WO2009090932A1 - 偏光板および偏光板を用いた画像表示装置 - Google Patents
偏光板および偏光板を用いた画像表示装置 Download PDFInfo
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- WO2009090932A1 WO2009090932A1 PCT/JP2009/050289 JP2009050289W WO2009090932A1 WO 2009090932 A1 WO2009090932 A1 WO 2009090932A1 JP 2009050289 W JP2009050289 W JP 2009050289W WO 2009090932 A1 WO2009090932 A1 WO 2009090932A1
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- WIPO (PCT)
- Prior art keywords
- polarizing plate
- easy
- protective film
- resin
- acid
- Prior art date
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Images
Classifications
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- 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
- G02B5/305—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 including organic materials, e.g. polymeric layers
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- G—PHYSICS
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- 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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/08—Processes
- C08G18/0804—Manufacture of polymers containing ionic or ionogenic groups
- C08G18/0819—Manufacture of polymers containing ionic or ionogenic groups containing anionic or anionogenic groups
- C08G18/0823—Manufacture of polymers containing ionic or ionogenic groups containing anionic or anionogenic groups containing carboxylate salt groups or groups forming them
-
- 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
- C09J129/00—Adhesives based on 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; Adhesives based on hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Adhesives based on derivatives of such polymers
- C09J129/02—Homopolymers or copolymers of unsaturated alcohols
- C09J129/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
-
- 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
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
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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
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
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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
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
-
- 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
- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/318—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of liquid crystal displays
-
- 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
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
- C09J2301/302—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier the adhesive being pressure-sensitive, i.e. tacky at temperatures inferior to 30°C
Definitions
- the present invention relates to a polarizing plate and an image display device using the polarizing plate.
- this invention relates to the polarizing plate excellent in the adhesiveness of a polarizer and a protective film.
- a liquid crystal display device which is a typical image display device
- the polarizing plate is usually formed by attaching a protective film to both surfaces of a polarizer using an adhesive.
- An acrylic resin has been proposed as a protective film forming material.
- adhesion between the polarizer and the protective film is not sufficient.
- the present invention has been made to solve the above-described conventional problems, and a main purpose thereof is to provide a polarizing plate excellent in adhesion between a polarizer and a protective film (particularly under high temperature and high humidity). There is.
- the polarizing plate of the present invention includes a polarizer, an adhesive layer, an easy-adhesive layer formed of an easy-adhesive composition containing a urethane resin having a carboxyl group and a crosslinking agent, and a (meth) acrylic resin. And a protective film.
- the adhesive layer is formed of an adhesive composition containing an acetoacetyl group-containing polyvinyl alcohol resin.
- the easy-adhesion layer is obtained by drying the easy-adhesive composition at 90 ° C. or higher.
- corona discharge treatment or plasma treatment is performed on the side of the protective film where the polarizer is disposed.
- the crosslinking agent is an acrylic polymer having an oxazoline group.
- an image display device includes the polarizing plate.
- a liquid crystal display device includes a liquid crystal cell and the polarizing plate disposed on at least one side of the liquid crystal cell.
- an easy-adhesion layer with an easy-adhesive composition containing a urethane resin having a carboxyl group and a crosslinking agent, adhesion between the polarizer and the protective film (particularly under high temperature and high humidity)
- the polarizing plate excellent in (1) can be provided.
- Such knowledge was obtained only when a polarizing plate having an easy-adhesion layer formed of an easy-adhesive composition containing a urethane resin having a carboxyl group and a crosslinking agent was actually subjected to high temperature and high humidity. It is an unexpected and excellent effect.
- FIG. 1 is a schematic cross-sectional view of a polarizing plate according to one preferred embodiment of the present invention.
- A. 1 is a schematic sectional view of a polarizing plate according to a preferred embodiment of the present invention.
- the polarizing plate 10 includes a polarizer 11, an adhesive layer 12, an easy-adhesion layer 13, and a protective film 14 in this order.
- the polarizing plate 10 has a second protective film attached to the side of the polarizer 11 opposite to the protective film 14 via an adhesive layer.
- Polarizer 11 Any appropriate polarizer may be employed as the polarizer 11 depending on the purpose.
- dichroic substances such as iodine and dichroic dyes are adsorbed on hydrophilic polymer films such as polyvinyl alcohol films, partially formalized polyvinyl alcohol films, and ethylene / vinyl acetate copolymer partially saponified films.
- polyene-based oriented films such as a uniaxially stretched product, a polyvinyl alcohol dehydrated product and a polyvinyl chloride dehydrochlorinated product.
- a polarizer obtained by adsorbing a dichroic substance such as iodine on a polyvinyl alcohol film and uniaxially stretching is particularly preferable because of its high polarization dichroic ratio.
- the thickness of these polarizers is not particularly limited, but is generally about 1 to 80 ⁇ m.
- a polarizer uniaxially stretched by adsorbing iodine to a polyvinyl alcohol film can be produced, for example, by dyeing polyvinyl alcohol in an aqueous iodine solution and stretching it 3 to 7 times the original length. . If necessary, it may contain boric acid, zinc sulfate, zinc chloride or the like, or may be immersed in an aqueous solution such as potassium iodide. Further, if necessary, the polyvinyl alcohol film may be immersed in water and washed before dyeing.
- Stretching may be performed after dyeing with iodine, may be performed while dyeing, or may be dyed with iodine after stretching.
- the film can be stretched in an aqueous solution of boric acid or potassium iodide or in a water bath.
- Adhesive Layer Any appropriate adhesive can be adopted as the adhesive forming the adhesive layer 12.
- the adhesive layer 12 is formed from an adhesive composition containing a polyvinyl alcohol-based resin.
- the polyvinyl alcohol resin examples include a polyvinyl alcohol resin and an acetoacetyl group-containing polyvinyl alcohol resin.
- it is an acetoacetyl group-containing polyvinyl alcohol resin. This is because the adhesion between the polarizer and the protective film can be further improved and the durability can be improved.
- polyvinyl alcohol resin examples include a saponified product of polyvinyl acetate, a derivative of the saponified product; a saponified product of a copolymer with vinyl acetate and a monomer having copolymerizability; Examples thereof include modified polyvinyl alcohols that have been converted into ethers, ethers, grafts, or phosphoric esters.
- Examples of the monomer include unsaturated carboxylic acids such as (anhydrous) maleic acid, fumaric acid, crotonic acid, itaconic acid, (meth) acrylic acid, and esters thereof; ⁇ -olefins such as ethylene and propylene; (Meth) allyl sulfonic acid (soda), sulfonic acid soda (monoalkyl malate), disulfonic acid soda alkyl maleate, N-methylol acrylamide, acrylamide alkyl sulfonic acid alkali salt, N-vinyl pyrrolidone, N-vinyl pyrrolidone derivatives, etc. Can be mentioned. These resins can be used alone or in combination of two or more.
- unsaturated carboxylic acids such as (anhydrous) maleic acid, fumaric acid, crotonic acid, itaconic acid, (meth) acrylic acid, and esters thereof
- ⁇ -olefins such as ethylene and prop
- the average degree of polymerization of the polyvinyl alcohol resin is preferably about 100 to 5000, more preferably 1000 to 4000 from the viewpoint of adhesiveness.
- the average degree of saponification is preferably about 85 to 100 mol%, more preferably 90 to 100 mol% from the viewpoint of adhesiveness.
- the acetoacetyl group-containing polyvinyl alcohol resin can be obtained, for example, by reacting a polyvinyl alcohol resin with diketene by an arbitrary method.
- a method of directly contacting a diketene gas or liquid diketene with a polyvinyl alcohol resin can be obtained, for example, by reacting a polyvinyl alcohol resin with diketene by an arbitrary method.
- the acetoacetyl group modification degree of the acetoacetyl group-containing polyvinyl alcohol resin is typically 0.1 mol% or more, preferably about 0.1 to 40 mol%, more preferably 1 to 20%, particularly Preferably, it is 2 to 7 mol%. If it is less than 0.1 mol%, the water resistance may be insufficient. If it exceeds 40 mol%, the effect of improving water resistance is small.
- the degree of acetoacetyl group modification is a value measured by NMR.
- the adhesive composition may contain a crosslinking agent.
- Arbitrary appropriate crosslinking agents can be employ
- a compound having at least two functional groups reactive with the polyvinyl alcohol resin is preferable.
- amino-formaldehyde resins and dialdehydes are preferred.
- Amino -.. Preferably a compound having a methylol group as a formaldehyde resin, the dialdehydes are preferred glyoxal Of these compounds having a methylol group is preferable, and methylol melamine is particularly preferred.
- the blending amount of the cross-linking agent can be appropriately set according to the type of the polyvinyl alcohol resin. Typically, the amount is about 10 to 60 parts by weight, preferably 20 to 50 parts by weight with respect to 100 parts by weight of the polyvinyl alcohol resin. This is because the adhesiveness can be excellent.
- reaction of a crosslinking agent advances in a short time, and there exists a tendency for an adhesive agent to gelatinize. As a result, the usable time (pot life) as an adhesive becomes extremely short, and industrial use may be difficult.
- the adhesive composition may include a metal compound colloid.
- the metal compound colloid can be one in which metal compound fine particles are dispersed in a dispersion medium, and can be electrostatically stabilized due to mutual repulsion of the same kind of charge of the fine particles, and can have permanent stability. .
- an adhesive composition having excellent stability can be obtained even when the amount of the crosslinking agent is large.
- the average particle diameter of the fine particles forming the metal compound colloid can be any appropriate value as long as it does not adversely affect the optical characteristics such as polarization characteristics.
- the thickness is preferably 1 to 100 nm, more preferably 1 to 50 nm. This is because the fine particles can be uniformly dispersed in the adhesive layer, the adhesion can be ensured, and the occurrence of knick defects can be suppressed. “Knick defect” means light leakage.
- metal compound any appropriate compound can be adopted as the metal compound.
- metal oxides such as alumina, silica, zirconia and titania
- metal salts such as aluminum silicate, calcium carbonate, magnesium silicate, zinc carbonate, barium carbonate and calcium phosphate
- minerals such as celite, talc, clay and kaolin It is done.
- a metal compound colloid having a positive charge is preferably used in the present invention.
- the metal compound include alumina and titania, and alumina is particularly preferable.
- the metal compound colloid is typically present in the state of a colloid solution dispersed in a dispersion medium.
- the dispersion medium include water and alcohols.
- the solid content concentration in the colloidal solution is typically about 1 to 50% by weight, preferably 1 to 30% by weight.
- the colloidal solution can contain acids such as nitric acid, hydrochloric acid, acetic acid as stabilizers.
- the amount of the metal compound colloid (solid content) is preferably 200 parts by weight or less, more preferably 10 to 200 parts by weight, still more preferably 20 to 175 parts by weight, based on 100 parts by weight of the polyvinyl alcohol resin. Most preferred is 30 to 150 parts by weight. This is because the occurrence of knick defects can be suppressed while ensuring the adhesiveness.
- the adhesive composition includes a coupling agent such as a silane coupling agent and a titanium coupling agent, various tackifiers, an ultraviolet absorber, an antioxidant, a heat stabilizer, a hydrolysis stabilizer, and the like. May be included.
- a coupling agent such as a silane coupling agent and a titanium coupling agent
- various tackifiers such as an ultraviolet absorber, an antioxidant, a heat stabilizer, a hydrolysis stabilizer, and the like. May be included.
- the form of the adhesive composition is preferably an aqueous solution (resin solution).
- the resin concentration is preferably from 0.1 to 15% by weight, more preferably from 0.5 to 10% by weight, from the viewpoints of coatability and storage stability.
- the viscosity of the resin solution is preferably 1 to 50 mPa ⁇ s. In the case where the metal compound colloid is included, the occurrence of knick defects can be effectively suppressed even in the low viscosity range of 1 to 20 mPa ⁇ s.
- the pH of the resin solution is preferably 2 to 6, more preferably 2.5 to 5, further preferably 3 to 5, and most preferably 3.5 to 4.5.
- the surface charge of the metal compound colloid can be controlled by adjusting the pH.
- the surface charge is preferably a positive charge. By having a positive charge, generation of nick defects can be further suppressed. The surface charge can be confirmed, for example, by measuring the zeta potential with a zeta potential measuring device.
- any appropriate method can be adopted as a method for preparing the resin solution.
- the crosslinking agent and the metal compound colloid are included, for example, a method of blending the metal compound colloid with a polyvinyl alcohol resin and a crosslinking agent mixed in advance and adjusted to an appropriate concentration can be mentioned.
- a crosslinking agent can also be mixed considering the time of use etc.
- the concentration of the resin solution may be adjusted after preparing the resin solution.
- the thickness of the adhesive layer formed from the adhesive composition can be set to any appropriate value depending on the composition of the adhesive composition and the like.
- the thickness is preferably 10 to 300 nm, more preferably 10 to 200 nm, and particularly preferably 20 to 150 nm. It is because sufficient adhesive force can be obtained.
- the easy-adhesion layer 13 is formed of an easy-adhesive composition containing a urethane resin having a carboxyl group and a crosslinking agent.
- a urethane resin having a carboxyl group and a crosslinking agent By forming the easy-adhesion layer with such an easy-adhesive composition, it is possible to provide a polarizing plate having excellent adhesion between the polarizer and the protective film (particularly under high temperature and high humidity). Moreover, the easily bonding layer excellent in adhesiveness with a protective film can be obtained by using a urethane resin.
- the easy-adhesive composition is preferably aqueous. The aqueous system is superior to the solvent system in terms of environment and can be excellent in workability.
- the urethane resin is typically obtained by reacting a polyol and a polyisocyanate.
- the polyol is not particularly limited as long as it has two or more hydroxyl groups in the molecule, and any suitable polyol can be adopted.
- polyacryl polyol, polyester polyol, polyether polyol and the like can be mentioned. These may be used alone or in combination of two or more.
- the polyacryl polyol is typically obtained by copolymerizing a (meth) acrylic ester and a monomer having a hydroxyl group.
- (meth) acrylic acid esters include methyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, cyclohexyl (meth) acrylate, and the like.
- the monomer having a hydroxyl group include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, and 2-hydroxy (meth) acrylate.
- Hydroxyalkyl esters of (meth) acrylic acid such as butyl, 4-hydroxybutyl (meth) acrylate, 2-hydroxypentyl (meth) acrylate; mono (meth) acrylic acid of polyhydric alcohols such as glycerin and trimethylolpropane Ester; N-methylol (meth) acrylamide and the like. These may be used alone or in combination of two or more.
- the polyacryl polyol may be copolymerized with other monomers in addition to the monomer components.
- any appropriate monomer can be adopted as long as copolymerization is possible.
- unsaturated monocarboxylic acids such as (meth) acrylic acid; unsaturated dicarboxylic acids such as maleic acid and anhydrides and mono- or diesters thereof; unsaturated nitriles such as (meth) acrylonitrile; (meth) Unsaturated amides such as acrylamide and N-methylol (meth) acrylamide; Vinyl esters such as vinyl acetate and vinyl propionate; Vinyl ethers such as methyl vinyl ether; ⁇ -olefins such as ethylene and propylene; Vinyl chloride and vinylidene chloride And halogenated ⁇ , ⁇ -unsaturated aliphatic monomers such as styrene and ⁇ - ⁇ -unsaturated aromatic monomers such as ⁇ -methylstyrene.
- the polyester polyol is typically obtained by reacting a polybasic acid component and a polyol component.
- the polybasic acid component include orthophthalic acid, isophthalic acid, terephthalic acid, 1,4-naphthalenedicarboxylic acid, 2,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, biphenyldicarboxylic acid, tetrahydrophthalic acid, etc.
- Aromatic dicarboxylic acids oxalic acid, succinic acid, malonic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, decanedicarboxylic acid, dodecanedicarboxylic acid, octadecanedicarboxylic acid, tartaric acid, alkylsuccinic acid
- Aliphatic dicarboxylic acids such as linolenic acid, maleic acid, fumaric acid, mesaconic acid, citraconic acid, itaconic acid; hexahydrophthalic acid, tetrahydrophthalic acid, 1,3-cyclohexanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, etc.
- polyol component examples include ethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,3-butanediol, 1,4-butanediol, neopentyl glycol, pentanediol, and 1,6-hexanediol.
- the polyether polyol is typically obtained by adding an alkylene oxide to a polyhydric alcohol by ring-opening polymerization.
- the polyhydric alcohol include ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, glycerin, trimethylolpropane, and the like.
- the alkylene oxide include ethylene oxide, propylene oxide, butylene oxide, styrene oxide, and tetrahydrofuran. These may be used alone or in combination of two or more.
- polyisocyanate examples include tetramethylene diisocyanate, dodecamethylene diisocyanate, 1,4-butane diisocyanate, hexamethylene diisocyanate, 2,2,4-trimethylhexamethylene diisocyanate, 2,4,4-trimethylhexamethylene diisocyanate, and lysine.
- Aliphatic diisocyanates such as diisocyanate, 2-methylpentane-1,5-diisocyanate, 3-methylpentane-1,5-diisocyanate; isophorone diisocyanate, hydrogenated xylylene diisocyanate, 4,4'-cyclohexylmethane diisocyanate, 1,4 -Alicyclic rings such as cyclohexane diisocyanate, methylcyclohexylene diisocyanate, 1,3-bis (isocyanatomethyl) cyclohexane Diisocyanate; tolylene diisocyanate, 2,2'-diphenylmethane diisocyanate, 2,4'-diphenylmethane diisocyanate, 4,4'-diphenylmethane diisocyanate, 4,4'-diphenyldimethylmethane diisocyanate, 4,4'-dibenzyl diisocyanate, 1 ,
- the urethane resin has a carboxyl group.
- the urethane resin having a carboxyl group can be obtained, for example, by reacting a chain extender having a free carboxyl group in addition to the polyol and the polyisocyanate.
- Examples of the chain extender having a free carboxyl group include dihydroxycarboxylic acid and dihydroxysuccinic acid.
- dihydroxycarboxylic acid examples include dialkylolalkanoic acids such as dimethylolalkanoic acid (for example, dimethylolacetic acid, dimethylolbutanoic acid, dimethylolpropionic acid, dimethylolbutyric acid, dimethylolpentanoic acid). These may be used alone or in combination of two or more.
- dimethylolalkanoic acid for example, dimethylolacetic acid, dimethylolbutanoic acid, dimethylolpropionic acid, dimethylolbutyric acid, dimethylolpentanoic acid.
- polystyrene resin in addition to the above components, other polyols and other chain extenders can be reacted.
- other polyols include sorbitol, 1,2,3,6-hexanetetraol, 1,4-sorbitan, 1,2,4-butanetriol, 1,2,5-pentanetriol, glycerin, and trimethylol.
- polyols having 3 or more hydroxyl groups such as ethane, trimethylolpropane and pentaerythritol.
- chain extenders examples include ethylene glycol, diethylene glycol, triethylene glycol, 1,3-propanediol, 1,3-butanediol, 1,4-butanediol, neopentyl glycol, pentanediol, 1,6 -Glycols such as hexanediol and propylene glycol; aliphatic diamines such as ethylenediamine, propylenediamine, hexamethylenediamine, 1,4-butanediamine and aminoethylethanolamine; isophoronediamine, 4,4'-dicyclohexylmethanediamine and the like Alicyclic diamines; and aromatic diamines such as xylylenediamine and tolylenediamine.
- any appropriate method can be adopted as the method for producing the urethane resin.
- Specific examples include a one-shot method in which the above components are reacted at once and a multi-stage method in which the components are reacted in stages.
- the urethane resin has a carboxyl group, it is preferably a multistage method. This is because a carboxyl group can be easily introduced.
- any suitable urethane reaction catalyst can be used.
- a neutralizing agent is preferably used in the production of the urethane resin.
- a neutralizing agent By using a neutralizing agent, the stability of the urethane resin in water can be improved.
- the neutralizing agent include ammonia, N-methylmorpholine, triethylamine, dimethylethanolamine, methyldiethanolamine, triethanolamine, morpholine, tripropylamine, ethanolamine, triisopropanolamine, 2-amino-2-methyl-1 -Propanol and the like. These may be used alone or in combination of two or more.
- an organic solvent that is inert to the polyisocyanate and compatible with water is preferably used in the production of the urethane resin.
- the organic solvent include ester solvents such as ethyl acetate, butyl acetate, and ethyl cellosolve acetate; ketone solvents such as acetone, methyl ethyl ketone, and methyl isobutyl ketone; ether solvents such as dioxane, tetrahydrofuran, and propylene glycol monomethyl ether.
- a solvent etc. are mentioned. These may be used alone or in combination of two or more.
- the number average molecular weight of the urethane resin is preferably 5,000 to 600,000, more preferably 10,000 to 400,000.
- the acid value of the urethane resin is preferably 10 or more, more preferably 10 to 50, and particularly preferably 20 to 45. When the acid value is within such a range, the adhesion between the polarizer and the protective film can be more excellent.
- any appropriate crosslinking agent that can react with a carboxyl group can be adopted as the crosslinking agent.
- a polymer having a group capable of reacting with a carboxyl group is used.
- the group that can react with a carboxyl group include an organic amino group, an oxazoline group, an epoxy group, and a carbodiimide group.
- the crosslinking agent has an oxazoline group.
- the crosslinking agent having an oxazoline group has a long pot life at the time of mixing with the urethane resin, and has a good workability because the crosslinking reaction proceeds by heating.
- any appropriate polymer can be adopted as the polymer.
- examples thereof include acrylic polymers and styrene / acrylic polymers.
- An acrylic polymer is preferable.
- an acrylic polymer By using an acrylic polymer, the adhesion between the polarizer and the protective film can be further improved. Moreover, it can be stably compatible with an aqueous easy-to-adhesive composition and can be well crosslinked with the urethane resin.
- the above easy-adhesive composition may further contain any appropriate additive.
- additives include anti-blocking agents, dispersion stabilizers, thixotropic agents, antioxidants, ultraviolet absorbers, antifoaming agents, thickeners, dispersants, surfactants, catalysts, fillers, lubricants, and antistatic agents. Agents and the like.
- the easy-adhesive composition is preferably aqueous.
- the concentration of the urethane resin in the easy-adhesive composition is preferably 20 to 50% by weight, more preferably 25 to 45% by weight. This is because the workability at the time of forming the easy adhesion layer can be excellent.
