WO2010044232A1 - 偏光板 - Google Patents
偏光板 Download PDFInfo
- Publication number
- WO2010044232A1 WO2010044232A1 PCT/JP2009/005269 JP2009005269W WO2010044232A1 WO 2010044232 A1 WO2010044232 A1 WO 2010044232A1 JP 2009005269 W JP2009005269 W JP 2009005269W WO 2010044232 A1 WO2010044232 A1 WO 2010044232A1
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- WO
- WIPO (PCT)
- Prior art keywords
- adhesive
- diallylamine
- polarizing plate
- film
- polarizing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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Classifications
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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
- C09J145/00—Adhesives based on homopolymers or copolymers of compounds having no unsaturated aliphatic radicals in a side chain, and having one or more carbon-to-carbon double bonds in a carbocyclic or in a heterocyclic system; Adhesives based on derivatives of such polymers
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
-
- 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
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
-
- 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
- C09J133/00—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 only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
- C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09J133/08—Homopolymers or copolymers of acrylic acid esters
-
- 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
- C09J139/00—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 a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen; Adhesives based on derivatives of such polymers
-
- 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
- C09J139/00—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 a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen; Adhesives based on derivatives of such polymers
- C09J139/02—Homopolymers or copolymers of vinylamine
-
- 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
- C09J163/00—Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins
-
- 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
-
- 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]
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
-
- 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
- C09J2433/00—Presence of (meth)acrylic polymer
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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
- G02F2202/00—Materials and properties
- G02F2202/28—Adhesive materials or arrangements
Definitions
- the present invention relates to a polarizing plate using an adhesive containing a diallylamine polymer.
- a polarizing element is produced by uniaxially stretching iodine or dichroic dye, which is a dichroic dye, on a polyvinyl alcohol resin film after adsorption orientation. Since this polarizing element is inferior in mechanical strength as it is, usually a film made of saponified triacetyl cellulose (hereinafter referred to as TAC in this specification) or the like is bonded as a protective film, and a polarizing plate As an image display device such as a liquid crystal display device.
- a polyvinyl alcohol (PVA) adhesive is usually used for adhesion between the polarizing element and the protective film.
- polarizing plates In recent years, demands for various properties of polarizing plates are high, for example, improvement of polarization properties, reduction of birefringence, improvement of total light transmittance, control of moisture permeability, improvement of mechanical strength (pencil hardness, friction resistance), etc. Further improvements such as improved durability are demanded.
- improvements to polarizing elements and protective films have been promoted.
- olefin resin films cycloolefin resin films such as norbornene films and polyolefin resin films such as polypropylene
- acrylic resin films which have higher mechanical strength and durability than TAC that has been used normally.
- the use of a vinyl ester resin film or the like as a protective film has been studied.
- Patent Documents 1 and 2 disclose a method of adhering with a photocurable adhesive when a norbornene-based film is used as a protective film, for example.
- the polarizing element or the surface treatment layer such as the hard coat layer may be deteriorated. Development of an adhesive having excellent durability and adhesiveness is also required for the protective film.
- a protective film other than the cellulose-based resin such as TAC for example, an acrylic resin film, or a polyolefin-based resin film such as a cycloolefin-based resin and a polypropylene resin, is used as the protective film.
- the object is to develop an adhesive having good adhesion to the polarizing element and to develop a polarizing plate having excellent high-humidity heat resistance bonded with the adhesive.
- the present inventors have used an adhesive containing a diallylamine-based polymer as an adhesive component for adhesion between a protective film and a polarizing element.
- a protective film made of not only a protective film, but also an acrylic resin, a cycloolefin resin, or other olefin resin
- the protective film and the polarizing element can be strongly bonded.
- the inventors have newly found that various performances can be greatly improved, and have completed the present invention.
- the present invention (1) A polarizing plate characterized in that a protective film and a polarizing element are bonded with an adhesive containing a diallylamine-based polymer, (2) The protective film according to (1) above, wherein the protective film is any one of a film made of an acrylic resin, a film made of an olefin resin, a film made of a cellulose resin, and a PET film.
- Polarizer (3) The polarizing plate according to any one of (1) to (2) above, wherein the diallylamine polymer is a homopolymer of a diallylamine compound or a copolymer of a diallylamine compound, (4) The polarizing plate according to any one of (1) to (3) above, wherein the diallylamine polymer is an epihalohydrin-modified diallylamine polymer.
- An image display device comprising the polarizing plate according to any one of (1) to (7) above, (9) A water-based adhesive for polarizing plates containing a diallylamine-based polymer at a concentration of 5 to 25% by weight with respect to the total amount of the adhesive, (10) The aqueous adhesive for polarizing films according to (9), wherein the diallylamine polymer is an epihalohydrin-modified diallylamine polymer, (11) The aqueous adhesive for polarizing films according to (9) or (10), further comprising an amine-based silane coupling agent, (12) A method for producing a polarizing plate, wherein the protective film and the polarizing element are pressure-bonded in the presence of a water-based adhesive containing a diallylamine-based polymer over the entire adhesive surface of both, and then dried.
- a resin film adhesive containing a diallylamine polymer and an amine silane coupling agent (14) The polarizing plate according to any one of (1) to (6) above, wherein the protective film has a water vapor transmission rate (JIS K7129B) of 100 to 0.1 g / m 2 ⁇ 24 hr or less. About.
- the polarizing plate of the present invention not only cellulose-based resins such as TAC, but also protective films made of acrylic resins, olefin resins (cycloolefin resins or polyolefin resins), vinyl ester resins, etc.
- the protective film and the polarizing element can be strongly bonded, and the durability of the polarizing plate, particularly the durability under wet heat conditions, can be remarkably improved.
- protective films with higher hardness and excellent heat resistance and friction resistance, or protective films with excellent optical properties than cellulose-based resins such as TAC can be used, mechanical properties and optical properties are improved. Can be made.
- the polarizing plate of the present invention can be obtained by bonding the protective film and the polarizing element using an aqueous adhesive containing a diallylamine polymer as an adhesive component.
- the adhesive used for the polarizing plate of the present invention is a composition containing a diallylamine-based polymer, and is usually an aqueous composition.
- the diallylamine polymer (diallylamine compound polymer) in the present invention may be either a homopolymer of diallylamine compound (diallylamine compound), a copolymer of diallylamine compound, or a modified product thereof.
- the modified form of the polymer (homopolymer or copolymer) of the diallylamine compound is preferably, for example, a halogenoepoxy-modified diallylamine-based polymer, more preferably an epihalohydrin-modified product, particularly an epichlorohydrin-modified product (hereinafter referred to as epihalohydrin or epichlorohydrin-modified product). Also referred to as diallylamine polymer).
- Examples of the homopolymer of diallylamine compounds include the homopolymers of diallylamine compounds described below.
- a copolymer of a diallylamine compound a copolymer containing a diallylamine compound as a main component is preferable.
- One of the preferred copolymers is a copolymer obtained by copolymerizing at least two kinds of the diallylamine compounds.
- the copolymer containing a polymerizable component other than the diallylamine compound include at least one of the diallylamine compounds, (meth) acrylic acid (acrylic acid or methacrylic acid) or a salt thereof, and (meth) acrylamide.
- Examples thereof include a copolymer with a compound having a (meth) acryl group such as (acrylamide or methacrylamide) or a salt thereof.
- the content (molar ratio) of these other polymerizable components in the copolymer containing these other polymerizable components is 0 to 40 mol%, more preferably 0 to 20 mol%, based on the entire copolymer. More preferably, it is 0 to 10 mol%, and the balance is a diallylamine compound component.
- halogenoepoxy-modified diallylamine-based polymer examples include a modified product obtained by reacting a homopolymer or copolymer of a diallylamine-based compound with a halogenoglycidyl compound such as epihalohydrin, more preferably epichlorohydrin. It is a modified body.
- the amine compound may be any of secondary amines, tertiary amines or salts thereof, or quaternary ammonium salts.
- the secondary amine having two (meth) allyl groups on the nitrogen atom (when n in the above formula (a) is 0) or salts thereof include diallylamine or dimethallylamine and inorganic or organic acid salts thereof. .
- the inorganic or organic acid salt include hydrochloride, sulfate, phosphate, acetate, and oxalate of the above amine.
- Tertiary amines having two (meth) allyl groups on the nitrogen atom (when n in the above formula (a) is 1) or salts thereof include diallyl such as diallylmethylamine, diallylethylamine and diallylbutylamine ( C1-C4 alkyl) amine, or diallyl (C1-C4 alkylene) diamine, or an inorganic or organic acid salt thereof, and diallyl (C1-C4 alkyl) amine or a salt thereof is preferred. More specifically, the hydrochloride, sulfate, phosphate, acetate or oxalate of diallylmethylamine, diallylethylamine or diallylbutylamine can be used.
- diallylmethyl or ethylamine salt More preferred is a diallylmethyl or ethylamine salt.
- hydrochloride is preferable.
- diallyldi such as diallyldimethylammonium salt and diallyldiethylammonium salt
- C1-C4 alkyl diallyldi (such as diallyldimethylammonium salt and diallyldiethylammonium salt) C1-C4 alkyl) ammonium ions and inorganic or organic ions, such as diallyldimethylammonium chloride, diallyldimethylammonium bromide, diallyldiethylammonium chloride, diallyldibutylammonium chloride, and diallylmethylethylammonium chloride.
- diallyldi such as diallyldimethylammonium salt and diallyldiethylammonium salt
- diallyldibutylammonium chloride diallylmethyl
- the homopolymer of the diallylamine compound used in the present invention may be obtained by polymerizing the diallylamine compound alone. Further, the copolymer can be obtained by combining at least two kinds of the above diallylamine compounds or polymerizing at least one kind of the above diallylamine compounds with another polymerizable monomer. Furthermore, these modified products can be obtained by reacting these homopolymers or copolymers with epoxy-containing compounds such as epihalohydrins, more preferably glycidyl group-containing halogeno compounds (halogenoglycidyl compounds) such as epichlorohydrin. Can do.
- epoxy-containing compounds such as epihalohydrins
- halogenoglycidyl compounds halogenoglycidyl compounds
- Preferred diallylamine-based polymers include diallyl mono- or di (C1-C4 alkyl) amine polymers and epihalohydrin-modified products thereof.
- the polymer may be either a polymer composed of one kind of diallyl mono or di (C1-C4 alkyl) amine or a copolymer composed of two or more kinds. More preferred are a polymer of diallyl C1-C4 alkylamine and an epihalohydrin modified product thereof.
- the diallylamine-based polymer in the present invention is a water-soluble polymer, and the number average molecular weight of the polymer is about 100 to 1,000,000, preferably about 1,000 to 500,000, more preferably 10, It is about 000 to 100,000, more preferably about 30,000 to 100,000.
- the diallylamine-based polymer is 1.0 to 40% by weight, preferably 2 to 30% by weight, more preferably, based on the balance of adhesive strength and adhesive quality retention time. 5 to 25% by weight, more preferably 8 to 20% by weight.
- the remainder is an optional additive and an aqueous solvent (for example, water alone or a mixed solvent of water and a water-soluble solvent having a lower boiling point than water such as methanol or ethanol, preferably water alone).
- an adhesive component other than the diallylamine-based polymer may be included as an optional additive, the diallylamine-based polymer alone is usually preferable as the adhesive component.
- Preferred optional additives include coupling agents, preferably amine silane coupling agents.
- the addition amount of the coupling agent is 0 to 20% by weight, preferably 0 to 10% by weight, more preferably 0 to 6% by weight, based on the diallylamine-based polymer in the adhesive.
- the amount is preferably 0.5% by weight or more, more preferably 1% by weight or more, and more preferably 1% by weight or more based on the diallylamine-based polymer in the adhesive.
- a more preferable adhesive is 1.0 to 40% by weight, preferably 2 to 30% by weight, more preferably 5 to 25% by weight, and still more preferably 8% by weight of diallylamine polymer based on the total amount of the adhesive.
- the coupling agent preferably an amine silane coupling agent, is contained in an amount of 0.5 to 20% by weight, preferably 1 to 10% by weight, more preferably 1 to 6%, based on the diallylamine polymer. Contains% by weight, the balance being water.
- % is described in the present specification, it represents “% by weight” unless otherwise specified.
- the adhesive of the present invention is suitable for bonding a polarizing plate and a protective film, but is also preferable as an adhesive for laminating other resin films.
- an aqueous adhesive containing a diallylamine-based polymer and a silane coupling agent, preferably an amine-based silane coupling agent is preferable as an adhesive for laminating a resin film, and an adhesive containing an epihalohydrin-modified diallylamine-based polymer as an adhesive component.
- an adhesive for resin films is more suitable as an adhesive for resin films.
- the resin film to be bonded is not particularly limited as long as it is a synthetic resin film, but the same kind of films or different kinds of films selected from polyolefin films, polyester films, acrylic resin films, vinyl resin films, silicon resin films, etc. Any of these may be used.
- the adhesive of the present invention is preferably used by activating it with a basic aqueous solution at the time of use since the diallylamine polymer as an adhesive component is a salt with an acid, usually a salt with hydrochloric acid or the like.
- preferable basic aqueous solutions include aqueous solutions of basic compounds such as alkali metal hydroxides such as sodium hydroxide, potassium hydroxide, calcium hydroxide, barium hydroxide, and cesium hydroxide.
- an aqueous solution of sodium hydroxide or potassium hydroxide is preferred.
- the addition amount of the basic compound is preferably an amount capable of neutralizing the acid added to the diallylamine polymer and making the diallylamine polymer free.
- an aqueous solution of 1.0 to 30%, preferably 3 to 10%, of the basic compound is added to the total amount of diallylamine-based polymer in the adhesive.
- the adhesive of the present invention contains an optional silane coupling agent, preferably an amine-based silane coupling agent, it is more preferable in terms of improving the adhesive strength.
- the addition amount of the silane coupling agent is usually about 0 to 20%, preferably about 0.1 to 10%, more preferably about 0.5 to 6% with respect to the diallylamine-based polymer of the present invention. In some cases, the more preferred range may be 0.5-3%, or 1-3%.
- amine-based silane coupling agent examples include, for example, N- ⁇ - (N-vinylbenzylaminoethyl) - ⁇ -aminopropyltrimethoxysilane hydrochloride (trade name: SZ-6032, manufactured by Toray Dow Corning Co., Ltd.).
- Aminopropyltri (C1-C3alkoxy) silane compounds or aminopropyldi (C1-C3) Alkoxy) include C1 ⁇ C3 alkyl silane compound.
- the amino group of the silane compound has 1 to 2 substituents selected from the group consisting of a phenyl group, an amino C1-C3 alkyl group, a C2-C3 unsaturated aliphatic group (preferably a vinyl group or an allyl group), and a benzyl group. It may have a group.
