CN116490291A - Optical film and method for producing same - Google Patents
Optical film and method for producing same Download PDFInfo
- Publication number
- CN116490291A CN116490291A CN202180079133.0A CN202180079133A CN116490291A CN 116490291 A CN116490291 A CN 116490291A CN 202180079133 A CN202180079133 A CN 202180079133A CN 116490291 A CN116490291 A CN 116490291A
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- CN
- China
- Prior art keywords
- film
- polycarbonate
- optical film
- easy
- based polyurethane
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000004519 manufacturing process Methods 0.000 title claims description 28
- 239000010408 film Substances 0.000 claims abstract description 216
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- 239000011347 resin Substances 0.000 claims abstract description 108
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- 239000004417 polycarbonate Substances 0.000 claims abstract description 68
- 125000002723 alicyclic group Chemical group 0.000 claims abstract description 54
- 230000009477 glass transition Effects 0.000 claims abstract description 35
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- 238000000034 method Methods 0.000 description 28
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- 125000005587 carbonate group Chemical group 0.000 description 2
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 2
- MMCOUVMKNAHQOY-UHFFFAOYSA-N carbonoperoxoic acid Chemical compound OOC(O)=O MMCOUVMKNAHQOY-UHFFFAOYSA-N 0.000 description 2
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- 238000007765 extrusion coating Methods 0.000 description 1
- 239000006081 fluorescent whitening agent Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000004313 glare Effects 0.000 description 1
- 238000007756 gravure coating Methods 0.000 description 1
- 125000005843 halogen group Chemical group 0.000 description 1
- 239000012760 heat stabilizer Substances 0.000 description 1
- YVSCCMNRWFOKDU-UHFFFAOYSA-N hexanedioic acid Chemical compound OC(=O)CCCCC(O)=O.OC(=O)CCCCC(O)=O YVSCCMNRWFOKDU-UHFFFAOYSA-N 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000005984 hydrogenation reaction Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000010102 injection blow moulding Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 229910052809 inorganic oxide Inorganic materials 0.000 description 1
- 150000002513 isocyanates Chemical class 0.000 description 1
- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 239000004611 light stabiliser Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 1
- 239000000391 magnesium silicate Substances 0.000 description 1
- 229910052919 magnesium silicate Inorganic materials 0.000 description 1
- 235000019792 magnesium silicate Nutrition 0.000 description 1
- 150000007974 melamines Chemical class 0.000 description 1
- CRVGTESFCCXCTH-UHFFFAOYSA-N methyl diethanolamine Chemical compound OCCN(C)CCO CRVGTESFCCXCTH-UHFFFAOYSA-N 0.000 description 1
- SLCVBVWXLSEKPL-UHFFFAOYSA-N neopentyl glycol Chemical compound OCC(C)(C)CO SLCVBVWXLSEKPL-UHFFFAOYSA-N 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 125000004043 oxo group Chemical group O=* 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 125000005740 oxycarbonyl group Chemical group [*:1]OC([*:2])=O 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- RGSFGYAAUTVSQA-UHFFFAOYSA-N pentamethylene Natural products C1CCCC1 RGSFGYAAUTVSQA-UHFFFAOYSA-N 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000011941 photocatalyst Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920001230 polyarylate Polymers 0.000 description 1
- 229920001692 polycarbonate urethane Polymers 0.000 description 1
- 229920005906 polyester polyol Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 229920006393 polyether sulfone Polymers 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- RCELIUVBCJZGTR-UHFFFAOYSA-M potassium;hydroxy-oxido-dioxochromium Chemical compound [K+].O[Cr]([O-])(=O)=O RCELIUVBCJZGTR-UHFFFAOYSA-M 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- AOHJOMMDDJHIJH-UHFFFAOYSA-N propylenediamine Chemical compound CC(N)CN AOHJOMMDDJHIJH-UHFFFAOYSA-N 0.000 description 1
- KIDHWZJUCRJVML-UHFFFAOYSA-N putrescine Chemical compound NCCCCN KIDHWZJUCRJVML-UHFFFAOYSA-N 0.000 description 1
- 239000011342 resin composition Substances 0.000 description 1
- 238000007151 ring opening polymerisation reaction Methods 0.000 description 1
- 238000007127 saponification reaction Methods 0.000 description 1
- 125000005372 silanol group Chemical group 0.000 description 1
- 150000004819 silanols Chemical class 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 238000007767 slide coating Methods 0.000 description 1
- 239000012748 slip agent Substances 0.000 description 1
- 238000004528 spin coating Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000001384 succinic acid Substances 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 125000004434 sulfur atom Chemical group 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- XBFJAVXCNXDMBH-UHFFFAOYSA-N tetracyclo[6.2.1.1(3,6).0(2,7)]dodec-4-ene Chemical compound C1C(C23)C=CC1C3C1CC2CC1 XBFJAVXCNXDMBH-UHFFFAOYSA-N 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 238000005809 transesterification reaction Methods 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 1
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 1
- QXJQHYBHAIHNGG-UHFFFAOYSA-N trimethylolethane Chemical compound OCC(C)(CO)CO QXJQHYBHAIHNGG-UHFFFAOYSA-N 0.000 description 1
- YFTHZRPMJXBUME-UHFFFAOYSA-N tripropylamine Chemical compound CCCN(CCC)CCC YFTHZRPMJXBUME-UHFFFAOYSA-N 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
- 150000003672 ureas Chemical class 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/02—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to macromolecular substances, e.g. rubber
- B05D7/04—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to macromolecular substances, e.g. rubber to surfaces of films or sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/40—Layered products comprising a layer of synthetic resin comprising polyurethanes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/02—Physical, chemical or physicochemical properties
- B32B7/023—Optical properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/02—Physical, chemical or physicochemical properties
- B32B7/027—Thermal properties
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/02—Details
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/8793—Arrangements for polarized light emission
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light
Abstract
The purpose of the present invention is to provide an optical film which has excellent adhesion between a cycloolefin film having a high stretching ratio (stretching ratio of 2.5 times or more) and an easily-bonded layer and which is hardly peeled from other components such as a polarizer. The optical film of the present invention is characterized by comprising: the resin film comprises a resin film containing a polymer having an alicyclic structure as a main component, and an easy-to-bond layer laminated on one surface of the resin film, wherein the easy-to-bond layer contains a polycarbonate-based polyurethane as a main component, and the glass transition temperature (Tg) of the polycarbonate-based polyurethane is 100-150 ℃.
Description
Technical Field
The present invention relates to an optical film having a resin film containing a polymer having an alicyclic structure as a main component and an easy-to-bond layer laminated on one surface thereof, and a method for producing the same. The present invention further relates to a polarizing plate and an image display apparatus each including the optical film.
Background
In recent years, the use of organic electroluminescent display devices, touch panels, and the like has been expanding. Various resin films are used for the protective film, the retardation film, and the like of such a device. Among them, cycloolefin films made of cycloolefin polymers are preferable because they have high heat resistance, excellent dimensional stability, and low photoelastic coefficient, and therefore can suppress birefringence to a low level, and are also excellent in optical characteristics.
Since the cycloolefin film does not have a nonpolar film having a polar group or a polar group is extremely small, it lacks adhesion, and a cover layer such as an easy-to-bond layer is laminated and bonded to other components such as a polarizer through the cover layer.
For example, patent document 1 describes a multilayer film in which an easy-to-bond layer made of polycarbonate polyurethane is provided on an extended film so that the elongation of a monomer film in a dry state is 300% to 1000% in order to improve the bonding property between the extended film made of a cycloolefin polymer and a polarizer.
Patent document 2 describes an optical film in which an easily-bonded layer made of a polycarbonate-based polyurethane having a glass transition temperature (Tg) of-16 ℃ is provided on a crystalline resin film made of an alicyclic structure-containing polymer in order to provide an optical film bonded to other components constituting a touch sensor with high peel strength.
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open publication No. 2019-116640
Patent document 2: WO2018/079627.
Disclosure of Invention
Technical problem to be solved by the invention
However, the present inventors have found that, after forming an easy-to-bond layer made of polycarbonate-based polyurethane on a cycloolefin film, in a cycloolefin film having a high stretching ratio (stretching ratio is 2.5 times or more), even in the easy-to-bond layer made of the polycarbonate-based polyurethane, adhesion between the cycloolefin film and the easy-to-bond layer is insufficient, and there is a problem that peeling is likely to occur between the cycloolefin film and other constituent elements such as a polarizer.
The present invention has been made in view of the above-described problems, and an object of the present invention is to provide an optical film which has excellent adhesion between a cycloolefin film having a high stretching ratio (stretching ratio of 2.5 or more) and an easy-to-bond layer, and which is hardly peeled off from other components such as a polarizer.
Means for solving the technical problems
As a result of intensive studies on an easy-to-bond layer having excellent adhesion to a cycloolefin film having a high stretching ratio, the inventors of the present invention have found that the adhesion to an easy-to-bond layer is excellent even in a cycloolefin film having a stretching ratio of 2.5 times or more by setting the easy-to-bond layer to be made of a polycarbonate polyurethane having a carbonate skeleton in a molecular structure at a glass transition temperature of 100 ℃ or more and 150 ℃ or less, and have completed the present invention.
According to the present invention, there is provided:
(1) An optical film comprising a resin film and an easy-to-bond layer, wherein the resin film contains a polymer having an alicyclic structure as a main component, the easy-to-bond layer is laminated on one surface of the resin film, the easy-to-bond layer comprises a polycarbonate-based polyurethane as a main component, and the polycarbonate-based polyurethane has a glass transition temperature (Tg) of 100 ℃ to 150 ℃.
(2) The optical film according to (1), wherein the resin film is an extended film.
(3) The optical film according to (2), wherein the stretching magnification of the stretched film is 2.5 times or more in terms of area ratio.
(4) The optical film according to any one of (1) to (3), wherein the polycarbonate-based polyurethane has a Young's modulus of 570MPa or more and 1300MPa or less.
(5) The optical film according to any one of (1) to (4), wherein the elongation at break of the polycarbonate-based polyurethane is less than 300%.
(6) The optical film according to any one of (1) to (5), wherein the acid value of the polycarbonate-based polyurethane is 25mgKOH/g or less.
(7) The optical film according to any one of (1) to (6), wherein the peel strength of the polycarbonate-based polyurethane-based resin film and the easily-bonded layer is 2.0N/25mm or more.
(8) The polarizing plate according to any one of (1) to (7), wherein the optical film, the adhesive layer and the polarizer are laminated in this order in such a manner that the adhesive layer is in contact with the adhesive layer.
(9) An image display apparatus comprising the polarizing plate of (8).
(10) A method for producing an optical film, characterized by comprising the steps of: a step of forming a coating film by applying a coating liquid containing an aqueous solvent and a polycarbonate-based polyurethane having a glass transition temperature (Tg) of 100 ℃ to 150 ℃ inclusive to at least one surface of a resin film containing a polymer having an alicyclic structure as a main component; and a step of forming an easy-to-bond layer by drying the coating film.
Effects of the invention
The optical film of the present invention is formed by using a polycarbonate-based polyurethane having a polycarbonate skeleton in a molecular structure and having a glass transition temperature (Tg) of 100 ℃ or more and 150 ℃ or less as the easy-to-bond layer, and even if the film is a cycloolefin film having a high stretching ratio (stretching ratio of 2.5 times or more), the adhesion between the cycloolefin film and the easy-to-bond layer is excellent, and the adhesion between the film and other components such as a polarizer is also excellent.
Drawings
Fig. 1 is a cross-sectional view showing an example of an optical film of the present invention.
Fig. 2 is a cross-sectional view showing an example of the polarizing plate of the present invention.
Detailed Description
The present invention is described in detail below. The present invention is not limited to the following embodiments, and various embodiments are possible within a range where the effects of the present invention can be exerted.
[ outline of optical film ]
The optical film of the present invention has an easily-bonded layer containing a polycarbonate-based polyurethane as a main component on one surface of a resin film containing a polymer having an alicyclic structure as a main component.
[ resin film ]
The resin film is formed of a thermoplastic resin containing a polymer having an alicyclic structure as a main component. The term "main component" as used herein means a component constituting the resin film, wherein the component ratio is 50% by weight or more, preferably 60% by weight or more, more preferably 80% by weight or more, still more preferably 90% by weight or more, and particularly preferably 95% by weight or more.
The resin film may or may not be subjected to the stretching treatment, but is preferably subjected to the stretching treatment. The stretching treatment may be uniaxial stretching or biaxial stretching, but it is preferable that the stretching ratio is 2.5 times or more in terms of area ratio. Generally, in the case of an extended resin film, the polar groups of the polymer molecules that are oriented in random directions before extension will be arranged on parallel planes of the film surface depending on the alignment of the polymer molecules in the resin due to extension. In particular, in a resin film containing a polymer having an alicyclic structure such as a cycloolefin polymer, the polar group is not likely to occur in a direction perpendicular to the surface due to the arrangement of the alicyclic structure having a large volume, and therefore, there is a possibility that the adhesion is lowered due to lack of accessibility between the polar group and the polar group such as polyurethane forming an easy-to-bond layer. The higher the elongation (elongation ratio of 2.5 times or more) the lower the adhesion. However, the optical film of the present invention can achieve high adhesion by the easy-to-bond layer containing a polycarbonate-based polyurethane having a glass transition temperature (Tg) of 100 ℃ or more and 150 ℃ or less as a main component. Therefore, the optical film of the present invention is preferably provided with a resin film (sometimes referred to as a stretched film) subjected to stretching treatment, which is a means for effectively solving the problems that have been difficult to solve in the past, and the effects of the present invention can be effectively utilized.
The polymer having an alicyclic structure is a polymer having an alicyclic structure in a structural unit of the polymer. The polymer having an alicyclic structure may have an alicyclic structure in the main chain or may have an alicyclic structure in the side chain. Among them, a polymer having an alicyclic structure in the main chain is preferable from the viewpoints of mechanical strength and heat resistance.
Examples of the alicyclic structure include a saturated alicyclic hydrocarbon (cycloalkane) structure and an unsaturated alicyclic hydrocarbon (cycloalkene, cycloalkyne) structure. Among them, for example, a cycloalkane structure and a cycloalkene structure are preferable from the viewpoints of mechanical strength, heat resistance and the like, and a cycloalkane structure is particularly preferable.
The number of carbon atoms constituting the alicyclic structure is preferably 4 or more, more preferably 5 or more, still more preferably 30 or less, still more preferably 20 or less, and particularly preferably 15 or less per alicyclic structure. When the number of carbon atoms constituting the alicyclic structure is within this range, the resin film containing the polymer having the alicyclic structure is excellent in mechanical strength, heat resistance and moldability.
In the polymer having an alicyclic structure, the ratio of the structural units having an alicyclic structure can be appropriately selected according to the purpose of use. The proportion of the structural unit having an alicyclic structure in the polymer having an alicyclic structure is preferably 55% by weight or more, more preferably 70% by weight or more, and particularly preferably 90% by weight or more. When the ratio of the structural units having an alicyclic structure in the polymer having an alicyclic structure is within this range, the resin film containing the polymer having an alicyclic structure is excellent in transparency and heat resistance.
Among the polymers having an alicyclic structure, cycloolefin polymers are preferable. The cycloolefin polymer is a polymer having a structure obtained by polymerizing cycloolefin monomers. The cycloolefin monomer has a ring structure formed of carbon atoms, and the ring structure has a polymerizable carbon-carbon double bond. Examples of the polymerizable carbon-carbon double bond include polymerizable carbon-carbon double bonds that can be ring-opened polymerized and the like. Examples of the ring structure of the cycloolefin monomer include a single ring, a polycyclic ring, a condensed polycyclic ring, a bridged ring, and a polycyclic ring formed by combining these. Among them, polycyclic cycloolefin monomers are preferable from the viewpoint of highly balancing the dielectric characteristics and heat resistance characteristics of the polymer having an alicyclic structure.
