90 degrees in the full width. Further, at the time of peeling of the film, the film was damaged by the occurrence of slip on the first peeling roll, and the haze 薄膜 of the film 4 was 0.8%. Comparative Example 3 A roll using the same temperature conditions as in the above Example 1 'First Cooling• 36-200819874 The peripheral speed of the roll was 7.60 m/min, and the peripheral speed of the second cooling roll was 7.57 m/min, the third cooling roll The peripheral speed was 7.52 m/min, and the peripheral speed of the fourth cooling roll was 7.4 8 m/min, resulting in a film having a width of 1 540 mm. Both ends of the obtained film were cut by a slitter to obtain a film having a width of 1410 mm (hereinafter also referred to as "film 5"). The optical axis of the film 5 is ±75 to 90 degrees in the full width. Haze 0.3 is 0.3%. Preparation Example 1 The weight average molecular weight (Mw) consisting of 94.8 parts of butyl acrylate, 5 parts of acrylic acid, and 0.2 part of 2-hydroxyethyl methacrylate has a weight average molecular weight (Mw) of 1.2 million, a weight average molecular weight and To the ethyl acetate solution of the acrylic polymer having a ratio of the number average molecular weight (Μη) of 3.9 (Mw/Mn), toluene was added to dilute to a 13% toluene solution of the above acrylic polymer, and 2.0 parts of isocyanate was added to crosslink. Agent [Coronet L (manufactured by Nippon Polyurethane Co., Ltd.)] and stirred to form a solution, which is applied to the release film by means of 60 ° C x 5 minutes, 100 ° C x 5 without foaming After the two stages of the minute were dried, the light release type release film was laminated and fixed on the adhesive surface to prepare an unsupported film having a thickness (average enthalpy) of 25 μm after drying. Example 3 Using the film 1' obtained in Example 1, the film was stretched 1.2 times at a temperature of 130 °C using a roll-clamp type vertical-axis stretching machine to obtain a retardation film 1 having a width of 1,180 mm and a thickness of 90 μm. -37- 200819874 In terms of the phase difference of the retardation film 1, the phase difference (R0) in the film plane is 60 nm, and the optical axis is -1 to +1 in the full width. . Further, the retardation film 1 had a total light transmittance of 93% and a haze of 0.2%. Example 4 A film having a width of 1 150 mm and a thickness of 90 μm was obtained in the same manner as in Example 3 except that the film 2 was used instead of the film 1 and the stretching temperature was changed to 15 5 °C. Poor film 2. With respect to the phase difference of the retardation film 2, the phase difference (R0) in the plane of the film was 63 nm. Further, the retardation film 2 had a total light transmittance of 93% and a haze of 0.2%. Comparative Example 3 A retardation film 3 having a width of 1 200 mm and a thickness of 90 μm was obtained in the same manner as in Example 3 except that the film 3 was used. With respect to the phase difference of the retardation film 3, the phase difference (R0) in the film plane was 63 nm, and the optical axis was -1 to +1 ° in the 93% of the full width, but the optical axis exceeded ±1. The range occurred 7%. Further, the retardation film 3 had a total light transmittance of 93% and a haze of 1.5%, and fogging occurred on the surface of the film. Comparative Example 4 A retardation film 4 having a width of 1 1 90 mm and a thickness of 90 μm was obtained in the same manner as in Example 3 except that the film 4 was used. With respect to the phase difference of the retardation film 4, the phase difference (R0) in the film plane was 64 mm, and the optical axis was -1 to +1 in the full width of 95%. , but the optical axis exceeds ± 1. The range occurs from 5% to 38-200819874. Further, the retardation film 4 had a total light transmittance of 93% and a haze of 1.7%, and fogging occurred on the surface of the film. Example 5 A polyvinyl alcohol film having a thickness of 50 μm was immersed in a 40 ° C bath composed of 5 g of iodine, 250 g of potassium iodide, 10 g of boric acid, and 1 g of water, and a shaft was made for about 5 minutes. The film was stretched to 4 times to obtain a polarizing film. The film 1 produced in Example 1 and the stretched film 1 produced in Example 3 were adhered to the polarizing film on each surface of the polarizing film using the water-based adhesive obtained in the first modification to obtain a polarizing plate. (1 ). The transmittance and the degree of polarization of the polarizing plate (1) were measured and found to be 43% and 99.99%, respectively. Further, when the polarizing plate (1) was placed in a crossed Nicols state, and one of the polarizing plates (1) was irradiated with a backlight having a luminance of 1 0 00 Ocd, the other side was observed, and it was confirmed that there was no rib-like shape due to light leakage. All. Comparative Example 5 A polarizing plate (2) was obtained in the same manner as in Example 5 except that the film 3 was used instead of the film 1, and the stretched film 3 was used instead of the stretched film 1. The transmittance and the degree of polarization of the polarizing plate were measured and found to be 42% and 99.89%, respectively. Further, when the polarizing plate (2) was placed in a crossed Nicols state, and one of the polarizing plates (2) was irradiated with a backlight having a luminance of 100 cd, and when viewed from the other side, light leakage due to light diffusion was confirmed. Industrial Applicability-39-200819874 The optical film and polarizing plate of the present invention can be used for display of examples, digital information terminals, pocket pagers, navigators, vehicles, liquid crystal monitors, dimming panels, and 〇A machines; Various liquid crystal display elements such as displays, electroluminescent panels, and the like. Further, it is also applicable to a wavelength plate used in a recording/reproducing device for CDs, CD-Rs, and MDs, such as a liquid crystal display for a portable telephone, an AV device, or a touch MO, DVD, etc. -40-

Claims (1)

200819874 X. Patent Application No. 1. An optical film characterized in that a film made of a cyclic olefin resin has an optical axis of ±5 in the longitudinal direction of the film when the optical axis is measured in the entire width direction of the film. The range within the film is an optical film of 80% or more of the full width of the film. 2. The method for producing an optical film according to the first aspect of the invention, wherein the cyclic olefin resin is melted, extruded from a die, and pressed against a cooling roll to form a film, the following formula The draw down ratio h is expressed by 6.5 or more, and the draw down ratio h = the film thickness at the time of extrusion from the die exit / the film thickness of the obtained film. 3. The method for producing an optical film according to claim 2, wherein the surface temperature of the resin extruded from the die at the first chill roll which is initially pressed is at a glass transition temperature (Tg) of the resin ± 5 Within the range of °C. 4. The method of producing an optical film according to the second to third aspect of the invention, wherein a peripheral speed v1 of the first cooling roller and a peripheral speed v2 of the second cooling roller or the cooling belt disposed adjacent to the first cooling roller are at a speed The ratio vs (v2/vl) is in the range of 1.01 to 1.06. 5. The method of producing an optical film according to claim 2, wherein the surface of the first cooling roll is ceramic. A retardation film formed by further stretching an optical film of the first aspect of the patent application. A polarizing plate characterized by laminating an optical film as in the first aspect of the patent application on at least one side of the polarizer or a retardation film as in the sixth aspect of the patent application-41-200819874. A liquid crystal panel characterized by laminating a polarizing plate of item 7 of the patent application scope on at least one side of a liquid crystal display element. -42- 200819874 VII. Designated representative map (1) The designated representative figure of this case is: None (2), the representative symbol of the representative figure is a simple description: 8. If there is a chemical formula in this case, please reveal the best indication of the characteristics of the invention. Chemical formula: