CN108603967B - Method for manufacturing polarizing plate - Google Patents
Method for manufacturing polarizing plate Download PDFInfo
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- CN108603967B CN108603967B CN201780009259.4A CN201780009259A CN108603967B CN 108603967 B CN108603967 B CN 108603967B CN 201780009259 A CN201780009259 A CN 201780009259A CN 108603967 B CN108603967 B CN 108603967B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L29/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical; Compositions of hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Compositions of derivatives of such polymers
- C08L29/02—Homopolymers or copolymers of unsaturated alcohols
- C08L29/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
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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
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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
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- Organic Chemistry (AREA)
- Optics & Photonics (AREA)
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- Crystallography & Structural Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Polarising Elements (AREA)
- Liquid Crystal (AREA)
Abstract
The invention provides a method for manufacturing a polaroid, which comprises the following steps: forming a latex layer on a base material, and drying the latex layer to produce a transfer film having an optical thin film formed on the base material; a step of attaching a polarizer to the surface of the transfer film on the side of the optical film; and a step of peeling the base material from the transfer film, wherein the latex forming the latex layer is substantially insoluble when 10 wt% of the latex is mixed with cyclohexanone, the surface energy of the base material forming the latex layer side is 41.0 to 48.0mN/m, and the thickness of the optical film is 1 to 10 μm.
Description
Technical Field
The present invention relates to a method for manufacturing a polarizing plate.
Background
The polarizing plate is an essential component constituting the liquid crystal display device. A general polarizing plate has a structure in which an optical film is bonded to one surface or both surfaces of a polarizing film in which a dichroic dye such as an iodine complex is adsorbed to a polyvinyl alcohol (PVA) resin and oriented.
In recent liquid crystal display devices, thinning and size increase have been rapidly progressing, and the problem of occurrence of light unevenness on the display surface of the liquid crystal display device accompanying environmental changes has become apparent.
In a polarizing plate which is an essential component of a liquid crystal display device, thinning and enlargement are also progressing, and deformation of the polarizing plate is likely to cause display failure of a panel. Specifically, when the polarizing plate is stretched and contracted, the liquid crystal panel attached to the polarizing plate is warped, and the backlight member or the like is deformed to bring the panel into contact with the backlight member, thereby generating light unevenness.
In order to solve this problem, a method of using an optical film made of an acrylic resin having a small photoelastic coefficient (patent document 1) and the like have been proposed.
A retardation film and a polarizing plate which contain an acrylic resin and a styrene resin and have a small photoelastic coefficient and a large retardation have been proposed (patent document 2); contains a styrene-based resin, a retardation film having a large retardation (patent document 3), and the like.
On the other hand, there have been proposed an adhesive layer in which latex is suitably used between a polarizer protective film and a polarizer (patent document 4), and a polarizer protective film having a low moisture permeability in which a transparent base material and a latex layer are combined (patent document 5).
Prior art documents
Patent document
Patent document 1: japanese patent laid-open publication No. 2009-122663
Patent document 2: japanese patent laid-open No. 2008-146003
Patent document 3: japanese patent laid-open No. 2008-185659
Patent document 4: japanese patent No. 4352705
Patent document 5: japanese patent laid-open No. 2008-256747
Disclosure of Invention
Technical problem to be solved by the invention
As a result of intensive studies, it has been found that the acrylic film disclosed in patent document 1 or the acrylic-styrene film disclosed in patent document 2 has insufficient adhesiveness to the polarizing layer, and when processed into a chip shape, peeling or breakage occurs at the end face, so that chipping is likely to occur from the end face of the processed polarizing plate, and the display performance is deteriorated.
The styrene-based thin film disclosed in patent document 3 has insufficient brittleness, and it is difficult to reduce retardation and thus it is known that display performance is deteriorated, because the film thickness needs to be increased in the film formation step.
The latex described in patent document 4 and patent document 5 has a thick film by having a polarizer protective film on the side opposite to the polarizer, and as a result, it is known that light unevenness is likely to occur.
The present invention addresses the problem of providing a polarizing plate that is free from deformation failure and that can suppress light unevenness of a liquid crystal display device that occurs with environmental changes when the polarizing plate is mounted on the liquid crystal display device.
Means for solving the technical problem
In order to improve the optical unevenness of the polarizing plate, a transfer film in which a latex layer is formed as an optical film on a support is prepared, and it has been found that the above-mentioned problems can be solved by laminating the optical film on a polarizer and peeling the support.
Specifically, the above problem can be solved by the following method.
