WO2004088370A1 - 偏光板保護フィルム、その製造方法、反射防止機能付偏光板及び光学製品 - Google Patents
偏光板保護フィルム、その製造方法、反射防止機能付偏光板及び光学製品 Download PDFInfo
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- WO2004088370A1 WO2004088370A1 PCT/JP2004/004241 JP2004004241W WO2004088370A1 WO 2004088370 A1 WO2004088370 A1 WO 2004088370A1 JP 2004004241 W JP2004004241 W JP 2004004241W WO 2004088370 A1 WO2004088370 A1 WO 2004088370A1
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- film
- polarizing plate
- layer
- protective film
- plate protective
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Classifications
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- 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
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- G02B1/105—
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/11—Anti-reflection coatings
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/11—Anti-reflection coatings
- G02B1/113—Anti-reflection coatings using inorganic layer materials only
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/14—Protective coatings, e.g. hard coatings
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
- G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
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- 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
- G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
- G02F2201/38—Anti-reflection arrangements
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- 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
- G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
- G02F2201/50—Protective arrangements
Definitions
- the present invention relates to a polarizing plate protective film in which an antireflection layer is laminated on a base film made of a resin having a small warpage, a small photoelastic coefficient and a low water absorption even under high temperature and high humidity conditions, and a method for producing the same.
- the present invention relates to a polarizing plate having a bright and anti-reflection function, and an optical product provided with the polarizing plate.
- liquid crystal display devices have been widely used as display devices for desktop computers, electronic clocks, personal computers, and card processors.
- a liquid crystal display device usually has a liquid crystal cell configured by enclosing and sealing liquid crystal between two substrates, and a polarizing plate is provided on the surface of the liquid crystal cell, and a reflective plate is provided on the back surface of the liquid crystal cell. It has a structure in which a polarizing plate with an anti-reflection function, on which an anti-reflection layer is laminated, is bonded via an adhesive.
- the liquid crystal display device is warped, deformed, or distorted due to expansion and contraction due to a change in temperature and humidity of the polarizing plate bonded to the front and back of the liquid crystal cell. Occurs, and the whole is deformed into a propeller-like or irregular shape, which hinders the performance of the display device itself, and it is difficult to obtain a display device that exhibits stable display performance over a long period of time. Was.
- a polarizing plate having an anti-reflection function is formed on a transparent synthetic resin film by an anti-reflection layer, a PVD (physical vapor deposition) method, a CVD (chemical vapor deposition) method, or the like. This is manufactured by laminating this on a polarizing plate.
- the present invention has been made in view of the circumstances of the related art, and has a structure in which warping, deformation, distortion, and the like are unlikely to occur even in a high-temperature, high-humidity environment for a long time. It is an object of the present invention to provide a polarizing plate protective film and a method for producing the same, a polarizing plate with an antireflection function, and an optical product provided with the polarizing plate. Disclosure of the invention
- the present inventors have conducted intensive studies on a polarizing plate protective film having an antireflection layer on at least one surface of a base film made of a resin material in order to solve the above-mentioned problems. Even if the saturated water absorption is lower than the specified value and the film is made of a resin material with little warping even if it is left under high temperature and high humidity for a long time, the entire liquid crystal display may be warped.
- the present inventors have found that a polarizing plate protective film having a structure that does not easily cause deformation, distortion, and the like can be obtained, and have completed the present invention.
- a polarizing plate protective film is formed by laminating an antireflection layer directly or through another layer on at least one surface of a base material film made of a resin material.
- a polarizing plate protective film having a content of 1% or less.
- the resin material preferably contains an alicyclic structure-containing polymer resin.
- the antireflection layer is preferably a single-layer film of inorganic oxide or a multilayer film of two or more layers.
- a polarizing plate having a step of forming an antireflection layer on the surface of a substrate film made of a resin material or on the surface of the other layer of the substrate film on which another layer is formed
- the present invention provides a method for producing a polarizing plate protective film of the present invention, which is formed.
- the step of forming the antireflection layer may include the step of forming the antireflection layer on the surface of the substrate film or on the other layer of the substrate film having another layer formed on the surface.
- An anti-reflection layer is formed by sequentially laminating a plurality of inorganic oxide thin films on the surface of the substrate, wherein the substrate film or the substrate film on which the other layer is formed on the surface is formed of an inorganic material.
- a plurality of film forming chambers each having a film forming means for forming an oxide thin film are sequentially passed through, and the film forming means of each film forming chamber forms a substrate on the surface of the base film or on which the other layer is formed.
- a step of sequentially laminating a plurality of inorganic oxide thin films on the surface of the other layer of the material film is performed.
- Construction Preferably a film made of a resin material containing organic polymer resins.
- a polarizing plate is laminated on one surface of the base film of the polarizing plate protective film of the present invention on which the antireflection layer is not provided. A polarizing plate with an antireflection function is provided.
- an optical product comprising the polarizing plate with an antireflection function of the present invention.
- FIG. 1 is a view showing a method for measuring a warp rate of a resin material constituting a base film.
- FIG. 2 is a conceptual diagram of continuously producing the polarizing plate protective film of the present invention using a film forming apparatus.
- FIG. 3 is a schematic view showing another embodiment of an apparatus for forming an anti-reflection layer.
- FIG. 4 is a sectional view of a layer structure of the polarizing plate protective film of the present invention.
- FIG. 5 is a sectional view of a layer structure of a polarizing plate with an antireflection function of the present invention.
- FIG. 6 is a sectional view of a layer structure in which a polarizing plate with an antireflection function of the present invention is bonded to a liquid crystal display cell.
- FIG. 5 is a sectional view of a layer structure of the liquid crystal display cell shown in FIG. BEST MODE FOR CARRYING OUT THE INVENTION
- the polarizing plate protective film of the present invention is a polarizing plate protective film in which an antireflection layer is laminated directly or via another layer on at least one surface of a base material film made of a resin material.
- a film satisfying the following requirements (a) to (d) is used as the base film.
- the saturated water absorption is less than 0.05%.
- the film was formed into a film with a thickness of 50 ⁇ and a size of 100 mm ⁇ 100 mm, and the warp rate when left in an atmosphere at 60 ° C and 95% humidity for 500 hours was as follows.
- a base film satisfying these requirements of 1% or less it is possible to obtain a polarizing plate protective film having a structure in which warpage, deformation, distortion, and the like hardly occur in the entire liquid crystal display.
- the resin contained in the resin material is not particularly limited as long as it has transparency.
- alicyclic structure-containing polymer resin polycarbonate polymer resin, polyester polymer resin, polysulfone polymer resin, polyethersulfone polymer resin, polystyrene polymer resin, polyolefin polymer resin
- examples thereof include a polyvinyl alcohol-based polymer resin, a cellulose acetate-based polymer resin, a polyvinyl chloride-based polymer resin, and a polymethacrylate-based polymer resin.
