TW200804063A - Method for manufacturing optical film, optical film, and method for manufacturing oriented film - Google Patents

Abstract

The invention provides a method for manufacturing a long cyclic olefin optical film with any phase difference and a small optical fluctuation with ease, an optical film useful as a material for an oriented film and a method for manufacturing an oriented film using the optical film. In a manufacturing process for the optical film, a molten cyclic olefin resin is extruded from a die and is press-stuck on a substrate to make a film, and the film is released from the substrate to take it up into a rolled shape, or alternatively the cyclic olefin resin is dissolved or dispersed in an organic solvent and is cast on a substrate, a part of the organic solvent is removed to form a film-like composition, and the film-like composition is released from the substrate and furthermore, the organic solvent is removed to take it up into a rolled shape. The method for manufacturing the optical film is characterized in that when the film is released from the substrate, the film is released at a temperature of Tg of the cyclic olefin resin–30 DEG C to Tg+20 DEG C by 1-30 kgf/cm2.

Description

200804063 (1) EMBODIMENT OF THE INVENTION [Technical Field] The present invention relates to a method for producing an optical film which can obtain an optical film having an arbitrary phase difference by a simple method, and a raw material film suitable as an extended film A method of manufacturing an optical film and an extended film using the optical film. g [Prior Art] The cyclic olefin resin is suitable for use in optical films because of its excellent transparency, heat resistance, moisture resistance and the like. In general, a film made of a cyclic olefin resin is produced by a solution casting method (solution casting method), a melt extrusion method, or the like, and is stretched as necessary. The optical film is required to have excellent optical properties such as transparency, and the film must be uniform and have less optical ripple. Optical wavy generated when an optical film is produced, such as phase difference ripple generated during stretching. As a method of extending the phase Φ difference corrugation, for example, a method of adjusting the clamp interval and temperature conditions in the tenter stretching method, a method of manufacturing a film having less optical corrugation can be manufactured by a simpler method. [Patent Document 1] Japanese Laid-Open Patent Publication No. 2005-2548 No. 2 No. 2 Publication No. [Problems to be Solved] The present invention is produced by a simple method with an arbitrary phase difference and small optical ripple (MURA). The method of the long cyclic olefin type optical film, and 200804063 (2) The optical film which is suitable as the raw material film of the extension film, and the manufacturing method of the extension film using this optical film are the subject. [Means for Solving the Problem] The method for producing an optical film of the present invention (hereinafter also referred to as "manufacturer's method 1") is characterized in that a molten cyclic olefin resin is extruded from a die and pressed against a base. a step of producing a film which is peeled off from the substrate and which is taken up into a roll Φ shape, and which has a step of removing the film from the substrate to a roll shape, and has a cyclic olefin in any step The step of applying a stress of 1 to 30 kgf/cm 2 at a temperature of Tg-30 ° C to Tg + 20 ° C of the resin. (Also, Tg represents the glass transition temperature, and the same applies hereinafter). In the production method 1, when the film is peeled off from the substrate, a stress of 1 to 30 kgf/cm 2 is applied from the substrate at a temperature of Tg -30 ° C to Tg + 20 ° C of the cyclic olefin resin. ideal. The method for producing an optical film of the present invention (hereinafter also referred to as "manufacturing method φ method 2") is characterized in that a cyclic olefin resin is dissolved or dispersed in an organic solvent, and casted on a substrate to remove the organic solvent. Part of the film-like composition, the film-like composition is peeled off from the substrate, the organic solvent is removed, and the optical film is wound into a roll-shaped optical film, and the film-like composition is peeled off from the substrate to be wound into a roll-like shape. In any of the steps, there is a step of applying a stress of 1 to 30 kgf/cm 2 at a temperature of T g - 30 ° C to T g + 20 ° C of the film composition (however, The Tg of the film-like composition is the Tg measured by the DSC curve measured by the film-like composition at a temperature rise of 20 ° C / min. The same applies hereinafter. 200804063 (3) In the manufacturing method 2, when the film-like composition is peeled off from the substrate, the film-like composition exhibits a stress of 1 to 30 kgf/cm2 at a temperature of Tg-30t:~d @+20\: Peeling from the substrate is preferred. The optical film of the present invention is characterized in that it is composed of a cyclic olefin resin, and the refractive index in the direction of the maximum refractive index in the film plane at a light wavelength of 550 nm is nx, and is refraction in the film plane in the vertical direction of nx. When the ratio is ny and the film thickness is d [nm], the phase difference R0 (550) [nm] = (nx_ny) xd of the φ film is 20 nm or more and 300 nm or less, and the unevenness of R0 is within ±10%, and The maximum angle of the angle between the direction in which the maximum refractive index is displayed in the film plane and the direction of the length of the film is 〇° 10 10 °. The cyclic olefin-based resin is preferably a resin obtained by polymerizing or copolymerizing at least one compound represented by the following formula (1). [1] R1

(In the formula (1), R1 to R4 are a hydrogen atom, a halogen atom, a hydrocarbon group having 1 to 30 carbon atoms or other monovalent organic groups, which may be the same or different, and any two of Ri to R4 may mutually Bonded to form a single or polycyclic structure; m is 〇 or a positive integer, P is 0 or a positive integer). The method for producing an elongated film of the present invention is characterized in that the 200804063 (4) optical film of the present invention is stretched in the film width direction or the film length direction. The method for producing an elongated film of the present invention is characterized in that, as in the production method 1 or the production method 2, the obtained optical film is stretched in the film width direction. [Effects of the Invention] According to the present invention, a cyclic olefin-based optical film having an arbitrary phase difference φ and a small optical corrugation (MURA) can be produced by a simple method. Further, an optical film which is useful as a raw material film for an extended film having a small optical corrugation can be obtained. In the optical film and the stretched film of the present invention, since the thickness thereof is extremely small and the optical ripple is small, a liquid crystal display having a large screen or the like can be used, and high-performance without bending or corrugation can be achieved. And a method of producing an extended film using the optical film. [Embodiment] Hereinafter, the present invention will be specifically described. Cyclic olefin resin The optical film of the present invention is composed of a cyclic olefin resin. The cyclic olefin-based resin is a cyclic olefin compound having a fine skeletal skeleton represented by the above formula (1), which is used alone or in combination of two or more kinds, or a copolymerizable monomer other than the cyclic hydrocarbon-containing compound. As a polymerization or copolymerization monomer, it is also possible to use (co)polymerization for addition (co)polymer, ring-opening (co)polymer or ring-opening (co)polymerization followed by addition of hydrogen to the double bond in the main chain. Any one of -8- 200804063 (5). As the cyclic olefin resin constituting the optical film of the present invention, a (co)polymer obtained by using a monomer represented by the following formula (1) (hereinafter also referred to as "specific monomer") is preferred. Specifically, a polymer or a copolymer represented by the following (a) to (e) (hereinafter referred to as "(co)polymer η1 J ) ° U) a ring-opening polymer of a specific monomer can be suitably used (hereinafter Also known as "specific ring-opening poly-glycols") (b) specific monomers and cyclic monomers copolymerizable therewith (except for specific monomers, hereinafter also referred to as "co-polymerizable cyclic monomers") a ring-opening copolymer (hereinafter also referred to as "specific ring-opening copolymer") (a specific copolymer and a saturated copolymer of a compound containing an unsaturated double bond (hereinafter also referred to as "specific saturated copolymer") (d) a hydrogenated (co)polymer φ (e) of a specific ring-opening polymer or a specific ring-opening copolymer (hereinafter also referred to as "specific ring-opening (co)polymer)" to specifically open-ring (co)polymerize a hydrogenated (co)polymer obtained by hydrogenation after cyclization by a Friedel-Craft reaction, a hydrogenated (co)polymer of (d) or (e) High transparency, suitable for use, more ideally equivalent to (d) with the following • General formula (1 ') (Co) polymer of structural units represented by, in particular, desirably having a (co) polymer of structural units (2) represented by the following general formula [Chemical 2] 200 804 063