- the content of the crosslinking agent in the easy-adhesive composition is preferably 1 to 30 parts by weight, more preferably 3 to 20 parts by weight with respect to 100 parts by weight of the urethane resin. By setting it as 1 weight part or more, it can be excellent in adhesiveness of a polarizer and a protective film. On the other hand, by setting it as 30 weight part or less, it can suppress that a phase difference expresses in an easily bonding layer. In addition, the formation method of an easily bonding layer is mentioned later by B term.
- the thickness of the easy-adhesion layer can be set to any appropriate value.
- the thickness is preferably 0.1 to 10 ⁇ m, more preferably 0.1 to 5 ⁇ m, and particularly preferably 0.2 to 1.5 ⁇ m. By setting to such a range, it can be excellent in the adhesiveness of a polarizer and a protective film, and can suppress that a phase difference expresses in an easily bonding layer.
- the protective film 14 contains a (meth) acrylic resin.
- the protective film is obtained, for example, by molding a molding material containing a resin component containing a (meth) acrylic resin as a main component by extrusion molding.
- Tg glass transition temperature
- the said protective film can become the thing excellent in durability by including (meth) acrylic-type resin whose Tg (glass transition temperature) is 115 degreeC or more as a main component.
- the upper limit value of Tg of the (meth) acrylic resin is not particularly limited, but is preferably 170 ° C. or less from the viewpoint of moldability and the like.
- any appropriate (meth) acrylic resin can be adopted as the (meth) acrylic resin.
- poly (meth) acrylate such as polymethyl methacrylate, methyl methacrylate- (meth) acrylic acid copolymer, methyl methacrylate- (meth) acrylic acid ester copolymer, methyl methacrylate-acrylic acid ester -(Meth) acrylic acid copolymer, (meth) acrylic acid methyl-styrene copolymer (MS resin, etc.), polymer having alicyclic hydrocarbon group (for example, methyl methacrylate-cyclohexyl methacrylate copolymer) And methyl methacrylate- (meth) acrylate norbornyl copolymer).
- poly (meth) acrylate such as polymethyl methacrylate, methyl methacrylate- (meth) acrylic acid copolymer, methyl methacrylate- (meth) acrylic acid ester copolymer, methyl methacrylate-acrylic acid
- poly (meth) acrylate C 1-6 alkyl such as poly (meth) acrylate methyl is used. More preferred is a methyl methacrylate resin containing methyl methacrylate as a main component (50 to 100% by weight, preferably 70 to 100% by weight).
- the (meth) acrylic resin examples include, for example, Acrypet VH and Acrypet VRL20A manufactured by Mitsubishi Rayon Co., Ltd., and a high Tg (meth) acrylic resin obtained by intramolecular crosslinking or intramolecular cyclization reaction. It is done.
- the (meth) acrylic resin has a (meth) acrylic resin having a glutaric anhydride structure and a lactone ring structure in that it has high heat resistance, high transparency, and high mechanical strength.
- (Meth) acrylic resins and (meth) acrylic resins having a glutarimide structure are preferred.
- the glutaric anhydride structure As the (meth) acrylic resin having a glutaric anhydride structure, the glutaric anhydride structure described in JP-A-2006-283013, JP-A-2006-335902, JP-A-2006-274118, or the like is used.
- the (meth) acrylic resin which has is mentioned.
- Examples of the (meth) acrylic resin having a lactone ring structure include JP 2000-230016, JP 2001-151814, JP 2002-120326, JP 2002-254544, and JP 2005. Examples thereof include (meth) acrylic resins having a lactone ring structure described in Japanese Patent No. 146084.
- Examples of the (meth) acrylic resin having a glutarimide structure include JP-A-2006-309033, JP-A-2006-317560, JP-A-2006-328329, JP-A-2006-328334, and JP-A-2006-.
- the content of the (meth) acrylic resin in the protective film is preferably 50 to 100% by weight, more preferably 50 to 99% by weight, still more preferably 60 to 98% by weight, particularly preferably 70 to 97% by weight. It is. When the content of the (meth) acrylic resin in the protective film is less than 50% by weight, the high heat resistance and high transparency inherent in the (meth) acrylic resin may not be sufficiently reflected.
- the content of the (meth) acrylic resin in the molding material used for molding the protective film is preferably 50 to 100% by weight, more preferably 50 to 99% by weight, and still more preferably 60 to 98% by weight. Particularly preferred is 70 to 97% by weight.
- the content of the (meth) acrylic resin in the molding material used for molding the protective film is less than 50% by weight, the (meth) acrylic resin originally has high heat resistance and high transparency. There is a risk that it cannot be fully reflected.
- the protective film may contain other thermoplastic resins in addition to the (meth) acrylic resin.
- Other thermoplastic resins include, for example, olefin polymers such as polyethylene, polypropylene, ethylene-propylene copolymer, poly (4-methyl-1-pentene); vinyl chloride, vinylidene chloride, chlorinated vinyl resins, etc.
- Vinyl halide polymers acrylic polymers such as polymethyl methacrylate; styrene polymers such as polystyrene, styrene-methyl methacrylate copolymer, styrene-acrylonitrile copolymer, acrylonitrile-butadiene-styrene block copolymer
- Polyesters such as polyethylene terephthalate, polybutylene terephthalate and polyethylene naphthalate; polyamides such as nylon 6, nylon 66 and nylon 610; polyacetals; polycarbonates; polyphenylene oxides; ; Polyether ether ketone; polysulfones; polyethersulfones; polyoxyethylene benzylidene alkylene; polyamideimide; polybutadiene rubber, rubber-like polymer such as ABS resin or ASA resin containing an acrylic rubber.
- the content of other thermoplastic resin in the protective film is preferably 0 to 50% by weight, more preferably 0 to 40% by weight, still more preferably 0 to 30% by weight, and particularly preferably 0 to 20% by weight.
- the protective film may contain an additive.
- additives include hindered phenol-based, phosphorus-based and sulfur-based antioxidants; light-resistant stabilizers, weather-resistant stabilizers, heat stabilizers and other stabilizers; reinforcing materials such as glass fibers and carbon fibers; phenyls UV absorbers such as salicylate, (2,2′-hydroxy-5-methylphenyl) benzotriazole, 2-hydroxybenzophenone; near infrared absorbers; tris (dibromopropyl) phosphate, triallyl phosphate, antimony oxide, etc.
- Antistatic agents such as anionic, cationic and nonionic surfactants
- Colorants such as inorganic pigments, organic pigments and dyes; Organic fillers and inorganic fillers; Resin modifiers; Organic fillers and inorganic fillers Plasticizer; Lubricant; Antistatic agent; Flame retardant; Retardation reducing agent and the like.
- the content of the additive in the protective film is preferably 0 to 5% by weight, more preferably 0 to 2% by weight, and still more preferably 0 to 0.5% by weight.
- (meth) acrylic-type resin, other polymers, an additive, etc. are fully mixed by arbitrary appropriate mixing methods, From the thermoplastic resin composition, it can be formed into a film.
- the (meth) acrylic resin and other polymers, additives, and the like may be made into separate solutions and mixed to form a uniform mixed solution, and then formed into a film.
- the film raw material is pre-blended with any suitable mixer such as an omni mixer, and then the obtained mixture is extruded and kneaded.
- the mixer used for extrusion kneading is not particularly limited, and for example, any suitable mixer such as an extruder such as a single screw extruder or a twin screw extruder or a pressure kneader may be used. Can do.
- the film forming method examples include any appropriate film forming methods such as a solution casting method (solution casting method), a melt extrusion method, a calendar method, and a compression molding method.