Preferred cycloolefin polymers include norbornene polymers, monocyclic cycloolefin polymers, cyclic conjugated diene polymers, and hydrogenated products thereof. Among these, norbornene polymers are particularly preferable because of their good moldability.
Examples of the norbornene-based polymer include ring-opened polymers of monomers having a norbornene structure and hydrides thereof; addition polymers of monomers having norbornene structures and hydrides thereof. Examples of the ring-opening polymer of the monomer having a norbornene structure include a ring-opening homopolymer of one monomer having a norbornene structure, a ring-opening copolymer of two or more monomers having a norbornene structure, and a ring-opening copolymer of a monomer having a norbornene structure and another monomer copolymerizable therewith. Examples of the addition polymer of the monomer having a norbornene structure include an addition homopolymer of one monomer having a norbornene structure, an addition copolymer of two or more monomers having a norbornene structure, and an addition copolymer of a monomer having a norbornene structure and another monomer copolymerized therewith. Among these, the hydrogenated product of the ring-opening polymer of the monomer having a norbornene structure is suitable from the viewpoints of moldability, heat resistance, low hygroscopicity, dimensional stability, lightweight, and the like.
Examples of the monomer having a norbornene structure include bicyclo [2.2.1 ]]Hept-2-ene (common name: norbornene), tricyclo [4.3.0.1 ] 2,5 ]Dec-3, 7-diene (conventional name: dicyclopentadiene), 7, 8-benzotricyclo [4.3.0.1 ] 2,5 ]Dec-3-ene (commonplace name: methylene tetrahydrofluorene), tetracyclo [4.4.0.1 ] 2,5 .1 7,10 ]Dodec-3-ene (conventional name: tetracyclododecene), derivatives of these compounds (for example, those having a substituent in the ring), and the like. Here, examples of the substituent includeFor example, alkyl, alkylene, polar groups, and the like. And, these substituents may be the same or different, or may be bonded in plural in a ring. The monomer having a norbornene structure may be used alone or in combination of two or more kinds in any ratio.
Examples of the polar group include a heteroatom and an atomic group having a heteroatom. Examples of the hetero atom include an oxygen atom, a nitrogen atom, a sulfur atom, a silicon atom, and a halogen atom. Specific examples of the polar group include a carboxyl group, a carbonyl group, an oxycarbonyl group, an epoxy group, a hydroxyl group, an oxo group, an ester group, a silanol group, a silane group, an amine group, a nitro group, a sulfonic group, and the like.
Examples of the other monomer copolymerizable with the ring-opening of the monomer having a norbornene structure include monocyclic olefins such as cyclohexene, cycloheptene and cyclooctene, and derivatives thereof; cyclic conjugated dienes such as cyclohexadiene and cycloheptadiene, and derivatives thereof; etc. The other monomer copolymerizable with the ring-opening monomer having a norbornene structure may be used alone or in combination of two or more at an arbitrary ratio. The ring-opening polymer of the monomer having a norbornene structure can be produced, for example, by polymerizing or copolymerizing the monomer in the presence of a ring-opening polymerization catalyst.
Examples of the monomer which can be addition-copolymerized with the monomer having a norbornene structure include an α -olefin having 2 to 20 carbon atoms such as ethylene, propylene, 1-butene, and the like, and derivatives thereof; cycloolefins such as cyclobutene, cyclopentene and cyclohexene and derivatives thereof; non-conjugated dienes such as 1, 4-hexadiene, 4-methyl-1, 4-hexadiene, and 5-methyl-1, 4-hexadiene. Among these, α -olefins are preferred, and ethylene is more preferred. Further, the monomer that can be addition-copolymerized with the monomer having a norbornene structure may be used singly or in combination of two or more kinds in any ratio. The addition polymer of the monomer having a norbornene structure can be produced, for example, by polymerizing or copolymerizing the monomer in the presence of an addition polymerization catalyst.
The hydrogenated product of the ring-opening polymer and the addition polymer can be produced, for example, by hydrogenating carbon-carbon unsaturated bonds in a solution of the ring-opening polymer and the addition polymer by preferably 90% or more in the presence of a hydrogenation catalyst containing a transition metal such as nickel or palladium.
The norbornene polymer has, as a structural unit, X: bicyclo [3.3.0]2, 4-diyl-ethylene structure of oct-2, and Y: tricyclo [4.3.0.1 ] 2,5 ]The amount of the structural units of the deca-7, 9-diyl-ethylene structure relative to the whole structural units of the norbornene polymer is 90 wt% or more, and the ratio of X to the ratio of Y is represented by X: the weight ratio of Y is preferably 100:0 to 40:60. by using such a polymer, a resin film containing the norbornene polymer can be excellent in stability of optical characteristics without changing its long-term size.
Examples of the monocyclic cyclic olefin polymer include addition polymers of cycloolefin monomers having a single ring, such as cyclohexene, cycloheptene, and cyclooctene.
Examples of the cyclic conjugated diene polymer include a polymer obtained by cyclizing a conjugated diene addition polymer such as 1, 3-butadiene, isoprene, chloroprene, etc.; 1, 2-or 1, 4-addition polymers of cyclic conjugated diene monomers such as cyclopentadiene and cyclohexadiene; and hydrides thereof, etc.
The weight average molecular weight (Mw) of the polymer having an alicyclic structure is usually 30,000 or more, preferably 35,000 or more, more preferably 40,000 or more, preferably 80,000 or less, more preferably 60,000 or less, and particularly preferably 50,000 or less. When the weight average molecular weight (Mw) of the polymer having an alicyclic structure is equal to or greater than the lower limit of the above range, the adhesion between the optical film and the polarizer can be improved because the resin film can be effectively prevented from being broken by aggregation by the easy-to-bond layer. Further, by setting the upper limit value or less, the mechanical strength and molding processability of the resin film can be improved. Therefore, by limiting the weight average molecular weight (Mw) of the polymer having an alicyclic structure to the above range, the optical film can be excellent in cohesion, mechanical strength and molding processability.
The glass transition temperature (Tg) of the polymer having an alicyclic structure is preferably 100 ℃ or higher, more preferably 110 ℃ or higher, particularly preferably 120 ℃ or higher, preferably 190 ℃ or lower, more preferably 180 ℃ or lower, particularly preferably 170 ℃ or lower. By setting the glass transition temperature of the thermoplastic resin to the lower limit value or more of the above range, the durability of the resin film in a high-temperature environment can be improved. Further, by setting the upper limit value or less, the extension process can be easily performed.
The resin film may contain a resin component other than the polymer having an alicyclic structure within a range that does not hinder the effect of the present invention. Examples of the resin component other than the polymer having an alicyclic structure include cellulose-based resin, polyester-based resin, polyether sulfone-based resin, polycarbonate-based resin, polyamide-based resin, polyolefin-based resin, (meth) acrylic resin, polyarylate-based resin, polystyrene-based resin, and polyvinyl alcohol-based resin. These may be used singly or in combination of two or more. The content of the other resin component in the resin film is not particularly limited, but is preferably 0 to 50% by weight, more preferably 0 to 30% by weight, still more preferably 0 to 20% by weight.
The resin film may contain any additive or the like within a range that does not hinder the effects of the present invention. As the additive, for example, a colorant such as a pigment, a dye, or the like; a plasticizer; fluorescent whitening agents; a dispersing agent; a heat stabilizer; a light stabilizer; an ultraviolet absorber; an antistatic agent; an antioxidant; microparticles; surfactants, and the like. These may be used singly or in combination of two or more. The amount of the additive to be blended in the resin film is not particularly limited, but is preferably 0 to 5% by weight, more preferably 0 to 3% by weight, still more preferably 0 to 0.5% by weight.
