WO2016121794A1 - 粘着剤組成物および粘着シート - Google Patents
粘着剤組成物および粘着シート Download PDFInfo
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- WO2016121794A1 WO2016121794A1 PCT/JP2016/052275 JP2016052275W WO2016121794A1 WO 2016121794 A1 WO2016121794 A1 WO 2016121794A1 JP 2016052275 W JP2016052275 W JP 2016052275W WO 2016121794 A1 WO2016121794 A1 WO 2016121794A1
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- sensitive adhesive
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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
- 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
- C09J133/14—Homopolymers or copolymers of esters of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen
-
- 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
- C09J11/04—Non-macromolecular additives inorganic
-
- 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
- C09J11/08—Macromolecular additives
-
- 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
-
- 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
Definitions
- the present invention relates to a pressure-sensitive adhesive composition and a pressure-sensitive adhesive sheet. Specifically, the present invention relates to a pressure-sensitive adhesive composition in which metal oxide particles are dispersed with a dispersant, and a pressure-sensitive adhesive sheet obtained using the pressure-sensitive adhesive composition. .
- an optical member such as a protective film is laminated on the surface of various display devices, touch panel devices, etc. via an adhesive layer.
- the pressure-sensitive adhesive layer usually requires adhesiveness and optical properties (haze, total light transmittance, etc.).
- an adhesive composition containing metal oxide particles, a polymer resin and a dispersant is known, and more specifically, for example, metal oxide particles, a polymer resin and a dispersant.
- the metal oxide particles are made of at least one selected from the group consisting of titanium oxide, zirconium oxide, zinc oxide, niobium pentoxide and titanate compounds, and the average particle size is 20 to 150 nm.
- the pressure-sensitive adhesive composition it is required to improve excellent optical properties, particularly haze, while ensuring excellent adhesiveness.
- an object of the present invention is to provide a pressure-sensitive adhesive composition excellent in dispersibility of metal oxide particles, excellent in optical properties (haze, total light transmittance) and excellent in adhesiveness, and the pressure-sensitive adhesive composition. It is providing the adhesive sheet obtained by using.
- the pressure-sensitive adhesive composition of the present invention contains (A) (meth) acrylic resin, (B) dispersant, and (C) metal oxide particles, and the (B) dispersant has an ionic group. And a (meth) acrylic resin having a weight average molecular weight of 200 to 50,000.
- the ionic group is a phosphate group and the (C) metal oxide particles are zirconium oxide and / or titanium oxide.
- the ionic group is a tertiary amino group
- the (C) metal oxide particles are antimony-doped tin oxide.
- the pressure-sensitive adhesive sheet of the present invention is characterized in that the above-mentioned pressure-sensitive adhesive composition is formed into a layer shape.
- the pressure-sensitive adhesive composition of the present invention contains (A) (meth) acrylic resin, (B) dispersant, and (C) metal oxide particles, and (B) dispersant has an ionic group. And since it consists of a (meth) acryl resin with a weight average molecular weight of 200 or more and 50000 or less, (C) metal oxide particles can be dispersed well, and excellent adhesiveness and optical properties can be obtained.
- the pressure-sensitive adhesive sheet of the present invention is obtained using the pressure-sensitive adhesive composition of the present invention, it is excellent in dispersibility of metal oxide particles, and is excellent in adhesiveness and optical characteristics.
- the pressure-sensitive adhesive composition of the present invention contains (A) (meth) acrylic resin, (B) dispersant, and (C) metal oxide particles.
- the (meth) acrylic resin is a monomer component containing a (meth) acrylic acid alkyl ester (monomer) (hereinafter referred to as a monomer component that is a raw material for the (A) (meth) acrylic resin, and a first monomer component). Can be obtained by polymerization.
- (meth) acryl means acryl and / or methacryl.
- (meth) acrylic acid alkyl esters examples include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, and isobutyl (meth).
- (meth) acrylate monomers of a cyclic or cyclic alkyl These alkyl (meth) acrylates can be used alone or in combination of two or more.
- Preferred examples of the (meth) acrylic acid alkyl ester include n-butyl (meth) acrylate and 2-ethylhexyl (meth) acrylate.
- the first monomer component can include a copolymerizable monomer copolymerizable with (meth) acrylic acid alkyl ester (hereinafter, referred to as a first copolymerizable monomer).
- Examples of the first copolymerizable monomer include a nitrogen-containing monomer, a hydroxyl group-containing monomer, and an acidic group-containing monomer.
- nitrogen-containing monomer examples include N-vinylpyrrolidone, N-vinylcaprolactam, (meth) acryloylmorpholine, N, N-dimethyl (meth) acrylamide and the like.
- nitrogen-containing monomer examples include N-vinylpyrrolidone, N-vinylcaprolactam, (meth) acryloylmorpholine, N, N-dimethyl (meth) acrylamide and the like.
- tertiary amino group containing monomer mentioned later, the quaternary ammonium group containing monomer mentioned later, etc. are mentioned.
- These nitrogen-containing monomers can be used alone or in combination of two or more.
- Preferred nitrogen-containing monomers include (meth) acryloylmorpholine and N, N-dimethyl (meth) acrylamide.
- the content ratio is, for example, 0.5% by mass or more, preferably 1% by mass or more with respect to the total amount of the first monomer component, from the viewpoint of improving adhesiveness.
- it is 30 mass% or less, Preferably, it is 15 mass% or less.
- hydroxyl group-containing monomer examples include 2-hydroxyethyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, caprolactone modified (meth) acrylate, and polyethylene glycol acrylate. These hydroxyl group-containing monomers can be used alone or in combination of two or more. Preferred examples of the hydroxyl group-containing monomer include 2-hydroxyethyl (meth) acrylate.
- the content ratio is, for example, 0.1% by mass or more, for example, 5% by mass or less, with respect to the total amount of the first monomer component, from the viewpoint of improving adhesiveness. Preferably, it is 2 mass% or less.
- the acid group-containing monomer examples include carboxyl group-containing monomers such as acrylic acid, methacrylic acid, itaconic acid, maleic acid, fumaric acid, crotonic acid, ethylene oxide-modified succinic acid acrylate, and further, for example, 2-acrylamide-2- Examples thereof include sulfonic acid group-containing monomers such as methylpropane sulfonic acid. These acidic group-containing monomers can be used alone or in combination of two or more.
- the acidic group-containing monomer is preferably a carboxyl group-containing monomer, more preferably acrylic acid.
- the content ratio is, for example, 0.1% by mass or more, preferably 0.5% by mass with respect to the total amount of the first monomer component from the viewpoint of improving the adhesiveness. For example, it is 20% by mass or less, preferably 10% by mass or less.
- alkane polyol poly (meth) acrylate may be further mentioned.
- alkane polyol poly (meth) acrylate examples include neopentyl glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, propylene glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, And (meth) acrylic acid esters of polyhydric alcohols such as tetramethylol methane tri (meth) acrylate and dipentaerythritol hexa (meth) acrylate.
- alkane polyol poly (meth) acrylates can be used alone or in combination of two or more.
- the alkane polyol poly (meth) acrylate is preferably 1,6-hexanediol di (meth) acrylate.
- the content ratio is, for example, 0.01% by mass or more with respect to the total amount of the first monomer component from the viewpoint of improving the adhesiveness. % By mass or less, preferably 1% by mass or less.
- examples of the first copolymerizable monomer also include a saturated alicyclic group-containing monomer having a saturated alicyclic group composed of two or more rings.
- saturated alicyclic group-containing monomer containing a saturated alicyclic group composed of two or more rings examples include a (meth) acrylate containing a bicyclo group, a (meth) acrylate containing a tricyclo group, and a tetracyclo group.
- (Meth) acrylate etc. are mentioned, Preferably, the (meth) acrylate containing a bicyclo group and the (meth) acrylate containing a tricyclo group are mentioned.
- Examples of the (meth) acrylate containing a bicyclo group include bornyl (meth) acrylate, isobornyl (meth) acrylate, dicyclopentanyl (meth) acrylate, and the like. These (meth) acrylates containing a bicyclo group can be used alone or in combination of two or more.
- Examples of the (meth) acrylate containing a tricyclo group include adamantyl (meth) acrylate and dimethyladamantyl (meth) acrylate. These (meth) acrylates containing a tricyclo group can be used alone or in combination of two or more.
- saturated alicyclic group-containing monomers having a saturated alicyclic group composed of two or more rings can be used alone or in combination of two or more.
- examples of the first copolymerizable monomer include aromatic vinyl monomers such as styrene, vinyltoluene, and ⁇ -methylstyrene, vinyl cyanide monomers such as (meth) acrylonitrile, and itacon such as benzyl itaconate.
- aromatic vinyl monomers such as styrene, vinyltoluene, and ⁇ -methylstyrene
- vinyl cyanide monomers such as (meth) acrylonitrile
- itacon such as benzyl itaconate.
- acid esters include acid esters, maleic acid esters such as dimethyl maleate, fumaric acid esters such as dimethyl fumarate, acrylonitrile, methacrylonitrile, vinyl acetate, and the like, and preferably vinyl acetate.
- These first copolymerizable monomers can be used alone or in combination of two or more.
- the first monomer component contains a first copolymerizable monomer.
- the content ratio of the (meth) acrylic acid alkyl ester is, for example, 60% by mass or more, preferably 70% with respect to the total amount of the first monomer component. For example, 98% by mass or less, preferably 95% by mass or less.
- the content ratio of the first copolymerizable monomer is, for example, 2% by mass or more, preferably 5% by mass or more, for example, 40% by mass or less, preferably, with respect to the total amount of the first monomer component. 30% by mass or less.
- the type of monomer selected as the first monomer component preferably overlaps at least partially with the type of monomer selected as the second monomer component described later.
- the (meth) acrylic resin is polymerized in the presence of a polymerization initiator by a known polymerization method such as solution polymerization, cage polymerization, suspension polymerization (when the first copolymerizable monomer is used). Can be obtained by copolymerization).
- a polymerization initiator such as solution polymerization, cage polymerization, suspension polymerization (when the first copolymerizable monomer is used). Can be obtained by copolymerization).
- the polymerization initiator is not particularly limited and is appropriately selected depending on the purpose and application. Specific examples of the polymerization initiator include radical polymerization initiators.
- radical polymerization initiator examples include azo compounds, peroxide compounds, sulfides, sulfines, sulfinic acids, diazo compounds, redox compounds, and preferably azo compounds and peroxide compounds. Can be mentioned.
- azo compound examples include azobisisobutyronitrile, azobisdimethylvaleronitrile, azobiscyclohexanenitrile, 1,1′-azobis (1-acetoxy-1-phenylethane), 2,2′-azobis ( 2-methylbutyronitrile) (also known as dimethyl 2,2′-azobisisobutyrate), 4,4′-azobis-4-cyanovaleric acid, and the like.
- peroxide compounds examples include benzoyl peroxide, lauroyl peroxide, acetyl peroxide, capryel peroxide, 2,4-dichlorobenzoyl peroxide, isobutyl peroxide, acetylcyclohexylsulfonyl peroxide, and t-butyl peroxide.
- These polymerization initiators can be used alone or in combination of two or more.
- the blending ratio of the polymerization initiator is, for example, 0.1 parts by mass or more, preferably 0.5 parts by mass or more, for example, 13 parts by mass or less, preferably 100 parts by mass of the first monomer component. Is 10 parts by mass or less.
- the solvent is not particularly limited as long as it is stable with respect to the first monomer component described above.
- petroleum hydrocarbon solvents such as hexane and mineral spirits
- aromatic hydrocarbon solvents such as benzene, toluene and xylene
- ketone solvents such as acetone, methyl ethyl ketone, methyl isobutyl ketone, diisobutyl ketone and cyclohexanone, such as methyl acetate, ethyl acetate, butyl acetate, ⁇ - Ester solvents such as butyrolactone and propylene glycol monomethyl ether acetate
- organic solvents such as aprotic polar solvents such as N, N-dimethylformamide, N, N-dimethylacetamide, dimethyl sulfoxide, N-methylpyrrolidone and pyridine Raising It
- the solvent examples include water, for example, alcohol solvents such as methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol, and butyl alcohol, for example, glycol ethers such as ethylene glycol monoethyl ether and propylene glycol monomethyl ether.
- alcohol solvents such as methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol
- butyl alcohol for example, glycol ethers such as ethylene glycol monoethyl ether and propylene glycol monomethyl ether.
- An aqueous solvent such as a solvent may also be mentioned.
- the solvent is also available as a commercial product.
- examples of petroleum hydrocarbon solvents include AF Solvent Nos. 4 to 7 (above, Shin Nippon Oil Co., Ltd.), and aromatics.
- examples of the hydrocarbon solvent include Ink Solvent No. 0 manufactured by Nippon Oil Corporation, Solvesso 100, 150, and 200 manufactured by Exxon Chemical.
- solvents can be used alone or in combination of two or more.
- the mixing ratio of the solvent is not particularly limited, and is appropriately set according to the purpose and use.
- the polymerization temperature is, for example, 30 ° C. or higher, preferably 60 ° C. or higher, for example, 150 ° C. or lower.
- the temperature is preferably 120 ° C. or lower.
- the polymerization time is, for example, 2 hours or more, preferably 4 hours or more, for example, 20 hours or less, preferably 8 hours or less.
- the first monomer component may be mixed at once or dividedly mixed.
- the weight average molecular weight (polystyrene conversion) of the (A) (meth) acrylic resin thus obtained is, for example, 200,000 or more, preferably 250,000 or more, for example, 500,000 or less, preferably 450,000 or less. is there.
- the number average molecular weight (polystyrene conversion) of the (A) (meth) acrylic resin is, for example, 10,000 or more, preferably 12,000 or more, for example, 50,000 or less, preferably 30,000 or less. is there.
- the measuring method of a weight average molecular weight and a number average molecular weight is based on the Example mentioned later.
- the glass transition temperature of the (A) (meth) acrylic resin is, for example, ⁇ 55 ° C. or higher, preferably ⁇ 40 ° C. or higher, for example, 20 ° C. or lower, preferably 10 ° C., from the viewpoint of adhesiveness. It is as follows.
- the glass transition temperature can be calculated by Fox's formula.
- the content ratio of (A) (meth) acrylic resin is, for example, 15% by mass or more, preferably 20% by mass or more, for example, 90% by mass or less, preferably, relative to the total amount of the pressure-sensitive adhesive composition. 80% by mass or less.
- the dispersant is made of a (meth) acrylic resin having an ionic group.
- the ionic group examples include an anionic group such as a carboxyl group and a phosphoric acid group, and a cationic group such as a tertiary amino group and a quaternary ammonium group.
- the tertiary amino group is not particularly limited.
- the tertiary amino group is included in the ionic group because it is protonated.
- Examples of the quaternary ammonium group include those obtained by allowing a quaternizing agent such as epihalohydrin, benzyl halide, or alkyl halide to act on the tertiary amino group.
- a quaternizing agent such as epihalohydrin, benzyl halide, or alkyl halide
- These ionic groups may be one kind or two or more kinds may be used in combination.
- the ionic group is preferably selected according to the type of (C) metal oxide particles described later.
- the ionic group is preferably a phosphate group.
- the dispersibility of the (C) metal oxide particles can be further improved, and the optical characteristics can be further improved.
- the ionic group is preferably a tertiary amino group.
- the dispersibility of the (C) metal oxide particles can be further improved, and the optical characteristics can be further improved.
- Such a (meth) acrylic resin having an ionic group includes, for example, a monomer component containing an ionic group-containing monomer (hereinafter referred to as a monomer component that is a raw material for a (meth) acrylic resin having an ionic group). It can be obtained by polymerization of component).
- a monomer component containing an ionic group-containing monomer hereinafter referred to as a monomer component that is a raw material for a (meth) acrylic resin having an ionic group. It can be obtained by polymerization of component).
- Examples of the ionic group-containing monomer include a carboxyl group-containing monomer, a phosphate group-containing monomer, a tertiary amino group-containing monomer, and a quaternary ammonium group-containing monomer.
- carboxyl group-containing monomer examples include ⁇ , ⁇ -unsaturated carboxylic acids such as (meth) acrylic acid, itaconic acid, maleic acid and fumaric acid or salts thereof such as hydroxyalkyl (meth) acrylate and acid anhydrides described above. And a half esterified product, preferably ⁇ , ⁇ -unsaturated carboxylic acid, more preferably (meth) acrylic acid.
- carboxyl group-containing monomer examples include ⁇ , ⁇ -unsaturated carboxylic acids such as (meth) acrylic acid, itaconic acid, maleic acid and fumaric acid or salts thereof such as hydroxyalkyl (meth) acrylate and acid anhydrides described above.
- a half esterified product preferably ⁇ , ⁇ -unsaturated carboxylic acid, more preferably (meth) acrylic acid.
- Examples of phosphoric acid group-containing monomers include phosphoric acid group-containing (meth) acrylates such as acid phosphooxyethyl (meth) acrylate, acid phosphooxypolyoxypropylene glycol monomethacrylate, and mono (2-hydroxyethyl (meth) acrylate) phosphate. ) Acrylate, and preferably mono (2-hydroxyethyl (meth) acrylate) phosphate.
- tertiary amino group-containing monomer examples include N, N-dimethylaminoethyl (meth) acrylate (also known as 2-dimethylaminoethyl (meth) acrylate), N, N-diethylaminoethyl (meth) acrylate, and N, N.
- N, N-dialkylaminoalkyl (meth) acrylates such as dimethylaminopropyl (meth) acrylate, N, N-di-t-butylaminoethyl (meth) acrylate, N, N-dimethylaminobutyl (meth) acrylate
- N, N-dialkylaminoalkyl (meth) acrylamide such as N, N-dimethylaminoethyl (meth) acrylamide, N, N-diethylaminoethyl (meth) acrylamide, N, N-dimethylaminopropyl (meth) acrylamide, etc.
- N- dialkylaminoalkyl (meth) acrylate and more preferably include, N, N- dimethylaminoethyl (meth) acrylate.
- the quaternary ammonium group-containing monomer is, for example, a quaternizing agent (for example, epihalohydrin, benzyl halide, alkyl halide, etc.) acting on the above-mentioned tertiary amino group-containing monomer.
- a quaternizing agent for example, epihalohydrin, benzyl halide, alkyl halide, etc.
- (meth) acryloyloxyalkyltrialkylammonium salts such as 2- (methacryloyloxy) ethyltrimethylammonium chloride, 2- (methacryloyloxy) ethyltrimethylammonium bromide, 2- (methacryloyloxy) ethyltrimethylammonium dimethyl phosphate, (Meth) acryloylaminoalkyltrialkylamines such as methacryloylaminopropyltrimethylammonium chloride and methacryloylaminopropyltrimethylammonium bromide
- the metal salt include tetraalkyl (meth) acrylates such as tetrabutylammonium (meth) acrylate, and trialkylbenzylammonium (meth) acrylates such as trimethylbenzylammonium (meth) acrylate.
- Acryloyloxyalkyltrialkylammonium salt such as 2-
- ionic group-containing monomers can be used alone or in combination of two or more.
- the ionic group-containing monomer is preferably selected according to the type of (C) metal oxide particles described later.
- the metal oxide particles (C) described later are zirconium oxide and / or titanium oxide
- the ionic group-containing monomer is preferably a phosphate group-containing monomer.
- the dispersibility of the (C) metal oxide particles can be further improved, and the optical characteristics can be further improved.
- the ionic group-containing monomer is preferably a tertiary amino group-containing monomer.
- the dispersibility of the (C) metal oxide particles can be further improved, and the optical characteristics can be further improved.
- the second monomer component can further contain a copolymerizable monomer copolymerizable with the ionic group-containing monomer (hereinafter referred to as the second copolymerizable monomer).
- Examples of the second copolymerizable monomer include the above-described (meth) acrylic acid alkyl ester, the above-described nitrogen-containing monomer (excluding the tertiary amino group-containing monomer and the quaternary ammonium group-containing monomer), and the above-described hydroxyl group-containing monomer.
- the above-mentioned alkane polyol poly (meth) acrylate, the above-mentioned saturated alicyclic group-containing monomer, the above-described aromatic vinyl monomer, and the above-mentioned itaconic acid ester, maleic acid ester, fumarate ester, acrylonitrile, methacrylonitrile, acetic acid Vinyl etc. are mentioned.
- These second copolymerizable monomers can be used alone or in combination of two or more.
- (meth) acrylic acid alkyl ester is preferably used as the second copolymerizable monomer.
- the content ratio of the (meth) acrylic acid alkyl ester is, for example, 20% by mass or more, preferably 40%, based on the total amount of the second monomer component. It is 60 mass% or more, for example, Preferably it is 98 mass% or less, Preferably, it is 95 mass% or less.
- the second copolymerizable monomer preferably contains another copolymerizable monomer (second copolymerizable monomer excluding (meth) acrylic acid alkyl ester).
- the total content is based on the total amount of the second monomer component. For example, 1% by mass or more, preferably 2% by mass or more, more preferably 5% by mass or more, for example, 40% by mass or less, preferably 30% by mass or less.
- the content ratio of the ionic group-containing monomer is, for example, 0.1% by mass or more, preferably 1% by mass or more, for example, 80% by mass with respect to the total amount of the second monomer component. It is 70 mass% or less, More preferably, it is 60 mass% or less.
- the monomer contained in the second monomer component is preferably selected so as to at least partially overlap the type of monomer contained in the first monomer component described above.
- the second monomer component contains the same (meth) acrylic acid alkyl ester as the (meth) acrylic acid alkyl ester contained in the first monomer component.
- the second monomer component contains a monomer of the same type as the first copolymerizable monomer contained in the first monomer component.
- the dispersibility can be improved.
- the (meth) acrylic resin having an ionic group can be obtained by copolymerization in the presence of a polymerization initiator by a known polymerization method such as solution polymerization, cage polymerization or suspension polymerization.
- the polymerization initiator is not particularly limited, and examples thereof include the same polymerization initiator as the polymerization initiator used in the synthesis of the (A) (meth) acrylic resin described above.
- the blending ratio of the polymerization initiator is, for example, 0.1 parts by mass or more, preferably 2 parts by mass or more, for example, 13 parts by mass or less, preferably with respect to 100 parts by mass of the second monomer component. It is 10 parts by mass or less.
- the solvent is not particularly limited as long as it is stable with respect to the second monomer component described above, and in the synthesis of the (A) (meth) acrylic resin described above.
- the solvent similar to the solvent used is mentioned.
- the mixing ratio of the solvent is not particularly limited, and is appropriately set according to the purpose and use.
- the polymerization conditions of the second monomer component vary depending on the types of the second monomer component, polymerization initiator, solvent, etc., but the polymerization temperature is, for example, 30 ° C. or higher, preferably 60 ° C. or higher, for example, 150 ° C. or lower. The temperature is preferably 120 ° C. or lower.
- the polymerization time is, for example, 2 hours or more, preferably 4 hours or more, for example, 20 hours or less, preferably 8 hours or less.
- the second monomer component may be blended in a lump or may be divided and blended.
- the weight average molecular weight (polystyrene conversion) of the (meth) acrylic resin having an ionic group obtained by this is 200 or more, preferably 1000 or more, more preferably 4000 or more, and 50000 or less, 15000 or less, more preferably 8000 or less.
- the weight average molecular weight of the (meth) acrylic resin having an ionic group is in the above range, excellent dispersibility can be obtained.
- the number average molecular weight (polystyrene conversion) of the (meth) acrylic resin having an ionic group is, for example, 100 or more, preferably 650 or more, for example, 33,000 or less, preferably 10,000 or less.
- the number average molecular weight of the (meth) acrylic resin having an ionic group is within the above range, excellent adhesiveness can be obtained.
- the measuring method of a weight average molecular weight and a number average molecular weight is based on the Example mentioned later.
- the content rate of a dispersing agent is 2 mass% or more with respect to the total amount (solid content) of an adhesive composition, Preferably, it is 5 mass% or more, for example, 30 mass% or less, Preferably 20 mass% or less.
- the content rate of (B) dispersing agent is 5 mass parts or more with respect to 100 mass parts of (A) (meth) acrylic resin, Preferably, it is 8 mass parts or more, for example, 50 mass parts or less. The amount is preferably 30 parts by mass or less.
- the metal oxide particles include metal oxides such as aluminum oxide, titanium oxide, zinc oxide, zirconium oxide, tin oxide, yttrium oxide, bismuth oxide, antimony oxide, cerium oxide, indium oxide, and niobium pentoxide.
- metal oxides such as aluminum oxide, titanium oxide, zinc oxide, zirconium oxide, tin oxide, yttrium oxide, bismuth oxide, antimony oxide, cerium oxide, indium oxide, and niobium pentoxide.
- foreign metal doped metal oxides obtained by doping different metal elements such as gallium, antimony, tin, fluorine, phosphorus, and aluminum (for example, antimony-doped tin oxide)
- composite oxides such as titanic acid compounds (barium titanate, calcium titanate, strontium titanate, etc.).
- the crystal structure of the metal oxide is not particularly limited, and may be any of, for example, cubic, tetragonal, orthorhombic, monoclinic, triclinic
- These (C) metal oxide particles can be used alone or in combination of two or more.
- the metal oxide particles can be appropriately selected according to the physical properties required for the adhesive composition.
- titanium oxide and zirconium oxide are mentioned from the viewpoint of improving the refractive index
- antimony-doped tin oxide is mentioned from the viewpoint of improving the heat shielding effect.
- the metal oxide particles may be subjected to a surface treatment by a known method if necessary.
- These (C) metal oxide particles can be used alone or in combination of two or more.
- the shape of the metal oxide particles is not particularly limited, and examples thereof include a lump shape, a spherical shape, a hollow shape, a porous shape, a rod shape, a plate shape, a fiber shape, an indefinite shape, and a mixture thereof.
- the particle diameter of the metal oxide particles is measured as a primary particle diameter (distinguishable from an average particle diameter described later), and is, for example, 1 nm or more, preferably 3 nm or more, for example, 200 nm or less, preferably Is 90 nm or less.
- the primary particle diameter is calculated by measuring the particle diameter of 100 metal oxide particles using an electron microscope such as a scanning electron microscope (SEM) or a transmission electron microscope (TEM) and calculating an average value thereof. Can be obtained.
- SEM scanning electron microscope
- TEM transmission electron microscope
- the content ratio of the metal oxide particles is, for example, 2% by mass or more, preferably 5% by mass or more, more preferably 10% by mass or more with respect to the total amount of the pressure-sensitive adhesive composition. 80% by mass or less, preferably 50% by mass or less, and more preferably 40% by mass or less.
- the content rate of (C) metal oxide particle is 5 mass parts or more with respect to 100 mass parts of (A) (meth) acrylic resin, Preferably, it is 8 mass parts or more, for example, 80 masses. Part or less, preferably 70 parts by weight or less.
- the pressure-sensitive adhesive composition can be obtained by blending (A) (meth) acrylic resin, (B) dispersant, and (C) metal oxide particles in the above ratio and mixing them. it can.
- the mixing method is not particularly limited, and a known method such as wet mixing or dry mixing can be employed. Preferably, wet mixing is employed.
- the dispersion medium is not particularly limited, and a known dispersion medium can be used. Specifically, for example, in the synthesis of (A) (meth) acrylic resin and (B) dispersant.
- the solvent similar to a solvent is mentioned, Preferably, the above-mentioned organic solvent is mentioned.
- These dispersion media can be used alone or in combination of two or more.
- the solvent used in the preparation of (A) (meth) acrylic resin and / or (B) dispersant is used as it is as a dispersion medium.
- the mixing ratio of the dispersion medium is appropriately set according to the purpose and application.
- the mixing order is not particularly limited, and for example, (A) (meth) acrylic resin, (B) dispersant, and (C) metal oxide particles may be mixed together.
- (A) (meth) acrylic resin and (B) dispersant may be mixed, and then the obtained mixture and (C) metal oxide particles may be mixed.
- (A) (meth) acrylic resin and (C) metal oxide particles may be mixed, and then the obtained mixture and (B) dispersant may be mixed.
- the dispersant and (C) metal oxide particles may be mixed, and then the obtained mixture and (A) (meth) acrylic resin may be mixed.
- the particle size of the (C) metal oxide particles in the resulting dispersion is as follows: (C) Since the metal oxide particles exist as primary particles and secondary particles, the average particle size (average particle size) of these particles Measured and usually exceeds 0 nm, for example, 200 nm or less, preferably 90 nm or less, more preferably 20 nm or less.
- the measuring method of an average particle diameter is based on the Example mentioned later.
- the dispersion method is not particularly limited, and for example, a known disperser such as a paint shaker, a roll mill, a ball mill, an attritor, a sand mill, a bead mill, or an ultrasonic disperser can be used.
- a known disperser such as a paint shaker, a roll mill, a ball mill, an attritor, a sand mill, a bead mill, or an ultrasonic disperser can be used.
- dispersion media such as zirconia beads and glass beads can be used.
- the bead diameter of the dispersion medium is not particularly limited, but is, for example, 10 ⁇ m or more, for example, 500 ⁇ m or less, preferably 100 ⁇ m or less. Note that the filling rate of the dispersion medium is appropriately set according to the purpose and application.
- the metal oxide particles can be pulverized by the above-described dispersion medium, and the average particle diameter can be adjusted to the above range. In such a case, metal oxide particles having an average particle diameter larger than the above range can be introduced into the disperser.
- a dispersion of the pressure-sensitive adhesive composition is obtained by mixing the dispersion of metal oxide particles obtained above and (A) (meth) acrylic resin.
- the concentration of the non-volatile content is, for example, 10% by mass or more, preferably 20% by mass or more, for example, 50% by mass or less, preferably 40% by mass or less. It is.
- the glass transition temperature of the nonvolatile content (solid content) of the pressure-sensitive adhesive composition is, for example, ⁇ 55 ° C. or higher, preferably ⁇ 40 ° C. or higher, for example, 20 ° C. or lower, preferably from the viewpoint of adhesiveness. It is 10 degrees C or less.
- the glass transition temperature can be calculated by Fox's formula.
- the pressure-sensitive adhesive composition can be used as it is, but preferably a curing agent is added.
- the curing agent examples include a crosslinking agent that crosslinks (A) (meth) acrylic resin, and specifically, for example, a polyisocyanate compound.
- the polyisocyanate compound is a compound having two or more isocyanate groups in the molecule and is not particularly limited.
- a known polyisocyanate compound such as tolylene diisocyanate or a hydrogenated product thereof, triphenylmethane triisocyanate, hexamethylene diisocyanate, and the like.
- Isocyanates examples include derivatives of the above polyisocyanates (for example, polyhydric alcohol adducts) and polymers.
- polyisocyanate compounds can be used alone or in combination of two or more.
- the blending ratio of the curing agent is, for example, 0.1 parts by mass or more, preferably 0.3 parts by mass or more, for example, 2 parts by mass or less, preferably 1 part with respect to 100 parts by mass of the pressure-sensitive adhesive composition. It is below mass parts.
- curing agent is 0.5 mass part or more with respect to 100 mass parts of (A) (meth) acrylic resin in an adhesive composition, Preferably, it is 1 mass part or more, for example, 10 parts by mass or less, preferably 5 parts by mass or less.
- the adhesiveness of the pressure-sensitive adhesive composition can be improved.
- an adhesive composition contains (A) (meth) acrylic resin, (B) dispersing agent, and (C) metal oxide particle, (B) In an dispersing agent, an ionic group
- the (meth) acrylic resin having a weight average molecular weight of 200 or more and 50000 or less allows (C) the metal oxide particles to be well dispersed and provides excellent adhesiveness and optical properties. it can.
- the pressure-sensitive adhesive composition is suitably used, for example, as a pressure-sensitive adhesive composition for optical devices such as various display devices and touch panel devices.
- the pressure-sensitive adhesive composition may be used as it is, or may be formed into a layer shape or a sheet shape and used as a pressure-sensitive adhesive sheet.
- the present invention includes an adhesive sheet formed by layering the above-mentioned adhesive composition.
- the coating method is not particularly limited.
- roll coating, bar coating, doctor blade, Mayer bar, air knife, and the like which are generally used for coating, for example, screen printing, offset, etc.
- Known coating methods such as printing, flexographic printing, brush coating, spray coating, gravure coating, and reverse gravure coating are employed.
- the drying temperature is, for example, 40 ° C. or more, preferably 60 ° C. or more, for example, 180 ° C. or less, preferably 140 ° C. or less
- the drying time is, for example, 1 minute or more, preferably Is 3 minutes or more, for example, 60 minutes or less, preferably 30 minutes or less.
- the film thickness after drying is, for example, 50 nm or more, preferably 500 nm or more, for example, 30 ⁇ m or less, preferably 20 ⁇ m or less.
- the substrate may be removed if necessary, and a known release substrate may be laminated on the layer made of the pressure-sensitive adhesive composition.
- the adhesive sheet can be cured.
- the temperature condition is, for example, 10 ° C. or higher, preferably 20 ° C. or higher, for example, 50 ° C. or lower, preferably 40 ° C. or lower.
- the curing time is, for example, 12 hours or more, preferably 24 hours or more, for example, 170 hours or less, preferably 120 hours or less.
- the adhesive sheet obtained in this way is obtained using said adhesive composition, it is excellent in the dispersibility of a metal oxide particle, and adhesiveness and an optical characteristic (haze, total light transmittance) Excellent.
- the pressure-sensitive adhesive sheet is suitably used as a pressure-sensitive adhesive sheet for optical devices such as various display devices and touch panel devices.
- the weight average molecular weight (Mw) and the number average molecular weight (Mn) of the sample were calculated from the obtained chromatogram (chart) using standard polystyrene as a calibration curve.
- the measurement apparatus and measurement conditions are shown below.
- Preparation Example 2 (Preparation of dispersant (B2)) As the second monomer component, 46.5 parts of n-butyl acrylate, 46.5 parts of 2-ethylhexyl acrylate, and acid phosphooxypolyoxypropylene glycol monomethacrylate (ionic group-containing monomer, manufactured by Unichemical Co., Ltd., product) A dispersant (B2) having a weight average molecular weight of 6000 and a non-volatile content of 50% by mass was obtained in the same manner as in Preparation Example 1, except that 7.0 parts of name Phosmer PP) was used.
- dispersant (B2) having a weight average molecular weight of 6000 and a non-volatile content of 50% by mass was obtained in the same manner as in Preparation Example 1, except that 7.0 parts of name Phosmer PP) was used.
- Preparation Example 3 (Preparation of dispersant (B3)) Into a flask equipped with a stirrer, a condenser, a thermometer, an inert gas introduction tube and a dropping funnel, 100.0 parts of propylene glycol monomethyl ether acetate (PMA) is introduced, and an inert gas (nitrogen gas) is introduced to reach 90 ° C. The temperature rose.
- PMA propylene glycol monomethyl ether acetate
- nitrogen gas nitrogen gas
- Preparation Example 6 (Preparation of dispersant (B6)) Into a flask equipped with a stirrer, a condenser, a thermometer, an inert gas introduction tube and a dropping funnel, 100.0 parts of propylene glycol monomethyl ether was introduced, an inert gas (nitrogen gas) was introduced, and the temperature was raised to 110 ° C.
- Preparation Example 7 (Preparation of dispersant (B7)) Into a flask equipped with a stirrer, a condenser, a thermometer, an inert gas introduction tube and a dropping funnel, 100.0 parts of propylene glycol monomethyl ether was introduced, an inert gas (nitrogen gas) was introduced, and the temperature was raised to 115 ° C.
- Preparation Example 8 (Preparation of dispersant (B8)) 300.0 parts of propylene glycol monomethyl ether was introduced into a flask equipped with a stirrer, a condenser, a thermometer, an inert gas introduction tube, and a dropping funnel, an inert gas (nitrogen gas) was introduced, and the temperature was raised to 115 ° C.
- Agent (B8) was obtained.
- Preparation Example 9 (Preparation of dispersant (B9)) Preparation Example, except that 62.0 parts of n-butyl acrylate, 31.0 parts of 2-ethylhexyl acrylate, and 7.0 parts of 2-dimethylaminoethyl acrylate (ionic group-containing monomer) were used as the second monomer component
- a dispersant (B9) having a weight average molecular weight of 6000 and a nonvolatile content of 50% by mass was obtained.
- Preparation Example 10 (Preparation of dispersant (B10) The same as Preparation Example 1, except that 62.0 parts of n-butyl acrylate, 31.0 parts of 2-ethylhexyl acrylate, and 7.0 parts of methacrylic acid (ionic group-containing monomer) were used as the second monomer component.
- a dispersant (B10) having a weight average molecular weight of 6000 and a nonvolatile content of 50% by mass was obtained.
- the second monomer component 26.4 parts of n-butyl acrylate, 1.14 parts of isobornyl methacrylate, 16.3 parts of methyl methacrylate, 16.2 parts of 2-dimethylaminoethyl methacrylate (ionic group-containing monomer), polymerization
- a mixture comprising 0.2 part of 2,2′-azobis (2-methylbutyronitrile) (Nihon Finechem Co., Ltd., trade name: ABN-E) as an initiator was added dropwise over 3 hours.
- the temperature was raised to 100 ° C., 40.0 parts of propylene glycol monomethyl ether, 17.6 parts of n-butyl acrylate, 0.76 parts of isobornyl methacrylate, 10.8 parts of methyl methacrylate, 2-dimethylaminoethyl methacrylate (Ionic group-containing monomer) 10.8 parts, 2,2'-azobis (2-methylbutyronitrile) (Nippon Finechem Co., Ltd., trade name: ABN-E) as a polymerization initiator over 3 hours It was dripped.
- Preparation Example 12 (Preparation of dispersant (B12)) Into a flask equipped with a stirrer, a condenser, a thermometer, an inert gas introduction tube and a dropping funnel, 40.0 parts of propylene glycol monomethyl ether was introduced, an inert gas (nitrogen gas) was introduced, and the temperature was raised to 75 ° C.
- the second monomer component 16.0 parts of n-butyl acrylate, 0.76 parts of isobornyl methacrylate, 10.2 parts of methyl methacrylate, 13.0 parts of 2-dimethylaminoethyl methacrylate (ionic group-containing monomer), polymerization
- a mixture consisting of 0.1 part of 2,2′-azobis (2-methylbutyronitrile) (Nihon Finechem Co., Ltd., trade name: ABN-E) as an initiator was added dropwise over 3 hours.
- the temperature was raised to 100 ° C., 60.0 parts of propylene glycol monomethyl ether, 24.0 parts of n-butyl acrylate, 1.14 parts of isobornyl methacrylate, 15.4 parts of methyl methacrylate, 2-dimethylaminoethyl methacrylate (Ionic group-containing monomer) 19.5 parts, 2,2′-azobis (2-methylbutyronitrile) (Nippon Finechem Co., Ltd., trade name: ABN-E) as a polymerization initiator over 3 hours It was dripped.
- a dispersant (B13) having a weight average molecular weight of 30000 and a nonvolatile content of 50% by mass was obtained.
- a dispersant (B15) having a weight average molecular weight of 13,000 and a nonvolatile content of 50% by mass was obtained.
- Preparation Example 15 (Preparation of dispersant (B15)) Except for using 10.0 parts of 1,1,3,3 tetramethylbutylperoxy 2-ethylhexanoate (NOF Corporation, trade name Perocta O) as a polymerization initiator, A dispersant (B15) having a weight average molecular weight of 800 and a nonvolatile content of 50% by mass was obtained.