- an alicyclic structure-containing polymer resin is preferred because of its low photoelastic coefficient and water absorption.
- the alicyclic structure-containing polymer resin has an alicyclic structure in a repeating unit of the polymer resin, and includes a polymer resin having an alicyclic structure in a main chain and an alicyclic structure in a side chain. And a polymer resin having a structure.
- Examples of the alicyclic structure include a cycloalkane structure and a cycloalkene structure, and a cycloalkane structure is preferred from the viewpoint of thermal stability and the like.
- the number of carbon atoms constituting the alicyclic structure is not particularly limited, but is usually 4 to 30, preferably 5 to 20, and more preferably 6 to 15 carbon atoms. When the number of carbon atoms constituting the alicyclic structure is in this range, a stretched film having excellent heat resistance and flexibility can be obtained.
- the proportion of the repeating unit having an alicyclic structure in the alicyclic structure-containing polymer resin may be appropriately selected according to the purpose of use, but is usually 50% by weight or more, preferably 70% by weight or more.
- the repeating unit other than the repeating unit having an alicyclic structure in the alicyclic structure-containing polymer resin is appropriately selected depending on the purpose of use.
- Specific examples of the alicyclic structure-containing polymer resin include (i) a norpolene-based polymer, (ii) a monocyclic cyclic olefin polymer, (iii) a cyclic conjugated gen-based polymer, and (iv) a bullet alicyclic. Hydrocarbon polymers; and hydrides of (i) to (iv). Among these, hydrides of norbornene-based polymers, vinyl alicyclic hydrocarbon polymers and hydrides thereof are preferable because of excellent heat resistance and mechanical strength, and hydrides of norbornene-based polymers are more preferable. .
- the norbornene-based polymer used in the present invention is mainly composed of norbornene-based monomers such as norbornene and its derivatives, tetracyclododecene and its derivatives, dicyclopentadiene and its derivatives, methanotetrahydridofluorene and its derivatives. It is a polymer of the following monomer.
- the norbornene-based polymer examples include (a) a ring-opening polymer of a norbornene-based monomer, and (b) a ring-opening copolymer of a norbornene-based monomer and another monomer copolymerizable therewith. (C) an addition polymer of a norbornene-based monomer, (d) an addition polymer of a norbornene-based monomer and another monomer copolymerizable therewith, and (a) to (d) Hydride and the like.
- norbornene-based monomer examples include, for example, Bisik [2.2.1] hept-12-ene (common name: norbornene), tricyclo [4. 3. 0. I 2 ' 5 ] Jen (common name: dicyclopentadiene), 7, 8_ benzo tricyclo [4.3.1 0.1 2 '5]
- Deka 3- E emissions common name: Metanotetorahi Dorofuruo Ren
- tetracyclo [4.4. 0.1 2 '. 5 1 7' 1 0]
- Dodeka 3- E emissions trivial name: tetracyclododecene
- derivatives of these compounds e.g., ring those having a substituent
- examples of the substituent include an alkyl group, an alkylene group, an alkoxycarbonyl group, a carboxyl group and the like. Further, a plurality of these substituents may be the same or different and may be bonded to a ring.
- the norponene-based monomers can be used alone or in combination of two or more.
- Examples of other monomers capable of ring-opening copolymerization with norbornene-based monomers include monocyclic olefins such as cyclohexene, cycloheptene and cyclootaten, and the like. And cyclic derivatives such as cyclohexadiene and cyclohexadiene, and derivatives thereof.
- Ring-opening polymers of norbornene-based monomers and ring-opening copolymers of norbornene-based monomers and other monomers copolymerizable therewith are prepared by subjecting the monomers to a ring-opening polymerization catalyst. It can be obtained by polymerization.
- a ring-opening polymerization catalyst a commonly used known one can be used.
- the monomers For addition polymers of norbornene-based monomers and addition copolymers of norbornene-based monomers and other copolymerizable monomers, the monomers must be polymerized in the presence of an addition polymerization catalyst. Can be obtained by As the addition polymerization catalyst, a commonly used known one can be used.
- monomers that can be addition-copolymerized with norbornene-based monomers include, for example, ⁇ -olefins having 2 to 20 carbon atoms such as ethylene and propylene and derivatives thereof; cycloolefins such as cyclobutene and cyclopentene And non-conjugated diene such as 1,4-hexadiene and the like. These monomers can be used alone or in combination of two or more. Of these, hyolefins are preferred, and ethylene is more preferred.
- Examples of the monocyclic cyclic olefin polymer include addition polymers such as cyclohexene, cycloheptene, and cyclooctene.
- cyclic conjugated polymer examples include, for example, a polymer obtained by subjecting a cyclic conjugated monomer such as cyclopentadiene or cyclohexadiene to 1,2-addition polymerization or 1,4-addition polymerization. be able to.
- the Bull alicyclic hydrocarbon polymer is a polymer having a repeating unit derived from a vinyl alkene or a alkene.
- vinyl alicyclic hydrocarbon polymers include, for example, polymers of vulcycloalkanes such as vulcyclohexane, vinyl alicyclic hydrocarbon compounds such as vinylcyclohexenes such as vinylcyclohexene, and the like. Hydrides; hydrides of aromatic portions of polymers of butyl aromatic hydrocarbon compounds such as styrene and ⁇ -methylstyrene;
- vinyl alicyclic hydrocarbon polymers include vinyl alicyclic hydrocarbon compounds and vinyl. Copolymers such as random copolymers and block copolymers of aromatic hydrocarbon compounds with other monomers copolymerizable with these monomers, and hydrides thereof may be used.
- the block copolymer includes jib block, triblock or multiblock block / inclined block block copolymer, but is not particularly limited.
- the molecular weight of the alicyclic structure-containing polymer resin is determined by gel permeation using cyclohexane (toluene if the polymer resin does not dissolve) as a solvent. Polyisoprene or polystyrene equivalent as measured by chromatography. Weight average molecular weight S, usually between 10,000 and 300,000, preferably between 15,000 and 250,000, more preferably between 20,000 and 200,000, the mechanical strength of the film This is highly balanced with the moldability and the formability.
- a ring-opening polymer of a norbornene-based monomer, a ring-opening copolymer of a norbornene-based monomer and another monomer capable of ring-opening copolymerization, an addition polymer of a norbornene-based monomer, and A hydride of an addition polymer of a norbornene-based monomer and another monomer copolymerizable with the norbornene-based monomer may be added with a known hydrogenation catalyst to hydrogenate carbon-carbon unsaturated bonds, preferably 90% or more. Can be obtained.