The total light transmittance of the resin film in terms of 1mm thickness is preferably 80% or more, more preferably 90% or more. The total light transmittance can be measured according to JIS K0115 using a spectro-luminance meter (ultraviolet visible near infrared spectro-luminance meter "V-570" manufactured by Japanese spectro-Co.). The haze of the resin film in terms of 1mm thickness is preferably 0.3% or less, more preferably 0.2% or less. By limiting the haze to the above range, it is possible to prevent the elimination of polarized light when the optical film is attached to the polarizer. Haze can be measured according to JIS K7361-1997 using "nephelometer NDH-300A" manufactured by Nippon electric color industry Co.
The thickness of the resin film is preferably 5 μm or more, more preferably 8 μm or more, particularly preferably 10 μm or more, preferably 100 μm or less, more preferably 70 μm or less, particularly preferably 60 μm or less. By setting the thickness of the resin film to the lower limit value or more of the above range, the mechanical strength of the resin film can be improved. Further, the thickness of the resin film can be reduced by the upper limit value or less.
[ easy bonding layer ]
The easy-to-bond layer contains a polycarbonate-based polyurethane having a glass transition temperature (Tg) of 100 ℃ to 150 ℃ as a main component. The optical film of the present invention contains a polycarbonate-based polyurethane satisfying these characteristics as a main component, and thus has excellent adhesion to other components such as a polarizer even when it is a resin film containing a polymer having an alicyclic structure as a main component, which has been subjected to high elongation (elongation of 2.5 times or more). The reason for this is not clear, but it is considered that the polycarbonate-based polyurethane having a glass transition temperature (Tg) in the above range has a large proportion of hard segments (crystalline portions) contributing to adhesion and has high tensile strength (tensile force at which the material breaks due to stretching). Further, it is presumed that since the polar group such as a polycarbonate urethane carbonyl group occurs in a direction perpendicular to the polymer main chain, interaction with the polar group of the resin film containing the polymer having an alicyclic structure is easily obtained, and high adhesion can be ensured. Further, although the polyester-based polyurethane has a polar group such as a carbonyl group in the polymer, it is presumed that the polyester-based polyurethane has a hydrocarbon in the vicinity of the carbon with the carbonyl group and thus has a large volume, and interaction with the polar group of the resin film is not easily obtained as compared with the polycarbonate-based polyurethane.
The glass transition temperature (Tg) of the polycarbonate polyurethane is 100 ℃ to 150 ℃. The glass transition temperature (Tg) is preferably 115℃or more and 145℃or less, more preferably 125℃or more and 145℃or less, still more preferably 130℃or more and 140℃or less. When the glass transition temperature (Tg) is within the above range, the adhesive property with a resin film containing a polymer having an alicyclic structure as a main component, which is highly stretched (the stretching ratio is 2.5 times or more), is excellent, and the adhesive property with other components such as a polarizer is excellent.
The glass transition temperature (Tg) can be measured by conventional methods, for example, by dynamic viscoelasticity measurement. When the glass transition temperature (Tg) is measured by dynamic viscoelasticity measurement, for example, an aqueous dispersion of a polycarbonate-based polyurethane is prepared as 30% by weight of a solid, and the resultant is dispensed into a vessel such as a petri dish so that the film thickness of the polyurethane after drying is about 300. Mu.m, and the resultant is dried at room temperature for 15 hours, then dried at 80℃for 6 hours, and further dried at 120℃for 20 minutes, and the dynamic viscoelasticity is measured by using a dynamic viscoelasticity measuring apparatus (DMA 7100, manufactured by Hitachi Hibisci Ltd.), and the temperature at which the loss elastic modulus (E ") of dynamic viscoelasticity becomes extremely high can be set as the glass transition temperature (Tg).
The Young's modulus of the dried coating film of the polycarbonate-based polyurethane is preferably 570MPa to 1300 MPa. The Young's modulus is more preferably 580MPa to 1000MPa, still more preferably 590MPa to 850MPa, particularly preferably 600MPa to 800 MPa. When the young's modulus is in the above range, the adhesion to a resin film containing a polymer having an alicyclic structure as a main component, which is highly stretched (the stretching ratio is 2.5 times or more), is excellent, and the adhesion to other components such as a polarizer is excellent.
The young's modulus was measured by the following method. First, an aqueous dispersion of a polycarbonate-based polyurethane was prepared as a solid content of 30% by weight, and the resultant was dispensed into a vessel such as a petri dish so that the film thickness of the dried polyurethane resin became about 300 μm, and the vessel was dried at room temperature for 15 hours, then dried at 80℃for 6 hours, and further dried at 120℃for 20 minutes, to prepare a polyurethane film. Next, the polyurethane film was cut into a size of 15mm X180 mm, and after cutting out a sample, the sample was measured at a stretching speed of 5 mm/min and a distance between chucks of 50m in accordance with JIS K7127. The measurement temperature was 23 ℃.
The elongation at break of the dry coating of the polycarbonate-based polyurethane is preferably less than 300%. The elongation at break is more preferably less than 200%, still more preferably less than 100%, particularly preferably less than 50%. When the elongation at break of the polycarbonate-based polyurethane is in the above range, the polycarbonate-based polyurethane has excellent adhesion to a resin film containing a polymer having an alicyclic structure as a main component, which is highly stretched (the stretching ratio is 2.5 times or more), and also has excellent adhesion to other components such as a polarizer.
The elongation at break was measured by the following method. First, an aqueous dispersion of a polycarbonate-based polyurethane was prepared as a solid content of 30% by weight, and the resultant was dispensed into a vessel such as a petri dish so that the film thickness of the dried polyurethane resin became about 300 μm, and the vessel was dried at room temperature for 15 hours, then dried at 80℃for 6 hours, and further dried at 120℃for 20 minutes, to prepare a polyurethane film. Next, the polyurethane film was cut into a size of 15mm X180 mm, and after cutting out the sample, a sample was prepared in which mark points were recorded at 20mm intervals in the center. Then, the sample was mounted on a tensile tester, the gap between the chucks was set to 50mm, and the tensile speed was measured at a speed of 5 mm/min until the sample broke, and the sample was calculated by the following calculation method. The measurement temperature was 23 ℃.
Elongation at break (%) = ((distance between punctuations at break-distance between punctuations before test)/(distance between punctuations before test)) ×100
The polycarbonate-based polyurethane is a polyurethane having a carbonate skeleton in a molecular structure, and is obtained by reacting a polyisocyanate component having an average of two or more isocyanate groups in one molecule with a polycarbonate polyol component having an average of two or more hydroxyl groups in one molecule. The polycarbonate-based polyurethane is obtained, for example, by reacting a polyisocyanate with a polycarbonate polyol in an organic solvent which is inert to isocyanate and compatible with water to form an isocyanate-terminated prepolymer, and then, by reacting the prepolymer with a chain extender having a free carboxyl group to obtain a linear polyurethane prepolymer, and then, by subjecting the linear polyurethane prepolymer to chain extension with water in the presence of a neutralizing agent and simultaneously, to aqueous treatment. The term "aqueous" as used herein means that the resin is stably dispersed or emulsified in water. Further, the polycarbonate-based polyurethane preferably has a carboxyl group in a molecule, and thus has excellent adhesion to a resin film containing a polymer having an alicyclic structure as a main component, which is highly extended (extension ratio is 2.5 times or more), and also excellent adhesion to other components such as a polarizer.
As the polycarbonate polyol, there is used, examples are for example those of the formula HO-R- (O-C (O) -O-R) X-OH (wherein, in the method, in the process of the invention, R represents a saturated fatty acid polyol residue having 1 to 12 carbon atoms, and X represents a structural unit number of a molecule, usually an integer of 5 to 50). These polycarbonate polyols can be produced, for example, by transesterification by reacting a saturated aliphatic polyol with a substituted carbonate in excess of hydroxyl groups; a method of reacting a saturated aliphatic polyol with phosgene or, if necessary, subsequently reacting a saturated aliphatic polyol; and the like. In this case, for example, diethyl carbonate or diphenyl carbonate can be used as the substituted carbonate. In addition, one kind of these may be used alone, or two or more kinds of these may be used in any ratio.