- a solution casting method solution casting method
- a melt extrusion method melt extrusion method
- a calendar method calendar method
- a compression molding method a film forming method
- the solution casting method (solution casting method) and the melt extrusion method are preferable.
- solvent used in the solution casting method examples include aromatic hydrocarbons such as benzene, toluene and xylene; aliphatic hydrocarbons such as cyclohexane and decalin; ethyl acetate and butyl acetate.
- Esters include ketones such as acetone, methyl ethyl ketone, and methyl isobutyl ketone; alcohols such as methanol, ethanol, isopropanol, butanol, isobutanol, methyl cellosolve, ethyl cellosolve, and butyl cellosolve; ethers such as tetrahydrofuran and dioxane; dichloromethane , Halogenated hydrocarbons such as chloroform and carbon tetrachloride; dimethylformamide; dimethyl sulfoxide and the like. These solvents may be used alone or in combination of two or more.
- Examples of the apparatus for performing the solution casting method include a drum casting machine, a band casting machine, and a spin coater.
- melt extrusion method examples include a T-die method and an inflation method.
- the molding temperature is preferably 150 to 350 ° C, more preferably 200 to 300 ° C.
- a T-die is attached to the tip of a known single-screw extruder or twin-screw extruder, and the film extruded into a film is wound to obtain a roll-shaped film Can do.
- simultaneous biaxial stretching, sequential biaxial stretching, and the like can be performed by stretching the film in a direction perpendicular to the extrusion direction.
- the protective film may be either an unstretched film or a stretched film.
- a stretched film either a uniaxially stretched film or a biaxially stretched film may be used.
- a biaxially stretched film either a simultaneous biaxially stretched film or a sequential biaxially stretched film may be used.
- biaxial stretching the mechanical strength is improved and the film performance is improved.
- the protective film can suppress an increase in retardation even when stretched by mixing another thermoplastic resin, and can maintain optical isotropy.
- the stretching temperature is preferably in the vicinity of the glass transition temperature of the thermoplastic resin composition as the film raw material, and specifically, preferably (glass transition temperature ⁇ 30 ° C.) to (glass transition temperature + 100 ° C.), more preferably Is in the range of (glass transition temperature ⁇ 20 ° C.) to (glass transition temperature + 80 ° C.). If the stretching temperature is less than (glass transition temperature-30 ° C.), a sufficient stretching ratio may not be obtained. On the other hand, if the stretching temperature exceeds (glass transition temperature + 100 ° C.), the resin composition may flow, and stable stretching may not be performed.
- the draw ratio defined by the area ratio is preferably 1.1 to 25 times, more preferably 1.3 to 10 times. There exists a possibility that it may not lead to the improvement of the toughness accompanying extending
- the stretching speed is unidirectional, preferably 10 to 20,000% / min, more preferably 100 to 10,000% / min. When the stretching speed is less than 10% / min, it takes time to obtain a sufficient stretching ratio, and the production cost may increase. If the stretching speed exceeds 20,000% / min, the stretched film may be broken.
- the protective film can be subjected to heat treatment (annealing) or the like after the stretching treatment in order to stabilize its optical isotropy and mechanical properties.
- Arbitrary appropriate conditions can be employ
- the thickness of the protective film is preferably 5 to 200 ⁇ m, more preferably 10 to 100 ⁇ m.
- the thickness is less than 5 ⁇ m, not only does the strength decrease, but there is a risk that crimping may increase when a durability test of the polarizing plate is performed.
- the thickness exceeds 200 ⁇ m, not only the transparency is lowered, but also the moisture permeability becomes small, and when a water-based adhesive is used, there is a possibility that the drying rate of water as the solvent becomes slow.
- the surface tension of the protective film is preferably 40 mN / m or more, more preferably 50 mN / m or more, and even more preferably 55 mN / m or more.
- the surface wetting tension is at least 40 mN / m or more, the adhesive strength between the protective film and the polarizer is further improved.
- Any suitable surface treatment can be applied to adjust the surface wetting tension. Examples of the surface treatment include corona discharge treatment, plasma treatment, ozone spraying, ultraviolet irradiation, flame treatment, and chemical treatment. Of these, corona discharge treatment and plasma treatment are preferable.
- the second protective film can be adopted as the second protective film.
- Representative examples of the material forming the second protective film include cellulose polymers such as diacetyl cellulose and triacetyl cellulose.
- the second protective film may be formed of the same material as the protective film described in the above section A-4.
- the adhesive layer provided between the polarizer 11 and the second protective film can be formed of any appropriate adhesive. As the adhesive, the adhesive composition described in the above section A-2 can be used.
- the polarizer and the protective film are laminated via an easy adhesion layer.
- the easy adhesion layer is previously formed on one side of the protective film.
- the easy-adhesion layer is typically formed by applying the easy-adhesive composition to one side of the protective film and drying it. Any appropriate method can be adopted as a method for applying the easy-adhesive composition. Examples thereof include a bar coating method, a roll coating method, a gravure coating method, a rod coating method, a slot orifice coating method, a curtain coating method, and a fountain coating method.
- the drying temperature is typically 50 ° C.
- the drying temperature is preferably 200 ° C. or lower, more preferably 180 ° C. or lower.
- surface treatment may be performed on at least one side of the protective film (the side on which the polarizer is disposed). In this case, surface treatment is performed before forming the easy-adhesion layer. Specific examples of the surface treatment are as described in the above section A-4.
- the surface treatment is preferably corona discharge treatment or plasma treatment. By performing the corona discharge treatment, the adhesion and adhesion between the polarizer and the protective film can be further improved.
- the corona discharge treatment is performed under any appropriate conditions.
- the corona discharge electron dose is preferably 50 to 150 W / m 2 / min, more preferably 70 to 100 W / m 2 / min.
- the polarizer and the protective film are laminated via an adhesive layer.
- the method of bonding a polarizer and a protective film and drying is mentioned.
- the method for applying the adhesive composition include a roll method, a spray method, and an immersion method.
- an adhesive composition contains a metal compound colloid, it applies so that the thickness after drying may become larger than the average particle diameter of a metal compound colloid.
- the drying temperature is typically 5 to 150 ° C., preferably 30 to 120 ° C.
- the drying time is typically 120 seconds or longer, preferably 300 seconds or longer.
- the image display device of the present invention includes the polarizing plate of the present invention.
- Specific examples of the image display device include a self-luminous display device such as an electroluminescence (EL) display, a plasma display (PD), and a field emission display (FED), and a liquid crystal display device.
- the liquid crystal display device includes a liquid crystal cell and the polarizing plate disposed on at least one side of the liquid crystal cell.
- Example 1 (Production of polarizer) A polyvinyl alcohol film having a thickness of 75 ⁇ m was immersed in warm water at 28 ° C. for 60 seconds to swell. Next, it was immersed in an aqueous solution containing iodine and potassium iodide (weight ratio 1:10) and dyed so as to have a predetermined single body transmittance while stretching up to 3.3 times. Thereafter, the film was immersed in an aqueous solution containing 3% by weight boric acid and 2% by weight potassium iodide for 10 seconds and stretched in an aqueous solution containing 4% by weight boric acid and 3% by weight potassium iodide at 60 ° C. Was stretched to a total of 6.0 times.
- iodine and potassium iodide weight ratio 1:10
- the obtained stretched film was immersed in an aqueous solution containing 5% by weight of potassium iodide for 10 seconds and dried in an oven at 40 ° C. for 3 minutes to obtain a polarizer having a thickness of 30 ⁇ m.