[1]
A method for manufacturing a polarizing plate, comprising the steps of:
forming a latex layer on a base material, and drying the latex layer to produce a transfer film having an optical thin film formed on the base material;
a step of bonding a polarizer to the optical film side surface of the transfer film; and
a step of peeling the base material from the transfer film,
the latex forming the above latex layer was substantially insoluble when mixed with cyclohexanone at 10 wt%,
the surface energy of the base material on the side where the latex layer is formed is 41.0 to 48.0mN/m,
the thickness of the optical film is 1 to 10 μm.
[2]
The method for producing a polarizing plate according to item [1], wherein the polarizer has a protective film on a side opposite to the optical film.
[3]
The method for producing a polarizing plate according to item [1] or [2], wherein the polarizer is formed of a polyvinyl alcohol-based resin.
In order to improve the optical unevenness of the polarizing plate, it is effective to make the optical film of the polarizing plate on the liquid crystal display device side thin, and it is further known that the effect of improving the optical unevenness is remarkable by using a latex layer which is substantially insoluble in cyclohexanone for the optical film. It is presumed that the optical film formed of the latex substantially insoluble in cyclohexanone is less likely to transmit the influence of the ambient temperature/humidity change to the polarizing plate.
Detailed Description
The present invention will be described in detail. The following description of the constituent elements may be made in accordance with a representative embodiment of the present invention, but the present invention is not limited to such an embodiment. In the present specification, "to" are used in the sense of including numerical values described before and after the "to" as a lower limit value and an upper limit value.
< latex >
The latex is a dispersion in which a resin is dispersed in a dispersion medium in the form of particles.
Examples of the dispersion medium include water.
The latex can be selected from acrylic latex, methacrylic latex, and styrene latex. The latex may be a copolymer latex obtained by emulsion polymerization in an aqueous medium in the presence of (d) a polymerization chain transfer agent comprising an α -methylstyrene dimer and another polymerization chain transfer agent in a monomer mixture comprising (a) a diene monomer, (b) a vinyl monomer, and (c) a monomer having 2 or more vinyl groups, acryloyl groups, methacryloyl groups, or allyl groups in 1 or more kinds of molecules.
The diene monomer (a) which is one of the monomers forming the copolymer includes butadiene, isoprene, chloroprene and the like which are conjugated dienes, and butadiene is particularly preferably used.
As the vinyl monomer (b) which is the component 2 of the copolymer, any monomer can be used as long as it is a monomer having an original vinyl group, and preferred examples thereof include styrene, acrylonitrile, methyl methacrylate, vinyl chloride, vinyl acetate and derivatives thereof, alkyl esters of acrylic acid, acrylamide, methacrylamide, acrolein, methacrolein, glycidyl acrylate, glycidyl methacrylate, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, allyl acrylate, allyl methacrylate, N-methylolated acrylamide, N-methylolated methacrylamide, vinyl isocyanate, allyl isocyanate and the like.
Examples of the styrene derivative include methylstyrene, dimethylstyrene, ethylstyrene, diethylstyrene, isopropylstyrene, butylstyrene, hexylstyrene, cyclohexylstyrene, decylstyrene, benzylstyrene, chloromethylstyrene, trifluoromethylstyrene, ethoxymethylstyrene, acetoxymethylstyrene, methoxystyrene, 4-methoxy-3-methylstyrene, dimethoxystyrene, chlorostyrene, dichlorostyrene, trichlorostyrene, tetrachlorostyrene, pentachlorostyrene, bromostyrene, dibromostyrene, iodostyrene, fluorostyrene, trifluorostyrene, 2-bromo-4-trifluoromethylstyrene, 4-fluoro-3-trifluoromethylstyrene, vinylmethyl benzoate, and the like.
Preferable esters among the acrylic acid esters include acrylic acid esters, glycidyl (meth) acrylate, and 2-hydroxyethyl (meth) acrylate.
Examples of the monomer having 2 or more vinyl groups, acryloyl groups, methacryloyl groups or allyl groups in the molecule of the component 3 (c) of the copolymer include so-called crosslinking agents usually added in polymerizing vinyl monomers, such as divinylbenzene, 1, 5-hexadiene-3-yne, hexatriene, divinyl ether, divinyl sulfone, diallyl phthalate, diallyl methanol, diethylene glycol dimethacrylate, trimethylolpropane trimethacrylate and trimethylolpropane dimethacrylate.
The content of the diene monomer (a) in the copolymer is 10 to 60% by mass, particularly preferably 15 to 40% by mass, based on the total amount of the copolymer. (b) The vinyl monomer accounts for 90-40% by mass of the total amount, and the vinyl monomer, especially styrene, accounts for 70-40% by mass of the total amount of copolymerization. (c) The amount of the monomer having 2 or more vinyl groups, acryloyl groups, methacryloyl groups and allyl groups in the molecule is 0.01 to 10% by mass, and particularly preferably 0.1 to 5% by mass, based on the total amount of the diene monomer (a) and the vinyl monomer (b).