- the glass transition temperature of the resin material may be appropriately selected depending on the purpose of use, but is preferably 80 ° C. or higher, more preferably 100 to 250 ° C.
- a substrate film made of a resin material having a glass transition temperature in such a range does not generate deformation or stress when used under high temperature and high humidity, and has excellent durability.
- the molecular weight distribution (weight average molecular weight (Mw) and number average molecular weight (Mn)) of the resin material is not particularly limited, it is usually 1.0 to 10.0, preferably 1.0 to 6.0, and more preferably 1 to 10.0.
- the range is from 1 to 4.0. By adjusting the molecular weight distribution in such a range, the mechanical strength and the formability of the film are improved.
- the base film used in the present invention has an average thickness of 50 ⁇ and a size of l O OmmX IO 0 mm. Formed from a resin material that has a warpage of 1% or less, and preferably 0.8% or less when left in an atmosphere of 60 ° C and 95% humidity for 500 hours.
- the substrate film used in the present invention has a predetermined shape. Even if it is molded into a rug and left for a long time under high humidity and high temperature, the warpage ratio is as small as 1% or less, so that it adheres to the anti-reflective layer and when it is bonded to other films. Excellent workability.
- the warpage rate can be specifically determined as follows. First, using the same resin material as the base film, a film molded product 1 having an average thickness of 50 m and a size of 10 Omm X 10 Omm is prepared. Next, this is left for 500 hours in an atmosphere of 60 ° C and a humidity of 95%. Next, as shown in Fig. 1, the film molded product 1 after the test was placed on a horizontal platen 2, and the distance h (mm) from the platen surface to the lower side of the part farthest from the platen surface was measured. Measure with a vernier caliper, and determine the ratio of the distance to the length (10 O mm) of the film molded product as the warpage rate (%).
- warpage ratio (%) hZl0X100.
- compounding agents can be added to the resin material as desired. There are no particular restrictions on the compounding agent as long as it is commonly used in thermoplastic resin materials. For example, oxidation of phenol-based antioxidants, phosphoric acid-based antioxidants, zeo-based antioxidants, etc.
- UV absorbers such as benzotriazole-based UV absorbers, benzoate-based UV absorbers, benzophenone-based UV absorbers, acrylate-based UV absorbers, metal complex-based UV absorbers, etc .
- light such as hindered amine-based light stabilizers Stabilizers
- coloring agents such as dyes and pigments
- fatty alcohol esters, polyhydric alcohol esters, fatty acid amides, lubricants such as inorganic particles
- Plasticizers such as plasticizers and oxyester plasticizers
- antistatic agents such as fatty acid esters of polyhydric alcohols; and the like.
- the melt flow rate of the resin material used in the present invention is a melt flow rate at 280 ° C. and 2.16 kgf load amount%, usually 1 to 100 g / 10 minutes, preferably 2 to 5 g. 0 g / 10 minutes, more preferably 3 to 40 g Z10 minutes. Menoletov mouth If one rate is less than 1 g 10 minutes, the workability during molding is poor, and if it is more than 100 g / 10 minutes, thickness unevenness occurs at the time of sheet molding.
- Base film for use in the present invention is characterized in that the photoelastic coefficient 9 X 1 0- 1 2 P a- 1 less than, and preferably less than 7 X 1 0- 1 2 P a- 1.
- photoelastic coefficient is of 9 X 1 0 one 1 and less than 2 P a- 1, optical distortion is unlikely to occur by an external stress, the phase difference by slight stress changes It does not develop or change.
- the photoelastic coefficient is also referred to as a piezo optical coefficient, is a material constant that describes the magnitude of the piezo optical effect (photoelastic effect), and can be measured using an ellipsometer.
- the photoelastic coefficient is a value indicating the degree of optical distortion with respect to an external stress. The smaller the value, the better the optically good as a protective film for a polarizing plate.
- the substrate film used in the present invention has a saturated water absorption of less than 0.05% by weight, preferably less than 0.03% by weight. Since the base film used in the present invention has a small saturated water absorption of less than 0.05% by weight, when the antireflection layer is formed, water is released to deteriorate the quality and the productivity is reduced. Does not decrease. Further, the base film does not expand and contract due to moisture absorption due to long-term use, and the antireflection layer does not peel off from the base film.
- the saturated water absorption of the base film is 23 according to ASTM D530. It can be determined by immersing in C for one week and measuring the weight gain.
- the base film used in the present invention preferably has a volatile component content of 0.1% by weight or less, more preferably 0.05% by weight or less.
- a volatile component content of 0.1% by weight or less, more preferably 0.05% by weight or less.
- the volatile component is a substance having a molecular weight of 200 or less contained in a trace amount in the base film, and examples thereof include a residual monomer and a solvent.
- the content of volatile components can be determined by analyzing the base film by gas chromatography as the total of substances having a molecular weight of 200 or less contained in the alicyclic structure-containing polymer resin. .
- the substrate film used in the present invention can be obtained by molding the above resin material into a film by a known molding method and adjusting the photoelastic coefficient, the saturated water absorption, and the content of the volatile component.
- Examples of a method for forming the resin material into a film include a solution casting method and a melt extrusion molding method. Among them, the melt extrusion molding method is preferable because the content of volatile matter generated in the base film and the thickness unevenness can be reduced. Examples of the melt extrusion molding method include a method using a die such as a T die and an inflation method, but a method using a T die is preferable in terms of excellent productivity and thickness accuracy.
- the melting temperature of the resin material in an extruder having a T die is 80 to 180 ° C. higher than the glass transition temperature of the resin material. The temperature is preferably set to 100 ° C.
- the resin material to be used is preliminarily dried before being formed into a film. Preliminary drying is performed, for example, in the form of pellets using a hot air dryer. The drying temperature is preferably 100 ° C. or more, and the drying time is preferably 2 hours or more. By performing the preliminary drying, the amount of volatile components in the film can be reduced, and foaming of the resin material to be extruded can be prevented.
- a preferred method of manufacturing the base film used in the present invention is to make the molten resin material extruded from the extruder circumscribe the first cooling drum, the second cooling drum, and the third cooling drum in order.
- the ratio R 3 ZR 2 of the peripheral speed R 3 of the third cooling drum is less than 0.999, and 0.99 or more. If the value of R 3 / R 2 is excessively large, the resin material is stretched, and the obtained base film tends to be warped or uneven in thickness.
- the ratio R 2 of the peripheral speed R 2 of the second cooling drum to the peripheral speed of the first cooling drum is preferable to be less than 1.01, 0.99 or more, and 1.90. More preferably, it is set to be less than 0.000 and 0.995 or more.