- a mixture of 90 parts by weight and 10 parts by weight of acrylonitrile-styrene (AS) resin ⁇ Toyo AS AS20, manufactured by Toyo Styrene Co., Ltd .; Tg 127 ° C.] was supplied to a twin screw extruder and sheet-shaped at about 280 ° C. And a (meth) acrylic resin sheet having a lactone ring structure with a thickness of 110 ⁇ m was obtained. The unstretched sheet was stretched 2.0 times in length and 2.4 times in width under a temperature condition of 160 ° C. to obtain a protective film (thickness 40 ⁇ m, in-plane retardation ⁇ nd 0.8 nm, thickness direction retardation Rth 1.5 nm). )
- corona discharge treatment One side of the protective film obtained above was subjected to corona discharge treatment (corona discharge electron irradiation amount: 77 W / m 2 / min).
- acetoacetyl group-containing polyvinyl alcohol resin (average polymerization degree: 1200, saponification degree: 98.5 mol%, acetoacetyl group modification degree: 5 mol%) is 100 parts by weight, and 20 parts by weight of methylolmelamine is 30 ° C. It was dissolved in pure water under temperature conditions to obtain an aqueous solution with a solid content concentration of 0.5%. The obtained aqueous solution was used as an adhesive composition under a temperature condition of 30 ° C.
- the adhesive composition was applied to the easy-adhesion layer side of the protective film on which the easy-adhesion layer was formed so that the thickness after drying was 50 nm. Similarly, the adhesive composition was applied to one side of the second protective film. After that, a protective film and a second protective film are laminated on both sides of the polarizer via the adhesive composition, put into a hot air dryer (70 ° C.) and dried for 5 minutes to obtain a polarizing plate. It was.
- Example 2 A polarizing plate was produced in the same manner as in Example 1 except that the drying temperature was 120 ° C. when forming the easy-adhesion layer.
- Example 3 A polarizing plate was produced in the same manner as in Example 1 except that the drying temperature was set to 100 ° C. during the formation of the easy adhesion layer.
- Example 4 A polarizing plate was produced in the same manner as in Example 1 except that the drying temperature was set to 80 ° C. during the formation of the easy adhesion layer.
- Example 5 A polarizing plate was produced in the same manner as in Example 1 except that the drying temperature was set to 60 ° C. during the formation of the easy adhesion layer.
- Example 9 A polarizing plate was produced in the same manner as in Example 1 except that no crosslinking agent was added during the preparation of the easy-adhesive composition for forming the easy-adhesion layer.
- the adhesion between the protective film and the easy adhesion layer in each example and each comparative example was evaluated.
- the evaluation method is as follows, and the evaluation results are shown in Table 1. (Evaluation method of adhesion between protective film and easy adhesion layer)
- the easy-adhesive composition used in each example and each comparative example was applied with a bar coater so that the thickness after drying was 300 nm, and dried in an oven.
- An easy adhesion layer was formed on the surface of the protective film. In this way, a test sample was obtained.
- a foundation eye test was performed in accordance with JIS K5400 3.5.
- a 1 mm square base-shaped cut was made with a sharp blade on the easy-adhesion layer surface of the test sample, and then cellophane tape (24 mm width, JIS Z1522) was adhered with a wooden spatula. Thereafter, the cellophane tape was peeled off, and the number of squares not attached to the adhesive tape was counted in 100 squares of cut. That is, the case where the easy-adhesion layer does not peel is indicated as 100/100, and the case where all the easy-adhesion layers peel is indicated as 0/100.
- the polarizing plate obtained in Examples 1 to 5 and Comparative Examples 7 to 9 was evaluated as follows. The evaluation results are shown in Table 2. 1. Adhesiveness between Polarizer and Protective Film A sample piece having a size of 5 cm ⁇ 5 cm was cut out from the polarizing plate obtained above, and the surface of the protective film was subjected to pressure-sensitive adhesive treatment and attached to a glass plate. Thereafter, one corner of the polarizing plate was picked, the polarizing plate was peeled off from the glass plate at a speed of 1 mm / sec in the diagonal direction, and the peeling position was observed. In addition, it peeled so that the corner
- the evaluation criteria are as follows.
- Moisture resistance 2 (color resistance) From the polarizing plate obtained above, a rectangular sample piece having a size of 25 mm ⁇ 50 mm was cut out, placed in a constant temperature and humidity machine at a temperature of 60 ° C. and a humidity of 90% RH, and left for 500 hours. Thereafter, the state of discoloration was visually observed. The judgment criteria are as follows. A: No discoloration was confirmed. ⁇ : A slight discoloration was confirmed. X: Discoloration was confirmed as a whole. Heat resistance (adhesion and color resistance) From the polarizing plate obtained above, a rectangular sample piece having a size of 25 mm ⁇ 50 mm was cut out, placed in a thermostat at 60 ° C., and left for 500 hours.
- Examples 1 to 5 and Comparative Example 9 were generally excellent in water resistance, but Comparative Examples 7 and 8 were inferior.
- Examples 1 to 5 were excellent in moisture resistance, but Comparative Examples 7 to 9 were inferior in moisture resistance. From this, it can be said that a polarizing plate excellent in water resistance and moisture resistance can be obtained by forming the easy adhesion layer with an easy adhesive composition containing a urethane resin having a carboxyl group and a crosslinking agent.
- Examples 1 to 5 and Comparative Example 9 were excellent in heat resistance, but Comparative Examples 7 and 8 were inferior in heat resistance. From this, it can be said that a polarizing plate excellent in heat resistance can be obtained by using a urethane resin having a carboxyl group.
- Examples 1 and 2 were extremely excellent in moisture resistance (color resistance), and in Example 3, slight discoloration was confirmed. On the other hand, in Examples 4 and 5, discoloration was confirmed. From this, it can be said that a polarizing plate having excellent color resistance can be obtained by setting the drying temperature at the time of forming the easy adhesion layer to 90 ° C. or higher. In Example 3 (drying temperature 100 ° C.), Example 4 (drying temperature 80 ° C.), and Example 5 (drying temperature 60 ° C.), discoloration was confirmed. When the time was 2 hours, a polarizing plate having excellent color resistance was obtained even when the drying temperature in forming the easy-adhesion layer was 100 ° C. or 80 ° C. From this, it can be said that a polarizing plate excellent in adhesion and color resistance can be obtained in a short time by setting the drying temperature at the time of forming the easy adhesion layer to 110 ° C. or higher.
- the polarizing plate of the present invention can be suitably used for image display devices such as liquid crystal display devices and self-luminous display devices.