- NOF Corporation trade name Perocta O
- Preparation Example 16 (Preparation of dispersant (B16)) Into a flask equipped with a stirrer, condenser, thermometer, inert gas introduction tube and dropping funnel, 100.0 parts of propylene glycol monomethyl ether (PM) is introduced, inert gas (nitrogen gas) is introduced, and the temperature is raised to 110 ° C. Warm up.
- PM propylene glycol monomethyl ether
- nitrogen gas nitrogen gas
- the second monomer component 20.0 parts of n-butyl acrylate, 1.90 parts of isobornyl methacrylate, 18.1 parts of methyl methacrylate, acid phosphooxypolyoxypropylene glycol monomethacrylate (ionic group-containing monomer, Uni Co., Ltd.) 60.0 parts by Chemical, trade name: Phosmer PP, 5.0 parts of 2,2′-azobis (2-methylbutyronitrile) (Nippon Finechem, trade name: ABN-E) as polymerization initiator, polymerization Except for using 5.0 parts of 1,1,3,3 tetramethylbutylperoxy 2-ethylhexanoate (NOF Corporation, trade name: Perocta O) as an initiator, the same as in Preparation Example 3, A dispersant (B16) having a weight average molecular weight of 6000 and a nonvolatile content of 50% by mass was obtained.
- Phosmer PP 5.0 parts of 2,2′-azobis (2-methylbutyronit
- Preparation Example 17 (Preparation of dispersant (B17)) Into a flask equipped with a stirrer, condenser, thermometer, inert gas introduction tube and dropping funnel, 150.0 parts of propylene glycol monomethyl ether (PM) is introduced, inert gas (nitrogen gas) is introduced, and the temperature is raised to 110 ° C. Warm up.
- PM propylene glycol monomethyl ether
- nitrogen gas nitrogen gas
- the second monomer component 20.0 parts of n-butyl acrylate, 1.90 parts of isobornyl methacrylate, 18.1 parts of methyl methacrylate, 60.0 parts of methacrylic acid, 1,1,3,3 tetramethyl as a polymerization initiator
- Agent (B17) was obtained.
- Preparation Example 18 (Preparation of dispersant (B18)) Preparation Example, except that 46.5 parts of n-butyl acrylate, 46.5 parts of 2-ethylhexyl acrylate, and 7.0 parts of 2-dimethylaminoethyl acrylate (ionic group-containing monomer) were used as the second monomer component
- a dispersant (B18) having a weight average molecular weight of 6000 and a nonvolatile content of 50% by mass was obtained.
- Preparation Example 19 (Preparation of dispersant (B19)) The same as Preparation Example 2, except that 46.5 parts of n-butyl acrylate, 46.5 parts of 2-ethylhexyl acrylate, and 7.0 parts of methacrylic acid (ionic group-containing monomer) were used as the second monomer component.
- a dispersant (B19) having a weight average molecular weight of 6000 and a non-volatile content of 50% by mass was obtained.
- Preparation of mixture (dispersion) of (B) dispersant and (C) metal oxide particles Preparation Example 20 (Preparation of ZrO 2 dispersion) 18 parts of dispersant (B1) obtained in Preparation Example 1 (9 parts in terms of nonvolatile content), 10 parts of zirconium oxide (Ishihara Sangyo Co., Ltd., trade name PCS90) as metal oxide particles, and isopropyl alcohol 72 as a solvent 300 parts of 50 ⁇ m zirconia beads as a dispersion medium were placed in a 300 mL bottle, and the zirconium oxide was pulverized and dispersed at 60 Hz for 6 hours using a disperser (Rocking Shaker RS-05W manufactured by Seiwa Giken Co., Ltd.).
- a disperser Rocking Shaker RS-05W manufactured by Seiwa Giken Co., Ltd.
- zirconia beads were removed by filtration to obtain a dispersion in which zirconium oxide was dispersed (ZrO 2 dispersion).
- the non-volatile content in the obtained ZrO 2 dispersion was 19.0% by mass, and the average particle size of the metal oxide particles was 39 nm.
- the content rate of the dispersing agent (B1) was 9 mass%, and the content rate of the metal oxide particle (ZrO 2 ) was 10 mass%.
- Preparation Example 21 (Preparation of TiO 2 dispersion) Preparation Example 20 except that the dispersing agent (B2) obtained in Preparation Example 2 was used as the dispersing agent and titanium oxide (trade name: MT-05, manufactured by Teika Co., Ltd.) was used as the metal oxide particles. Similarly, a dispersion liquid (TiO 2 dispersion liquid) in which titanium oxide was dispersed was obtained.
- the nonvolatile content in the obtained TiO 2 dispersion was 19.0% by mass, and the average particle size of the metal oxide particles was 50 nm.
- the content ratio of the dispersing agent (B2) is a 9 wt%, the content of the metal oxide particles (TiO 2) was 10 weight%.
- Preparation Example 22 (Preparation of ATO dispersion) 12 parts (6 parts in terms of non-volatile content) of the dispersant (B3) obtained in Preparation Example 3 and antimony-doped tin (made by Ishihara Sangyo Co., Ltd., abbreviation: ATO, trade name SN-100P) as metal oxide particles 20 parts, 68 parts of isopropyl alcohol as a solvent and 300 parts of 100 ⁇ m zirconia beads as a dispersion medium are placed in a 300 mL bottle, and a metal oxide is used for 6 hours at 60 Hz using a disperser (Rocking Shaker RS-05W manufactured by Seiwa Giken Co., Ltd.). The particles were pulverized and dispersed. Thereafter, the zirconia beads were removed by filtration to obtain a dispersion liquid (ATO dispersion liquid) in which antimony-doped tin was dispersed.
- ATO dispersion liquid dispersion liquid
- the non-volatile content in the obtained ATO dispersion liquid was 26.0% by mass, and the average particle diameter of the metal oxide particles (ATO) was 34 nm.
- the content rate of the dispersing agent (B3) was 6 mass%, and the content rate of the metal oxide particle (ATO) was 20 mass%.
- the first monomer component 550.1 parts of n-butyl acrylate, 149.4 parts of 2-ethylhexyl acrylate, 72.0 parts of acrylic acid, 50.5 parts of vinyl acetate, 1,6-hexanediol diacrylate
- a mixture (1) consisting of 0.18 parts, 4.2 parts of 2-hydroxyethyl acrylate, 18.1 parts of N, N-dimethylacrylamide, and 13.5 parts of toluene as a solvent was added, and an inert gas was added. (Nitrogen gas) was introduced and the temperature was raised to 80 ° C.
- Preparation Example 24 (Preparation of (meth) acrylic resin (A2))
- the solvent of the mixture (1) is 512.7 parts of ethyl acetate and 492.6 parts of toluene, and the first monomer component is 568.0 parts of n-butyl acrylate, 166.0 parts of 2-ethylhexyl acrylate, 17 parts of acrylic acid.
- Preparation Example 25 (Preparation of (meth) acrylic resin (A3))
- the solvent of the mixture (1) is 456.5 parts of ethyl acetate and 438.6 parts of toluene
- the first monomer component is 544.4 parts of n-butyl acrylate, 146.9 parts of 2-ethylhexyl acrylate, 15 parts of acrylic acid. 8 parts, vinyl acetate 47.8 parts, 1,6-hexanediol diacrylate 0.17 parts, 2-hydroxyethyl acrylate 4.0 parts, and toluene as a solvent 13.45 parts.
- the solvent of the mixture (2) is 14.9 parts of toluene
- the first monomer component is 36.7 parts of 2-ethylhexyl acrylate
- the polymerization initiator is t-butylperoxy-
- a weight average molecular weight of 310,000 and a number average molecular weight were the same as in Preparation Example 23 except that the amount was changed to 1.45 parts of 2-ethyl hexanate. 21000, was obtained in a non-volatile content 39% by weight of (meth) acrylic resin (A3).
- the obtained pressure-sensitive adhesive composition was applied to a 25 ⁇ m polyethylene terephthalate film as a substrate: PET (trade name: Lumirror (trademark) T-60, manufactured by Toray Industries, Inc.) so that the film thickness after drying was 15 ⁇ m. Worked.
- the surface is covered with a 75 ⁇ m PET film (trade name: SPPET 7501BU, manufactured by Panac Co., Ltd.) and cured at 40 ° C. for 3 days. Obtained.
- Example 2 As a dispersion, 53 parts of the TiO 2 dispersion obtained in Preparation Example 21 (dispersant (B2) 4.77 parts, 5.3 parts of TiO 2 ) were used, and as a (meth) acrylic resin in Preparation Example 24.
- the pressure-sensitive adhesive composition, pressure-sensitive adhesive sheet 1 and pressure-sensitive adhesive sheet 2 were obtained in the same manner as in Example 1 except that 47 parts (18.8 parts in terms of nonvolatile content) of the obtained (meth) acrylic resin (A2) were used. Obtained.
- Example 3 As the dispersion, 53 parts of the ATO dispersion obtained in Preparation Example 22 (dispersant (B3) 3.18 parts, ATO 10.6 parts) was used, and as the (meth) acrylic resin, the dispersion was obtained in Preparation Example 25.
- a pressure-sensitive adhesive composition, pressure-sensitive adhesive sheet 1 and pressure-sensitive adhesive sheet 2 were obtained in the same manner as in Example 1, except that 47 parts (meth) acrylic resin (A3) (18.33 parts in terms of nonvolatile content) was used.
- Example 4 A ZrO 2 dispersion was obtained in the same manner as in Preparation Example 20, except that the dispersant (B4) obtained in Preparation Example 4 was blended so as to be 9 parts in terms of nonvolatile content.
- the non-volatile content in the obtained ZrO 2 dispersion was 19% by mass, and the average particle size of the metal oxide particles was 260 nm.
- the content ratio of the dispersing agent in the dispersion was 9 wt%, the content of the metal oxide particles (ZrO 2) was 10 weight%.
- Example 5 A ZrO 2 dispersion was obtained in the same manner as in Preparation Example 20, except that the dispersant (B5) obtained in Preparation Example 5 was blended so as to be 9 parts in terms of non-volatile content.