- the adhesive of the present invention contains additives other than the silane coupling agent as long as the effects of the present invention are not impaired (for example, 0 to 20% of the total solid content with the coupling agent). Ordinarily, they may not be included.
- the protective film in the polarizing plate of the present invention is preferably subjected to various surface treatments for improving adhesion.
- a surface treatment is performed to make the adhesive surface hydrophilic. It is preferable.
- the surface treatment include solvent surface treatment, mechanical surface treatment, and electrical surface treatment, and electrical surface treatment is preferred.
- the electrical surface treatment include corona treatment, plasma treatment, atmospheric pressure discharge treatment, and ultraviolet ozone treatment.
- the degree of treatment varies depending on the material and surface state of the protective film to be used, but a protective film treated so that the contact angle of water on the protective film adhesion surface after treatment is about 0 to 20 degrees is preferable.
- a protective film treated so that the contact angle of water on the protective film adhesion surface after treatment is about 0 to 20 degrees is preferable.
- corona treatment or plasma treatment is preferable, and corona treatment is particularly preferable.
- a synthetic resin film is usually used as the protective film.
- an acrylic resin film an olefin resin film (cycloolefin resin film or / and polyolefin resin film), a cellulose resin film, and a PET film (polyethylene terephthalate). Film) and the like.
- These protective films may be subjected to surface treatment such as antireflection treatment, antiglare treatment, and / or hard coat treatment on the surface opposite to the adhesive surface, if necessary.
- the protective film in the polarizing plate of the present invention preferably has a low moisture permeability, and the moisture permeability (JIS K7129B) (40 ° C., 90% RH) in a film having a thickness of 80 ⁇ m is 100 g / m 2 ⁇ 24 hr or less.
- the lower limit is not particularly limited.
- 100 to 0.1 g / m 2 ⁇ 24 hr can be mentioned, more preferably about 50 to 0.1 g / m 2 ⁇ 24 hr, still more preferably 35 to 0.1 g / m 2. ⁇ It is about 24 hours.
- an acrylic resin film or an olefin resin film is preferable.
- the homopolymer of (meth) acryl monomer ((meth) acrylic acid or (meth) acrylic acid ester), the copolymer of 2 or more types of (meth) acrylic monomers, or at least 1
- the film etc. which consist of a copolymer of a seed
- Examples of (meth) acrylic monomers include methacrylic acid esters such as cyclohexyl methacrylate, t-butyl cyclohexyl methacrylate, methyl methacrylate, and methyl acrylate, ethyl acrylate, butyl acrylate, isopropyl acrylate, acrylic acid 2 And methacrylic acid alkyl esters and acrylic acid alkyl esters, such as acrylic acid esters such as ethylhexyl.
- methacrylic acid esters such as cyclohexyl methacrylate, t-butyl cyclohexyl methacrylate, methyl methacrylate, and methyl acrylate, ethyl acrylate, butyl acrylate, isopropyl acrylate, acrylic acid 2 And methacrylic acid alkyl esters and acrylic acid alkyl esters, such as acrylic acid esters such as ethylhexyl.
- polymerizable monomers that can be copolymerized with the (meth) acrylic monomer include unsubstituted styrene, o-methylstyrene, p-methylstyrene, 2,4-dimethylstyrene, ethylstyrene, p-tert.
- -Aromatic vinyl compounds such as alkyl-substituted styrenes such as butylstyrene and ⁇ -alkyl-substituted styrenes such as ⁇ -methylstyrene and ⁇ -methyl-p-methylstyrene; vinyl cyanides such as acrylonitrile and methacrylonitrile And maleimides such as N-phenylmaleimide and N-cyclohexylmaleimide; unsaturated carboxylic acid anhydrides such as maleic anhydride; unsaturated acids such as maleic acid; and siloxane monomers. If necessary, two or more of these monomers can be used in combination.
- the olefin resin film examples include polyolefin resin films such as ethylene / propylene copolymers, and cycloolefin resin films such as norbornene resins.
- norbornene resins include norbornene (bicyclo (221) heptene-2, C1-C4 alkyl or C1-C4 alkoxy-5-bicyclo (221) heptene-2, bicyclo (221) heptene-2-5-carboxylic acid or Resins obtained by ring-opening or ring-opening copolymerization of norbornene monomers, such as esters of -5,6-dicarboxylic acid (for example, C1-C4 alkyl esters), resins obtained by addition polymerization of norbornene monomers, and norbornene monomers and ethylene
- Another example is a resin obtained by addition copolymerization with an olefin monomer such as an ⁇ -olefin (for example,
- cellulose-based resin film examples include cellulose acylate films (usually cellulose (C1-C4) acylate films) such as diacetyl cellulose, triacetyl cellulose, and cellulose acetate propionate.
- cellulose acylate films usually cellulose (C1-C4) acylate films
- diacetyl cellulose triacetyl cellulose
- cellulose acetate propionate examples of the cellulose-based resin film
- PET film any commercially available PET film can be used.
- the polarizing element (polarizer) used in the polarizing plate of the present invention is not particularly limited as long as it is an element having a function of polarizing light from a light source, and absorbs light in a specific direction to make polarized light.
- a polarizing element or a reflective polarizing element that reflects light in a specific direction into polarized light can be used.
- an absorptive polarizing element for example, a polarizing element obtained by uniaxially stretching a hydrophilic polymer film such as a polyvinyl alcohol film containing a dichroic dye such as a dye or polyvalent iodine ion, a polyvinyl alcohol film A polarizing element obtained by dehydrating with an acid before and after uniaxial stretching to form a polyene structure, and a solution of a dichroic dye that develops a lyotropic liquid crystal state on an alignment film that has been processed to align in a certain direction Examples thereof include a polarizing element obtained by applying and then removing the solvent.
- a reflective polarizing element for example, a polarizing element composed of a large number of laminated bodies having different birefringence, a polarizing element formed by combining a cholesteric liquid crystal having a selective reflection region and a quarter wavelength plate, and a substrate
- a polarizing element provided with a fine wire grid.
- a hydrophilic polymer such as a polyvinyl alcohol film containing a dichroic dye such as a dye or a polyvalent iodine ion, which has excellent polarization characteristics as a polarizing element.
- a polarizing element obtained by uniaxially stretching a film or a polarizing element obtained by forming a polyene structure by dehydration with an acid before and after uniaxial stretching of a polyvinyl alcohol film.
- the polarizing element can be manufactured by a conventional method. For example, in the case of a polarizing element comprising a polyvinyl alcohol film containing a dichroic dye such as a dye and polyvalent iodine ions, the polyvinyl alcohol film was first swollen with warm water and then the dichroic dye was dissolved. Immerse in a dyeing tank and dye the film. Next, the polarizing element can be obtained by stretching the dyed film uniaxially in a tank containing a crosslinking agent such as boric acid or borax and drying it.
- a crosslinking agent such as boric acid or borax
- dyes used for dyeing include iodine-potassium iodide aqueous solutions, azo compounds described in “Application of functional dyes” (supervised by Masahiro Irie, CMC Publishing) pages 98-100, and C.I. Ai. direct. Yellow 12, sea. Ai. direct. Yellow 28, Sea. Ai. direct. Yellow 44, Sea. Ai. direct. Orange 26, Sea. Ai. direct. Orange 39, sea. Ai. direct. Orange 107, sea. Ai. direct. Red 2, sea. Ai. direct. Red 31, sea. Ai. direct. Red 79, Sea. Ai. direct. Red 81, Sea. Ai. direct. Red 247, Sea. Ai. direct. Green 80, Sea. Ai. direct. Yellow 12, sea. Ai. direct. Yellow 12, sea. Ai. direct. Yellow 28, Sea. Ai. direct. Yellow 44, Sea. Ai. direct. Orange 26, Sea. Ai. direct. Orange 39, sea. Ai. direct. Orange 107, sea. Ai
- dichroic dyes are free acids, alkali metal salts (for example, Na salt, K salt and Li salt), ammonium salts, salts of amines, or complex salts (for example, Cu complex, Ni complex and Co complex). Etc.