The α -methylstyrene dimer in the polymerization chain transfer agent (d) has (A) 2-4-diphenyl-4-methyl-1-pentene, (B) 2-4-diphenyl-4-methyl-2-pentene, and (C) 1-1-3-trimethyl-3-phenylindane as isomers. The α -methylstyrene dimer preferably has a composition in which the component (a) is 40 mass% or more and the component (B) and/or the component (C) is 60 mass% or less, more preferably 50 mass% or more of the component (a) and 50 mass% or less of the component (B) and/or the component (C), and particularly preferably 70 mass% or more of the component (a) and 30 mass% or less of the component (B) and/or the component (C). The chain transfer effect is excellent as the composition ratio of the component (A) increases.
The α -methylstyrene dimer may contain impurities, such as unreacted α -methylstyrene, α -methylstyrene oligomers other than the above components (a), (B) and (C), and α -methylstyrene polymers, within a range not to impair the object of the present invention. When the α -methylstyrene dimer is used, the synthesis can be used in an unpurified state after the α -methylstyrene dimer is synthesized, as long as the object is not impaired.
(d) The proportion of the α -methylstyrene dimer in the polymerization chain transfer agent is 2 to 100% by mass, preferably 3 to 100% by mass, and more preferably 5 to 95% by mass. When the content of the α -methylstyrene dimer is 2% by mass or more, a copolymer latex having excellent adhesive strength and blocking resistance can be obtained, and therefore, the content is preferable. Further, the use of a-methylstyrene dimer together with another polymerization chain transfer agent can improve the reactivity in polymerization.
The amount of the (d) polymerization chain transfer agent used is 0.3 to 10 parts by mass, preferably 0.5 to 7 parts by mass, per 100 parts by mass of the monomer mixture. The amount of the (d) polymerization chain transfer agent used is preferably not less than 0.3 parts by mass because blocking resistance is not poor, and not more than 10 parts by mass because adhesive strength is not lowered. The amount of the α -methylstyrene dimer used is preferably in the range of 0.1 to 5 parts by mass per 100 parts by mass of the monomer mixture.
Next, as another chain transfer agent used together with the α -methylstyrene dimer in the polymerization chain transfer agent (d), a known polymerization chain transfer agent used in general emulsion polymerization can be used. Specific examples thereof include mercaptans such as octyl mercaptan, n-dodecyl mercaptan, t-dodecyl mercaptan, n-hexadecyl mercaptan, n-tetradecyl mercaptan, and t-tetradecyl mercaptan; xanthogen disulfides such as dimethyl xanthogen disulfide, diethyl xanthogen disulfide and diisopropyl xanthogen disulfide; thiuram disulfides such as tetramethylthiuram disulfide, tetraethylthiuram disulfide, tetrabutylthiuram disulfide, and the like; halogenated hydrocarbons such as carbon tetrachloride and ethylene bromide; hydrocarbons such as pentaphenylethane; and acrolein, methacrolein, allyl alcohol, 2-ethylhexyl thioglycolate, terpinolene, alpha-terpinene, gamma-terpinene, dipentene, and the like. They can be used alone or in combination of 2 or more. Among them, thiols, xanthic acid disulfides, thiuram disulfides, carbon tetrachloride and the like can be preferably used.
The copolymer latex can be produced by a conventionally known emulsion polymerization method, except that the monomer mixture and the polymerization chain transfer agent are used. That is, the polymer can be obtained by adding a monomer mixture, a polymerization initiator, an emulsifier, a polymerization chain transfer agent, and the like to an aqueous medium such as water, and carrying out emulsion polymerization.
Preferred specific examples of the latex include styrene-butadiene copolymers, (meth) acrylic acid-styrene-butadiene copolymers, (meth) acrylic acid alkyl ester- (meth) acrylic acid-styrene-butadiene copolymers, and copolymers containing vinyl chloride as the above-mentioned component.
Commercially available latex can be used in the present invention, and examples thereof include Narusuta SR-103 (manufactured by NIPPON A & L INC.), HALEX 202 (manufactured by Asahi Kasei Chemicals Corporation), and VINIBREN 2687 (manufactured by Nissin Chemical Co., Ltd.).
< optical film >
When 10 wt% of cyclohexanone was mixed with the optical film used in the method for producing a polarizing plate of the present invention, a substantially insoluble latex was used. By substantially insoluble, it is meant that the optical film swells in cyclohexanone without free mixing.