- the non-volatile content in the obtained ZrO 2 dispersion was 19% by mass, and the average particle size of the metal oxide particles was 190 nm.
- the content ratio of the dispersing agent in the dispersion was 9 wt%, the content of the metal oxide particles (ZrO 2) was 10 weight%.
- Example 6 A ZrO 2 dispersion was obtained in the same manner as in Preparation Example 20, except that the dispersant (B6) obtained in Preparation Example 6 was blended so as to be 9 parts in terms of nonvolatile content.
- the nonvolatile content in the obtained ZrO 2 dispersion was 19% by mass, and the average particle size of the metal oxide particles was 50 nm.
- the content ratio of the dispersing agent in the dispersion was 9 wt%, the content of the metal oxide particles (ZrO 2) was 10 weight%.
- Example 7 Using 53 parts of the ZrO 2 dispersion obtained in Preparation Example 20 (4.77 parts of dispersant (B1), 5.3 parts of ZrO 2 ), and obtained in Preparation Example 25 as a (meth) acrylic resin.
- a pressure-sensitive adhesive composition, pressure-sensitive adhesive sheet 1 and pressure-sensitive adhesive sheet 2 were obtained in the same manner as in Example 1 except that 47 parts (18.8 parts in terms of nonvolatile content) of (meth) acrylic resin (A3) was used.
- Example 8 As a dispersant, a ZrO 2 dispersion was obtained in the same manner as in Preparation Example 20, except that the dispersant (B7) obtained in Preparation Example 7 was blended so as to be 9 parts in terms of nonvolatile content.
- the nonvolatile content in the obtained ZrO 2 dispersion was 19% by mass, and the average particle size of the metal oxide particles was 50 nm.
- the content ratio of the dispersing agent in the dispersion was 9 wt%, the content of the metal oxide particles (ZrO 2) was 10 weight%.
- Example 9 A ZrO 2 dispersion was obtained in the same manner as in Preparation Example 20, except that the dispersant (B8) obtained in Preparation Example 8 was blended so as to be 9 parts in terms of nonvolatile content.
- the nonvolatile content in the obtained ZrO 2 dispersion was 19% by mass, and the average particle size of the metal oxide particles was 70 nm.
- the content ratio of the dispersing agent in the dispersion was 9 wt%, the content of the metal oxide particles (ZrO 2) was 10 weight%.
- Example 10 A ZrO 2 dispersion was obtained in the same manner as in Preparation Example 20, except that the dispersant (B9) obtained in Preparation Example 9 was blended so as to be 9 parts in terms of non-volatile content.
- the nonvolatile content in the obtained ZrO 2 dispersion was 19% by mass, and the average particle size of the metal oxide particles was 40 nm.
- the content ratio of the dispersing agent in the dispersion was 9 wt%, the content of the metal oxide particles (ZrO 2) was 10 weight%.
- Example 11 A ZrO 2 dispersion was obtained in the same manner as in Preparation Example 20, except that the dispersant (B10) obtained in Preparation Example 10 was blended so as to be 9 parts in terms of nonvolatile content.
- the nonvolatile content in the obtained ZrO 2 dispersion was 19% by mass, and the average particle size of the metal oxide particles was 40 nm.
- the content ratio of the dispersing agent in the dispersion was 9 wt%, the content of the metal oxide particles (ZrO 2) was 10 weight%.
- Example 12 As a dispersant, an ATO dispersion was obtained in the same manner as in Preparation Example 22, except that the dispersant (B11) obtained in Preparation Example 11 was blended so as to be 6 parts in terms of nonvolatile content.
- the nonvolatile content in the obtained ATO dispersion was 15% by mass, and the average particle diameter of the metal oxide particles (ATO) was 50 nm.
- the content rate of the dispersing agent in a dispersion liquid was 5 mass%, and the content rate of the metal oxide particle (ATO) was 10 mass%.
- a pressure-sensitive adhesive composition, pressure-sensitive adhesive sheet 1 and pressure-sensitive adhesive sheet 2 were obtained in the same manner as in Example 1 except that 46 parts of acrylic resin (A3) (18.4 parts in terms of nonvolatile content) was used.
- Example 13 As a dispersant, an ATO dispersion was obtained in the same manner as in Preparation Example 22, except that the dispersant (B12) obtained in Preparation Example 12 was blended so as to be 6 parts in terms of nonvolatile content.
- the nonvolatile content in the obtained ATO dispersion was 14% by mass, and the average particle diameter of the metal oxide particles (ATO) was 50 nm.
- the content rate of the dispersing agent in a dispersion liquid was 4 mass%, and the content rate of the metal oxide particle (ATO) was 10 mass%.
- a pressure-sensitive adhesive composition, pressure-sensitive adhesive sheet 1 and pressure-sensitive adhesive sheet 2 were obtained in the same manner as in Example 1 except that 46 parts of acrylic resin (A3) (18.4 parts in terms of nonvolatile content) was used.
- Example 14 As a dispersant, an ATO dispersion was obtained in the same manner as in Preparation Example 22, except that the dispersant (B13) obtained in Preparation Example 13 was blended so as to be 6 parts in terms of nonvolatile content.
- the nonvolatile content in the obtained ATO dispersion was 13% by mass, and the average particle diameter of the metal oxide particles (ATO) was 60 nm.
- the content rate of the dispersing agent in a dispersion liquid was 3 mass%, and the content rate of the metal oxide particle (ATO) was 10 mass%.
- Example 15 As a dispersant, an ATO dispersion was obtained in the same manner as in Preparation Example 22, except that the dispersant (B14) obtained in Preparation Example 14 was blended so as to be 6 parts in terms of nonvolatile content.
- the nonvolatile content in the obtained ATO dispersion was 13% by mass, and the average particle diameter of the metal oxide particles (ATO) was 50 nm.
- the content rate of the dispersing agent in a dispersion liquid was 3 mass%, and the content rate of the metal oxide particle (ATO) was 10 mass%.
- a pressure-sensitive adhesive composition, pressure-sensitive adhesive sheet 1 and pressure-sensitive adhesive sheet 2 were obtained in the same manner as in Example 1 except that 47 parts (18.33 parts in terms of nonvolatile content) of acrylic resin (A3) was used.
- Example 16 As a dispersant, an ATO dispersion was obtained in the same manner as in Preparation Example 22, except that the dispersant (B15) obtained in Preparation Example 15 was blended so as to be 6 parts in terms of nonvolatile content.
- the nonvolatile content in the obtained ATO dispersion was 13% by mass, and the average particle diameter of the metal oxide particles (ATO) was 50 nm.
- the content rate of the dispersing agent in a dispersion liquid was 3 mass%, and the content rate of the metal oxide particle (ATO) was 10 mass%.
- Example 17 As a dispersant, an ATO dispersion was obtained in the same manner as in Preparation Example 22, except that the dispersant (B16) obtained in Preparation Example 16 was blended so as to be 6 parts in terms of nonvolatile content.
- the nonvolatile content in the obtained ATO dispersion was 13% by mass, and the average particle diameter of the metal oxide particles (ATO) was 300 nm.
- the content rate of the dispersing agent in a dispersion liquid was 3 mass%, and the content rate of the metal oxide particle (ATO) was 10 mass%.
- a pressure-sensitive adhesive composition, pressure-sensitive adhesive sheet 1 and pressure-sensitive adhesive sheet 2 were obtained in the same manner as in Example 1 except that 47 parts (18.33 parts in terms of nonvolatile content) of acrylic resin (A3) was used.
- Example 18 As a dispersant, an ATO dispersion was obtained in the same manner as in Preparation Example 22, except that the dispersant (B17) obtained in Preparation Example 17 was blended so as to be 6 parts in terms of nonvolatile content.
- the nonvolatile content in the obtained ATO dispersion was 13% by mass, and the average particle diameter of the metal oxide particles (ATO) was 300 nm.
- the content rate of the dispersing agent in a dispersion liquid was 3 mass%, and the content rate of the metal oxide particle (ATO) was 10 mass%.
- ATO dispersion liquid obtained above (dispersant (B17) 3.18 parts, 10.6 parts of ATO) was used, and the (meth) acrylic resin obtained in Preparation Example 25 (meth)
- a pressure-sensitive adhesive composition, pressure-sensitive adhesive sheet 1 and pressure-sensitive adhesive sheet 2 were obtained in the same manner as in Example 1 except that 47 parts (18.33 parts in terms of nonvolatile content) of acrylic resin (A3) was used.
- Example 19 A TiO 2 dispersion liquid was obtained in the same manner as in Preparation Example 21, using the dispersant (B18) obtained in Preparation Example 18 as the dispersant.
- the nonvolatile content in the obtained TiO 2 dispersion was 19% by mass, and the average particle diameter of the metal oxide particles was 40 nm.
- the content ratio of the dispersing agent in the dispersion was 9 wt%, the content of the metal oxide particles (TiO 2) was 10 weight%.
- Example 20 A TiO 2 dispersion was obtained in the same manner as in Preparation Example 21, using the dispersant (B19) obtained in Preparation Example 19 as the dispersant.
- the nonvolatile content in the obtained TiO 2 dispersion was 19% by mass, and the average particle size of the metal oxide particles was 50 nm.
- the content ratio of the dispersing agent in the dispersion was 9 wt%, the content of the metal oxide particles (TiO 2) was 10 weight%.
- Comparative Example 1 As a dispersant, a commercially available dispersant (trade name Solsperse 56000, polyester resin-based dispersant, manufactured by Avicia, melting point 55 ° C., acid value 23 mgKOH / g) was blended so as to be 9 parts in terms of nonvolatile content, In the same manner as in Preparation Example 20, a ZrO 2 dispersion was obtained.
- a commercially available dispersant trade name Solsperse 56000, polyester resin-based dispersant, manufactured by Avicia, melting point 55 ° C., acid value 23 mgKOH / g
- the content ratio of the dispersing agent in the dispersion was 9 wt%, the content of the metal oxide particles (ZrO 2) was 10 weight%.