- alkali metal salts for example, Na salt, K salt and Li salt
- ammonium salts for example, salts of amines
- complex salts for example, Cu complex, Ni complex and Co complex.
- Etc The performance of the polarizing element can be adjusted by the dichroism of the dichroic dye, the stretch ratio during stretching, and the like.
- the polarizing plate of the present invention can be obtained by laminating the protective film on at least one side of the polarizing element, usually on both sides, using the adhesive and then drying.
- the drying conditions vary depending on the concentration of the adhesive used and the moisture permeability of the protective film, but it is preferable to carry out the drying at 25 to 100 ° C. for about 10 to 150 minutes.
- the polarizing plate of the present invention may be a protective film on at least one side, and may be a glass substrate or the like on the other side. Usually, it is a polarizing plate in which a protective film is bonded to both surfaces of the polarizing element with the adhesive.
- an adhesive layer is formed on at least one surface of the polarizing plate of the present invention thus obtained for bonding with another film or a liquid crystal cell.
- the pressure-sensitive adhesive used in the pressure-sensitive adhesive layer is not particularly limited as long as it is transparent and has no optical anisotropy, and any pressure-sensitive adhesive can be used, but an acrylic pressure-sensitive adhesive is preferably used.
- the manufacturing method of the polarizing plate of this invention is demonstrated.
- an aqueous adhesive containing a diallylamine-based polymer as an adhesive component is used. That is, the method for producing a polarizing plate of the present invention is characterized in that the protective film and the polarizing element are pressure-bonded in the presence of an aqueous adhesive containing a diallylamine-based polymer on the entire adhesive surface of both, and then dried. It is the manufacturing method of the polarizing plate to do.
- an aqueous adhesive containing a diallylamine polymer is present on the entire adhesive surface of both the protective film and the polarizing element.
- an adhesive is preliminarily present by a method such as coating on the entire adhesive surface of either one or both of the protective film and the polarizing element, or when pressure bonding, the adhesive is supplied between the two films.
- An adhesive may be present on the entire adhesive surface of the film at the time of pressure bonding.
- the polarizing plate of the present invention can be produced.
- any method may be used for pressure bonding, usually pressure bonding between rolls is preferable.
- the amount of the adhesive on the film surface varies depending on the kind of film as appropriate, but is approximately 0.04 to 0.4 g / m 2 , preferably 0.06 to 0.4 by weight of the diallylamine polymer in the adhesive. It is about 0.4 g / m 2 .
- drying is preferably performed at 25 to 100 ° C. for about 10 to 150 minutes.
- Any protective film can be used as long as it is a protective film for a polarizing plate including the above-described resin film.
- aqueous adhesive containing the diallylamine polymer used in this production method is the same as the aqueous adhesive described in the explanation of the polarizing plate of the present invention. Therefore, a more preferable aqueous adhesive contains a silane coupling agent, preferably an amine-based silane coupling agent, in addition to the diallylamine polymer.
- the preferable composition ratio and the like are also the same as the composition ratio described in the section of the polarizing plate, and detailed description thereof is omitted here by referring to it.
- the polarizing element used for this manufacturing method is the same as the polarizing element demonstrated by description of the polarizing plate of the said invention. By referring to it, detailed description is omitted here.
- the preferred polarizing plate of the present invention obtained as described above is a polarizing element having at least one side of a polarizing element, an adhesive layer containing a diallylamine-based polymer in close contact with the surface, and a protective film in close contact with the adhesive layer. It has a three-layer structure.
- the other side of the polarizing element may be the same as described above, or may have another configuration. More preferably, it is a polarizing plate having the above-described configuration on both sides of the polarizing element.
- the image display device of the present invention By disposing the polarizing plate of the present invention in the light path of the image display device, for example, on at least one side of the liquid crystal cell of the liquid crystal display device, the image display device of the present invention, for example, the liquid crystal display device can be obtained.
- the liquid crystal display device has various modes depending on the type of the liquid crystal cell to be used.
- the polarizing plate of the present invention can be used.
- VA vertical alignment
- IPS in-plane switching
- OCB optical compensated bend
- TN twisted nematic
- STN super twisted nematic
- the polarizing plate of this invention can be used for an apparatus.
- a retardation film for improving viewing angle characteristics and contrast may be inserted between the polarizing plate of the present invention and the liquid crystal cell.
- the polarizing plate of the present invention can be suitably used for a liquid crystal projector. In that case, it is normally used as a color polarizing plate for a liquid crystal cell that performs switching with respect to the respective light sources of red, green, and blue.
- Example 1 Preparation of adhesive> An aqueous solution containing a hydrochloride of epichlorohydrin-modified methyl diallylamine polymer (manufactured by Senka Corporation, trade name: Unisense KCA101L, solid content concentration 20%) was used as the adhesive of the present invention. In use, the aqueous solution was diluted with water to adjust the solid content concentration to 11%. To the resulting solution, 3% of N- ⁇ (aminoethyl) - ⁇ -aminopropyltrimethoxysilane (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: KBM-603) is added to the polymer.
- N- ⁇ (aminoethyl) - ⁇ -aminopropyltrimethoxysilane manufactured by Shin-Etsu Chemical Co., Ltd., trade name: KBM-603
- the adhesive agent of this invention containing a ring agent. Furthermore, 5% sodium hydroxide with respect to the polymer was added thereto as an aqueous solution and stirred well to obtain an aqueous adhesive solution used for adhesion of the protective film.
- ⁇ Preparation of polarizing plate> A corona generator with an output of 0.25 kW and a speed of 5 m / min using a CORONA GENERATOR (AGF-B10, manufactured by Asahi Kasei Chemicals Co., Ltd., HV film) with an acrylic resin film having a thickness of 80 ⁇ m. By processing, the protective film by which the adhesive surface was corona-treated was obtained.
- a polarizing element As a polarizing element, a polarizing element obtained by stretching a polyvinyl alcohol-based resin film adsorbing a dichroic dye (manufactured by Polatechno Co., Ltd., SHC polarizing element) was subjected to corona treatment of the two protective films obtained above. The adhesive solution obtained above was applied to the surface, the polarizing element was sandwiched between the coated surfaces, and protective films were adhered to both surfaces of the polarizing element. Subsequently, the polarizing plate of this invention was obtained by heating at 70 degreeC for 30 minutes, and drying.
- Example 2 A polarizing plate of the present invention was obtained in the same manner as in Example 1 except that a 40 ⁇ m-thick norbornene-based resin film (manufactured by Zeon Corporation, trade name Zeonor) was used as the protective film.
- a 40 ⁇ m-thick norbornene-based resin film manufactured by Zeon Corporation, trade name Zeonor
- Example 3 After using an alkali-treated 80 ⁇ m thick triacetylcellulose film (Fuji Photo Film Co., Ltd., trade name: TD-80U) (TAC film) as a protective film, A polarizing plate of the present invention was obtained in the same manner as in Example 1 except that drying was performed at 70 ° C. for 10 minutes.