- R 2 the molecular orientation of the obtained film becomes particularly small, which can reduce the heat shrinkage. Further, it is possible to further prevent the occurrence of a winding jig.
- the temperature difference between the first cooling drum and the second cooling drum is 20 ° C. or less.
- the base film used in the present invention one having one or both surfaces subjected to a surface modification treatment may be used.
- the surface modification treatment By performing the surface modification treatment, the adhesion to the hard coat layer can be improved.
- the surface modification treatment include energy beam irradiation treatment and chemical treatment.
- Examples of the energy beam irradiation treatment include a corona discharge treatment, a plasma treatment, an electron beam irradiation treatment, and an ultraviolet irradiation treatment. From the viewpoint of treatment efficiency and the like, a corona discharge treatment and a plasma treatment are preferred, and a corona discharge treatment is particularly preferred.
- the chemical treatment it may be immersed in an aqueous solution of an oxidizing agent such as a potassium dichromate solution or concentrated sulfuric acid, and then sufficiently washed with water. Shaking while immersed is effective, but when treated for a long period of time, the surface may dissolve or transparency may decrease. Therefore, it is necessary to adjust the treatment time according to the reactivity and concentration of the chemical used.
- an oxidizing agent such as a potassium dichromate solution or concentrated sulfuric acid
- the thickness of the substrate film is preferably from 30 to 300 Mm, more preferably from 40 to 200 ⁇ , from the viewpoint of mechanical strength and the like.
- the polarizing plate protective film of the present invention is obtained by laminating an antireflection layer directly or via another layer on the base film.
- the anti-reflection layer is a portion having a substantial anti-reflection function, and may have a single-layer structure or a multi-layer structure.
- A. VAS I CEK, “ ⁇ I CS OF THI NFI LMS”, pp. 159-283 [North Holland Clarz Singka, Amsterdam (1960): NORTH-HOLLAND PUBL I SHING COMPANY, AMSTERDAM (1960)]
- JP-A-58-46301, JP-A-59-49501, JP-A-59-50401, JP-A-1-294709, and JP-B-6-5324 And those having a structure.
- the layer structure of the antireflection layer is preferably a single layer film of an inorganic oxide or a multilayer film of two or more layers, and a thin film having a relatively low refractive index and a relatively high refractive index. More preferably, it is a composite multilayer film of two or more layers made of different kinds of inorganic oxides, which are alternately laminated with the above thin films. In such a composite multilayer film, the thickness and refractive index of each layer are described in, for example, “OPT I CS OF
- THIN FI LMS can be set according to known techniques.
- An inorganic substance can be used for forming the antireflection layer.
- inorganic oxides L i F, Na F , M g F 2, 3 N a F / a 1 F 3, B a F 2, Ca F 2, S r F 2, LaF 2, a l F 3, Na 3 inorganic fluoride such as a 1 F 6; Inorganic halides; etc .; You.
- a material having a known refractive index it is also possible to use a material in which ultrafine particles are dispersed in a matrix material such as a resin to make the refractive index variable and adjusted to a desired refractive index value.
- candidates for the fine particles to be dispersed in the matrix material include inorganic fluorides such as magnesium fluoride, silica-based fine particles, and minute holes made of a gas such as vacuum, air, or nitrogen. From the viewpoint of obtaining a low refractive index material, it is preferable to use silica-based hollow fine particles dispersed in a matrix.
- Means for forming these fine particle-containing layers include a method of applying and drying a coating composition obtained by dispersing in a matrix forming material.
- the thickness of the antireflection layer is usually from 0.11 to 50; um, preferably from 0.1 to 30 / ⁇ m, and more preferably from 0.5 to 20; zm.
- the thickness is less than 0.01 ⁇ m, the antireflection effect cannot be exhibited, and when the thickness exceeds 50 ⁇ m, the thickness of the coating film tends to be uneven, and the appearance and the like are unfavorably deteriorated.
- another layer can be interposed between the base film and the antireflection layer.
- Other layers include a primer layer and a hard coat layer.
- the primer layer is formed for the purpose of imparting and improving the adhesion between the base film and the antireflection layer.
- the material constituting the primer layer include polyester urethane resin, polyether urethane resin, polyisocyanate resin, polyolefin resin, resin having a hydrocarbon skeleton and / or polybutadiene skeleton in the main chain, and polyamide resin.
- a modified resin and a modified cyclized rubber having a hydrocarbon skeleton and / or a polyptadene skeleton in the main chain are preferable.
- resins having a hydrocarbon skeleton and / or polybutadiene skeleton in the main chain include: A resin having a butadiene skeleton or a skeleton obtained by hydrogenating at least a part thereof, specifically, polybutadiene resin, hydrogenated polybutadiene resin, styrene 'butadiene' styrene block copolymer (SBS copolymer) and hydrogenation thereof (SEBS copolymer).
- SBS copolymer styrene 'butadiene' styrene block copolymer
- SEBS copolymer hydrogenation thereof
- a hydrogenated modified styrene / butadiene / styrene block copolymer is preferred.
- carboxylic acid or a derivative thereof is preferable.
- unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, and fumaric acid; maleyl chloride, maleimide, maleic anhydride, citraconic anhydride And derivatives thereof such as halides, amides, imides, anhydrides and esters of unsaturated carboxylic acids; and unsaturated carboxylic acids or unsaturated carboxylic acids because of their excellent adhesion.
- a modified product with an anhydride is preferable, acrylic acid, methacrylic acid, maleic acid, and maleic anhydride are more preferable, and maleic acid and maleic anhydride are particularly preferable.
- the method for forming the primer layer is not particularly limited.
- a coating solution for forming a primer layer may be prepared by a known coating method.
- the thickness of the primer layer is not particularly limited, but is usually 0.01 to 5 ⁇ , preferably 0.1 to 2 ⁇ .
- the hard coat layer is formed for the purpose of reinforcing the surface hardness, the repetitive fatigue resistance and the abrasion resistance of the base film.
- the material for forming the hard coat layer include organic hard coat materials such as organic silicone, melamine, epoxy, and acrylic; and inorganic hard coat materials such as silicon dioxide. Among them, the use of a polyfunctional acrylate-based hard coat material is preferred from the viewpoints of good adhesive strength and excellent productivity.
- the method for forming the hard coat layer is not particularly limited. For example, a method in which a coating liquid for forming a hard coat layer is coated on a base film by a known coating method, and is irradiated with ultraviolet rays to be cured and formed. Is mentioned.
- the thickness of the hard coat layer is not particularly limited, but is usually 0.5 to 30 ⁇ , preferably 3 to 15 ⁇ m.
- the polarizing plate protective film of the present invention in order to protect the antireflection layer and enhance the antireflection performance, it is preferable that the polarizing plate protective film further has an antireflection layer on the antireflection layer.