(In the formula (1), the definitions of R1 to R4, p, and m are the same as those in the above formula (1)). [化3]

(In the formula (2), the definitions of R1 to R4 are the same as those in the above formula (1)). [Specific monomer] As a preferred specific monomer, for example, in the above formula (1), ... and R3 are a hydrogen atom or a hydrocarbon group having a carbon number of 1 to 1 Å, and r4 is a hydrogen atom or a monovalent organic group, R2 And at least one of R4 represents a hydrogen atom and a polar group other than a hydrocarbon group, m is an integer of 0 to 3, P is an integer of 0 to 3, and 値 of m + p is 0 -10- 200804063 (7) 〜4, more The ideal is 〇~2, especially ideally 1. Further, the specific monomer having a polar group represented by the following formula (3) in the specific monomer has a high glass transition temperature (hereinafter also referred to as "Tg") and low hygroscopicity. The point of the cyclic olefin-based thermoplastic resin is suitable. -(CH2)nCOOR5 (3) (wherein R5 represents a hydrocarbon group having a carbon number of 1 to 12' η is an integer of 0 to 5). In the above formula (3), R5 is preferably an alkyl group. Further, the smaller the enthalpy of η, the higher the Tg of the obtained cyclic olefin-based thermoplastic resin, and more preferably η is a specific monomer of ruthenium, which is preferable because it is easily synthesized. Further, in the above formula (1), R1 and R3 are preferably an alkyl group, more preferably a fluorenyl group having 1 to 4 carbon atoms, more preferably a group having 1 to 2 carbon atoms, and particularly preferably a methyl group. Further, the carbon atom to which the alkyl group is bonded to the polar group represented by the above formula (3) is preferably bonded to the same carbon atom. Further, in the above formula (1), a specific monomer having m of 1 is preferable from the viewpoint of obtaining a thermoplastic resin composition having a higher Tg. Specific examples of the specific monomer represented by the above formula (1) include, for example, bicyclo [2·2·1]hept-2-ene, tricyclo[5·2·1·02'6]-8-nonene, Tetracycline [4.4·0·12,5·17,1()]-3-dodecene, pentacyclic [6·5·1.13,6.02,7·09,13]-4-pentadecene, five rings [7.4.0.12, 5.19, 12.〇8,13]-3-pentadecene, -11 - 200804063 (8) Tricyclo[4·4·0.12,5]-3-undecene, 5-methyl Bicyclo[2.2.1]hept-2-ene, 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, 9.5-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-propoxycarbonyl Tetracyclo[4.4.0.12, 5.17,1()]-3-dodecene, 8-isopropoxycarbonyltetracyclo[4.4.0. I2'5.]7'1 G]-3-dodecene , 8-n-butoxycarbonyltetracyclo[4.4.0.12'5·Γ'1()]-3-dodecene, 8-methyl-8-methoxycarbonyltetracyclo[4.4.0.12'5.17' 1()]-3-dodecene, 8-methyl-8-ethoxycarbonyltetracyclo[4.4.0.12'5"7,1 G]-3-dodecene, 8 -Methyl-8-n-propoxycarbonyltetracyclo[HO.] 2,5·;! 7,10]-]-decene, φ 8-methyl-8-isopropoxycarbonyltetracyclo [4.4 ··········· , ^ Dimethyl octahydronaphthalene, ethyl tetracyclododecene, 6 -ethylidene-2-tetracyclotetradecyl, trimethyl octahydronaphthalene, five rings [8.4.0.12'5.19'12.08'13] -3-hexadecene, -12-(9) (9) 200804063 Heptacyclo[8.7.0.13, 6.11(), 17.112, 15.02, 7.011'16]-4-hexadecene, heptacyclic ^^. "4,7"11,18"13,16^3,8^12,17]"-:^-ene, 5-ethylenebicyclo[2·2·1]hept-2-ene, 8 - Ethylene tetracyclo[4.4.0.1 2'5.17'1G]-3-dodecene, 5-phenylbicyclo[2·2·1]hept-2-ene, 8-phenyltetracyclo[4.4.0.12 ,5·17,1()]·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, 5.5-bis(trifluoromethyl)bicyclo[2·2·1]hept-2-ene, 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 - alkene, 5,5,6·tris(fluoromethyl)bicyclo[2.2.1]hept-2-ene, 5.5.6.6-tetrafluorobicyclo[2.2.1]hept-2-ene, 5.5.6.6- (Trifluoromethyl)bicyclo[2.2·1]hept-2-ene, 5,5-difluoro-6,6-bis(trifluoromethyl)bicyclo[2.2.1]hept-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]g -2-ene, 5- 5-5-pentafluoroethyl-6,6-bis(trifluoromethyl)bicyclo[2.2.1]hept-2-ene-13- 200804063 (10) 5,6-difluoro-5-heptafluoroisopropyl -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-ene , 5,5,6-trifluoro-6-heptafluoropropoxybicyclo[2·2·1]hept-2-ene, 8-fluorotetracyclo[4.4.0.12'5.17'1()]-3- Decadiene, 8-fluoromethyltetracyclo[4·4·0·12'5·17'1()]-3-dodecene, 8-difluoromethyltetracyclo[4 ·4·0.1 υ .Γ,1 G]· 3-dodecene, 8_trifluoromethyltetracyclo[4.4·0.12,5·17,1()]-3-dodecene, 8-pentafluoroethyltetracycline [4.4 · 0.1 2,5.1 7,1G]-3-dodecene, 8.8-difluorotetracyclo[4.4 ·0.1 2'5·:!7,1 °]-3-dodecene, 8.9-difluorotetracycline [4·4.0·12, 5.17,1()]·3-dodecene, 8.8-bis(trifluoromethyl)tetracyclo[4.4.0.12, 5.17,1()]-3-dodecene, 8 ,9-bis(trifluoromethyl)tetracyclo[4.4.0. I2,5"7,1 g]-3.dodecene, 8-methyl-8-trifluoromethyltetracyclo[4.4.0.12 , 5.17, 1()]-3-12 8.8.9-Trifluorotetracyclo[4.4.0.12,5.17,1()]-3-dodecene, 8,859-tris(trifluoromethyl)tetracyclo[4.4.0.12,5.17,1()]- 3-dodecene, 8.8.9.9-tetrafluorotetracyclo[4.4.0.12,5·l7,1G]-3-dodecene, 8,8,9,9-tetra(trifluoromethyl)tetracyclo[ 4·4.0· I2,5·!7,10]·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, -14- 200804063 (11) 8.8 .9-Trifluoro-9-trifluoromethyltetracyclo[4.4.0.12,5.l7,1G]-3-dodecene, 8.8.9-trifluoro-9-trifluoromethoxytetracyclo [4.4 .0.12,5.17,1()]-3-dodecene, 8.8.9-trifluoro-9-pentafluoropropoxytetracyclo[4·4·0·12,5.17,1ϋ]-3- + Alkene,