- TAC film triacetylcellulose film
- Comparative Example 1 A comparative polarizing plate was obtained in the same manner as in Example 1 except that a 4% aqueous solution of PVA glue (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name: Gohsenol NH-26) was used as the adhesive.
- PVA glue manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name: Gohsenol NH-26
- Comparative Example 2 Composition in which 0.8% of Glyoxal (manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) as a crosslinking agent is added to an 8% aqueous solution of PVA glue (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name: GOHSEIMER Z-200) as an adhesive.
- a comparative polarizing plate was obtained by the same operation as in Example 2 except that an adhesive consisting of:
- Comparative Example 3 Composition in which 0.8% of Glyoxal (manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) as a crosslinking agent is added to an 8% aqueous solution of PVA glue (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name: GOHSEIMER Z-200) as an adhesive.
- a comparative polarizing plate was obtained by the same operation as in Example 3 except that an adhesive consisting of:
- the polarizing plate of the present invention is excellent in high-humidity heat resistance in any of the acrylic resin film, norbornene resin film, and TAC film.
- the polarizing plate of Comparative Example 1 does not have sufficient high-humidity heat resistance.
- Comparative Examples 2 and 3 and Examples 2 and 3 of the present invention when the adhesive of the present invention is used, both the norbornene resin film and the TAC film are sufficient. It can be seen that, when the conventional PVA paste is used, sufficient water resistance cannot be obtained.
- the polarizing plate using the adhesive of the present invention has high humidity heat resistance and water resistance even when an acrylic resin film or a norbornene resin film, which has been considered to have poor adhesion, is used as a protective film. Excellent. Therefore, compared with a TAC film, a resin film that is superior in durability and the like can be used as a protective film, and the performance and durability of a polarizing plate, for example, mechanical strength such as birefringence, moisture permeability, and friction resistance, high Durability such as moisture resistance and water resistance can be improved or improved.
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Abstract
Description
近年、偏光板の諸特性に対する要求は高く、例えば、偏光特性の向上、複屈折性の低減、全光線透過率の向上、透湿度の制御、機械的強度(鉛筆硬度、耐摩擦性)の向上、耐久性の向上などの更なる改善が求められている。これらの要求に応えるため、偏光素子と保護フィルムの改良が進められている。例えば、保護フィルムについては通常用いられてきたTACより、機械的強度及び耐久性の高いオレフィン系樹脂フィルム(ノルボルネンフィルム等のシクロオレフィン系樹脂フィルム及びポリプロピレン等のポリオレフィン系樹脂フィルム)、アクリル系樹脂フィルム、ビニルエステル樹脂フィルム等を保護フィルムとして用いることが検討されている。
(1)保護フィルムと偏光素子とをジアリルアミン系重合物を含む接着剤で接着したことを特徴とする偏光板、
(2)保護フィルムが、アクリル系樹脂からなるフィルム、、オレフィン系樹脂からなるフィルム、セルロース系樹脂からなるフィルム及びPETフィルムのいずれか1つであることを特徴とする上記(1)に記載の偏光板、
(3)ジアリルアミン系重合物が、ジアリルアミン系化合物の単独重合物又はジアリルアミン系化合物の共重合物であることを特徴とする上記(1)~(2)のいずれか一項に記載の偏光板、
(4)ジアリルアミン系重合物がエピハロヒドリン変性ジアリルアミン系重合物であることを特徴とする上記(1)~(3)のいずれか一項に記載の偏光板、
(5)保護フィルムの偏光素子側の接着面がコロナ処理またはプラズマ処理されていることを特徴とする上記(1)~(4)のいずれか一項に記載の偏光板、
(6)接着剤が、アミン系シランカップリング剤を含有していることを特徴とする上記(1)~(5)のいずれか一項に記載の偏光板、
(7)偏光素子が二色性色素を含有するポリビニルアルコール系樹脂フィルムよりなる上記(1)~(6)のいずれか一項に記載の偏光板、
(9)ジアリルアミン系重合物を、接着剤全量に対して、5~25重量%濃度で含む偏光板用水性接着剤、
(10)ジアリルアミン系重合物がエピハロヒドリン変性ジアリルアミン系重合物である上記(9)に記載の偏光膜用水性接着剤、
(11)更に、アミン系シランカップリング剤を含有する上記(9)又は(10)に記載の偏光膜用水性接着剤、
(12)保護フィルムと偏光素子とを、両者の接着面全面にジアリルアミン系重合物を含む水性接着剤の存在下に圧着し、次いで乾燥することを特徴とする偏光板の製造方法、
(13)ジアリルアミン系重合物及びアミン系シランカップリング剤を含有する樹脂膜用接着剤、
(14)厚さ80μmのフィルムで、保護フィルムの透湿度(JIS K7129B)が100~0.1g/m2・24hr以下である上記(1)~(6)に記載の偏光板、
に関する。
本発明の偏光板は、保護フィルムと偏光素子とを、ジアリルアミン系重合物を接着性成分として含む水性接着剤を用いて接着することにより得ることができる。
本発明の偏光板に用いる接着剤は、ジアリルアミン系重合物を含む組成物であり、通常水性組成物である。