- the material constituting the antifouling layer is not particularly limited as long as the function of the antireflection layer is not hindered and the required performance as the antifouling layer is satisfied.
- a compound having a hydrophobic group can be preferably used.
- perfluoroalkylsilane compounds, perfluoropolyethersilane compounds, and fluorine-containing silicone compounds can be used.
- the antifouling layer can be formed by, for example, a physical vapor deposition method such as vapor deposition or sputtering, a chemical vapor deposition method such as CVD, or a wet coating method, depending on the material to be formed.
- the thickness of the antifouling layer is not particularly limited, but is usually preferably 2 O nm or less, more preferably 1 to 10 nm.
- the polarizing plate protective film of the present invention has excellent gas barrier properties, and when bonded to a polarizing plate, can prevent the performance of the polarizing plate from deteriorating due to the transmission of water vapor or oxygen. Gasparability can be evaluated by oxygen permeability and water vapor permeability.
- the polarizing plate protective film of the present invention has an oxygen permeability measured at a temperature of 23 ° C. and a humidity of 90% RH of 2.5 cm 3 / m 2 / day / atm or less, and a temperature of 38 ° (: humidity of 100%).
- % preferably has a water vapor permeability 2. below 5 g / m 2 / ⁇ ay / a tm measured in RH, the oxygen permeability 2.
- the water vapor transmission rate is 2.0 g / m 2 / day / atm or less.
- the oxygen transmission rate and the water vapor transmission rate are known oxygen gas transmission rate measuring apparatuses and known water vapor transmission rate measuring apparatuses. Can be measured.
- the polarizing plate protective film of the present invention includes, for example, a mobile phone, a digital information terminal, a bottle bell (registered trademark), a navigation, an in-vehicle liquid crystal display, a liquid crystal monitor, a light control panel, a display for OA equipment, and a display for AV equipment. It is useful as a protective film for a polarizing plate such as a liquid crystal display device, a select-port luminescence display device, or a touch panel.
- the method for producing a polarizing plate protective film according to the present invention includes a method for producing a polarizing plate on a surface of a substrate film made of a resin material, or on a surface of another layer of a substrate film on which another layer is formed.
- the step of forming the anti-reflection layer may be performed by using the other layer of the base finolem having another layer formed on or on the surface of the base film.
- An anti-reflection layer is formed by sequentially laminating a plurality of inorganic oxide thin films on the surface, wherein the base film or the base film on which another layer is formed on the surface is made of an inorganic material.
- a plurality of film forming chambers having film forming means for forming an oxide thin film are sequentially passed through, and the film forming means in each film forming chamber forms a substrate on the surface of the base film or on which another layer is formed.
- the step is a step of sequentially laminating a plurality of inorganic acid thin films on the surface of the other layer of the material film.
- Method for manufacturing a polarizing plate protective film of the present invention the photoelastic coefficient of 9 X 1 0- 1 2 P a one less than 1, the saturated water absorption is less than zero. 0 5% and the average thickness of the resin material 5 Formed into a film with a size of 0 im and a size of 100 mm x 100 mm and having a warp rate of 1% or less when left for 500 hours in an atmosphere of 60 ° C and 95% humidity. Since a material film is used, there is no need to provide a drying step before forming an anti-reflection layer as in the related art.
- a polarizing plate protective film can be continuously produced by continuously forming a primer layer, a hard coat layer, an antireflection layer, and an antifouling layer from a base film.
- This continuous production method can be carried out, for example, using a film forming apparatus shown in FIG.
- the film forming apparatus shown in FIG. 2 comprises a primer layer forming section 4, a hard coat layer forming section 5, an antireflection layer forming section 6, and an antifouling layer forming section 7.
- the antireflection layer forming section 6 includes four film forming chambers (6a to 6d) each having a film forming means for forming an inorganic oxide thin film.
- This film forming apparatus is a continuous apparatus for continuously forming a primer layer, a hard coat layer, an antireflection layer composed of four layers, and an antifouling layer on a base film.
- a primer layer is formed on a long base film 3 wound up in a roll.
- a primer layer and a hard coat layer are sequentially formed.
- the forming material and forming method of the primer layer and the hard coat layer are as described above.
- the film is sequentially passed through the four film forming chambers (6a to 6d) of the antireflection layer forming section 6, and the film forming means of each film forming chamber forms the hard coat layer of the base film.
- An anti-reflection layer consisting of a total of four layers is formed by sequentially laminating a plurality of thin films on the surface.
- the means for forming the anti-reflection layer is not particularly limited, and a known film forming means can be adopted. However, when an inorganic oxide thin film is formed, an ion plating method, a sputtering method, or a vacuum evaporation method is used. It is preferable to use any one of the electroless plating method and the electroplating method.
- the base film on which the anti-reflection layer is formed is fed to the anti-reflection layer forming section 7 to form an anti-fouling layer on the anti-reflection layer.
- the material and method for forming the antifouling layer are as described above.
- the base film (polarizing plate protective film) 8 having an antifouling layer formed on its surface is wound into a roll and can be stored and transported.
- the continuous vacuum sputter film forming apparatus shown in FIG. 3 has an unwinding roll 10a, a guide opening 9a, 9b, 9c, 9d, a film forming roll 10b in a vacuum chamber 6e. It is provided with a film forming power source 12a, 12b equipped with a target lla, 11b, a winding roll 10c, and a vacuum pump 13. Then, the long hard coat layer laminated film 3a wound in a roll shape is loaded on an unwinding roll 10a.
- the continuous vacuum sputtering film forming apparatus shown in FIG. 3 includes two targets and two film forming cathodes, the number of these units is not particularly limited.
- the loaded base film 3 a on which the hard coat layer is laminated is unwound from the unwinding roll 10 a, it is guided to a plurality of guide rolls 9 a and 9 b to form a film forming roll. It circumscribes 10b, passes through further guide rolls 9c, 9d, and reaches the winding roll 10c.
- a film-forming force source 12a and 12b with a target 11a and lib are installed around the film-forming roll 10b, and the base wound around the film-forming roll 10b by sputtering. Low refractive index layer on the surface of material film 3a And a high refractive index layer are continuously formed.
- the base film 3a on which the hard coat layer on which the high refractive index layer and the low refractive index layer are laminated is guided to the guide rolls 9c and 9d on the opposite side, and the winding roll 10 Winded by c.
- the temperature T s (° C.) of the film forming roll 10 b is (T g— 13 0) ( (° C) ⁇ Ts (° C) ⁇ Tg (° C).
- the vacuum chamber 6 e is constantly evacuated by the vacuum pump 13, and a working gas and a reaction gas (not shown) necessary for the film formation are introduced by a cylinder.