8-fluoro-8-pentafluoroethyl-9,9-bis(trifluoromethyl)tetracyclo[4·4.0·l2,5.Γ,1()]-3-dodecene, 8.9-difluoro -8-heptafluoroisopropyl-9-trifluoromethyltetracyclo[4.4.0.12,5.l7,1()]-3-dodecene, 8-chloro-8,9,9-trifluorotetra Ring [4_4.0.12, 5.17,1()]-3-dodecene, 8.9-dichloro-8,9-bis(trifluoromethyl)tetracyclo[4.4.0.12, 5.17,1()]-3 -dodecene, 8-(2,2,2-trifluoroethoxycarbonyl)tetracyclo[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-decadiene, and the like. Among these specific monomers, 8-methyl-8-methoxycarbonyltetracyclo[4.4.0.12, 5.17'1()]-3-dodecene, 8-ethylenetetracyclo[4.4.0.12, 5.17,1()]-3-dodecene, 8-ethyltetracyclo[mi2'5·;!7'1"-]-dodecene, pentacyclic [7.4.0.12'5.19'12.08'13] -3-pentadecene is preferred because it has a point of a cyclic olefin resin having excellent heat resistance. [Copolymerizable cyclic monomer] -15- 200804063 (12) The copolymerizable cyclic monomer of the cyclic copolymer is preferably a cyclic olefin having 4 to 20 carbon atoms, particularly 5 to 12 carbon atoms, and specific examples thereof include, for example, cyclobutene, cyclopentene, cycloheptene, and the like. Cyclooctene, tricyclo[5·2·1·02'6]-3-decene, 5-ethylidene-2-bornene, dicyclopentadiene, etc. [compounds containing unsaturated double bonds] φ As a compound containing an unsaturated double bond for obtaining a specific saturated copolymer, a polybutadiene, a polyisoprene, a styrene-butadiene copolymer, or an ethylene-nonconjugated diene may be used. An unsaturated hydrocarbon-based polymer having a carbon-carbon double bond in a main chain such as a polymer or a polybornene. The ratio of use to the copolymerizable cyclic monomer or the compound containing an unsaturated double bond is a specific monomer: a copolymerizable cyclic monomer or a compound containing an unsaturated double bond in a weight ratio of 100:0 to 5 0 : 5 0 is more desirable, more preferably 100: 0 to 60: 40. φ When the ratio of use of the copolymerizable cyclic monomer or the compound containing an unsaturated double bond is too high, the obtained copolymer When the Tg is low, the heat resistance of the resin is low, and it is difficult to obtain a film having high heat resistance. " [ Ring-opening polymerization catalyst] The ring-opening polymerization reaction of a specific monomer is carried out in the presence of a metathesis catalyst. It is selected from at least one metal compound (hereinafter referred to as "(a) component)) of a tungsten compound, a molybdenum compound, and a ruthenium compound, and a group 1 element (for example, Li, Na, K, etc.) and a group 2 from the periodic table. Elements (eg Mg, -16- 200804063 (13)

Ca, etc., Group 12 elements (such as Zn, Cd, Hg, etc.), Group 13 elements (such as B, A1, etc.), Group 4 elements (such as Ti, Ζι:, etc.) or Group 14 elements (such as Si) a compound of at least one of the element-carbon bond or the element-hydrogen bond selected from at least one compound (hereinafter referred to as "(b)") In order to increase the activity of the catalyst, an additive or an additive (hereinafter referred to as "(e) component") may be contained. Specific examples of the suitable metal compound constituting the component (a) include, for example, WC16, M〇Cl5, and ReOCl3, and the metal compounds described in Japanese Laid-Open Patent Publication No. Hei No. Hei. Specific examples of the compound constituting the component (b) include, for example, 11-C4H9Li, (C2H5)3A1, (C2H5)2A1C1, (C2H5)15A1C115, (C2H5)A1C12, methyl alumoxane, LiH, and the like. The compound described in Japanese Laid-Open Patent Publication No. Hei No. Hei. As the component (c), an alcohol, an aldehyde, a ketone, an amine or the like can be used, and other compounds can be used as disclosed in Japanese Laid-Open Patent Publication No. Hei No. Hei. [Hydrogenation] As the cyclic olefin-based resin used in the present invention, in addition to the above specific (co)ring-opening polymer and a specific saturated copolymer, hydrogenation obtained by hydrogenating a specific (co) ring-opening polymer can be used. a (co)polymer, and a hydrogenated (co)polymer obtained by hydrogenating a special (co) open-loop polymer by cyclization of a Friedel-Crafts reaction. Such a hydrogenated (co)polymer has excellent thermal stability. When it is used as a product in the forming process, it is prevented from deteriorating its properties by heating. Here, the hydrogen addition ratio of the hydrogenated (co)polymer is usually 50% or more, more preferably 70% or more, still more preferably 90% or more, still more preferably 95% or more, and particularly preferably 97% or more. The cyclic olefin resin used in the present invention has an intrinsic viscosity (η inh) measured in 3 (TC chloroform) of preferably 0.2 to 5.0 dl/g. Further, the average molecular weight of the cyclic olefin resin is The number average molecular weight (Mn) of the converted polystyrene measured by gel permeation chromatography (GPC) is preferably 8,000 to 100,000, and the weight average molecular weight (Mw) is preferably in the range of 20,000 to 300,000.