Specifically, when the latex is dried, mixed with cyclohexanone in an amount of 10 wt% and left to stand for 24 hours, and then filtered with filter paper, the latex remaining as a filtration residue is called a dissolved latex having a residual ratio of less than 50% relative to the weight of the latex before mixing with cyclohexanone, and the latex having a residual ratio of 50% or more is called a substantially insoluble latex.
The filter paper used for the filtration is not particularly limited, and examples thereof include filter papers such as No.1 and No.5A described in JIS standard P3801.
Such optical films, for example, can be difficult to impart temperature and humidity variations of the environment to the polarizer.
The optical film used in the method for producing a polarizing plate of the present invention has a thickness of 1 to 10 μm, preferably 2 to 8 μm. When the thickness of the optical film is 10 μm or less, optical unevenness can be suppressed, and therefore, it is preferable. When the thickness is 1 μm or more, the optical film is preferably not damaged in the step of peeling the optical film from the substrate.
< substrate >
The surface energy of the substrate used in the method for producing a polarizing plate of the present invention on the side forming the latex layer is 41.0 to 48.0mN/m, and preferably 42.0 to 48.0 mN/m. When the surface energy is 48.0mN/m or less, the substrate can be peeled from the optical film in the step of peeling the substrate from the transfer film, and therefore, it is preferable. And when the surface energy is 41.0mN/m or more, the latex layer formed on the substrate becomes uniform and no failure of the latex layer on the substrate occurs, so that it is preferable.
< method for measuring and calculating surface energy >
The surface energy of the substrate can be calculated by a known method using the Owens method from the contact angles of water and methylene iodide on the substrate surface. For the measurement of the contact angle, for example, DM901(Kyowa Interface Science co., ltd., contact angle meter) can be used.
The base material used in the method for producing a polarizing plate of the present invention can be appropriately selected from known materials. The raw material can be selected from polyester polymers, olefin polymers, cyclic olefin polymers, (meth) acrylic polymers, and cellulose polymers. The substrate used in the method for producing a polarizing plate of the present invention can be appropriately subjected to surface treatment in order to adjust the surface energy on the side where the latex layer is formed. When the surface energy is reduced, for example, corona treatment, normal temperature plasma treatment, saponification treatment, etc. can be performed, and when the surface energy is increased, silicone treatment, fluorine treatment, olefin treatment, etc. can be performed.
The thickness of the base material of the present invention is preferably 5 to 100. mu.m, more preferably 10 to 75 μm, and still more preferably 15 to 55 μm. When the thickness of the substrate is 5 μm or more, since the mechanical strength is not weak, troubles such as curling and buckling do not occur during use, and therefore, it is preferable. Further, when the thickness of the substrate is 100 μm or less, the peeling force at the time of peeling the substrate does not become excessively large, and the optical film is not broken, which is preferable.
< method for manufacturing transfer film >
The transfer film used in the method for producing a polarizing plate of the present invention can be obtained by forming a latex layer on a substrate by a conventional method. Examples of the method for forming the latex layer include a bar coating method, a slit die method, a spray coating method, and a dip coating method.
The latex layer is a coating film formed by applying latex to a base material, and the latex layer is dried, whereby a dispersion medium contained in the latex layer is volatilized, and resin particles are welded to form a film. Thus, the resulting film becomes an optical film.
From the viewpoint of productivity and quality, the method for producing the transfer film of the present invention is preferably a method in which latex is applied to a substrate and dried. The latex can be preferably applied to the substrate by bar coating or slot die coating. The base material may be in the form of a sheet or a roll.
The drying of the latex layer used for producing the transfer film of the present invention can be changed as needed in accordance with the physical properties of the latex used. When the glass transition temperature of the latex is known, it is preferable that the drying temperature of the latex layer is higher than the glass transition temperature by 5 degrees or more.
In view of the film-forming property of the transfer film of the present invention, the latex layer is preferably dried at a predetermined temperature, specifically, preferably 80 to 200 ℃, and more preferably 100 to 140 ℃.
It is preferable that the temperature is 100 ℃ or higher because a film can be formed without stickiness, and it is preferable that the temperature is 140 ℃ or lower because uneven transfer of the latex layer caused by deformation of the base material can be avoided.
< production of polarizing plate >
The optical film obtained above can be used as a protective film for a polarizing plate. The polarizing plate of the present invention can be produced by a known method.