本発明におけるジアリルアミン系重合物(ジアリルアミン化合物重合体)としては、ジアリルアミン系化合物(ジアリルアミン化合物)の単独重合体、ジアリルアミン系化合物の共重合体又はそれらの変性体の何れでもよい。通常ジアリルアミン系化合物の重合体(単独重合体又は共重合体)の変性体としては、例えばハロゲノエポキシ変性ジアリルアミン系重合物が好ましく、より好ましくはエピハロヒドリン変性体、特にエピクロルヒドリン変性体(以下エピハロヒドリン又はエピクロルヒドリン変性ジアリルアミン系重合物ともいう)が好ましい。
ジアリルアミン系化合物の共重合体としては、後記ジアリルアミン系化合物を主成分として含む共重合体が好ましい。好ましい共重合体の1つは上記ジアリルアミン系化合物の少なくとも2種が共重合した共重合体である。ジアリルアミン系化合物以外の他の重合性成分を含む共重合体としては、例えば、上記ジアリルアミン系化合物の少なくとも1種と、(メタ)アクリル酸(アクリル酸又はメタクリル酸)又はその塩、(メタ)アクリルアミド(アクリルアミド又はメタクリルアミド)又はその塩など(メタ)アクリル基を有する化合物との共重合物が挙げられる。これらの他の重合性成分を含む共重合体中におけるこれらの他の重合性成分の含量(モル割合)は共重合体全体に対して、0~40モル%、より好ましくは0~20モル%、更に好ましくは0~10モル%であり、残部がジアリルアミン系化合物成分である。
ハロゲノエポキシ変性ジアリルアミン系重合物としては、ジアリルアミン系化合物の単独重合体又は共重合体を、エピハロヒドリン等のハロゲノグリシジル化合物と反応させて得られる変性体を挙げることでき、より好ましくは、エピクロロヒドリン変性体である。
好ましいジアリルアミン系化合物としては下記式(a)
(CH2=CR-CH2)2N(R1)n (a)
(式中、Rは水素原子又はメチル基、R1はC1~C4アルキル基、nは0~2の整数を表し、nが2のとき、R1は同一であっても又は異なっていてもよい)
で表される化合物又はその塩(付加塩)を挙げることができる。
上記の(メタ)アリル基を窒素原子上に2つ有する2級アミン(上記式(a)のnが0の時)又はその塩としては、ジアリルアミンまたはジメタリルアミン及びその無機または有機酸塩が挙げられる。該無機または有機酸塩としては、上記アミンの塩酸塩、硫酸塩、リン酸塩、酢酸塩、及び、シュウ酸塩などを挙げることができる。
また、上記の窒素原子上に(メタ)アリル基を2つ有する4級アンモニウム塩(上記式(a)のnが2の時)としては、ジアリルジメチルアンモニウム塩及びジアリルジエチルアンモニウム塩などのジアリルジ(C1-C4アルキル)アンモニウムイオンと無機または有機イオンとの塩が挙げられ、具体的には、ジアリルジメチルアンモニウムクロライド、ジアリルジメチルアンモニウムブロマイド、ジアリルジエチルアンモニウムクロライド、ジアリルジブチルアンモニウムクロライド、及びジアリルメチルエチルアンモニウムクロライドなどが挙げられる。
好ましいジアリルアミン系重合体としては、ジアリルモノ又はジ(C1-C4アルキル)アミン重合体及びそのエピハロヒドリン変性体を挙げることができる。該重合体はジアリルモノ又はジ(C1-C4アルキル)アミンの1種からなる重合体または2種以上からなる共重合体のいずれであってもよい。より好ましくはジアリルC1-C4アルキルアミンの重合体およびそのエピハロヒドリン変性体である。
本発明におけるジアリルアミン系重合物は、水溶性の高分子であり、該高分子の数平均分子量は100~1,000,000程度、好ましくは1,000~500,000程度、より好ましくは10,000~100,000程度、更に好ましくは30,000~100,000程度である。
好ましい任意の添加剤としては、カップリング剤、好ましくはアミン系シランカップリング剤を挙げることができる。該カップリング剤の添加量は、接着剤中のジアリルアミン系重合物に対して、0~20重量%、好ましくは0~10重量%、更に好ましくは、0~6重量%である。
カップリング剤の効果を十分に出すためには、接着剤中のジアリルアミン系重合物に対して、好ましくは0.5重量%以上、より好ましくは1重量%以上であって、かつ、上記範囲の上限以下の該カップリング剤を添加するのが好ましい。
従って、より好ましい接着剤は、ジアリルアミン系重合物を、接着剤全量に対して、1.0~40重量%、好ましくは2~30重量%、より好ましくは5~25重量%、更に好ましくは8~20重量%含み、カップリング剤、好ましくはアミン系シランカップリング剤を、ジアリルアミン系重合物に対して、0.5~20重量%、好ましくは1~10重量%、より好ましくは1~6重量%含み、残部が水である。
以下、本明細書において「%」と記載した場合、特に断らない限り重量%を表す。
本発明の接着剤は、接着性成分であるジアリルアミン系重合物が酸との塩、通常塩酸などとの塩となっているので、使用時に、塩基性水溶液で活性化させて用いるのが好ましい。好ましい塩基性水溶液としては、例えば、水酸化ナトリウム、水酸化カリウム、水酸化カルシウム、水酸化バリウム及び水酸化セシウムなどのアルカリ金属水酸化物等の塩基性化合物の水溶液が挙げられる。通常は水酸化ナトリウム又は水酸化カリウム等の水溶液が好ましい。
該塩基性化合物の添加量はジアリルアミン系重合物に付加する酸を中和でき、ジアリルアミン系重合物をフリーの状態にできる量が好ましい。通常は該接着剤中のジアリルアミン系重合物の全量に対して、塩基性化合物の量で、1.0~30%、好ましくは3~10%の水溶液を添加するのがよい。
アミン系シランカップリング剤の具体例としては例えば、N-β-(N-ビニルベンジルアミノエチル)-γ-アミノプロピルトリメトキシシラン塩酸塩(東レ・ダウコーニング株式会社製、商品名:SZ-6032)、γ-アミノプロピルトリメトキシシラン(東レ・ダウコーニング株式会社製、商品名:SZ-6083)、γ-ジアリルアミノプロピルトリメトキシシラン(東レ・ダウコーニング株式会社製、商品名:AX43-065)、N-β(アミノエチル)-γ-アミノプロピルメチルジメトキシシラン(信越化学工業株式会社製、商品名:KBM-602)、N-β(アミノエチル)-γ-アミノプロピルトリメトキシシラン(信越化学工業株式会社製、商品名:KBM-603)、N-β(アミノエチル)-γ-アミノプロピルトリエトキシシラン(信越化学工業株式会社製、商品名:KBE-603)、γ-アミノプロピルトリメトキシシラン(信越化学工業株式会社製、商品名:KBM-903)、γ-アミノプロピルトリエトキシシラン(信越化学工業株式会社製、商品名:KBE-903)、N-フェニル-γ-アミノプロピルトリメトキシシラン(信越化学工業株式会社製、商品名:KBM-573)、γ-(2-アミノエチル)アミノプロピルトリメトキシシラン(東レ・ダウコーニング株式会社製、商品名:SH6020)、及び、γ-(2-アミノエチル)アミノプロピルメチルジメトキシシラン(東レ・ダウコーニング株式会社製、商品名:SH6023)等のアミノプロピルトリ(C1~C3アルコキシ)シラン化合物又はアミノプロピルジ(C1~C3アルコキシ)C1~C3アルキルシラン化合物が挙げられる。該シラン化合物のアミノ基は、フェニル基、アミノC1~C3アルキル基、C2~C3不飽和脂肪族基(好ましくはビニル基又はアリル基)及びベンジル基からなる群から選ばれる1~2個の置換基を有してもよい。
上記本発明の接着剤には、本発明の効果を損なわない範囲(例えばカップリング剤との合計で、固形分全量に対して0~20%)で、シランカップリング剤以外の添加剤を含有してもよいが、通常はそれらを含まなくてよい。
該表面処理としては、例えば、溶剤表面処理、機械的表面処理および電気的表面処理などが挙げられ、電気的表面処理が好ましい。電気的表面処理としては、例えば、コロナ処理、プラズマ処理、大気圧放電処理および紫外線オゾン処理などが挙げられる。処理の程度は用いる保護フィルムの材質及び表面状態等によって異なるが、処理後の保護フィルム接着面の水の接触角が0度以上20度以下程度になるように処理された保護フィルムが好ましい。上記電気的表面処理では、コロナ処理又はプラズマ処理が好ましく、コロナ処理がとくに好ましい。
本発明における偏光板における保護フィルムとしては、透湿度の低いものが好ましく、厚さ80μmのフィルムでの透湿度(JIS K7129B)(40℃、90%RH)が100g/m2・24hr以下のものが好ましく、下限は特に制限は無い。例えば実用的には100~0.1g/m2・24hr程度のものを挙げることができ、より好ましくは50~0.1g/m2・24hr程度、更に好ましくは35~0.1g/m2・24hr程度のものである。透湿度及び/又は耐久性の面から、アクリル系樹脂フィルム、又はオレフィン系樹脂フィルムが好ましい。