Examples of the polyisocyanate include aliphatic polyisocyanate compounds, alicyclic polyisocyanate compounds, and aromatic polyisocyanate compounds each having two or more isocyanate groups in one molecule. As the aliphatic polyisocyanate compound, aliphatic diisocyanates having 1 to 12 carbon atoms, such as hexamethylene diisocyanate, 2, 4-trimethylhexane diisocyanate, hexane Diisocyanate (HDI) and the like, are preferable. The alicyclic polyisocyanate compound is preferably an alicyclic diisocyanate having 4 to 18 carbon atoms, and examples thereof include 1, 4-cyclohexane diisocyanate, methylcyclohexylene diisocyanate, isophorone diisocyanate (IPDI), dicyclohexylmethane diisocyanate (HMDI), and the like. As the aromatic polyisocyanate compound, preferred are aromatic diisocyanates, for example, toluene Diisocyanate (TDI), 4' -diphenylmethane diisocyanate, xylene diisocyanate, and the like. The polyisocyanate compound may be used alone or in combination of two or more kinds in any ratio.
Examples of the chain extender having a free carboxyl group include dihydroxycarboxylic acid and dihydroxysuccinic acid. Examples of the dihydroxycarboxylic acid include dihydroxyalkanoic acids such as dimethylol alkanoic acids (e.g., dimethylol acetic acid, dimethylol butyric acid, dimethylol propionic acid, dimethylol butyric acid, and dimethylol valeric acid). These may be used singly or in combination of two or more.
Examples of the neutralizing agent include ammonia, N-methylmorpholine, triethylamine, dimethylethanolamine, methyldiethanolamine, triethanolamine, morpholine, tripropylamine, ethanolamine, triisopropanolamine, 2-amino-2-methyl-1-propanol, and the like. These may be used singly or in combination of two or more.
Further, examples of the chain extender that can be used include low molecular weight diol compounds such as ethylene glycol, propylene glycol, 1, 4-butanediol, neopentyl glycol, furandimethanol, diethylene glycol, triethylene glycol, tetraethylene glycol, and polyether diol compounds such as ethylene oxide, propylene oxide, and tetrahydrofuran which are addition-polymerized thereto; polyester diols having hydroxyl groups at the terminal ends, which are obtained by reacting the low-molecular-weight diol compound with dicarboxylic acids such as succinic acid (anhydride), adipic acid (adipic acid), and phthalic acid (anhydride); polyhydric alcohols such as trimethylolethane and trimethylolpropane; amino alcohols such as monoethanolamine, diethanolamine and triethanolamine; diamine compounds such as ethylenediamine, propylenediamine, butylenediamine, hexamethylenediamine, phenylenediamine, toluenediamine, xylylenediamine, isophoronediamine, and the like; water, ammonia, diamine, dibasic acid diamine, etc. These may be used singly or in combination of two or more.
The acid value of the polycarbonate-based polyurethane is not particularly limited, but is preferably 25mgKOH/g or less, for example. The acid value is more preferably 5mgKOH/g or more and 20mgKOH/g or less, still more preferably 10mgKOH/g or more and 20mgKOH/g or less. When the acid value is in the above range, the adhesive property with a resin film containing a polymer having an alicyclic structure as a main component, which is highly stretched (stretching ratio is 2.5 times or more), is excellent, and the adhesive property with other components such as a polarizer is excellent.
The number average molecular weight of the polycarbonate-based polyurethane is not particularly limited, and is preferably 5,000 to 1,000,000, for example. The number average molecular weight is more preferably 10,000 to 600,000, still more preferably 30,000 to 400,000. When the number average molecular weight is within the above range, the adhesion to a resin film containing a polymer having an alicyclic structure as a main component, which is highly stretched (stretching ratio is 2.5 times or more), is excellent, and the adhesion to other components such as a polarizer is excellent.
The easy-to-bond layer may contain a resin component other than the polycarbonate-based polyurethane as long as the effects of the present invention are not impaired. Examples of the resin component other than the polycarbonate-based polyurethane include a polyurethane obtained by reacting a polyisocyanate component with a polyester polyol component, a polyurethane obtained by reacting a polyisocyanate component with a polyether-ester polyol component, a polyurethane obtained by reacting a polyisocyanate component with a polyacrylic polyol component, a polyolefin, a polyester, and an acrylic polymer. These may be used singly or in combination of two or more.
The easy-to-bond layer may contain a crosslinking agent in order to improve the wet heat resistance under high temperature and high humidity. As the crosslinking agent, any suitable crosslinking agent may be used, and examples thereof include urea compounds, epoxy compounds, melamine compounds, isocyanate compounds, oxazoline compounds, silanol compounds, carbodiimide compounds, and the like. These may be used singly or in combination of two or more.
The content of the crosslinking agent is preferably 0.1 to 15 parts by weight in terms of solid content relative to 100 parts by weight of the total of the polycarbonate-based polyurethane. More preferably 0.3 to 5 parts by weight, still more preferably 0.5 to 3 parts by weight. When the resin component other than the polycarbonate-based polyurethane is contained, the crosslinking agent may be blended with respect to 100 parts by weight of the solid component containing the other resin component.
The bondable layer may also contain any suitable microparticles in combination with the function. Further, fine particles having water dispersibility are preferable. Examples of the fine particles include inorganic fine particles such as inorganic oxides of silicon oxide, titanium oxide, aluminum oxide, and zirconium oxide, calcium carbonate, talc, clay, calcined kaolin, calcined calcium silicate, hydrated calcium silicate, aluminum silicate, magnesium silicate, and calcium phosphate. Examples of the organic fine particles include silicone resins, fluorine resins, (meth) acrylic resins, and (meth) acrylonitrile resins. Among these, silicon oxide is preferable. The silicon oxide fine particles have excellent adhesion inhibition ability, excellent transparency, no haze and no coloration, and therefore the easily bonded layer has less influence on optical characteristics.
The average particle diameter of the fine particles is not particularly limited, but is preferably 1 to 500nm, more preferably 50 to 350nm, still more preferably 100 to 300nm, from the viewpoint of maintaining the transparency of the easy-to-bond layer. By using fine particles having such a particle diameter, appropriate irregularities are formed on the surface of the easy-to-bond layer, so that the friction force between the resin film and the easy-to-bond layer and/or the contact surface between the easy-to-bond layer can be effectively reduced, and adhesion can be suppressed.
The content of the fine particles is preferably 0.1 to 15 parts by weight in terms of solid content relative to 100 parts by weight of the total of the polycarbonate-based polyurethane. More preferably 0.3 to 5 parts by weight, still more preferably 0.5 to 3 parts by weight. When the resin component other than polycarbonate polyurethane is contained, fine particles may be blended with respect to 100 parts by weight of the solid component containing the other resin component.
The easy-to-bond layer may further comprise any suitable additive. Examples of the additives include dispersion stabilizers, shaking agents, antioxidants, ultraviolet absorbers, antifoaming agents, tackifiers, dispersants, surfactants, catalysts, slip agents, antistatic agents, and the like.
The thickness of the easily-bonding layer is not particularly limited, and is preferably, for example, 0.05 μm or more and 10 μm or less, more preferably 0.1 μm or more and 5 μm or less, still more preferably 0.2 μm or more and 3 μm or less, and particularly preferably 0.3 μm or more and 1.5 μm or less. By setting the thickness of the joining-facilitating layer to the above range, the adhesion can be effectively improved.
[ optical film ]
Fig. 1 shows an example of the optical film of the present invention. The optical film 1 shown in fig. 1 has an easy-to-bond layer 3 containing polycarbonate polyurethane as a main component on one surface of a resin film 2 containing a polymer having an alicyclic structure as a main component. The specific configuration of the resin film 2 and the bondable layer 3 is as described above. The bonding layer 3 may be formed on at least one surface of the resin film 2, or may be formed on both surfaces of the resin film 2.