Further, the cyclic olefin resin preferably has a Vicat softening point of 110 ° C or more. Further, the cyclic olefin-based resin film used in the present invention can be formed from the above-described resin composition containing a cyclic olefin resin. In the resin composition, various additives other than the cyclic olefin resin, such as a resin component other than the cyclic olefin resin, a stabilizer, and a processability enhancer, which can be blended in the resin, can be added. In the method for producing an optical film of the present invention, the cyclic olefin-based resin is formed into a film, and is usually a long film which is continuously formed into a film, and is preferably a film having a length of 50 m or more in the longitudinal direction. The film is taken up in the form of a roll-shaped film roll. -18- 200804063 (15) The method of forming a film of a cyclic olefin resin into a film is not particularly limited, and for example, a melt molding method such as a melt extrusion method or a solution casting method (solvent casting method) is preferable. . In either case, the film is obtained in the step of winding the film into a roll shape (in the case of the melt extrusion method, the cyclic olefin resin itself, and in the case of the solution casting method, the cyclic olefin is included). A step of applying a stress of 1 to 30 kgf/cm 2 at a temperature of Tg-30 ° C to Tg + 20 ° C of the hydrocarbon-based resin and the film-like composition of the organic solvent. By performing the φ step, the phase difference in the plane of the light having a wavelength of 550 nm is 20 nm or more and 30 nm or less, the unevenness of R0 is within ±10%, and the maximum refractive index is displayed in the plane of the film. The maximum angle of the angle between the direction and the direction of the film length is 0° to 10°, and an optical film having less optical corrugation (MURA) can be easily obtained. [Melt extrusion method] The melt extrusion method is not particularly limited. For example, a conventional one-axis extruder or a two-axis extruder is used as a melt extruder to form a cyclic olefin system as a molding resin material. The resin is melted, and the molten olefin-based resin (hereinafter also referred to as "molten resin") is quantitatively measured by a gear pump and extruded from a die having a slit-like outlet. Further, it is preferable that the extruder is provided with a polymer filter to remove foreign matter in the molded resin material quantified by the gear pump, or inclusions such as char, gel, or the like generated in the melt extrusion process. Here, it is preferable that the extruder L / D is 2 8 to 40, and the screw diameter thereof varies depending on the amount of extrusion, and is usually 30 to 125 mm.于螺-19- 200804063 (16) When the rod diameter is less than 30 mm, the measurement stability and film productivity may become lower. On the other hand, when the screw diameter exceeds 1 25 mm, due to the measurement The molten resin is retained and may cause thermal deterioration to occur. As the gear pump, since the molten resin is smoothly discharged, it is suitable to use an external type. As the die, a T-die is usually used. As the T-die 'head, for example, a hanger type die, a fishtail die, and the like. Among these, a coat hanger type die is preferred. Further, the manifold is not particularly limited, and from the viewpoint of suppressing thermal deterioration of the g-shaped resin material, it is suitable to use a structure having difficulty in occurrence of retention. As the polymer filter, since the retention of the molten resin can be suppressed, a leaf disc filter is suitably used. Further, the filtration accuracy of the leaf disc filter is usually 20 μm or less, preferably 10 μm or less. When the filtration accuracy exceeds 20 μm, the inclusions are pushed through the leaf disc filter, which may cause appearance defects such as black defects on the obtained specific laminate. The film-like resin extruded from the die is usually pressed against the substrate to be thinned by cooling. As the substrate, a metal-made rotor or belt-shaped substrate or a roll-shaped substrate coated with a ceramic such as alumina or chrome oxide is suitably used. As a method of thinning, for example, a pinch type, an electrostatic method, an air knife method, a rolling method, a single-sided belt method, a double-sided belt method, a 3' roller method, etc., are used for producing a film having less optical distortion. 3 roller mode, single-sided belt mode. In the one-side belt type, a film manufacturing apparatus using a so-called sleeve (s 1 e e v e) type is preferable. For example, a mirror roller and a metal belt are disposed below the die discharge port, and a peeling roller is disposed to be arranged in parallel with the mirror roller. The above metal belt, by -20-200804063 (17), is held in tension by two holding rollers connected to the inner surface thereof. The resin discharged from the discharge port is pressed by the mirror roller and the belt, transferred to a mirror roller, cooled, and then peeled off by peeling to form a film. In the production method 1 of the present invention, in the step of melt-extruding from the base film to the winding into a roll, the ring-shaped resin has a Tg of 30 ° C to Tg + 20 ° C. At a temperature, a step of applying 1 kgf/cm2 of stress is applied. It is preferred that when the film is peeled off from the substrate, the olefin-based resin is peeled off from the substrate at a temperature of Tg-30 ° C to Tg + 20 ° C at a temperature of 1 kgf/cm 2 . The temperature condition is preferably Tg. to Tg + 10 ° C, more preferably Tg - 10 ° C to Tg + 5 ° C, and the stress is preferably ί 3 0 kgf / cm 2 , more preferably 10 to 20 kgf / cm 2 . [Solution Casting Method] As a solution casting method (solvent casting method), for example, a cyclic olefin resin is dissolved or dispersed in an organic solvent to form a solution having an appropriate concentration, and the solution is applied onto a suitable substrate to be dried. After the cyclic olefin-based resin is dissolved or dispersed in a solvent, the resin is usually 〇. 1 to 90% by weight, preferably ί 5 〇 by weight, more preferably 10 to 35 by weight. %. When the concentration of the resin is less than the above, it is difficult to confirm the thickness of the film. Further, bubbles or the like are generated accompanying evaporation of the solvent, thereby producing a problem such as smoothness of the surface of the film. On the other hand, when the concentration is exceeded, the viscosity of the solution becomes too high, and the thickness of the obtained optical film becomes difficult to be uniform, which is not preferable.