- the working gas include an inert gas, and specifically, a rare gas such as argon is used.
- the reactive gas usually includes oxygen.
- the pressure in the vacuum chamber is usually 1 0 2-1 0 - in the range of 5 P a.
- the winding direction and the like are sequentially changed using a film winding type vacuum film forming apparatus as shown in FIG.
- the take-up roll 10c is used as a take-up roll and the take-up roll 10a is used as a take-up roll
- a film winding type vacuum film forming apparatus as shown in FIG. 3 may be connected in series to form a low refractive index layer and a high refractive index layer continuously.
- the polarizing plate protective film is manufactured by continuously forming a total of four antireflection layers, but the layer configuration of the antireflection layer is not limited to this.
- An antireflection layer comprising a layer, or a multilayer of two, three, or five or more layers can also be formed by the same method.
- the adhesion between the antireflection layers or between the antireflection layer and the antifouling layer is improved.
- the surface of the antireflection layer may be subjected to a surface modification treatment. surface By performing the modification treatment, the adhesion between the antireflection layer or the antireflection layer and the antifouling layer can be improved. Examples of the method for the surface modification treatment include the above-described energy ray irradiation treatment and chemical treatment.
- FIG. 4 shows an example of the layer configuration of the polarizing plate protective film manufactured as described above.
- the polarizing plate protective film 81 shown in FIG. 4 has a base film layer 14, a primer layer 21, a hard coat layer 31, a first antireflection film 41a, and a second
- the anti-reflection layer 41 includes a four-layer anti-reflection layer 41, a third anti-reflection film 41 c, and a fourth anti-reflection film 41 d, and an antifouling layer 51.
- the polarizing plate protective film obtained by the production method of the present invention has excellent interlayer adhesion, and does not cause delamination or the like even when left under high temperature and high humidity for a long time.
- the polarizing plate with an antireflection function of the present invention is characterized in that a polarizing plate is laminated on one surface of the base film of the polarizing plate protective film of the present invention on which the antireflection layer is not provided. I do.
- the polarizing plate that can be used in the present invention is not particularly limited as long as it has a function as a polarizing plate.
- a polyvinyl alcohol (PVA) -based or polyene-based polarizing plate can be used.
- the method for producing the polarizing plate is not particularly limited.
- a method for producing a PV ⁇ -based polarizing plate a method in which iodine ions are adsorbed on a PVA-based film and then uniaxially stretched, a method in which the PVA-based film is uniaxially stretched and iodine ions are adsorbed, Simultaneous adsorption of iodine ions and uniaxial stretching on VA-based film, uniaxial stretching after dyeing PVA-based film with dichroic dye, dichroic dye after uniaxially stretching PVA-based film And a method of simultaneously dyeing a PVA-based film with a dichroic dye and uniaxially stretching.
- Polyene-based polarizing plates can be produced by uniaxially stretching a PVA-based film and then heating and dehydrating it in the presence of a dehydration catalyst. Known methods, such as a method of heating and dehydrating in the presence, may be mentioned.
- the polarizing plate with an antireflection function of the present invention can be manufactured by laminating a polarizing plate on one surface of the base film of the polarizing plate protective film of the present invention on which the antireflection layer is not provided. .
- Lamination of the polarizing plate protective film and the polarizing plate can be performed by using an appropriate bonding means such as an adhesive or an adhesive.
- an adhesive or an adhesive examples include an acrylic, a silicone, a polyester, a polyurethane, a polyetherene, and a rubber. Among them, acrylic ones are preferred from the viewpoint of heat resistance and transparency.
- FIG. 5 is a cross-sectional view of the layer structure of the polarizing plate with an antireflection function of the present invention.
- the polarizing plate 91 with an anti-reflection function shown in FIG. 5 is provided on the surface of the polarizing plate protective film of the present invention, on which the anti-reflection layer 41 is not provided, via an adhesive or pressure-sensitive adhesive layer 71.
- the plate 61 has a laminated structure. .
- another protective film is laminated via an adhesive or a pressure-sensitive adhesive layer on the surface of the polarizing plate on which the polarizing plate protective film of the present invention is not laminated. It may be.
- the protective film is preferably made of a material having low optical anisotropy.
- the material having a small optical anisotropy is not particularly limited, and examples thereof include a cellulose ester such as triacetyl cellulose and a polymer resin having an alicyclic structure, such as transparency, low birefringence, and dimensional stability.
- An alicyclic structure-containing polymer resin is preferred because of its excellent properties.
- Examples of the alicyclic structure-containing polymer resin include the same resins as those described in the section of the base film of the present invention.
- Examples of the adhesive or pressure-sensitive adhesive include those similar to the adhesive or pressure-sensitive adhesive used for laminating the polarizing plate protective film and the polarizing plate.
- the thickness of the polarizing plate with an antireflection function of the present invention is not particularly limited, it is generally in the range of 60 ⁇ to 2 mm.
- the polarizing plate with an anti-reflection function of the present invention is a polarizing plate having a structure in which warping, deformation, distortion, etc. hardly occur as a whole even when it is placed in a high-temperature, high-humidity environment for a long time. ing
- An optical product of the present invention includes the polarizing plate with an antireflection function of the present invention. You. Preferable specific examples of the optical product of the present invention include a liquid crystal display device, a touch panel, and an electroluminescent display device.
- FIG. 6 shows an example of a layer configuration of a liquid crystal display device including the polarizing plate with an antireflection function of the present invention as an example of an optical product including the polarizing plate with an antireflection function of the present invention.
- the liquid crystal display device shown in FIG. 6 includes, in order from the bottom, a polarizing plate 101, a retardation plate 102, a liquid crystal cell 103, and a polarizing plate 91 with an antireflection function of the present invention.
- the polarizing plate 91 with an anti-reflection function is formed on the liquid crystal cell 103 by bonding the polarizing plate with an adhesive or a pressure-sensitive adhesive (not shown).
- the liquid crystal cell 103 for example, as shown in FIG.
- two electrode substrates 105 each having a transparent electrode 104 are arranged at a predetermined interval in a state where they face each other with a transparent electrode 104, and a gap is provided between the two electrodes. It is produced by enclosing the liquid crystal 106.
- reference numeral 107 denotes a seal.
- the liquid crystal mode of the liquid crystal 106 is not particularly limited.
- the liquid crystal modes include TN (Twisted Nematic), STN (Super Twisted Nematic), HAN (Hybrid Alig nment Nematic), VA (Vertical Alignment), and MVA. (Mu1 tiple Vertical Alignment) type, IPS (InP1ane Switching) type, OCB (Optical Cosmended Bend) type and the like.