From the viewpoint of stably functioning as an optical member, the total light transmittance of the optical film is preferably 85% or more, more preferably 90% or more. The light transmittance can be measured by using a spectroluminance meter (ultraviolet visible near infrared spectroluminance meter "V-570" manufactured by Japanese spectroscope) in accordance with JIS K0115.
The haze of the optical film is not particularly limited, but is preferably 1.0% or less, more preferably 0.8% or less, still more preferably 0.5% or less. Haze can be measured according to JIS K7361-1997 using "nephelometer NDH-300A" manufactured by Nippon electric color industry Co.
The in-plane retardation Re and the retardation Rth in the thickness direction of the optical film can be arbitrarily set according to the use of the optical film. The specific in-plane retardation Re is preferably in the range of 50nm to 200 nm. And the specific thickness direction retardation Rth is preferably 50nm to 300 nm.
The optical film preferably has a peel strength of 2.0N/25mm or more between the stretched film and the easy-to-bond layer. The peel strength is more preferably 2.5N/25mm or more, still more preferably 3.0N/25mm or more. When the peel strength is in the above range, since the optical film is bonded to other components such as a polarizer with high peel strength, when a polarizing plate or the like formed by bonding the optical film to the polarizer via the adhesive is assembled to a touch panel in practical use, defects such as peeling of the optical film from the polarizer can be suppressed.
The peel strength can be measured by the following method. First, a polyvinyl alcohol adhesive composition (Gosenex (trademark) Z-200, mitsubishi chemical corporation) was applied to the easy-to-bond layer side of the optical film, and the adhesive composition was laminated with an iodine polarizer having a thickness of 60 μm, and then dried in a hot air dryer (80 ℃) for 10 minutes to prepare a laminate bonded to the polarizer. Next, a sample piece having a size of 25mm×250mm was cut out from the laminate, and the surface of the optical film was subjected to an adhesion process and attached to a glass plate. Then, the polarizer of the laminate was nipped, and the peel strength at 90 degrees was measured according to the dancer method of Japanese cement industry standard JAI 13-1996.
The total thickness of the optical film is preferably 8 μm or more, more preferably 9 μm or more, particularly preferably 10 μm or more, preferably 250 μm or less, more preferably 200 μm or less, particularly preferably 150 μm or less. By setting the total thickness of the optical film to the lower limit value or more of the above range, the mechanical strength of the optical film can be improved. Further, by setting the upper limit value or less, the entire thickness of the optical film can be reduced.
In the optical film of the present invention, various functional layers can be formed on the surface opposite to the surface on which the easy-to-bond layer is formed, as required. Examples of the functional layer include an antistatic layer, an adhesive layer, a bonding layer, an easy-to-bond layer, an antiglare (non-glare) layer, an antifouling layer such as a photocatalyst layer, an antireflection layer, a hard coat layer, an ultraviolet shielding layer, a heat ray shielding layer, an electromagnetic wave shielding layer, a gas barrier layer, and the like.
The optical film of the present invention is, for example, a polarizer protective film, a retardation film, a viewing angle compensation film, a light diffusion film, a reflection film, an antireflection film, an antiglare film, a brightness enhancement film, a conductive film for a touch panel. The optical film of the present invention may be an optically isotropic film, or may be a film having optical anisotropy (e.g., exhibiting birefringence such as retardation).
[ method for producing optical film ]
The method for producing an optical film of the present invention comprises the steps of: a step of forming a coating film by applying a coating liquid containing an aqueous solvent and a polycarbonate-based polyurethane having a glass transition temperature (Tg) of 100 ℃ to 150 ℃ inclusive to at least one surface of a resin film containing a polymer having an alicyclic structure as a main component; and a step of forming an easy-to-bond layer by drying or hardening the coating film. Among them, the production is preferably performed by the following first production method or second production method.
[ first manufacturing method ]
The first production method of an optical film according to the present invention preferably includes the steps of: a step of forming a coating film by applying a coating liquid containing an aqueous solvent and a polycarbonate-based polyurethane having a glass transition temperature (Tg) of 100 ℃ to 150 ℃ inclusive to at least one surface of a resin film before stretching, the resin film being composed of a thermoplastic resin containing a polymer having an alicyclic structure as a main component; a step of forming an easy-to-bond layer by drying or hardening the coating film; and a step of stretching the resin film before stretching to obtain a stretched film.
In the first method for producing an optical film of the present invention, a step of preparing a resin film before stretching is performed. The resin film before stretching is a green sheet film which is stretched by a stretching treatment and is made of a thermoplastic resin containing a polymer having an alicyclic structure as a main component.
The method of producing the resin film before stretching from the thermoplastic resin is not limited. For example, the thermoplastic resin may be molded into a film by a melt molding method, a solution casting method, or the like to produce a resin film before stretching. Examples of the melt molding method include extrusion molding by melt extrusion molding, and compression molding, injection molding, blow molding, and extension molding. Among these methods, extrusion molding is preferred from the viewpoint of obtaining a resin film before stretching that is excellent in mechanical strength and surface accuracy.
In order to improve the adhesion between the resin film and the easy-to-bond layer, the surface of the resin film before the extension of the coating film is formed may be subjected to a surface modifying treatment. The surface modification treatment generally increases the hydrophilicity of the treated surface so that the average water contact angle and the standard deviation of the water contact angle of the surface are within a desired range. The desired average water contact angle is preferably in the range of 20 ° to 80 °, more preferably 20 ° to 75 °, still more preferably 20 ° to 50 °. The standard deviation of the required water contact angle is preferably in the range of 0.01 ° to 5 °. Examples of the surface modification treatment include, for example, an energy ray irradiation treatment and a reagent treatment. Examples of the energy ray irradiation treatment include corona discharge treatment, plasma treatment, electron beam irradiation treatment, and ultraviolet irradiation treatment, and corona discharge treatment and plasma treatment are preferable in terms of treatment efficiency, and corona discharge treatment is particularly preferable. And as the reagent treatment, for example, saponification treatment, treatment in which the film is immersed in an aqueous solution of an oxidizing agent such as a potassium hydrogen chromate solution and concentrated sulfuric acid, followed by washing with water, and the like are exemplified.
In the first production method, a step of forming a coating film by applying a coating liquid containing an aqueous solvent and a polycarbonate-based polyurethane having a glass transition temperature (Tg) of 100 ℃ to 150 ℃ on at least one surface of a resin film before stretching is performed. The method of forming the coating film on the resin film before stretching is not particularly limited, and examples of the coating method include a wire bar coating method, a dipping method, a spraying method, a spin coating method, a roll coating method, a gravure coating method, an air knife coating method, a curtain coating method, a slide coating method, an extrusion coating method, and the like.
The first production method includes a step of forming an easy-to-bond layer by drying or curing a coating film on a surface of a resin film before stretching. The coating film is usually cured by drying the solvent contained in the coating liquid. In this case, the heat treatment is preferably performed in view of rapid reaction such as crosslinking reaction in the coating film. The heating temperature and heating time may be appropriately set in a range in which a desired reaction such as a processing reaction is performed.
In the first manufacturing method, after forming the easy-to-bond layer on the surface of the resin film before stretching, a step of stretching the resin film before stretching to obtain a stretched film is performed. Examples of the stretching method include a method of uniaxial stretching in the longitudinal direction by using a peripheral speed difference between rolls (longitudinal uniaxial stretching); a method of monoaxially stretching in the width direction using a tenter (transverse monoaxially stretching); a method of sequentially performing longitudinal uniaxial extension and transverse uniaxial extension (sequential biaxial extension); a method of simultaneously performing longitudinal extension and transverse extension (simultaneous biaxial extension); a method of extending obliquely (obliquely extending) with respect to the longitudinal direction of the film before extending; etc. Here, "oblique" means a direction which is not parallel nor perpendicular to the longitudinal direction of the film before extension.