Use a metal roller to strip the olefin ~30 at the ring ~30 2 0 °C. The tree is cast or the bismuth concentration is ideal for thinning. The above, Table-21 - 200804063 (18) Moreover, the viscosity of the above solution at room temperature is usually 1 ~1,000,000 (mPa.s) 'It is ideally 1〇~l〇〇,〇〇〇(mpa.s), more ideally ι〇〇~ 100,000(mPa.s) 'Special ideal is 1,〇〇 〇~i〇,〇〇〇(mPa.s). The solvent used herein, for example, an aromatic solvent such as benzene, toluene or xylene, methyl cellosolve, ethyl celecoxib, or I-methoxy-2-propanol Sodium solvent, diacetone alcohol, acetone, cyclohexanone, methyl ethyl ketone, 4-methyl-2-pentanone, cyclohexanone, ethyl cyclohexanone, 1,2-dimethylcyclohexanone Ketone solvent, ester solvent such as methyl lactate or ethyl lactate, chlorine solvent such as 2,2,3,3-tetrafluoro-1-propanol, dichloromethane or chloroform, tetrahydrofuran, dioxane An alcohol solvent such as an ether solvent or 1-pentanol or 1-butanol. Further, in addition to the above, when SP 値 (solubility parameter) is used, it is usually 10 to 30 (MPa 1/2), preferably 10 to 25 (MPa 1/2), more preferably 15 to 25 (MPa 1/2), and particularly preferable. A film having a surface uniformity and optical characteristics is obtained as a solvent in the range of 1 5 to 20 (MPa 1/2). These solvents may be used alone or in combination of two or more. In the case where two or more kinds are used, the sp値' as a mixture can be obtained from the weight ratio thereof. For example, in the case of two kinds of mixtures, the weight fraction of each solvent is w 1 and w 2 , respectively, and SP値 is SP1. The SP値 of the mixed solvent of SP2 can be obtained by the calculation of the following formula SP 値=W1.SP1+W2.SP2. The temperature in the case where the cyclic olefin resin solution is dissolved in a solvent can be at room temperature or at a local temperature. A thorough solution is obtained by fully stirring with -22-200804063 (19). Further, in the case of coloring as needed, a dye or pigment coloring agent may be appropriately added to the solution. Further, in order to improve the surface smoothness of the film, a leveling agent may be added. Any general leveling agent can be used, and for example, a fluorine-based nonionic surfactant, a special acrylate-based leveling agent, a xenon-based leveling agent, or the like can be used. As a method of producing the film used in the present invention by a solution recording method, for example, the above solution is applied to a metal drum (mold drum), an iron belt, and a teflon tape using a die and a coater. a substrate such as a belt, a polyester film (base film) such as polyethylene terephthalate (PET) or polyethylene naphthalate (PEN), and then drying and removing the solvent from the substrate. The method of stripping. In the present invention, before the substrate is peeled off, the solvent is not completely removed, and the film-form composition containing the resin and the solvent is peeled off from the substrate, and the solvent is dried to remove the solvent to obtain an optical film. The film-like composition preferably contains 5 to 30% by weight, more preferably 5 to 20% by weight of a solvent, from the substrate. Further, the resin solution is applied to the substrate by spraying, brushing, rolling, spin coating, dipping, or the like, and then dried. The solvent is removed and peeled off from the substrate. Further, thickness, surface smoothness, and the like can be controlled by reverse coating. Further, when a base film such as a polyester film is used as the substrate, a surface-treated film can also be used. As a method of surface treatment, for example, a method of general hydrophilization treatment, for example, a method of laminating an acrylate-based resin or a sulfonate group-containing resin by coating or lamination, or a corona discharge treatment or the like A method of increasing the hydrophilicity of the surface of the film. In the present invention, it is preferred to use a casting drum, a belt or a base film as a substrate. Further, the step of drying (solving the solvent) of the film-form composition after peeling off from the substrate or from the substrate is not particularly limited, and a general method can be used, for example, it can be passed through a drying oven through a plurality of rollers. In the drying step, if bubbles are generated by evaporation of the solvent, the characteristics of the film are remarkably lowered. In order to avoid this, the drying step is a plurality of steps of two or more steps, and the temperature or air volume of each step is controlled. More ideal. The amount of the solvent remaining in the finally obtained optical film is usually 1% by weight or less, more preferably 5% by weight or less, still more preferably 1% by weight or less, and particularly preferably 0.5% by weight or less. Here, when the amount of the residual solvent is more than 10% by weight, when the film is actually used, the dimensional change changes over a long period of time, which is undesirable. Further, since Tg is lowered by the residual solvent, heat resistance is also lowered, which is not preferable. Further, the dried film peeled off from the substrate is usually wound into a roll shape. Further, in order to be suitable for the stretching step to be described later, it is necessary to appropriately adjust the amount of the solvent remaining in the above φ to be within the above range. Specifically, in order to extend the phase difference, the phase difference is found to be uniformly found, and the amount of residual solvent is usually 1 〇 〇 1 1% by weight, preferably 5 〇. 1% by weight, more preferably 1 〜 〇·1% by weight. Since a small amount of solvent remains, it is easy to make the stretching process easy, or the control of the phase difference becomes easy. In the production method 2 of the present invention, the cyclic olefin resin is dissolved or dispersed in an organic solvent, cast on a substrate, and a part of the organic solvent is removed to form a film-like composition, and the film-like composition is peeled off from the substrate. And the step of removing the organic solvent and winding the film into a roll-shaped optical film, in any step from the peeling of the film-like composition of the base-24-200804063 (21) to winding into a roll, having a film shape A step of applying a stress of 1 to 30 kgf/cm2 at a temperature of Tg-30 ° C to Tg + 20 ° C of the composition. Here, the Tg of the film-like composition is the Tg measured by the DSC curve measured by the film-like composition at a temperature rise of 20 ° C /min, specifically, under the condition of the above D The temperature at the inflection point of the measured DSC curve. Further, in the production method 2, it is preferred to apply a film-like composition from the substrate, and apply 1 to 30 kgf at a temperature of Tg-30 ° C to Tg + 20 ° C of the film φ-like composition. The /cm2 stress is peeled off from the substrate. The temperature condition is preferably Tg - 20 ° C ~ Tg + 10 ° C, more preferably Tg - 10 ° C ~ Tg + 5 ° C, the stress is 5 ~ 3 0 kgf / cm 2 is ideal, 10 ~ 20 Kgf/cm2 is more ideal. Optical film The optical film of the present invention is composed of a cyclic olefin resin, and the refractive index of the direction showing the maximum refractive index in the plane of the film having a light wavelength of 550 nm is nx, which is perpendicular to the nx in the plane of the film. When the refractive index is ny and the film thickness is d [nm], the phase difference R0 (5 50) [nm] = (nx-ny) in the film plane is the parent (1 is 2〇11111 or more 27〇11111 or less, 110 is not Uniformity within ±10%, % and the maximum 値 of the angle of the film showing the direction of the maximum refractive index and the direction of the film length (hereinafter also referred to as "") is 0° to 10°. The phase difference (R0(550)) in the surface of the film of 5 50 nm is 20 nm or more and 300 nm or less, more preferably 50 nm or more and 280 nm or less, and particularly preferably 100 nm or more and 280 nm or less. The phase difference is less than 20 nm, and the characteristics of the retardation film are insufficient. If it exceeds 300 -25 - 200804063 (22) nm, there is a problem that the phase difference film cannot be used. Moreover, the unevenness of R0 is within 10% of the soil. Preferably, it is within ±5%, and particularly preferably within ±3 %. Moreover, the above one is ^10. Preferably, it is 〇°~5°, and particularly preferably 0°~1°. If Θ! exceeds 10. The optical film is used in a polarizing plate, etc., when a display element such as a liquid crystal panel is assembled, a contrast change occurs. The problem arises by observing the orientation of the display element. φ The optical film of the present invention further has a phase difference in the film thickness direction