The optical film is preferably subjected to surface treatment (also described in Japanese patent application laid-open Nos. 6-94915 and 6-118232) to hydrophilize the optical film, and is preferably subjected to glow discharge treatment, corona discharge treatment, alkali saponification treatment, or the like. As the surface treatment, corona discharge treatment can be most preferably used.
< polarizer >
As the polarizer, a polarizer made of a polyvinyl alcohol-based resin is preferable, and for example, a polarizer in which a polyvinyl alcohol film is immersed in an iodine solution and stretched can be used. When such a polarizer is used, the surface-treated surface of the optical film used for the polarizing plate of the present invention can be directly bonded to one surface or both surfaces of the polarizer using an adhesive made of an aqueous solution of a polyvinyl alcohol-based resin. As the adhesive, an aqueous solution of polyvinyl alcohol or polyvinyl acetal (e.g., polyvinyl butyral), a latex of a vinyl polymer (e.g., polybutyl acrylate), or an Ultraviolet (UV) curable adhesive can be used, and from the viewpoint of suppressing deformation failure of the polarizing plate, a solution-based adhesive is preferably used, and an aqueous solution of completely saponified polyvinyl alcohol is most preferable.
The thickness of the polarizer of the present invention is preferably 1 to 50 μm, and more preferably 5 to 25 μm. When the thickness of the polarizer is 1 μm or more, the amount of iodine occupied in the polarizer is not increased, the mechanical strength is not lowered, and desired optical characteristics can be obtained, which is preferable. Further, when the thickness of the polarizer is 50 μm or less, the contribution ratio of the polarizer to the stretching and contraction of the polarizing plate due to a change in temperature and humidity is not increased, and the effect of suppressing the optical unevenness of the present invention can be sufficiently obtained, which is preferable.
< protective film >
The optical film may be further bonded to a surface opposite to a surface of the polarizer to which the optical film is bonded, or a conventionally known protective film may be bonded.
The above-mentioned conventionally known protective film is not particularly limited in terms of optical characteristics and materials, and a film containing (or mainly containing) a cellulose ester resin, an acrylic resin and/or a cyclic olefin resin can be preferably used, and an optically isotropic film or an optically anisotropic retardation film can be used.
As the protective film containing a cellulose ester resin, for example, FUJITAC TD40UC (manufactured by fujitlm Corporation) or the like can be used as the conventionally known protective film.
As the above-described conventionally known protective films, as the protective film containing an acrylic resin, an optical film containing a (meth) acrylic resin containing a styrene-based resin described in japanese patent No. 4570042, an optical film containing a (meth) acrylic resin having a glutarimide ring structure described in japanese patent No. 5041532 in the main chain, a protective film containing a (meth) acrylic resin having a lactone ring structure described in japanese patent application laid-open No. 2009-122664, and a protective film containing a (meth) acrylic resin having a glutaric anhydride unit described in japanese patent laid-open No. 2009-139754 can be used.
As the above-described conventionally known protective film, a cyclic olefin resin film described after paragraph [0029] of jp 2009-.
< liquid crystal display device >
The liquid crystal display device of the present invention includes a liquid crystal cell and the polarizing plate of the present invention.
In the liquid crystal display device of the present invention, the optical film can be suitably used even if it is disposed at any position of the inner side of the polarizer (i.e., between the polarizer and the liquid crystal cell) and the outer side (i.e., the surface opposite to the surface on the liquid crystal cell side). In the liquid crystal display device of the present invention, it is preferable that the optical film is disposed between the polarizer and the liquid crystal cell.
Preferably, the liquid crystal display device of the present invention further includes a backlight, and the polarizing plate is disposed on the backlight side or the viewing side. The backlight is not particularly limited, and a known backlight can be used. The liquid crystal display device of the present invention is preferably formed by laminating a backlight, a backlight-side polarizing plate, a liquid crystal cell, and a viewing-side polarizing plate in this order.
As for the other structure, any one of known liquid crystal display devices can be adopted. The Liquid Crystal cell system (mode) is not particularly limited, and various display systems such as a TN (Twisted Nematic) Liquid Crystal cell, an IPS (In-Plane Switching) Liquid Crystal cell, an FLC (Ferroelectric Liquid Crystal) Liquid Crystal cell, an AFLC (antiferroelectric Liquid Crystal) Liquid Crystal cell, an OCB (optically compensated Bend) Liquid Crystal cell, an STN (super Twisted Nematic) Liquid Crystal cell, a VA (vertical alignment) Liquid Crystal cell, and an HAN (Hybrid Aligned Nematic) Liquid Crystal cell can be configured. In the liquid crystal display device of the present invention, the liquid crystal cell is preferably an IPS mode.
As for the other structure, any of known liquid crystal display devices can be adopted.