The resin film temperature at the time of stretching is preferably Tg or higher, more preferably tg+5 ℃ or higher, particularly preferably tg+8 ℃ or higher, preferably tg+35 ℃ or lower, more preferably tg+30 ℃ or lower, particularly preferably tg+25 ℃ or lower, based on the glass transition temperature (Tg) of the thermoplastic resin forming the stretched film. When the temperature of the resin film during stretching is not less than the lower limit of the above range, excessive retardation in the stretched film can be prevented, and the adhesion of the interface between the stretched film layer and the easily-bonded layer can be optimized. Further, by setting the film thickness accuracy of the extension film layer to be equal to or lower than the upper limit value, the film thickness accuracy of the extension film layer can be optimized, and uniform retardation can be stably exhibited over the entire surface of the extension film.
The stretching ratio at the time of stretching is preferably 1.5 times or more, more preferably 2.5 times or more, particularly preferably 4.0 times or more, preferably 10.0 times or less, more preferably 7.0 times or less, particularly preferably 5.0 times or less. Here, when the stretching is performed in two or more steps, the product of the stretching ratios of the respective steps is preferably limited to the above range. By setting the stretching ratio to the lower limit value or more of the above range, the film thickness accuracy of the stretched film can be improved. Thus, the extended film exhibits uniform retardation over the entire surface. Further, since the thickness of the joining-facilitating layer can be reduced, the adhesion of the optical film can be reduced in-plane unevenness.
In the first production method, the step of drying or curing the coating film to obtain the easily-bonded layer and the step of stretching the resin film before stretching to obtain the stretched film may be performed either or both of the steps. From the viewpoint of improving the adhesion between the stretched film and the easy-to-bond layer, it is preferable to simultaneously perform the step of drying or curing the coating film to obtain the easy-to-bond layer and the step of stretching the resin film before stretching to obtain the stretched film. In the case of performing the two steps simultaneously, the coating film is heated by heat applied during the stretching of the resin film before the stretching, and the coating liquid layer is usually dried or cured. By performing the above steps, an optical film including an extension film and an easily-bonded layer provided on at least one surface of the extension film is obtained.
From the viewpoint of improving the production efficiency of the optical film, the optical film is preferably produced as a long film. When producing an optical film as a long film, it is preferable to prepare a long resin film before stretching, and to continuously form an easy-to-bond layer by applying a coating liquid containing a polycarbonate-based polyurethane to the surface of the resin film before stretching and drying or curing the coating liquid while conveying the resin film before stretching in the longitudinal direction. For example, before the continuous long resin film before the stretching is supplied to the stretching device, the coating liquid is preferably applied to the surface of the resin film before the stretching, and the drying of the coating film and the stretching of the resin film before the stretching are performed simultaneously in the preheating region and the stretching region of the stretching device.
[ second manufacturing method ]
The second method for producing an optical film according to the present invention preferably comprises the steps of: a step of forming a coating film by applying a coating liquid containing an aqueous solvent and a polycarbonate-based polyurethane having a glass transition temperature (Tg) of 100 ℃ to 150 ℃ inclusive to at least one surface of an extended film made of a thermoplastic resin containing a polymer having an alicyclic structure as a main component; and a step of forming an easy-to-bond layer by drying or hardening the coating film.
In the second method for producing an optical film of the present invention, a step of preparing an extended film is performed. The stretched film can be produced by a production method comprising a step of preparing a resin film before stretching and a step of stretching the prepared resin film before stretching, as described in the first production method. The surface modification treatment may be performed on the surface of the extension film on which the coating film is formed in order to improve adhesion between the extension film and the easily-bonded layer.
Next, a step of forming a coating film by applying a coating liquid containing an aqueous solvent and a polycarbonate-based polyurethane having a glass transition temperature (Tg) of 100 ℃ to 150 ℃ to at least one surface of the stretched film is performed. As the coating method, the above-mentioned coating method can be used.
Subsequently, the coating liquid layer formed on the surface of the stretched film is dried or cured to obtain an easy-to-bond layer. In this case, the solvent contained in the coating liquid is usually dried to harden the coating film. In this hardening, a heat treatment is preferably performed. However, in the second manufacturing method, the coating film is formed on the surface of the stretched film having a retardation exhibited by stretching. Therefore, the temperature at which the joining-easy layer is cured is preferably set within a range in which the retardation of the stretched film is not changed. Specifically, the temperature at which the coating film is dried or cured is preferably (Tg-50 ℃) or higher, more preferably (Tg-40 ℃) or higher, preferably (Tg+20 ℃) or lower, and even more preferably (Tg+10 ℃) or lower, based on the glass transition temperature Tg of the thermoplastic resin contained in the stretched film. By setting the temperature to this constant temperature, the recipe relaxation of the stretched film can be suppressed, and thus the change in retardation can be suppressed.
By performing the above steps, an optical film having an extension film and an easy-to-bond layer provided on at least one surface of the extension film is obtained. In the second manufacturing method, the optical film is preferably manufactured as a long film from the viewpoint of improving the manufacturing efficiency of the optical film, as in the first manufacturing method.
[ polarizing plate ]
Next, as an example of the optical member of the present invention, a polarizing plate will be described. Fig. 2 shows a polarizing plate which is an example of the optical member of the present invention. The polarizing plate 10 shown in fig. 2 has a structure in which a polarizer 6 is laminated via an adhesive 5 on one surface of a resin film 2 containing a polymer having an alicyclic structure as a main component, the surface having an easy-to-bond layer side of an optical film 4 containing a polycarbonate-based polyurethane as a main component, and the easy-to-bond layer side of the optical film 3. Although not shown, the polarizing plate may have another polarizer protective film, a retardation film, or the like laminated via an adhesive layer on the side opposite to the optical film of the polarizer.
The polarizing plate has a structure in which a polarizer is laminated via an adhesive layer on the surface of an easy-to-bond layer of an optical film having the easy-to-bond layer on the surface of a resin film containing a polymer having an alicyclic structure. The easy-to-bond layer formed on the optical film is excellent in strength and bonding property, and therefore can be a polarizing plate excellent in adhesion between the polarizer and the optical film.
Any suitable polarizer may be used as the polarizer depending on the application. For example, a hydrophilic polymer film such as a polyvinyl alcohol film, a partially formalized polyvinyl alcohol film or an ethylene-vinyl acetate copolymer partially saponified film, a polyolefin alignment film such as a dehydrated polyvinyl alcohol product or a desalted polyvinyl chloride product, which is obtained by uniaxially stretching a dichroic substance such as iodine or a dichroic dye, or the like, by adsorbing the dichroic substance onto the hydrophilic polymer film. Among these, a polarizer in which a dichroic substance such as iodine is adsorbed to a polyvinyl alcohol film and uniaxially stretched is particularly preferable because of relatively high polarization dichroism. The thickness of these polarizers is not particularly limited, but is generally about 1 to 80 μm.
As the bonding agent for forming the bonding agent layer, any suitable bonding agent may be used. Preferably, the adhesive layer is formed of an adhesive composition containing a polyvinyl alcohol resin.
[ image display device ]
The image display device of the present invention is provided with the polarizing plate of the present invention. Specific examples of the image display device include a self-luminous display device such as an Electroluminescence (EL) display, a Plasma Display (PD), a field emission display (FED: field Emission Display), a liquid crystal display device (LCD), and the like. A Liquid Crystal Display (LCD) device has a liquid crystal cell and the polarizing plate disposed on at least one side of the liquid crystal cell.
Examples
The present invention will be described in more detail by way of examples. And the present invention is not limited to the following examples.
The following materials were used. The characteristic values of the water-dispersible urethane resin, glass transition temperature and young's modulus are shown in table 1.