- the pressure-sensitive adhesive composition and the pressure-sensitive adhesive were obtained in the same manner as in Example 1 except that 53 parts of the ZrO 2 dispersion obtained above (4.77 parts of a commercially available dispersant, 5.3 parts of ZrO 2 ) were used. Sheet 1 and adhesive sheet 2 were obtained.
- the adhesive strength was evaluated using the adhesive sheet 1 by the method shown below. Moreover, the optical characteristic was evaluated using the adhesive sheet 2. Furthermore, dispersibility was evaluated using the pressure-sensitive adhesive composition (composition before molding of the pressure-sensitive adhesive sheet). The results are shown in Tables 1 and 2.
- (1) Adhesive strength of pressure-sensitive adhesive sheet The 75 ⁇ m peel-treated PET film of pressure-sensitive adhesive sheet 1 was peeled and measured in accordance with JIS Z 0237 (2009).
- the obtained adhesive sheet was cut into 25 mm ⁇ 100 mm, and tested by reciprocating twice using a 2 kg rubber roller in an atmosphere of 23 ° C. and 50% relative humidity on a stainless steel plate (SUS304BA plate). A piece was made.
- this test piece was left for 30 minutes in the same atmosphere, and then subjected to a 180 ° peel test at a peel rate of 0.3 m / min.
- the phosphate group-containing monomer refers to acid phosphooxypolyoxypropylene glycol monomethacrylate (ionic group-containing monomer, product name: Phosmer PP, manufactured by Unichemical Co., Ltd.).
- the pressure-sensitive adhesive composition using the dispersant which is a (meth) acrylic resin having an ionic group improves the haze of the pressure-sensitive adhesive composition compared to the case where the polyester resin-based dispersant is used. You can see that it is made. This is because the dispersant, which is an acrylic resin having an ionic group, is more compatible with the (A) (meth) acrylic resin than the polyester resin-based dispersant, and the metal oxide particles are more preferably used as a pressure-sensitive adhesive composition. It is inferred that it was able to be dispersed.
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Abstract
Description
レーザー光回折・散乱式粒度分布測定装置Nanotrac UPA-EX150(日機装社製)を用い、以下の条件により測定を行った。
測定回数:1回
測定時間:180秒
測定温度:23℃
平均粒子径:体積平均粒子径の累積50%の値
測定溶剤:分散液作製時に使用した分散媒
CI値:0.4~0.8
粒子形状:非球形
粒子透過性:透過
感度:スタンダード
フィルタ:Stand:Norm
ナノレンジ補正:無効
<ゲルパーミエーションクロマトグラフィーによる重量平均分子量(Mw)および数平均分子量(Mn)測定>
サンプルをテトラヒドロフランに溶解させ、試料濃度を1.0g/Lとして、示差屈折率検出器(RID)を装備したゲルパーミエーションクロマトグラフ(GPC)によって測定し、サンプルの分子量分布を得た。
データ処理装置:品番HLC-8220GPC(東ソー社製)
示差屈折率検出器:品番HLC-8220GPCに内蔵されたRI検出器
カラム:品番TSKgel SuperHZM-H(東ソー社製)2本
移動相:テトラヒドロフラン
カラム流量:0.35mL/min
試料濃度:1.0g/L
注入量:10μL
測定温度:40℃
分子量マーカー:標準ポリスチレン(POLYMER LABORATORIES LTD.社製標準物質)(POLYSTYRENE-MEDIUM MOLECULAR WEIGHT CALIBRATION KIT使用)
・分散剤(B)の調製
調製例1(分散剤(B1)の調製)
攪拌機、コンデンサー、温度計、不活性ガス導入管および滴下ロートを備えたフラスコに、イソプロピルアルコール100.0部を入れ、不活性ガス(窒素ガス)を導入し、65℃に昇温した。
第2モノマー成分として、n-ブチルアクリレート46.5部、2-エチルヘキシルアクリレート46.5部、および、アシッドホスホオキシポリオキシプロピレングリコールモノメタクリレート(イオン性基含有モノマー、(株)ユニケミカル製、商品名 ホスマーPP)7.0部を用いた以外は、調製例1と同様にして、重量平均分子量6000、不揮発分50質量%の分散剤(B2)を得た。
攪拌機、コンデンサー、温度計、不活性ガス導入管および滴下ロートを備えたフラスコに、プロピレングリコールモノメチルエーテルアセテート(PMA)100.0部を入れ、不活性ガス(窒素ガス)を導入し、90℃に昇温した。
攪拌機、コンデンサー、温度計、不活性ガス導入管および滴下ロートを備えたフラスコに、プロピレングリコールモノメチルエーテル100.0部を入れ、不活性ガス(窒素ガス)を導入し、60℃に昇温した。
攪拌機、コンデンサー、温度計、不活性ガス導入管および滴下ロートを備えたフラスコに、プロピレングリコールモノメチルエーテル100.0部を入れ、不活性ガス(窒素ガス)を導入し、95℃に昇温した。
攪拌機、コンデンサー、温度計、不活性ガス導入管および滴下ロートを備えたフラスコに、プロピレングリコールモノメチルエーテル100.0部を入れ、不活性ガス(窒素ガス)を導入し、110℃に昇温した。
攪拌機、コンデンサー、温度計、不活性ガス導入管および滴下ロートを備えたフラスコに、プロピレングリコールモノメチルエーテル100.0部を入れ、不活性ガス(窒素ガス)を導入し、115℃に昇温した。
攪拌機、コンデンサー、温度計、不活性ガス導入管および滴下ロートを備えたフラスコに、プロピレングリコールモノメチルエーテル300.0部を入れ、不活性ガス(窒素ガス)を導入し、115℃に昇温した。
第2モノマー成分として、n-ブチルアクリレート62.0部、2-エチルヘキシルアクリレート31.0部、および2-ジメチルアミノエチルアクリレート(イオン性基含有モノマー)7.0部を用いた以外は、調製例1と同様にして、重量平均分子量6000、不揮発分50質量%の分散剤(B9)を得た。
第2モノマー成分として、n-ブチルアクリレート62.0部、2-エチルヘキシルアクリレート31.0部、および、メタクリル酸(イオン性基含有モノマー)7.0部を用いた以外は、調製例1と同様にして、重量平均分子量6000、不揮発分50質量%の分散剤(B10)を得た。
攪拌機、コンデンサー、温度計、不活性ガス導入管および滴下ロートを備えたフラスコに、プロピレングリコールモノメチルエーテル60.0部を入れ、不活性ガス(窒素ガス)を導入し、75℃に昇温した。
攪拌機、コンデンサー、温度計、不活性ガス導入管および滴下ロートを備えたフラスコに、プロピレングリコールモノメチルエーテル40.0部を入れ、不活性ガス(窒素ガス)を導入し、75℃に昇温した。
攪拌機、コンデンサー、温度計、不活性ガス導入管および滴下ロートを備えたフラスコに、プロピレングリコールモノメチルエーテル(PMA)100.0部を入れ、不活性ガス(窒素ガス)を導入し、85℃に昇温した。
攪拌機、コンデンサー、温度計、不活性ガス導入管および滴下ロートを備えたフラスコに、プロピレングリコールモノメチルエーテル(PMA)100.0部を入れ、不活性ガス(窒素ガス)を導入し、100℃に昇温した。
重合開始剤として1,1,3,3テトラメチルブチルペルオキシ2-エチルヘキサノエイト(日油(株)、商品名 パーオクタO)10.0部用いた以外は、調製例3と同様にして、重量平均分子量800、不揮発分50質量%の分散剤(B15)を得た。
攪拌機、コンデンサー、温度計、不活性ガス導入管および滴下ロートを備えたフラスコに、プロピレングリコールモノメチルエーテル(PM)100.0部を入れ、不活性ガス(窒素ガス)を導入し、110℃に昇温した。
攪拌機、コンデンサー、温度計、不活性ガス導入管および滴下ロートを備えたフラスコに、プロピレングリコールモノメチルエーテル(PM)150.0部を入れ、不活性ガス(窒素ガス)を導入し、110℃に昇温した。
第2モノマー成分として、n-ブチルアクリレート46.5部、2-エチルヘキシルアクリレート46.5部、および2-ジメチルアミノエチルアクリレート(イオン性基含有モノマー)7.0部を用いた以外は、調製例2と同様にして、重量平均分子量6000、不揮発分50質量%の分散剤(B18)を得た。
第2モノマー成分として、n-ブチルアクリレート46.5部、2-エチルヘキシルアクリレート46.5部、および、メタクリル酸(イオン性基含有モノマー)7.0部を用いた以外は、調製例2と同様にして、重量平均分子量6000、不揮発分50質量%の分散剤(B19)を得た。
調製例20(ZrO2分散液の調製)