Examples
The present invention will be further specifically described below with reference to examples. The materials, amounts used, ratios, contents of processes, processing steps and the like shown in the following examples can be appropriately modified without departing from the spirit of the present invention. Therefore, the scope of the present invention is not limited to the specific examples shown below.
< evaluation of solubility of latex in Cyclohexanone >
10mL of each of the latices of Table 1 was added to a 50mL glass container, and dried in an explosion-proof oven (manufactured by Tabai Espec corporation, SPHH-202) at 70 ℃ for 8 hours, thereby obtaining a latex mass. Then, cyclohexanone was added so that the latex mass became 10 wt%, and after covering, the latex was stirred and rotated on a ball mill rotation table for 12 hours, and then the solubility of the latex in cyclohexanone was visually evaluated. The case where the latex pieces swelled in the container was evaluated as "substantially insoluble", and the case where no latex pieces existed in the container was evaluated as "dissolved".
About 1g of the dried latex was taken, cyclohexanone was added to make the latex mass 10 wt%, the latex was covered and then left to stand for 24 hours, and then the latex was filtered under reduced pressure using No.5A filter paper (manufactured by ADVANTEC Corp., diameter 110mm) and a Buchner funnel, and the residue on the filter paper and the filter paper were further washed with 500g of cyclohexanone. The filter paper and the residue were dried in an explosion-proof oven at 120 ℃ for 16 hours while ventilating, and then the mass of the filter paper and the residue were measured.
The weight of the filter paper and the residue used in the filtration and dried was compared with the weight of the filter paper and the latex cake before the filtration, and the residue ratio of the weight of the latex cake was measured. The latex having a weight residual ratio of not less than 50% was evaluated as "substantially insoluble".
The residual ratio is represented by the following formula (1).
The residue ratio (%) (weight of residue after filtration)/(weight of used latex block) × 100
Formula (1)
[ Table 1]
< evaluation of surface energy of substrate >
After the substrates described in table 2 were adjusted at 25 ℃ and a relative humidity of 55% for 2 hours, contact angles with respect to water and methylene iodide were measured on the side of the latex layer forming side using a contact angle meter (DM700, manufactured by Kyowa Interface Science co., ltd.). The surface energy was evaluated using the Owens method.
[ Table 2]
The substrates used in table 2 are as follows.
A4100 PET resin film thickness 75 μm made from Toyobo Co., Ltd
PET resin film thickness 50 μ M manufactured by M5070Daicel Corporation
TD40UC triacetylcellulose resin film thickness 40 μm manufactured by FUJIFILM Corporation (FUJITAC TD40UC)
TR-1 PET resin film thickness 50 μm manufactured by Unitika Ltd
< production of transfer film >
A transfer film having an optical film on a substrate was produced by using the latex selected from table 1 on the substrate selected from table 2, applying the latex by a bar coating method using the combination of the latex and the substrate of table 3 to form a latex layer, and drying at 70 ℃ for 10 minutes.
The film thickness of the optical thin film was set to the film thickness described in the transfer film in table 3.
< production of polarizing plate >
A cellulose acetate film (manufactured by FUJIFILM Corporation, FUJITAC TD40UC) was immersed in a 1.5mol/L aqueous solution of sodium hydroxide (saponified solution) adjusted to 37 ℃ for 1 minute, then washed with water, then immersed in a 0.05mol/L aqueous solution of sulfuric acid for 30 seconds, and then passed through the water-washing bath again. Then, the water removal by the air knife was repeated 3 times, and the water droplets were retained in a drying zone at 70 ℃ for 15 seconds and dried, thereby preparing a protective film which had been subjected to saponification treatment. Then, the optical film side of the transfer film prepared as described above was subjected to corona treatment, thereby producing a transfer film (output 100W, treatment speed 3.2 m/min) which had been subjected to hydrophilization treatment.
< production of polarizer >
According to example 1 of Japanese patent laid-open No. 2001-141926, a polarizer having a thickness of 12 μm was produced by applying a circumferential velocity difference between two pairs of nip rollers and stretching the resultant in the longitudinal direction.
< laminating >
The obtained polarizer, the surface-treated transfer film, and the saponified protective film were used, and the polarizer was sandwiched between them, and then laminated in a roll-to-roll manner using a 3% aqueous solution of polyvinyl alcohol (PVA-117H, manufactured by kuraray co., ltd.) as an adhesive so that the absorption axis of the polarizing layer was parallel to the longitudinal direction of the film. Here, the corona-treated surface of any one of the transfer films described in table 3 of one film of the polarizing layer was set to the polarizing layer side, and the other film was set to the cellulose acetate film.