(メタ)アクリルモノマーとしては例えば、メタクリル酸シクロヘキシル、メタクリル酸t-ブチルシクロヘキシル、メタクリル酸メチル等のメタクリル酸エステル、及び、アクリル酸メチル、アクリル酸エチル、アクリル酸ブチル、アクリル酸イソプロピル、アクリル酸2-エチルヘキシル等のアクリル酸エステル等の、メタクリル酸アルキルエステル類及びアクリル酸アルキルエステル類等を挙げることができる。
また、上記(メタ)アクリルモノマーと共重合させることのできる他の重合性モノマーとしては、無置換スチレン、o-メチルスチレン、p-メチルスチレン、2,4-ジメチルスチレン、エチルスチレン、p-tert-ブチルスチレン等のアルキル置換スチレン、及び、α-メチルスチレン,α-メチル-p-メチルスチレン等のα-アルキル置換スチレン等の芳香族ビニル化合物類;アクリロニトリル及びメタクリロニトリル等のシアノ化ビニル類;N-フェニルマレイミド及びN-シクロヘキシルマレイミド等のマレイミド類;無水マレイン酸等の不飽和カルボン酸無水物類;マレイン酸等の不飽和酸類;及び、シロキサン系モノマー等を挙げることができる。必要に応じてこれらのモノマーは2種以上併用することもできる。
また、PETフィルムとしては,市販のPETフィルムを何れも使用することができる。
染色に使用する色素としては、ヨウ素-ヨウ化カリウム水溶液、『機能性色素の応用』(入江正浩監修、シーエムシー出版)98-100頁に記載のアゾ系化合物、シー.アイ.ダイレクト.イエロー12、シー.アイ.ダイレクト.イエロー28、シー.アイ.ダイレクト.イエロー44、シー.アイ.ダイレクト.オレンジ26、シー.アイ.ダイレクト.オレンジ39、シー.アイ.ダイレクト.オレンジ107、シー.アイ.ダイレクト.レッド2、シー.アイ.ダイレクト.レッド31、シー.アイ.ダイレクト.レッド79、シー.アイ.ダイレクト.レッド81、シー.アイ.ダイレクト.レッド247、シー.アイ.ダイレクト.グリーン80、シー.アイ.ダイレクト.グリーン59、並びに、特開2001-33627、特開2002-296417、特開2003-215338、WO2004/092282、特開2001-0564112、特開2001-027708、特開平11-218611、特開平11-218610及び特開昭60-156759号公報に記載された有機染料等が挙げられる。これらの二色性色素は遊離酸の他、アルカリ金属塩(例えばNa塩、K塩及びLi塩等)、アンモニウム塩、アミン類の塩、又は錯塩(例えばCu錯体、Ni錯体及びCo錯体等)等が挙げられる。偏光素子の性能は二色性色素の持つ二色性や延伸時の延伸倍率等で調整することができる。
通常は、こうして得られた本発明の偏光板の少なくとも片面には、他のフィルム又は液晶セルと貼り合せるために、粘着層が形成される。粘着層に使用される粘着剤としては、透明で、光学異方性が無ければ、特に制限は無く何れの粘着剤も使用できるが、アクリル系粘着剤が好適に用いられる。
この偏光板の製造方法の発明においても、上記の偏光板の発明と同様に、ジアリルアミン系重合物を接着成分として含む水性接着剤を使用することを特徴とする。
即ち、本発明の偏光板の製造方法は、保護フィルムと偏光素子とを、両者の接着面全面にジアリルアミン系重合物を含む水性接着剤の存在下に、圧着し、次いで乾燥することを特徴とする偏光板の製造方法である。
保護フィルムと偏光素子の両者の接着面全面に、ジアリルアミン系重合物を含む水性接着剤を存在させる方法は特に限定はない。例えば、保護フィルムと偏光素子の何れか一方若しくは両方の接着面全面に、塗布等の方法で予め接着剤を存在させても、また、圧着する際に、両フィルム間に接着剤を供給し、圧着時にフィルムの接着面全面に接着剤が存在するようにしてもよい。そのようにして、保護フィルムと偏光素子の両者の接着面全面に、ジアリルアミン系重合物を含む水性接着剤が存在する状態で、両フィルムをロール等で、通常は常温で圧着し、次いで乾燥することにより、本発明の偏光板を製造することができる。圧着は何れの方法でもよいが、通常はロール間での圧着が好ましい。フィルム表面への接着剤の量は、適宜フィルムの種類等により異なるが、接着剤中のジアリルアミン系重合物の重量で、ほぼ、0.04~0.4g/m2、好ましくは0.06~0.4g/m2程度である。
乾燥は前記したように25~100℃で10~150分程度行うのが好ましい。
この製造方法に使用される保護フィルムは前記した樹脂フィルムを含め、偏光板の保護フィルムであれば何れも使用できる。
この製造方法で使用されるジアリルアミン系重合物を含む水性接着剤は、上記本発明の偏光板の説明で説明した水性接着剤と同じである。従って、より好ましい水性接着剤はジアリルアミン系重合物の他に、更に、シランカップリング剤、好ましくはアミン系シランカップリング剤を含むものである。好ましい組成割合等についても、偏光板の項で説明した組成割合等と同じであるので、それを参照とすることで、ここでは詳しい説明を省略する。
また、この製造方法に使用される偏光素子は、上記本発明の偏光板の説明で説明した偏光素子と同じである。それを参照とすることで、ここでは詳しい説明を省略する。
上記の様にして得られる好ましい本発明の偏光板は、少なくとも偏光素子の片側が、偏光素子、その表面に密着したジアリルアミン系重合物を含む接着剤層及びその接着剤層に密着した保護フィルムの3層の構成を有するものである。偏光素子の他の側は、上記と同じであっても、また、他の構成であってもよい。より好ましくは偏光素子の両側が上記構成になった偏光板である。
なお、本発明の偏光板と液晶セルとの間に、視野角特性やコントラストを改善するための位相差フィルムを挿入しても良い。
本発明の偏光板は液晶プロジェクターに好適に用いることができる。その場合には、通常、赤、緑及び青のそれぞれの光源に対してスイッチングを行う液晶セル用のカラー偏光板として使用される。
<接着剤の調製>
エピクロロヒドリン変性メチルジアリルアミン重合物の塩酸塩を含む水溶液(センカ株式会社製、商品名:ユニセンスKCA101L、固形分濃度20%)を本発明の接着剤として使用した。使用に際して、該水溶液を水で希釈して固形分濃度を11%に調整した。得られた溶液に、該重合体に対して3%のN-β(アミノエチル)-γ-アミノプロピルトリメトキシシラン(信越化学工業株式会社製、商品名:KBM-603)を加えて、カップリング剤を含む本発明の接着剤とした。更に、そこに該重合体に対して5%の水酸化ナトリウムを、水溶液で添加し、よく攪拌して、保護フィルム接着に使用する接着剤水溶液とした。
<偏光板の作製>
厚さ80μmのアクリル系樹脂フィルム(旭化成ケミカルズ株式会社製、HVフィルム)にCORONA GENERATOR(春日電機株式会社製、AGF-B10)にて、出力0.25kW、速度5m/minを5Passの条件でコロナ処理することにより、接着面のコロナ処理された保護フィルムを得た。偏光素子として、二色性染料を吸着させたポリビニルアルコール系樹脂フィルムを延伸してなる偏光素子(株式会社ポラテクノ製、SHC偏光素子)を用い、上記で得た2枚の保護フィルムのコロナ処理した面に、前記で得た接着剤溶液を塗布して、該塗布面で偏光素子を挟持し、偏光素子の両面に保護フィルムを接着した。次いで70℃で30分加熱して乾燥することにより、本発明の偏光板を得た。
保護フィルムとして厚さ40μmのノルボルネン系樹脂フィルム(日本ゼオン株式会社製、商品名Zeonor)を用いる以外は実施例1と同様の操作により本発明の偏光板を得た。
アルカリ処理を施した膜厚80μmのトリアセチルセルロースフィルム(富士写真フィルム株式会社製、商品名:TD-80U)(TACフィルム)を保護フィルムとして用い、偏光素子の両側に保護フィルムを貼付した後の乾燥を、70℃で10分間行う以外は実施例1と同様にして、本発明の偏光板を得た。
接着剤としてPVA糊(日本合成化学工業株式会社製、商品名:ゴーセノールNH-26)4%水溶液を用いる以外は実施例1と同様の操作を行い、比較用の偏光板を得た。
実施例1~3、比較例1で作製した偏光板について、各偏光板サンプルの40mm×40mm片を湿熱条件85℃85%RH下に100時間放置し、剥れの有無を肉眼で観察した。その観察結果を表1に示す。
接着剤として、PVA糊(日本合成化学工業株式会社製、商品名:ゴーセファイマーZ-200)8%水溶液に架橋剤としてグリオキザール(日本合成化学工業株式会社製)を0.8%添加した組成からなる接着剤を用いる以外は実施例2と同様の操作により、比較用の偏光板を得た。