Rth(5 5 0) = {(nx + ny)/2-nz}xd (but nz is the refractive index in the thickness direction of the film) is preferably 30 nm to 200 nm, and more preferably 50 nm to 200 nm. Further, the maximum 値 of the angle of the refractive index in the thickness direction of the film and the angle to the normal to the film surface (hereinafter also referred to as "Θ 2") is 0. ~5. Ideally, 0. ~1 ° is more ideal. The optical film of the present invention is suitably obtained by the above production method 1 or production method 2. The obtained optical film can be provided as an extension film by stretching φ ' as it is, or wound into a roll shape as a film roll. The thickness of the optical film used in the present invention is usually from 1 to 500 μm, more preferably from 1 to 300 μm, and even more preferably from 2 to 2 0 0 μm. In the case of less than 2 μηη, it is practically difficult to use. On the other hand, when the film is wound into a roll shape in the case of more than 5 μm, there is a so-called "curl tendency", and handling such as processing becomes difficult. The thickness distribution of the optical film used in the present invention is usually within ±20% of the average enthalpy, more preferably within ±1 〇〇/〇, more preferably within 5% of the soil, and particularly preferably within ±1%. . Further, the variation of the thickness per 1 cm is usually -30-200804063 (23), and is preferably 10% or less, more preferably 5% or less, more preferably 1% or less, and particularly preferably 0.5% or less. By performing such thickness control, the distribution of the in-plane phase difference is smaller, and an optical film having uniform optical characteristics and an extended film obtained therefrom can be obtained. The optical film of the present invention has excellent properties such as transparency, heat resistance, water resistance, chemical resistance, and the like, and is excellent in optical uniformity, and can be used as it is for an optical film such as a protective film. Further, by performing stretching, it is found that the phase difference is suitable for the production of a retardation film having high uniformity. Method for Producing Stretch Film The method for producing an stretch film of the present invention is characterized in that the optical film of the present invention is stretched in the width of the film or in the longitudinal direction of the film. Further, by adjusting the phase difference 値 in the plane of the film of the optical film of the present invention to arbitrarily, the film φ obtained by extending the two axes in the longitudinal direction and the width direction is generally obtained by extending only in the width direction. Further, the optical film of the present invention is further extended in the longitudinal direction, and the in-plane retardation can be found again. The temperature of the cyclic olefin resin constituting the optical film at a temperature of Tg - 10 ° C to Tg + 20 ° C is preferably a temperature of Tg - 5 ° C _ T g + 15 ° C. The width direction or the length direction is extended to a range of from 1 to 1 to 5.0 times, preferably from 1.5 to 2.5 times, to produce an optically uniform film. In the present invention, as the apparatus used for stretching the film, it is preferable to use a tenter type transverse stretching machine, and a two-axis simultaneous stretching machine can be used. The speed at which the film is stretched is usually from 1 to 5,000%/min, more preferably from -27 to 200804063 (24) 50 to 1,000%/min, more preferably from 100 to 1,000 °/. / min, especially ideally 1 00 ~ 500% / min ° extended film, can be cooled as it is, set at Tg-20 ° C ~ Tg temperature environment for at least 10 seconds or more, 30 seconds ~ 60 minutes is ideal , 1 minute ~ 60 minutes is more ideal, ideal for heat curing. Thereby, it is possible to obtain a stretched film which has a long history of change in the phase difference of the light passing through and is stable. The stretched film of the present invention is suitably used as a retardation film, for example, laminated on at least one side of a polarizing film (polarizer) to form a polarizing plate. The stretched film of the present invention and the above polarizing plate can be used for various optical parts. For example, it can be used in a mobile phone, a digital information terminal, a pager, a navigation machine, a vehicle liquid crystal display, a liquid crystal monitor, a dimming panel, an OA (office automation) machine display, an AV (Audio Visual) machine display, etc., relating to the present invention. Various liquid crystal displays, electroluminescent display elements, touch panels, and the like. Further, there are wavelength plates used in recording/reproducing apparatuses for optical discs such as CDs, CD-Rs, MDs, MOs, and DVDs. [Examples] Hereinafter, the present invention will be specifically described based on examples, but the present invention is not limited to these examples. In addition, the following "parts" and "%" are limited unless otherwise specified - the external means "parts by weight" and "% by weight". Further, in the following examples, the glass transition temperature, the saturated water absorption rate, the total light transmittance, the in-plane phase difference of the transmitted light, the optical axis tilt angle in the film thickness direction, the transmittance of the polarizing plate, and the degree of polarization, reflectance, and bright spot. The number and scratch resistance were measured by the following methods. -28- 200804063 (25) [Glass transition temperature (Tg)] The Seiko instruments differential scanning calorimeter (DSC) was used to measure the temperature at a temperature of 20 °C /min under nitrogen atmosphere. Glass transition temperature. [Saturated water absorption rate] g The sample was immersed in water at 23 ° C for 1 week according to A S TM D 5 7 0, and the change in weight of the sample before and after the immersion was measured, and the saturated water absorption rate was determined from the enthalpy. [Total Light Transmittance] The total light transmittance was measured using a haze meter "HM-150" manufactured by Murakami Color Technology Research Institute. [Optical characteristics (R0, Rth, θη θ2)] • The measurement was carried out at a wavelength of 5 5 0 n m using "KOBRA-21ADH" manufactured by Oji Scientific Instruments Co., Ltd. [Transmittance and Polarization of Polarizing Plate] The transmittance and the degree of polarization of the polarizing plate were measured using "KOBRA-21 ADH" manufactured by Oji Scientific Instruments Co., Ltd. The measurement wavelength was 550 nm. <Synthesis Example 1 > In a nitrogen-substituted reactor, 8-methyl- 29-200804063 (26) -8-resylmethyltetracyclo[4.4.0 · 1 2 was placed as a specific monomer. 5. i7,1 〇] - 3 - 12 suspected 2 2 5 parts, double ring as a monomer of oxen oxime [2.2.1] 25 parts of hept-2-dens, 1 -hexene 2 as a molecular weight regulator And 75 parts of toluene as a solvent, heating the solution to 60 ° C °, then, in the solution in the reaction vessel, adding 0.62 parts of a toluene solution containing a concentration of 1.5 mol / liter of triethyl aluminum and 3.7 A portion containing tungsten hexachloride modified with 3.8 butanol and methanol (3 butyl alcohol: methanol: tungsten = 0.35 mole: 0 · 3 moles: 1 mole) 〇. 〇 5 mol / The toluene solution was stirred up as a polymerization catalyst, and the reaction was carried out by heating and stirring at 8 ° C for 3 hours to carry out ring-opening copolymerization to obtain a ring-opening copolymer solution.