Subsequently, the transfer film was dried at 70 ℃, and then the substrate was continuously peeled off, followed by applying an adhesive to prepare a polarizing plate.
< evaluation of mounting to liquid Crystal display device (mounting to IPS type liquid Crystal display device) >
As a back-side polarizing plate of an IPS mode liquid crystal television (thin 55-mode liquid crystal television, gap between backlight and cell is 0.5mm), the polarizing plate produced above was bonded to a liquid crystal cell with an adhesive interposed therebetween so that the optical film side produced above was disposed on the liquid crystal cell side. The obtained liquid crystal display was maintained at 50 ℃ and 85% relative humidity for 3 days, and then transferred to an environment at 25 ℃ and 60% relative humidity, and the lighting was maintained in a black display state, and after 48 hours, the liquid crystal display was visually observed to evaluate the light unevenness. (light unevenness level in front direction after durability test)
The unevenness of light (in other words, luminance unevenness) when black display was observed when the device was observed from the front was evaluated by the following criteria.
AA: almost no unevenness was recognized in the illuminance 20lx environment
A: almost no unevenness was recognized in the illuminance 100lx environment
B: slight unevenness was visually recognized in an illuminance of 100lx environment
C: clear unevenness was visually recognized in an illuminance 100lx environment
D: clear unevenness was visually recognized in an illuminance 300lx environment
E: the number of defects was large, and the evaluation of light unevenness of the liquid crystal display device was not possible.
The AA standard, the A standard and the B standard, preferably the AA standard and the A standard, have no problem in practical use.
The evaluation results are summarized in table 3.
[ Table 3]
The transfer film coatability and the substrate releasability were evaluated by the following criteria.
Evaluation of coatability of transfer film
The optical film was uniform with no visible failure in appearance: has no problem
The optical film was not uniform, and a portion without a latex layer was seen on the substrate: repellent latex
The evaluation of "no problem" was made as no problem in the quality of the polarizing plate.
Evaluation of releasability of substrate
In the polarizing plate after peeling the substrate, no defect was seen on the optical film: has no problem
In the polarizing plate after peeling the substrate, cracks were seen on the optical film: the optical film is destroyed
The evaluation of "no problem" was made as no problem in the quality of the polarizing plate.
From table 3, it is understood that the polarizing plate obtained by the method for producing a polarizing plate of the present invention has less distortion failure, and can suppress light unevenness of the liquid crystal display device caused by environmental changes when the polarizing plate is mounted on the liquid crystal display device.
Industrial applicability
According to the present invention, it is possible to provide a polarizing plate which is free from deformation failure and can suppress light unevenness of a liquid crystal display device caused by environmental changes when the polarizing plate is mounted on the liquid crystal display device.
The present invention has been described in detail with reference to specific embodiments, and it is apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the present invention.
The present application is based on Japanese patent application laid out on 5/2/2016 (Japanese patent application No. 2016-.
Claims (3)
1. A method for manufacturing a polarizing plate, comprising the steps of:
forming a latex layer on a base material, and drying the latex layer to produce a transfer film having an optical thin film formed on the base material;
a step of attaching a polarizer to the surface of the transfer film on the side of the optical film; and
a step of peeling the base material from the transfer film,
the latex forming the latex layer did not substantially dissolve when mixed with cyclohexanone at 10 wt%,
the surface energy of the base material on the side where the latex layer is formed is 41.0-48.0 mN/m,
the thickness of the optical film is 1 to 10 μm,
the term "substantially insoluble" means that when the latex is dried, mixed with cyclohexanone in an amount of 10 wt% and left for 24 hours, and then filtered with filter paper, the weight of the latex remaining as a filtration residue is 50% or more of the weight of the latex before mixing with cyclohexanone.
2. The polarizing plate production method according to claim 1, wherein,
the polarizer is provided with a protective film on the side opposite to the optical film.