調製例1で得られた分散剤(B1)を18部(不揮発分換算で9部)、金属酸化物粒子として酸化ジルコニウム(石原産業(株)、商品名 PCS90)10部、溶剤としてイソプロピルアルコール72部、分散メディアとして50μmジルコニアビーズ300部を、300mL瓶に入れ、分散機(セイワ技研社製 ロッキングシェーカーRS-05W)を用いて、60Hzにて6時間、酸化ジルコニウムを粉砕し、分散させた。
分散剤として調製例2で得られた分散剤(B2)を用い、また、金属酸化物粒子として酸化チタン(テイカ(株)製、商品名 MT-05)を用いた以外は、調製例20と同様にして、酸化チタンが分散された分散液(TiO2分散液)を得た。
調製例3で得られた分散剤(B3)を12部(不揮発分換算で6部)、金属酸化物粒子としてアンチモンドープ錫(石原産業(株)製、略号:ATO、商品名 SN-100P)20部、溶剤としてイソプロピルアルコール68部、分散メディアとして100μmジルコニアビーズ300部を、300mL瓶に入れ、分散機(セイワ技研社製 ロッキングシェーカーRS-05W)を用いて、60Hzにて6時間金属酸化物粒子を粉砕し、分散させた。その後、ジルコニアビーズをろ過にて取り除くことにより、アンチモンドープ錫が分散された分散液(ATO分散液)を得た。
調製例23((メタ)アクリル樹脂(A1)の調製)
攪拌機、コンデンサー、温度計、不活性ガス導入管および滴下ロートを備えたフラスコに、溶剤として酢酸エチル567.0部、および、トルエン544.8部を加えた。
混合物(1)の溶剤を酢酸エチル512.7部、および、トルエン492.6部とし、第1モノマー成分を、n-ブチルアクリレート568.0部、2-エチルヘキシルアクリレート166.0部、アクリル酸17.5部、酢酸ビニル52.5部、1,6-ヘキサンジオールジアクリレート0.2部、および、2-ヒドロキシエチルアクリレート4.50部、および、アクリロイルモルフォリン17.5部、さらに、溶剤としてのトルエン13.45部に変更し、また、混合物(2)の溶剤をトルエン14.4部とし、第1モノマー成分を2-エチルヘキシルアクリレート41.5部、および、2-ヒドロキシエチルアクリレート4.5部とし、重合開始剤をt-ブチルパーオキシ-2-エチルヘキサネート1.27部に変更した以外は、調製例23と同様にして重量平均分子量340000、数平均分子量14000、不揮発分40質量%の(メタ)アクリル樹脂(A2)を得た。
混合物(1)の溶剤を酢酸エチル456.5部、および、トルエン438.6部とし、第1モノマー成分を、n-ブチルアクリレート544.4部、2-エチルヘキシルアクリレート146.9部、アクリル酸15.8部、酢酸ビニル47.8部、、1,6-ヘキサンジオールジアクリレート0.17部、および、2-ヒドロキシエチルアクリレート4.0部、さらに、溶剤としてのトルエン13.45部に変更し、また、混合物(2)の溶剤をトルエン14.9部、第1モノマー成分を2-エチルヘキシルアクリレート36.7部、2-ヒドロキシエチルアクリレート4.0部、重合開始剤をt-ブチルパーオキシ-2-エチルヘキサネート1.45部に変更した以外は、調製例23と同様にして重量平均分子量310000、数平均分子量21000、不揮発分39質量%の(メタ)アクリル樹脂(A3)を得た。
実施例1
調製例20で得られたZrO2分散液53部(分散剤(B1)4.77部、ZrO25.3部)と、調製例23で得られた(メタ)アクリル樹脂(A1)47部(不揮発分換算で18.33部)と、硬化剤としてコロネートHL(日本ポリウレタン工業(株)製、ヘキサメチレンジイソシアネートのトリメチロールプロパン付加物の75%酢酸エチル溶液)0.2部とを混合撹拌し、粘着剤組成物を調製した。
分散液として調製例21で得られたTiO2分散液53部(分散剤(B2)4.77部、TiO25.3部)を使用し、また、(メタ)アクリル樹脂として調製例24で得られた(メタ)アクリル樹脂(A2)47部(不揮発分換算で18.8部)を使用した以外は、実施例1と同様にして、粘着剤組成物、粘着シート1および粘着シート2を得た。
分散液として調製例22で得られたATO分散液53部(分散剤(B3)3.18部、ATO10.6部)を使用し、また、(メタ)アクリル樹脂として調製例25で得られた(メタ)アクリル樹脂(A3)47部(不揮発分換算で18.33部)を使用した以外は、実施例1と同様にして、粘着剤組成物、粘着シート1および粘着シート2を得た。
分散剤として、調製例4で得られた分散剤(B4)を、不揮発分換算で9部となるように配合した以外は、調製例20と同様にして、ZrO2分散液を得た。
分散剤として、調製例5で得られた分散剤(B5)を、不揮発分換算で9部となるように配合した以外は、調製例20と同様にして、ZrO2分散液を得た。
分散剤として、調製例6で得られた分散剤(B6)を、不揮発分換算で9部となるように配合した以外は、調製例20と同様にして、ZrO2分散液を得た。
調製例20で得られたZrO2分散液53部(分散剤(B1)4.77部、ZrO25.3部)を使用し、また、(メタ)アクリル樹脂として調製例25で得られた(メタ)アクリル樹脂(A3)47部(不揮発分換算で18.8部)を使用した以外は、実施例1と同様にして、粘着剤組成物、粘着シート1および粘着シート2を得た。
分散剤として、調製例7で得られた分散剤(B7)を、不揮発分換算で9部となるように配合した以外は、調製例20と同様にして、ZrO2分散液を得た。
分散剤として、調製例8で得られた分散剤(B8)を、不揮発分換算で9部となるように配合した以外は、調製例20と同様にして、ZrO2分散液を得た。
分散剤として、調製例9で得られた分散剤(B9)を、不揮発分換算で9部となるように配合した以外は、調製例20と同様にして、ZrO2分散液を得た。
分散剤として、調製例10で得られた分散剤(B10)を、不揮発分換算で9部となるように配合した以外は、調製例20と同様にして、ZrO2分散液を得た。
分散剤として、調製例11で得られた分散剤(B11)を、不揮発分換算で6部となるように配合した以外は、調製例22と同様にして、ATO分散液を得た。
分散剤として、調製例12で得られた分散剤(B12)を、不揮発分換算で6部となるように配合した以外は、調製例22と同様にして、ATO分散液を得た。
分散剤として、調製例13で得られた分散剤(B13)を、不揮発分換算で6部となるように配合した以外は、調製例22と同様にして、ATO分散液を得た。
分散剤として、調製例14で得られた分散剤(B14)を、不揮発分換算で6部となるように配合した以外は、調製例22と同様にして、ATO分散液を得た。
分散剤として、調製例15で得られた分散剤(B15)を、不揮発分換算で6部となるように配合した以外は、調製例22と同様にして、ATO分散液を得た。
分散剤として、調製例16で得られた分散剤(B16)を、不揮発分換算で6部となるように配合した以外は、調製例22と同様にして、ATO分散液を得た。
分散剤として、調製例17で得られた分散剤(B17)を、不揮発分換算で6部となるように配合した以外は、調製例22と同様にして、ATO分散液を得た。
分散剤として、調製例18で得られた分散剤(B18)を用い、調製例21と同様にして、TiO2分散液を得た。
分散剤として、調製例19で得られた分散剤(B19)を用い、調製例21と同様にして、TiO2分散液を得た。
分散剤として、市販の分散剤(商品名ソルスパース56000、ポリエステル樹脂系分散剤、アビシア製、融点55℃、酸価23mgKOH/g)を、不揮発分換算で9部となるように配合した以外は、調製例20と同様にして、ZrO2分散液を得た。
以下に示す方法により、粘着シート1を用いて粘着力を評価した。また、粘着シート2を用いて光学特性を評価した。さらに、粘着剤組成物(粘着シート成型前の組成物)を用いて、分散性を評価した。その結果を、表1および表2に示す。
(1)粘着シートの粘着力
粘着シート1の75μm剥離処理済PETフィルムを剥離し、JIS Z 0237(2009年)に準拠して、測定した。
(2)光学特性(ヘイズおよび透過率)
粘着シート2の75μm剥離処理済PETフィルムを剥離し、ガラス板に張り付け、50μm剥離処理済PETフィルムを剥離して、ヘイズおよび全光線透過率(%)を、ヘイズメーターにより測定した。測定には、日本電色工業(株)製のヘイズメーターNDH2000を使用した。得られた結果を表に併せて示す。
(3)分散性
粘着剤組成物を、25℃において2週間放置し、その分散性を、目視により評価した。その結果を、表1および表2に示す。
◎・・・6ヶ月後に金属酸化物粒子の沈降が確認されなかった。
○・・・1ヶ月後に金属酸化物粒子の沈降が確認されなかった。
△・・・2週間後に金属酸化物粒子の沈降が確認されなかった。
×・・・2週間後に金属酸化物粒子の沈降が確認された。
上記結果から、イオン性基を有する(メタ)アクリル樹脂である分散剤を用いた粘着剤組成物は、ポリエステル樹脂系分散剤を用いた場合と比較して、粘着剤組成物のヘイズを向上できていることが分かる。これは、ポリエステル樹脂系分散剤に比べ、イオン性基を有するアクリル樹脂である分散剤が(A)(メタ)アクリル樹脂との相溶性が高く、金属酸化物粒子をより良好に粘着剤組成物中に分散できたためと推察される。
Claims (4)
- (A)(メタ)アクリル樹脂と、
(B)分散剤と、
(C)金属酸化物粒子と
を含有し、
前記(B)分散剤が、
イオン性基を有し、重量平均分子量200以上50000以下の(メタ)アクリル樹脂からなる
ことを特徴とする、粘着剤組成物。 - 前記イオン性基が、リン酸基であり、
前記(C)金属酸化物粒子が、酸化ジルコニウムおよび/または酸化チタンである、請求項1に記載の粘着剤組成物。 - 前記イオン性基が、3級アミノ基であり、
前記(C)金属酸化物粒子が、アンチモンドープ酸化スズである、請求項1に記載の粘着剤組成物。 - 請求項1~3のいずれか一項に記載の粘着剤組成物が、層状に成形されてなることを特徴とする、粘着シート。
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JP2021063152A (ja) * | 2019-10-10 | 2021-04-22 | リンテック株式会社 | 表示体および粘着シート |
WO2021112114A1 (ja) * | 2019-12-03 | 2021-06-10 | 王子ホールディングス株式会社 | 粘着シート、粘着シートの製造方法および着色剤を選択する方法 |
JP2021091888A (ja) * | 2019-12-03 | 2021-06-17 | 王子ホールディングス株式会社 | 粘着シート、粘着シートの製造方法および着色剤を選択する方法 |
JP2021091889A (ja) * | 2019-12-03 | 2021-06-17 | 王子ホールディングス株式会社 | 粘着シート、粘着シートの製造方法および着色剤を選択する方法 |
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WO2021153497A1 (ja) * | 2020-01-31 | 2021-08-05 | 日東電工株式会社 | 粘着シート |
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CN107109164B (zh) | 2019-06-21 |
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