< Water-dispersible urethane resin >
Emulsion of Water-dispersible urethane resin (1) [ polycarbonate-based polyurethane, solid content 30 wt.% ]
Emulsion of Water-dispersible urethane resin (2) [ polycarbonate-based polyurethane, SUPERFLEX (registered trademark) 420, manufactured by first Industrial pharmaceutical Co., ltd., solid content 32% by weight ]
Emulsion of Water-dispersible urethane resin (3) [ polycarbonate-based polyurethane, SUPERFLEX (registered trademark) 420NS, manufactured by first Industrial pharmaceutical Co., ltd., solid content 32 wt.%)
Emulsion of Water-dispersible urethane resin (4) [ polycarbonate-series polyurethane, SUPERFLEX (registered trademark) 460, manufactured by first Industrial pharmaceutical Co., ltd., solid content 38% by weight ]
Emulsion of Water-dispersible urethane resin (5) [ polycarbonate-based polyurethane, manufactured by first Industrial pharmaceutical Co., ltd., SUPERFLEX (registered trademark) 460NS, solid content 38% by weight ]
Emulsion of Water-dispersible urethane resin (6) [ polycarbonate-based polyurethane, SUPERFLEX (registered trademark) 470, manufactured by first Industrial pharmaceutical Co., ltd., solid content 38% by weight ]
Emulsion of Water-dispersible urethane resin (7) [ polyester-based polyurethane, SUPERFLEX (registered trademark) 210, manufactured by first Industrial pharmaceutical Co., ltd., solid content 35% by weight ]
Emulsion of Water-dispersible urethane resin (8) [ polyether-based polyurethane, SUPERFLEX (registered trademark) 870, manufactured by first Industrial pharmaceutical Co., ltd., solid content 30% by weight ]
[ Table 1 ]
| Resin composition | Glass transition temperature (. Degree. C.) | Young's modulus (MPa) |
| Water-dispersible carbamates (1) | 137 | 600 |
| Water-dispersible carbamates (2) | -10 | 565 |
| Water-dispersible carbamates (3) | -10 | 565 |
| Water-dispersible carbamates (4) | -21 | 8.5 |
| Water-dispersible carbamates (5) | -28 | 10.8 |
| Water-dispersible carbamates (6) | -31 | 13 |
| Water-dispersible carbamates (7) | 41 | 1396 |
| Water-dispersible carbamates (8) | 78 | 1486 |
(production of easy-to-join composition)
The components shown in table 1 were prepared into compositions (1) to (8) having a solid content of 8 wt% by using ion-exchanged water.
Example 1
At cycloolefin film A [ glass transition temperature: 120 ℃, thickness: 115 μm ], the above-obtained composition (1) was applied to one surface by a bar coater, and then the resultant was dried at 100℃for 90 seconds by a hot air dryer to prepare an optical film having an easy-to-bond layer having a thickness of 0.3 μm on the surface of the cycloolefin film A having a thickness of 115. Mu.m.
Example 2
Cycloolefin film A [ glass transition temperature: 120 ℃, thickness: 115 μm was uniaxially stretched using a bench stretcher at the stretching ratio shown in Table 2 to prepare an stretched film, one surface of which was coated with the obtained composition (1) and then dried at 100℃for 90 seconds by a hot air dryer to prepare an optical film having an easy-to-bond layer with a thickness of 0.3 μm on the surface of the stretched cycloolefin film.
Example 3 and 4
Except for cycloolefin film A [ glass transition temperature: 120 ℃, thickness: an optical film was produced under the same conditions as in example 2 except that the draw ratio of 115 μm was changed to the draw ratio shown in Table 2.
Example 5
Except for using cycloolefin film B [ glass transition temperature: 135 ℃, thickness: an optical film was produced under the same conditions as in example 2 except that the draw ratio was changed to 125 μm as shown in Table 2.
Comparative examples 1 to 7
An optical film was produced under the same conditions as in example 4, except that the composition shown in table 2 was changed to the composition for easy bonding.
Comparative example 8
An optical film was produced under the same conditions as in example 1, except that the composition shown in table 2 was changed to the composition for easy bonding.
The optical films obtained in examples, comparative examples and reference examples were evaluated as follows. The evaluation results are shown in Table 2.
(peel Strength)
On the side of the easy-to-bond layer of the optical films obtained in each of examples and comparative examples, a polyvinyl alcohol-based adhesive composition (Gosenex (trademark) Z-200, manufactured by Mitsubishi chemical corporation) was applied, and the laminate was laminated with an iodine-based polarizer having a thickness of 60 μm via the adhesive composition, and then dried in a hot air dryer (80 ℃) for 10 minutes, to obtain a laminate bonded to the polarizer. From the laminate obtained above, a sample piece having a size of 25mm×250mm was cut, and the surface of the optical film was subjected to an adhesion process and attached to a glass plate. Subsequently, the polarizer of the laminate was nipped, and the peel strength at 90 degrees was measured according to the dancer method of Japanese cement industry standard JAI 13-1996. In addition, the unit of peel strength was expressed as (N/25 mm).
[ Table 2 ]
As shown in table 2, the optical films of examples 1 to 5 having the polycarbonate-based polyurethane as a main component, which had a glass transition temperature (Tg) of 100 ℃ or more and 150 ℃ or less, on the cycloolefin film showed excellent adhesion to the easy-to-bond layer and excellent peel strength to the polarizer. The optical films of examples 2 to 5 were each composed of an easy-to-bond layer containing a polycarbonate-based polyurethane having a glass transition temperature (Tg) of 100 ℃ or more and 150 ℃ or less as a main component, and showed the results that the adhesion to the easy-to-bond layer was excellent and the peel strength to the polarizer was excellent even in the case of a cycloolefin film having a high elongation. On the other hand, the optical films of comparative examples 1 to 7 having the easy-to-bond layer containing polyurethane having a glass transition temperature (Tg) of less than 100 ℃ as a main component showed insufficient adhesion between the cycloolefin film and the easy-to-bond layer and insufficient peel strength from the polarizer. In comparative examples 7 and 8, the substrates were the difference between the stretched cycloolefin film and the non-stretched cycloolefin film, but the stretched cycloolefin film showed poor adhesion to the easily-bonded layer.
Description of the reference numerals
1: an optical film; 2: a resin film; 3: an easy-to-bond layer; 4: an optical film; 5: a cement layer; 6: a polarizer; 10: a polarizing plate.
Claims (10)
1. An optical film comprising a resin film and an easy-to-bond layer, wherein the resin film contains a polymer having an alicyclic structure as a main component, the easy-to-bond layer is laminated on one surface of the resin film, the easy-to-bond layer comprises a polycarbonate-based polyurethane as a main component, and the polycarbonate-based polyurethane has a glass transition temperature (Tg) of 100 ℃ to 150 ℃.
2. The optical film of claim 1, wherein the resin film is an extended film.
3. The optical film according to claim 2, wherein the stretch ratio of the stretch film is up to 2.5 times or more in terms of area ratio.
4. The optical film according to any one of claims 1 to 3, wherein the polycarbonate-based polyurethane has a young's modulus of 570MPa or more and 1300MPa or less.
5. The optical film of any of claims 1-4, wherein the polycarbonate-based polyurethane has an elongation at break of less than 300%.
6. The optical film according to any one of claims 1 to 5, wherein the polycarbonate-based polyurethane has an acid value of 25mgKOH/g or less.
7. The optical film according to any one of claims 1 to 6, wherein the peel strength of the resin film of the polycarbonate-based polyurethane and the easy-to-bond layer is 2.0N/25mm or more.
8. The polarizing plate according to any one of claims 1 to 7, wherein the optical film, the adhesive layer, and the polarizer are sequentially laminated so that the easy-to-bond layer is in contact with the adhesive layer.
9. An image display apparatus provided with the polarizing plate according to claim 8.
10. A method for producing an optical film, characterized by comprising the steps of: a step of forming a coating film by applying a coating liquid containing an aqueous solvent and a polycarbonate-based polyurethane having a glass transition temperature (Tg) of 100 ℃ to 150 ℃ inclusive to at least one surface of a resin film containing a polymer having an alicyclic structure as a main component; and a step of forming an easy-to-bond layer by drying the coating film.
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| JP2017015743A (en) * | 2013-11-14 | 2017-01-19 | 株式会社トクヤマ | Primer composition for optical article, and photochromic laminate containing cured body of the primer composition for optical article |
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