3. The method for manufacturing a polarizing plate according to claim 1 or 2,
the polarizer is formed of a polyvinyl alcohol-based resin.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016020819 | 2016-02-05 | ||
| JP2016-020819 | 2016-02-05 | ||
| JP2016-250145 | 2016-12-22 | ||
| JP2016250145A JP6637879B2 (en) | 2016-02-05 | 2016-12-22 | Manufacturing method of polarizing plate |
| PCT/JP2017/003815 WO2017135378A1 (en) | 2016-02-05 | 2017-02-02 | Polarization plate manufacturing method |
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| Publication Number | Publication Date |
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| CN108603967A CN108603967A (en) | 2018-09-28 |
| CN108603967B true CN108603967B (en) | 2020-08-21 |
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| CN201780009259.4A Active CN108603967B (en) | 2016-02-05 | 2017-02-02 | Method for manufacturing polarizing plate |
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| JP (1) | JP6637879B2 (en) |
| KR (1) | KR102101687B1 (en) |
| CN (1) | CN108603967B (en) |
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| JP6637879B2 (en) * | 2016-02-05 | 2020-01-29 | 富士フイルム株式会社 | Manufacturing method of polarizing plate |
| WO2019098159A1 (en) * | 2017-11-15 | 2019-05-23 | 富士フイルム株式会社 | Method for manufacturing polarizing plate, method for manufacturing liquid crystal display device, and optical film |
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| CN101151306A (en) * | 2005-02-01 | 2008-03-26 | 埃西勒国际通用光学公司 | Process for applying a coating onto a surface of a lens substrate |
| JP2015096579A (en) * | 2013-11-15 | 2015-05-21 | 日東電工株式会社 | Water dispersion type adhesive composition for optical film, adhesive layer, adhesive optical film and image display device |
| CN104765091A (en) * | 2015-02-13 | 2015-07-08 | 厦门天马微电子有限公司 | Converting film, manufacturing method thereof, electronic device and manufacturing method of electronic device |
| CN108603967A (en) * | 2016-02-05 | 2018-09-28 | 富士胶片株式会社 | The manufacturing method of polarizing film |
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| JP2983734B2 (en) * | 1991-12-24 | 1999-11-29 | ダイセル化学工業株式会社 | Polystyrene resin film |
| US6630289B1 (en) * | 2000-08-22 | 2003-10-07 | The Hong Kong University Of Science And Technology | Photo-patterned light polarizing films |
| JP4352705B2 (en) * | 2003-01-14 | 2009-10-28 | コニカミノルタホールディングス株式会社 | Polarizing plate protective film, polarizing plate and liquid crystal display device using the same |
| JP4586511B2 (en) * | 2004-11-25 | 2010-11-24 | テクノポリマー株式会社 | Thermoplastic resin composition and molded article |
| JP5057807B2 (en) * | 2006-09-14 | 2012-10-24 | 旭化成イーマテリアルズ株式会社 | Retardation film containing acrylic resin and styrene resin |
| JP5191667B2 (en) * | 2007-01-29 | 2013-05-08 | 旭化成イーマテリアルズ株式会社 | Styrene resin anisotropic film |
| JP2008256747A (en) * | 2007-03-30 | 2008-10-23 | Fujifilm Corp | Protection film for polarizing plate, its manufacturing method, polarizing plate and liquid crystal display device |
| CN101836139B (en) * | 2007-10-22 | 2013-03-13 | 日东电工株式会社 | Polarizing plate, method for producing the same, optical film and image display device |
| JP5477211B2 (en) * | 2010-07-23 | 2014-04-23 | 大日本印刷株式会社 | Polarized sheet laminate |
| JP2013141820A (en) * | 2012-01-12 | 2013-07-22 | Toagosei Co Ltd | Production process of optical film or sheet |
| WO2014199934A1 (en) * | 2013-06-10 | 2014-12-18 | 富士フイルム株式会社 | Polarizing plate, method for producing polarizing plate, transfer material for production of polarizing plate, and transfer material |
| JP6699133B2 (en) * | 2015-10-30 | 2020-05-27 | コニカミノルタ株式会社 | Optical film and manufacturing method thereof |
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- 2016-12-22 JP JP2016250145A patent/JP6637879B2/en active Active
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- 2017-02-02 CN CN201780009259.4A patent/CN108603967B/en active Active
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101151306A (en) * | 2005-02-01 | 2008-03-26 | 埃西勒国际通用光学公司 | Process for applying a coating onto a surface of a lens substrate |
| JP2015096579A (en) * | 2013-11-15 | 2015-05-21 | 日東電工株式会社 | Water dispersion type adhesive composition for optical film, adhesive layer, adhesive optical film and image display device |
| CN104765091A (en) * | 2015-02-13 | 2015-07-08 | 厦门天马微电子有限公司 | Converting film, manufacturing method thereof, electronic device and manufacturing method of electronic device |
| CN108603967A (en) * | 2016-02-05 | 2018-09-28 | 富士胶片株式会社 | The manufacturing method of polarizing film |
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| KR20180097716A (en) | 2018-08-31 |
| JP2017142489A (en) | 2017-08-17 |
| JP6637879B2 (en) | 2020-01-29 |
| KR102101687B1 (en) | 2020-04-17 |
| CN108603967A (en) | 2018-09-28 |
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