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Abstract
Description
A.偏光板の全体構成
図1は、本発明の好ましい実施形態による偏光板の概略断面図である。偏光板10は、偏光子11と、接着剤層12と、易接着層13と、保護フィルム14とをこの順に有する。図示しないが、実用的には、偏光板10は、偏光子11の保護フィルム14と反対側に、接着剤層を介して貼り付けられた第2の保護フィルムを有する。
上記偏光子11としては、目的に応じて任意の適切な偏光子が採用され得る。例えば、ポリビニルアルコール系フィルム、部分ホルマール化ポリビニルアルコール系フィルム、エチレン・酢酸ビニル共重合体系部分ケン化フィルム等の親水性高分子フィルムに、ヨウ素や二色性染料等の二色性物質を吸着させて一軸延伸したもの、ポリビニルアルコールの脱水処理物やポリ塩化ビニルの脱塩酸処理物等ポリエン系配向フィルム等が挙げられる。これらのなかでも、ポリビニルアルコール系フィルムにヨウ素などの二色性物質を吸着させて一軸延伸した偏光子が、偏光二色比が高く特に好ましい。これら偏光子の厚さは特に制限されないが、一般的に、1~80μm程度である。
上記接着剤層12を形成する接着剤としては、任意の適切な接着剤を採用し得る。好ましくは、接着剤層12は、ポリビニルアルコール系樹脂を含む接着剤組成物から形成される。
上記易接着層13は、カルボキシル基を有するウレタン樹脂と架橋剤とを含む易接着剤組成物で形成される。易接着層をこのような易接着剤組成物で形成することにより、偏光子と保護フィルムとの密着性(特に、高温・高湿下における)に優れた偏光板を提供し得る。また、ウレタン樹脂を用いることにより、保護フィルムとの密着性に優れた易接着層が得られ得る。易接着剤組成物は、好ましくは、水系である。水系は、溶剤系に比べて環境面に優れ、作業性にも優れ得る。
上記保護フィルム14は、(メタ)アクリル系樹脂を含む。保護フィルムは、例えば、(メタ)アクリル系樹脂を主成分として含む樹脂成分を含有する成型材料を、押出し成型にて成型して得られる。
上記第2の保護フィルムとしては、任意の適切な保護フィルムを採用し得る。第2の保護フィルムを形成する材料の代表例としては、ジアセチルセルロース、トリアセチルセルロース等のセルロース系ポリマーが挙げられる。第2の保護フィルムは、上記A-4項に記載の保護フィルムと同様の材料で形成されていてもよい。上記偏光子11と第2の保護フィルムとの間に設けられる接着剤層は、任意の適切な接着剤で形成され得る。当該接着剤として、上記A-2項に記載の接着剤組成物を用い得る。
本発明の偏光板の製造方法としては、任意の適切な方法を採用し得る。以下、一つの実施形態について説明する。上記偏光子と上記保護フィルムは、易接着層を介して積層される。例えば、易接着層は、予め、保護フィルムの片側に形成される。易接着層は、代表的には、上記易接着剤組成物を保護フィルムの片側に塗布して、乾燥させることにより形成される。易接着剤組成物の塗布方法としては、任意の適切な方法を採用し得る。例えば、バーコート法、ロールコート法、グラビアコート法、ロッドコート法、スロットオリフィスコート法、カーテンコート法、ファウンテンコート法等が挙げられる。乾燥温度としては、代表的には50℃以上、好ましくは90℃以上、さらに好ましくは110℃以上である。乾燥温度をこのような範囲とすることにより、耐色性(特に、高温高湿下における)に優れた偏光板を提供し得る。乾燥温度は、好ましくは200℃以下、さらに好ましくは180℃以下である。
本発明の画像表示装置は、本発明の偏光板を備える。画像表示装置の具体例としては、エレクトロルミネッセンス(EL)ディスプレイ、プラズマディスプレイ(PD)、電界放出ディスプレイ(FED:Field Emission Display)のような自発光型表示装置、液晶表示装置が挙げられる。液晶表示装置は、液晶セルと、当該液晶セルの少なくとも片側に配置された上記偏光板とを備える。
<光学特性>
面内位相差Δndおよび厚み方向位相差Rthは、王子計測器社製KOBRA-WPRを用いて測定した。可視光透過率(全光線透過率)は、日本電色工業社製NDH-1001DPを用いて測定した。
(偏光子の作製)
厚さ75μmのポリビニルアルコールフィルムを、28℃温水中に60秒間浸漬して膨潤させた。次に、ヨウ素およびヨウ化カリウム(重量比1:10)を含む水溶液に浸漬して、3.3倍まで延伸しながら、所定の単体透過率となるように染色した。その後、3重量%のホウ酸および2重量%のヨウ化カリウムを含む水溶液中に10秒間浸漬し、60℃の4重量%のホウ酸および3重量%のヨウ化カリウムを含む水溶液中で延伸倍率が計6.0倍となるように延伸した。その後、得られた延伸フィルムを、5重量%のヨウ化カリウムを含む水溶液に10秒間浸漬し、40℃のオーブンで3分間乾燥して、厚さ30μmの偏光子を得た。
[下記一般式(1)中、R1は水素原子、R2およびR3はメチル基であるラクトン環構造を有する(メタ)アクリル系樹脂{共重合モノマー重量比=メタクリル酸メチル/2-(ヒドロキシメチル)アクリル酸メチル=8/2、ラクトン環化率約100%、ラクトン環構造の含有割合19.4%、重量平均分子量133000、メルトフローレート6.5g/10分(240℃、10kgf)、Tg131℃}90重量部と、アクリロニトリル-スチレン(AS)樹脂{トーヨーAS AS20、東洋スチレン社製}10重量部との混合物;Tg127℃]のペレットを二軸押し出し機に供給し、約280℃でシート状に溶融押し出しして、厚さ110μmのラクトン環構造を有する(メタ)アクリル系樹脂シートを得た。この未延伸シートを、160℃の温度条件下、縦2.0倍、横2.4倍に延伸して保護フィルム(厚さ40μm、面内位相差Δnd0.8nm、厚み方向位相差Rth1.5nm)を得た。
上記で得られた保護フィルムの片側に、コロナ放電処理(コロナ放電電子照射量:77W/m2/min)を施した。
カルボキシル基を有する水系ウレタン樹脂(第一工業製薬製、商品名:スーパーフレックス210、固形分:33%)100gに対して、架橋剤(日本触媒製、商品名:エポクロスWS700、固形分:25%)20gを添加し、3分間攪拌し、易接着剤組成物を得た。
得られた易接着剤組成物を、コロナ放電処理を施した保護フィルムのコロナ放電処理面に、バーコーター(#6)で塗布した。その後、保護フィルムを熱風乾燥機(140℃)に投入し、ウレタン組成物を約5分乾燥させて、易接着層(0.2~0.4μm)を形成した。
厚さ40μmのトリアセチルセルセルロースフィルムを、10%の水酸化ナトリウム水溶液(60℃)に30秒間浸漬してケン化した後、60秒間水洗し、第2の保護フィルムを得た。
アセトアセチル基含有ポリビニルアルコール系樹脂(平均重合度:1200、ケン化度:98.5モル%,アセトアセチル基変性度:5モル%)100重量部に対し、メチロールメラミン20重量部を30℃の温度条件下で純水に溶解し、固形分濃度0.5%の水溶液を得た。得られた水溶液を接着剤組成物として、30℃の温度条件下で用いた。
上記接着剤組成物を調製から30分後に、易接着層を形成した保護フィルムの易接着層側に、乾燥後の厚みが50nmとなるように接着剤組成物を塗布した。同様に、上記第2の保護フィルムの片側に、接着剤組成物を塗布した。その後、接着剤組成物を介して、偏光子の両側それぞれに、保護フィルムおよび第2の保護フィルムを積層し、熱風乾燥機(70℃)に投入して5分間乾燥させて、偏光板を得た。
易接着層の形成の際に、乾燥温度を120℃にしたこと以外は実施例1と同様にして偏光板を作製した。
易接着層の形成の際に、乾燥温度を100℃にしたこと以外は実施例1と同様にして偏光板を作製した。
易接着層の形成の際に、乾燥温度を80℃にしたこと以外は実施例1と同様にして偏光板を作製した。
易接着層の形成の際に、乾燥温度を60℃にしたこと以外は実施例1と同様にして偏光板を作製した。