1000 parts of the thus obtained ring-opening copolymer solution was placed in an autoclave, and 0.12 parts of RuHC1(CO)[P(C6H5)3]3 was added to the ring-opening copolymer solution at a hydrogen pressure of 1 〇〇kg. /cm2, the reaction temperature was 1 65 ° C, and the mixture was heated and stirred for 3 hours to carry out a hydrogenation reaction, and the obtained reaction solution (hydrogenated polymer solution) was cooled, and then the hydrogen pressure was released. The reaction solution was placed in a solvent removal apparatus, and the solvent was removed to 500 ppm or less to obtain a particulate φ hydrogenated polymer (hereinafter referred to as "resin A1"). The hydrogen addition rate of this resin A measured by 1 H-NMR was 99.9%. When the number average molecular weight (Μη) and the weight average molecular weight (Mw) of the converted polystyrene were measured by gel permeation chromatography (GPC, solvent: tetrahydrofuran) for the resin A1, the number average molecular weight (?n) was 20,800, weight average molecular weight (Mw) was 62,000, and molecular weight distribution (Mw/Mn) was 3.00. Further, the glass transition temperature (Tg) of the resin A was 130 ° C, and the saturated water absorption at 23 ° C was 〇·3%. Further, when the intrinsic viscosity (Tlinh) was measured in chloroform at 30 ° C, it was 0.5 1 dl / g. -30- 200804063 (27) <Preparation Example 1> 250 parts of steamed water was placed in a reaction vessel, and 90 parts of butyl acrylate and 8 parts of 2-hydroxyethyl methacrylate were added to the reaction container. After 2 parts of vinylbenzene and 1 part of potassium oleate, the system was subjected to dispersion treatment by stirring with a stirring blade made of polytetrafluoroethylene. Then, the inside of the reaction vessel was replaced with nitrogen. The temperature of the system was raised to 50 ° C, and 0.2 parts of potassium persulfate was added to start polymerization. Two hours after the start of the polymerization, 1 part of potassium persulfate was added to the polymerization system, and the system was heated to 80 ° C, and the polymerization was continued for 1 hour to obtain a polymer dispersion. Then, the polymer dispersion was concentrated to a solid concentration of 70% using an evaporator to obtain an aqueous adhesive (adhesive having a polar group) composed of an aqueous dispersion of an acrylate-based polymer. The acrylate-based polymer constituting the water-based adhesive thus obtained (hereinafter referred to as "water-based adhesive A") was measured by gel permeation chromatography (GPC, solvent: tetrahydrofuran) to measure the average number of converted polystyrene. When the molecular weight (??) and the weight average molecular weight (Mw), the number average molecular weight (??) was 69,000, and the weight average molecular weight (Mw) was 135,000. Further, the water-based adhesive A was measured for intrinsic viscosity in chloroform at 30 ° C (I2 dl/g when ηιηι〇. [Example 1] Resin A was used in a 2-axis extruder (Toshiba Machinery Co., Ltd.; TEM-48) is extruded downstream with a gear, and a metal fiber sintered filter made of 曰本精线 is used for melt filtration using a general-purpose pore size of 10 μηη -31 - 200804063 (28). 650 mm wide), the gap at the exit of the T-die is 〇·5 mm, and the film is extruded at 280 ° C. The extruded film is sandwiched between the surface roughness of the coated aluminum oxide Rs max 値Rmax The surface of the film is transferred to a glossy surface between a cooling roller of (pm) of 0.1 and a metal tape of 3·3 mm thick. Then, the surface roughness Rs of the surface-coated alumina is used as a maximum 値|Rmax(pm The peeling roller of 0.1 was peeled off. At this time, the temperature of the resin was changed to Tg + 3 °C by adjusting the temperature of the roller, and it was confirmed by a temperature sensor, and the stress at the time of peeling was adjusted to 23 kgf/cm2. 2 The rotation speed of the roller. Then, the resin film is peeled off from the mirror roller to make it A protective film having a thickness of 50 μm was bonded to each other to obtain a resin film having a thickness of 100 μm and a length of 2000 m (hereinafter also referred to as "resin film (al)"). Results of various evaluations on the resin film (a-1) The total light transmittance of the obtained resin film (a-1) was 93%. [Example 2] Using the resin film (a-1) obtained in Example 1, at τ g + 1 〇 ° C, using a tenter type transverse stretcher, extending to 1.5 times, to obtain a resin film (a_2). The results of various evaluations are summarized in Table 1. The total light transmittance of the resin film (a_2) It is 93%. [Example 3] -32- 200804063 (29) A polyvinyl alcohol film having a thickness of 50 μm was immersed in 5 g of iodine, 250 g of potassium iodide, 1 g of boric acid, and 1 〇〇〇g. The 40° 〇 bath formed by water was stretched one to four times in about 5 minutes to obtain a polarizing film. The water-based adhesive obtained in the first modification was used for the surface of the polarizing film, and the film prepared in Example 1 was used. The resin film (a-1) was bonded to one surface of the polarizing film, and the resin film produced in Example 2 was used ( A-2) adhered to the other side of the polarizing film to obtain a polarizing plate (1) having a transmittance of 40% and a degree of polarization of 99.9%. The polarizing plate (1) was subjected to 80 ° C and 90% relative humidity. When the appearance change was observed by visual observation, it was considered that there was no abnormal appearance such as whitening or swelling, and the degree of polarization was maintained at 95% or more for the initial flaw. Confirmed to have durability. Further, the polarizing plate (1) is bonded to the upper and lower sides of the liquid crystal cell of the VA liquid crystal television in a state where the two polarized plates are vertically polarized, and when the visibility is confirmed, it is confirmed that there is no waviness and a good viewing angle compensation effect. [Comparative Example 1] A resin film (b-1) was obtained in the same manner as in Example 1 except that the rotation speed of the cooling roller and the peeling roller was adjusted. The results of various evaluations of the resin film (b-Ι) are summarized in Table 1. Further, the resin film (b-Ι) had a total light transmittance of 92%. [Comparative Example 2] The film was stretched in the same manner as in Example 2 except that a resin film (b-Ι) was used to obtain a resin film (b-2). The results of various evaluations of the resin film (b-2) -33-200804063 (30) are summarized in Table 1. Further, the resin film (b_2) had a total light transmittance of 92%. [Comparative Example 3] A transmittance of 40% and a polarized light were obtained in the same manner as in Example 3 except that the resin film (b-1) was used instead of the resin film (a_1}, and the resin film (b_2) was used instead of the resin film (a-2). 99.9 % of the polarizing plate (2). The polarizing plate (2) was subjected to a durability test of 5 hrs at 80 ° C and 90% relative humidity, and the appearance change was visually observed. There is no abnormality in appearance such as whitening or swelling, and the degree of polarization of the initial enthalpy can be maintained at 95% or more, and durability is confirmed. However, the polarizing plate (2) is perpendicular to each other. The state of the polarized light is applied to the upper and lower sides of the liquid crystal cell of the VA type liquid crystal television, and when the visibility is confirmed, it is confirmed that the entire light is leaked and some of the light is partially leaked, and the viewing angle compensation effect is insufficient.