接着剤として、PVA糊(日本合成化学工業株式会社製、商品名:ゴーセファイマーZ-200)8%水溶液に架橋剤としてグリオキザール(日本合成化学工業株式会社製)を0.8%添加した組成からなる接着剤を用いる以外は実施例3と同様の操作により、比較用の偏光板を得た。
実施例2~3、比較例2~3で作製した偏光板について、各偏光板サンプルの40mm×40mm片を60℃の温水に水没させて400時間放置し、剥れの有無を肉眼で確認した。その観察結果を表2に示す。
また、比較例2及び3と本願発明の実施例2及び3との比較から明らかなように、本発明の接着剤を用いた場合には、ノルボルネン系樹脂フィルム及びTACフィルムの何れにおいても、充分な耐水性を有するのに対して、従来のPVA糊を用いた場合には、充分な耐水性が得られないことが判る。
Claims (14)
- 保護フィルムと偏光素子とをジアリルアミン系重合物を含む接着剤で接着したことを特徴とする偏光板。
- 保護フィルムが、アクリル系樹脂からなるフィルム、オレフィン系樹脂からなるフィルム、セルロース系樹脂からなるフィルム及びPETフィルムのいずれか1つであることを特徴とする請求項1に記載の偏光板。
- ジアリルアミン系重合物が、ジアリルアミン系化合物の単独重合物又はジアリルアミン系化合物の共重合物であることを特徴とする請求項1に記載の偏光板。
- ジアリルアミン系重合物が、エピハロヒドリン変性ジアリルアミン系重合物であることを特徴とする請求項1に記載の偏光板。
- 保護フィルムの偏光素子側の接着面がコロナ処理またはプラズマ処理されていることを特徴とする請求項1に記載の偏光板。
- 接着剤が、アミン系シランカップリング剤を含有していることを特徴とする請求項1に記載の偏光板。
- 偏光素子が二色性色素を含有するポリビニルアルコール系樹脂フィルムよりなる請求項1に記載の偏光板。
- 請求項1~7のいずれか一項に記載の偏光板を有することを特徴とする画像表示装置。
- ジアリルアミン系重合物を、接着剤全量に対して、5~25重量%濃度で含む偏光板用水性接着剤。
- ジアリルアミン系重合物がエピハロヒドリン変性ジアリルアミン系重合物である請求項9に記載の偏光板用水性接着剤。
- 更に、アミン系シランカップリング剤を含有する請求項9又は10に記載の偏光板用水性接着剤。
- 保護フィルムと偏光素子とを、両者の接着面全面にジアリルアミン系重合物及びシランカップリング剤を含む水性接着剤の存在下に圧着し、次いで乾燥することを特徴とする偏光板の製造方法。
- ジアリルアミン系重合物及びアミン系シランカップリング剤を含有する樹脂膜用接着剤。
- 厚さ80μmのフィルムで、保護フィルムの透湿度(JIS K7129B)が100~0.1g/m2・24hr以下である請求項1に記載の偏光板。
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009801405905A CN102177450A (zh) | 2008-10-14 | 2009-10-09 | 偏振板 |
| JP2010533813A JPWO2010044232A1 (ja) | 2008-10-14 | 2009-10-09 | 偏光板 |
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| JP2008265499 | 2008-10-14 | ||
| JP2008-265499 | 2008-10-14 |
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| JP (1) | JPWO2010044232A1 (ja) |
| KR (1) | KR20110069813A (ja) |
| CN (1) | CN102177450A (ja) |
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| WO (1) | WO2010044232A1 (ja) |
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| JP2020166097A (ja) * | 2019-03-29 | 2020-10-08 | 株式会社ポラテクノ | シリカ層を有する偏光板、及びその製造方法 |
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| CN114035257B (zh) * | 2021-09-30 | 2024-06-11 | 恒美光电股份有限公司 | 一种强耐候性偏光板及其制备方法 |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0269588A (ja) * | 1988-07-18 | 1990-03-08 | Henkel Kgaa | 接着剤 |
| JPH03244685A (ja) * | 1990-02-23 | 1991-10-31 | Toyo Ink Mfg Co Ltd | 感圧性接着剤 |
| JP2003105288A (ja) * | 2001-09-28 | 2003-04-09 | Oji Paper Co Ltd | 感圧接着シート |
| JP2004148811A (ja) * | 2002-10-08 | 2004-05-27 | Fuji Photo Film Co Ltd | セルロースアシレートフイルムの製造方法、セルロースアシレートフイルム、並びにそれを用いた光学機能性シート、偏光板、液晶表示装置及びハロゲン化銀写真感光材料 |
| JP2007224157A (ja) * | 2006-02-23 | 2007-09-06 | Aica Kogyo Co Ltd | 接着剤組成物 |
-
2009
- 2009-10-09 CN CN2009801405905A patent/CN102177450A/zh active Pending
- 2009-10-09 JP JP2010533813A patent/JPWO2010044232A1/ja active Pending
- 2009-10-09 WO PCT/JP2009/005269 patent/WO2010044232A1/ja not_active Ceased
- 2009-10-09 KR KR1020117008512A patent/KR20110069813A/ko not_active Ceased
- 2009-10-13 TW TW098134577A patent/TW201027148A/zh unknown
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0269588A (ja) * | 1988-07-18 | 1990-03-08 | Henkel Kgaa | 接着剤 |
| JPH03244685A (ja) * | 1990-02-23 | 1991-10-31 | Toyo Ink Mfg Co Ltd | 感圧性接着剤 |
| JP2003105288A (ja) * | 2001-09-28 | 2003-04-09 | Oji Paper Co Ltd | 感圧接着シート |
| JP2004148811A (ja) * | 2002-10-08 | 2004-05-27 | Fuji Photo Film Co Ltd | セルロースアシレートフイルムの製造方法、セルロースアシレートフイルム、並びにそれを用いた光学機能性シート、偏光板、液晶表示装置及びハロゲン化銀写真感光材料 |
| JP2007224157A (ja) * | 2006-02-23 | 2007-09-06 | Aica Kogyo Co Ltd | 接着剤組成物 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020166097A (ja) * | 2019-03-29 | 2020-10-08 | 株式会社ポラテクノ | シリカ層を有する偏光板、及びその製造方法 |
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| JPWO2010044232A1 (ja) | 2012-03-15 |
| KR20110069813A (ko) | 2011-06-23 |
| TW201027148A (en) | 2010-07-16 |
| CN102177450A (zh) | 2011-09-07 |
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