易接着層を形成する易接着剤組成物の調製の際、カルボキシル基を有する水系ウレタン樹脂のかわりに反応性基を有さない水系プロピレン樹脂(UMG ABS社製、商品名:TP608B、固形分:37.2%)を用いたこと以外は実施例1と同様にして偏光板を作製した。
易接着層を形成する易接着剤組成物の調製の際、カルボキシル基を有する水系ウレタン樹脂のかわりに反応性基を有さない水系プロピレン樹脂(UMG ABS社製、商品名:TP003P、固形分:40.3%)を用いたこと以外は実施例1と同様にして偏光板を作製した。
易接着層を形成する易接着剤組成物の調製の際、カルボキシル基を有する水系ウレタン樹脂のかわりに反応性基を有さない水系プロピレン樹脂(UMG ABS社製、商品名:TP601B、固形分:37.3%)を用いたこと以外は実施例1と同様にして偏光板を作製した。
易接着層を形成する易接着剤組成物の調製の際、カルボキシル基を有する水系ウレタン樹脂のかわりに反応性基を有さない水系の変性プロピレン樹脂(UMG ABS社製、商品名:TP006M、固形分:29.7%)を用いたこと以外は実施例1と同様にして偏光板を作製した。
易接着層を形成する易接着剤組成物の調製の際、カルボキシル基を有する水系ウレタン樹脂のかわりに反応性基を有さない水系エチレン樹脂(UMG ABS社製、商品名:TE502P、固形分:38.1%)を用いたこと以外は実施例1と同様にして偏光板を作製した。
易接着層を形成する易接着剤組成物の調製の際、カルボキシル基を有する水系ウレタン樹脂のかわりに反応性基を有さない水系スチレン樹脂(UMG ABS社製、商品名:TS101E、固形分:40.9%)を用いたこと以外は実施例1と同様にして偏光板を作製した。
易接着層を形成する易接着剤組成物の調製の際、カルボキシル基を有する水系ウレタン樹脂のかわりにシロキサン基を有する水系ウレタン樹脂(三井化学ポリウレタン社製、商品名:WS4000、固形分:29.5%)を用いたこと以外は実施例1と同様にして偏光板を作製した。
易接着層を形成する易接着剤組成物の調製の際、カルボキシル基を有する水系ウレタン樹脂のかわりに反応性基を有さない水系ウレタン樹脂(三井化学ポリウレタン社製、商品名:W6010、固形分:30%)を用いたこと以外は実施例1と同様にして偏光板を作製した。
易接着層を形成する易接着剤組成物の調製の際、架橋剤を加えなかったこと以外は実施例1と同様にして偏光板を作製した。
(保護フィルムと易接着層との密着性の評価方法)
上記で得られた保護フィルムの表面に、各実施例および各比較例で用いた易接着剤組成物を、乾燥後の厚みが300nmとなるようにバーコーターで塗布して、オーブンで乾燥させ、保護フィルム表面に易接着層を形成した。このようにして、試験サンプルを得た。
得られた試験サンプルの保護フィルムと易接着層との密着性について、JIS K5400 3.5に準拠して基盤目試験を行った。具体的には、試験サンプルの易接着層面に、鋭利な刃物で1mm角の基盤目状の切り込みを入れた後、セロハンテープ(24mm幅、JIS Z1522)を木へらで密着させた。その後、セロハンテープを剥がし、切り込み100マス中、粘着テープに付着しないマス目の数を数えた。すなわち、易接着層が剥離しない場合を100/100と示し、全て剥離する場合を0/100と示す。
1.偏光子と保護フィルムとの接着性
上記で得られた偏光板から5cm×5cmの寸法のサンプル片を切り出し、保護フィルムの表面に粘着加工を施し、ガラス板に貼り付けた。その後、偏光板の1つの角部を摘み、対角線方向に1mm/secの速度で偏光板をガラス板から剥離し、剥離位置を観察した。なお、偏光板の角部がガラス板に対して90°となるように剥離した。評価基準は以下のとおりである。
○:粘着剤とガラス板との界面で剥離した
×:偏光子と保護フィルムとの界面で剥離した
2.耐水性(密着性)
上記で得られた偏光板から、25mm×50mmの寸法の矩形状のサンプル片を切り出し、60℃の温水に5時間浸漬した。その後、偏光子と保護フィルムとの界面における剥離の有無を観察した。判定基準は以下のとおりである。
◎:剥離は確認されなかった
○:一部に剥離が確認された
×:全体に剥離が確認された
3.耐湿性1(密着性)
上記で得られた偏光板から、25mm×50mmの寸法の矩形状のサンプル片を切り出し、温度60℃、湿度90%RHの恒温恒湿機に入れ、500時間放置した。その後、偏光子と保護フィルムとの界面における剥離の有無を目視にて観察した。判定基準は以下のとおりである。
◎:剥離は確認されなかった
○:一部に剥離が確認された
×:全体に剥離が確認された
4.耐湿性2(耐色性)
上記で得られた偏光板から、25mm×50mmの寸法の矩形状のサンプル片を切り出し、温度60℃、湿度90%RHの恒温恒湿機に入れ、500時間放置した。その後、変色の様子を目視にて観察した。判定基準は以下のとおりである。
◎:変色は確認されなかった
○:わずかに変色が確認された
×:全体的に変色が確認された
5.耐熱性(密着性および耐色性)
上記で得られた偏光板から、25mm×50mmの寸法の矩形状のサンプル片を切り出し、60℃の恒温機に入れ、500時間放置した。その後、変色や偏光子と保護フィルムとの界面における剥離の様子を目視にて観察した。判定基準は以下のとおりである。
◎:剥離および変色は確認されなかった
○:わずかに剥離が確認され、わずかに変色が確認された
×:全体的に剥離および変色が確認された
実施例1および実施例2は耐湿性(耐色性)にも極めて優れており、実施例3ではわずかに変色が確認された。一方、実施例4および5は、変色が確認された。このことから、易接着層形成時の乾燥温度を90℃以上とすることにより、耐色性にも優れた偏光板が得られるといえる。なお、実施例3(乾燥温度100℃)、実施例4(乾燥温度80℃)および実施例5(乾燥温度60℃)において、変色が確認されたが、易接着層形成の際の乾燥時間を2時間とすると、易接着層形成の際の乾燥温度が100℃、80℃であっても、耐色性に優れた偏光板が得られた。このことから、易接着層形成時の乾燥温度を110℃以上とすることにより、短時間で密着性・耐色性に優れた偏光板が得られるといえる。
11 偏光子
12 接着剤層
13 易接着層
14 保護フィルム
Claims (7)
- 偏光子と、接着剤層と、カルボキシル基を有するウレタン樹脂と架橋剤とを含む易接着剤組成物で形成された易接着層と、(メタ)アクリル系樹脂を含む保護フィルムとを有する、偏光板。
- 前記接着剤層がアセトアセチル基含有ポリビニルアルコール樹脂を含む接着剤組成物で形成された、請求項1に記載の偏光板。
- 前記易接着層が前記易接着剤組成物を90℃以上で乾燥させて得られた、請求項1または2に記載の偏光板。
- 前記保護フィルムの偏光子が配置されている側にコロナ放電処理またはプラズマ処理が施されている、請求項1から3のいずれかに記載の偏光板。
- 前記架橋剤がオキサゾリン基を有するアクリル系ポリマーである、請求項1から4のいずれかに記載の偏光板。
- 請求項1から5のいずれかに記載の偏光板を備える、画像表示装置。
- 液晶セルと、該液晶セルの少なくとも片側に配置された請求項1から5のいずれかに記載の偏光板とを備える、液晶表示装置。
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CN101918870A (zh) | 2010-12-15 |
US8400586B2 (en) | 2013-03-19 |
US20100283946A1 (en) | 2010-11-11 |
JP5399082B2 (ja) | 2014-01-29 |
TW200951514A (en) | 2009-12-16 |
TWI436110B (zh) | 2014-05-01 |
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JP2009193061A (ja) | 2009-08-27 |
KR20100113085A (ko) | 2010-10-20 |
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