- the liquid crystal display device shown in FIG. 7 has a normally white mode in which the display is bright when the applied voltage is low and a dark display when the applied voltage is high, and a normally black mode in which the display is dark when the applied voltage is low and bright when the applied voltage is high. Mode can also be used.
- the optical product of the present invention includes the polarizing plate with an antireflection function of the present invention, which is excellent in durability without generating deformation or stress when used under high temperature and high humidity. Therefore, even when used under a high temperature and a high humidity for a long time, there is no loss of color at the end of the display panel and no variation in hue in the display panel surface.
- the menoleto flow rate was 4.2 g / 10 minutes.
- a mixture containing DCP and bicyclo [4.2.1] hept-12-ene (common name: norbornene; abbreviated as NB hereinafter) in a weight ratio of DCP / NB 80/20.
- the product was subjected to ring-opening polymerization by a known method, and then hydrogenated to obtain DCP / NB ring-opening copolymer hydrogen additive 2.
- the hydrogenated product of the ring-opened copolymer 2 had a Mw of 43,000, a MWD of 3.2, a Tg of 70 ° C, and a melt flow rate of 23 gZl0 min.
- a pellet (granular) molding material was obtained in the same manner as in Production Example 1.
- Hexafunctional urethane acrylate copolymer (Shin-Nakamura Chemical Co., Ltd., trade name "NK Oligo U-6HAJ”) 30 parts, butyl acrylate 40 parts, isoboronyl methacrylate (Shin-Nakamura Chemical Co., trade name "NK” Ester IBJ) (30 parts) and 2,2-dimethoxy-1,1-one (10 parts) were mixed with a homogenizer to prepare a hard coat agent comprising an ultraviolet-curable resin composition.
- Maleic anhydride-modified styrene / butadiene / styrene block copolymer hydrogenated product (Asahi Kasei Co., Ltd., Tuftec Ml 913, melt index value 200 ° C, 5 kg load 4.Og / 10min, styrene block content 30 weight 0/0, the hydrogenation rate of 80% or more, a maleic acid addition of 2% absolute) to 2 parts, was dissolved in a mixed solvent of 8 parts of xylene and methyl iso Puchiruketon 40 parts, having a pore size of iota Myupaiiota polytetramethylene full O Roe Ji Ren Was filtered to prepare only a complete solution as a primer solution.
- the pellet obtained in Production Example 1 was dried at 110 ° C. for 4 hours using a hot-air dryer through which air was passed.
- the pellets are then coated on the inner surface using a T-die type film melt extruder equipped with a resin melt kneader equipped with a 65 mm ⁇ screw equipped with a leaf disk-shaped polymer filter (filtration accuracy 30 m).
- the primer solution obtained in Production Example 4 was applied to one of the surfaces of the surface-modified base film 1B subjected to the surface modification treatment so that the dried primer layer had a thickness of 0.5 ⁇ m.
- the resultant was applied using a die coater and dried in a drying oven at 80 ° C. for 5 minutes to obtain a base film 1C having a primer layer.
- Base film having a primer layer A die coater is applied to the surface of the side having the primer layer of 1C so that the thickness of the hard coat layer after curing the hard coat agent obtained in Production Example 3 is 5 m. And was applied continuously. Next, after drying at 80 ° C. for 5 minutes, ultraviolet irradiation (integrated light amount of 300 mj / cm 2 ) was performed to cure the hard coat agent to obtain a film 1D with a hard coat layer. This film 1D with the hard coat layer was wound into a roll. The thickness of the hard coat layer after curing was 5 ⁇ .
- a long roll of the above-mentioned film 1D with a hard coat layer was loaded into a continuous vacuum sputtering film forming apparatus as shown in FIG. 3, and the inside was evacuated.
- Vacuum chamber When one pressure reaches 1 X 10-5 Pa, film formation by the sputtering method is started, and at a temperature of 80, a low refractive index layer (Si0 2 layer) and a high An antireflection layer composed of a total of four layers, in which refractive index layers (ITO layers) were alternately laminated, was formed.
- the thickness of the anti-reflection layer is, from the hard coat layer side, the first SiO 2 layer: 20 nm, the first ITO layer: 30 nm, the second SiO 2 layer: 40 nm, the second I O layer.
- TO layer 100 nm.
- a fluorine-based surface antifouling coating agent (Optool DSX, manufactured by Daikin Industries, Ltd.) was diluted to 0.1% by weight with Hexane perfluoro as an antifouling layer, and applied by a dip coating method. After the application, the coating was dried by heating at 60 ° C. for 1 minute to form an antifouling layer having a thickness of 5 n.
- Example 1 was repeated except that the base film 1A was replaced with a triacetyl cellulose film having a thickness of 50 ⁇ (trade name: Fujitac, manufactured by Fuji Photo Film, base film 2 mm). The same operation was performed to obtain a polarizing plate protective film 2E of Comparative Example 1.
- Example 1 was repeated except that a polyethylene terephthalate film having a thickness of 50 ⁇ (trade name: Lumirror T60 # 50, manufactured by Toray, base film 3A) was used instead of base film 1A. The same operation was performed to obtain a polarizing plate protective film 3E of Comparative Example 2.
- a polyethylene terephthalate film having a thickness of 50 ⁇ (trade name: Lumirror T60 # 50, manufactured by Toray, base film 3A) was used instead of base film 1A.
- the same operation was performed to obtain a polarizing plate protective film 3E of Comparative Example 2.
- Example 2 Using the pellet obtained in Production Example 2 in place of the pellet obtained in Production Example 1, the molten resin temperature and the die temperature were set to 200, the temperature of the first cooling drum was 75 ° C, and the temperature of the second cooling drum was The same operation as in Example 1 was carried out except that the temperature was 65 ° C and the temperature of the third cooling drum was 55 ° C, to obtain a base film 4A of Comparative Example 3. Further, in the same manner as in Example 1, a polarizing plate protective film 4E of Comparative Example 3 was obtained.
- the photoelastic coefficient, saturated water absorption, warpage, and volatile component content of the base films 1A to 4A used in Example 1 and Comparative Examples 1 to 3 were measured by the methods described below. (Photoelastic coefficient)
- the retardation in the film surface was measured using a letter measurement device (“KOB RA-21ADH” manufactured by Oji Scientific Instruments). This is divided by the film thickness to obtain the birefringence value n.
- the ⁇ was determined while changing the load, a load- ⁇ curve was created, and the slope was defined as the photoelastic coefficient.
- ASTM D530 it was determined by immersing in 23 for 1 week and measuring the weight gain.
- Table 1 shows the results of measuring the water absorption, the photoelastic coefficient, the warpage, and the content of the volatile component by calculating the total amount of substances having a molecular weight of 200 or less by gas chromatography.