[Table 1] Example 1 Example 2 Comparative Example 1 Comparative Example 2 R0 (nm) 130 50 8 98 R〇 unevenness (%) 2 1 50 3 Rth (nm) 70 140 12 68 θι 0.9 - 32 θ2 0.1 - 1.1 -34-

Claims (1)

200804063 (1) X. Patent Application No. 1, a method for producing an optical film, which comprises: extruding a molten cyclic olefin resin from a die, pressing and adhering to a substrate, and thinning from the substrate The step of producing the optical film by peeling off the film and winding it into a roll shape has a Tg of 30 ° C to Tg + in the cyclic olefin resin in any step from the peeling of the film to the winding of the substrate. A step of applying a stress of 1 to 30 kgf/cm 2 at a temperature of 20 ° C. The method for producing an optical film according to claim 1, wherein when the film is peeled off from the substrate, the cyclic olefin resin is subjected to a stress at a temperature of Tg-30 ° C to Tg + 20 ° C. 1 to 30 kgf/cm2, peeled off from the substrate. A method for producing an optical film, which comprises dissolving or dispersing a cyclic olefin-based resin in an organic solvent, casting it on a substrate, and removing a part of the organic solvent to form a film-like composition. The step of removing the film-like composition, removing the organic solvent, and winding the film into a roll-shaped optical film, in the step of peeling the film-form composition from the substrate to the roll-to-roll shape, has a film shape The step of applying Tg-3 (TC to Tg + 20 ° C at a temperature of 1 to 30 kgf/cm 2 at the temperature of the composition (however, the T g of the film-like composition appears to mean the film-like composition) The method for producing an optical film according to the third aspect of the invention, wherein the film-like composition is peeled off from the substrate, the Tg is determined by a DSC curve at a temperature rise of 20 ° C /min. The Tg of the film-like composition is peeled off from the substrate at a temperature of Tg-30 ° C to Tg + 20 ° C at a temperature of 1 to 30 kgf/cm 2 (however, the so-called Tg of the film-like composition) , means that the film-like composition is heated at 2 (TC/min) The Tg measured by DSC 曲-35- 200804063 (2). 5. An optical film characterized by a ring-shaped olefin resin and a film in-plane with a light wavelength of 550 nm. The refractive index in the direction showing the maximum refractive index is nx, and the refractive index in the plane of the film perpendicular to nx is 'ny, and the thickness of the film is d [nm], the phase difference in the plane of the film is R0 (550) [nm] = (nx-ny)xd is 20 nm φ or more and 300 nm or less, and the unevenness of R0 is within ±10%, and the maximum angle of the angle between the direction in which the maximum refractive index is displayed in the film plane and the direction of the film length is The optical film of the fifth aspect of the invention, wherein the cyclic olefin resin is a resin obtained by polymerizing or copolymerizing at least one compound represented by the following formula (1); [1] R1 (In the formula (1), R1 to R4 are a hydrogen atom, a halogen atom, a hydrocarbon group having 1 to 30 carbon atoms or another monovalent organic group, which may be the same or different, and any two of R1 to R4 may mutually Bonding to form a single or polycyclic structure; m is 0 or a positive integer, P is 0 or a positive integer). A method for producing an elongated film, which is characterized in that the optical film of the fifth to sixth aspects of the patent application is extended in the film width direction. -36- 200804063 (3) 8. A method for producing an elongated film, characterized in that the optical film of the patent application SJ 5 to the table 6 is extended in the longitudinal direction of the film. A method for producing an elongated film, which is characterized in that the method of the first to fourth aspects of the invention is continued, and the obtained optical film is stretched in the width direction of the thin r' film. -37- 200804063 Explain that there is no simple figure for the map element: the table pattern represents the book without the ZN. One or two refers to the CC. 8. If there is a chemical formula in this case, please reveal the chemical formula that best shows the characteristics of the invention: None -4-