- the oxygen gas transmission rate and the water vapor transmission rate of the polarizing plate protective film were measured using the following measuring apparatus and measuring conditions. The evaluation results are shown in Table 1 below.
- Oxygen gas permeability Measured at a temperature of 23 ° C and a humidity of 90% RH using an oxygen gas permeability measuring device (OX-TRAN 2/20, manufactured by MO CON).
- Water vapor transmission rate Measured at a temperature of 38 ° C. and a humidity of 100% RH using a water vapor transmission rate measuring device (PERMATRAN-W3 / 31, manufactured by MOCON).
- the adhesion test of the polarizing plate protective film at the initial stage and after the endurance test was carried out by a cross-cut peeling test. Make a cut of 1 at a 1 mm interval from the top of the antifouling layer at 1 mm intervals, crossing each other at right and left at a right angle, and make a 100 mm square grid with 100 squares.
- UV-VIS-NIR spectrophotometer V—570 UV-VIS-NIR spectrophotometer
- Polyvinyl alcohol film with a degree of polymerization of 2400 and a thickness of 75 ⁇ is immersed in a dyeing bath containing iodine and potassium iodide at 40 ° C for dyeing, and then boric acid and potassium iodide.
- the film was subjected to a stretching treatment and a cross-linking treatment in an acidic bath at 60 ° C in which the total stretching ratio was 5.3 times. After being washed with water, it was dried at 40 ° C. to obtain a polarizing plate having a thickness of 28 ⁇ m.
- the polarizing plate is adhered to the base film side of the polarizing plate protective film 1E obtained in Example 1 via an ataryl-based adhesive (“DP-805 clear” manufactured by Sumitomo 3LEM).
- the surface-modified base film 1B was bonded to the other surface of the polarizing plate via an acrylic adhesive to produce a polarizing plate 1F with an anti-reflection function.
- the same operation was performed using the polarizing plate protective films 2E to 4E to obtain polarizing plates 2F to 4F with an antireflection function, respectively.
- another polarizing plate was prepared, and this was used for the rear, and bonded to the opposite surface of the liquid crystal display cell, thereby producing liquid crystal display elements.
- the polarizing plate protective film of Example 1 the photoelastic coefficient of the substrate film 9 X 10- 1 2 P a- less than 1, the saturated water absorption Is less than 0.05%, and the resin material that constitutes the base film is formed into a film with an average thickness of 50 ⁇ and a size of 10 OmmX 10 Omm. Since the warpage rate after standing for 1 hour is 1% or less, even if the base film is not dried before forming the anti-reflection layer, the film may curl or become complicated after forming the anti-reflection layer. Does not deform into shape. Also, the adhesion when bonded to a polarizing plate Good.
- the polarizing plate protective film obtained by forming an antireflection layer on the polarizing plate protective film obtained in Example 1 has excellent gas-paring properties. No color loss etc. is observed at the panel edge even after being left in a high humidity environment for a long time.
- the polarizing plate protective films of Comparative Examples 1 and 2 have a large photoelastic coefficient and a high saturated water absorption of the base film, and the resin material constituting the base film has an average thickness of 50 ⁇ and a size of 1 Formed into 0 O mm X 100 mm film, 60. C, the warp rate was large when left for 500 hours in an atmosphere of 95% humidity, so that the entire film was curled after the antireflection layer was formed. Therefore, when the film is bonded to a polarizing plate, the curled film needs to be once flattened, resulting in poor working efficiency.
- the polarizing plate protective film in which the antireflection upper layer was formed on the polarizing plate protective film of Comparative Example 1 was inferior in gas barrier properties and adhesion.
- the polarizing plate protective film of Comparative Example 2 is excellent in gas barrier properties, when the polarizing plate is attached and then assembled into a liquid crystal display and left in a high-temperature, high-humidity environment for a long time, not only the panel edge but also Light leakage can be seen from a distance from the end.
- the polarizing plate protective film of Comparative Example 3 has the same photoelastic coefficient and saturated water absorption as the substrate film used in Example 1, but the average thickness of the resin material constituting the substrate film is It is formed into a film with a size of 50 ⁇ and a size of 10 Omm X 10 Omm, and has a large warpage when left in an atmosphere of 60 ° C and 95% humidity for 500 hours. Therefore, the initial adhesion and gas barrier properties were the same as those of the polarizing plate protective film of Example 1, but curling occurred after forming the antireflection layer. Therefore, when laminating with a polarizing plate, flattening work is required, and the working efficiency is poor.
- the polarizing plate protective film of Comparative Example 3 was assembled into a liquid crystal display after bonding the polarizing plate, and when left in a high-temperature, high-humidity environment for a long time, light leakage was observed near the panel edge. .
- a polarizing plate protective film having a structure in which warping, deformation, distortion, and the like hardly occur even when the polarizing plate is placed in a high-temperature, high-humidity environment for a long time. Further, the polarizing plate protective film of the present invention has excellent adhesion.
- the polarizing plate protective film of the present invention can be efficiently produced.
- a base film having a low photoelastic coefficient, a water absorption rate and a warpage rate is used, it is not necessary to specifically dry the film before forming the antireflection layer.
- the polarizing plate with an antireflection function of the present invention uses the polarizing plate protective film of the present invention, and has excellent gas barrier properties. Therefore, even if this polarizing plate with antireflection function is incorporated in a liquid crystal display element of an optical product such as a liquid crystal display device, and left in a high-temperature, high-humidity environment for a long time, excellent display performance is maintained. .
- the optical product of the present invention includes the polarizing plate with an antireflection function of the present invention, it has excellent heat resistance and moisture resistance.
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Abstract
Description
Claims
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US10/549,915 US20080095999A1 (en) | 2003-03-31 | 2004-03-26 | Protective Film For Polarizing Plate, Method For Preparation Thereof, Polarizing Plate With Antireflection Function, And Optical Article |
JP2005504194A JPWO2004088370A1 (ja) | 2003-03-31 | 2004-03-26 | 偏光板保護フィルム、その製造方法、反射防止機能付偏光板及び光学製品 |
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JP2007233333A (ja) * | 2006-02-01 | 2007-09-13 | Seiko Epson Corp | 光学物品およびその製造方法 |
JP2010286572A (ja) * | 2009-06-10 | 2010-12-24 | Topcon Corp | 反射防止膜を有する光学素子及び医療用光学機器 |
US8173202B2 (en) * | 2009-01-06 | 2012-05-08 | Innovation & Infinity Global Corp. | Multi-layer coating structure with anti-reflection, anti-static and anti-smudge functions and method for manufacturing the same |
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JPWO2004088370A1 (ja) | 2006-07-06 |
US20080095999A1 (en) | 2008-04-24 |
TW200420979A (en) | 2004-10-16 |
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