WO2021003695A1 - Pressure-sensitive adhesive composition and surface protective film - Google Patents

Pressure-sensitive adhesive composition and surface protective film Download PDF

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Publication number
WO2021003695A1
WO2021003695A1 PCT/CN2019/095402 CN2019095402W WO2021003695A1 WO 2021003695 A1 WO2021003695 A1 WO 2021003695A1 CN 2019095402 W CN2019095402 W CN 2019095402W WO 2021003695 A1 WO2021003695 A1 WO 2021003695A1
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WIPO (PCT)
Prior art keywords
mass
parts
meth
sensitive adhesive
pressure
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PCT/CN2019/095402
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French (fr)
Inventor
Yasuo Ooji
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Dic Corporation
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Publication date
Application filed by Dic Corporation filed Critical Dic Corporation
Priority to CN201980097539.4A priority Critical patent/CN113993964B/en
Priority to PCT/CN2019/095402 priority patent/WO2021003695A1/en
Priority to JP2021536687A priority patent/JP7060165B2/en
Publication of WO2021003695A1 publication Critical patent/WO2021003695A1/en

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Classifications

    • 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
    • C09J133/062—Copolymers with monomers not covered by C09J133/06
    • C09J133/066—Copolymers with monomers not covered by C09J133/06 containing -OH groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/10—Esters
    • C08F220/12—Esters of monohydric alcohols or phenols
    • C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
    • C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
    • C08F220/1808—C8-(meth)acrylate, e.g. isooctyl (meth)acrylate or 2-ethylhexyl (meth)acrylate
    • 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

Definitions

  • the present invention relates to a pressure-sensitive adhesive composition and a surface protective film.
  • a surface protective film is used for the purpose of protecting the surfaces of a variety of components from dirt and scratches.
  • the surface protective film is applied to an optical member or the like and, at a stage when surface protection is no longer necessary, is peeled away from the optical member or the like.
  • an acrylic pressure-sensitive adhesive which includes an acrylic resin crosslinked with an isocyanate-based crosslinking agent and a metal-chelate-based crosslinking agent, which are mixed at a specific ratio (see Patent Literature 1, for example) .
  • Patent Literature 1 which is known in the related art, was used in a surface protective film, there were cases in which, when an adherend object to which the surface protective film was applied was placed in a high-temperature and high-humidity environment, white dot-like spots remained on the adherend object.
  • the present invention has been made in view of such circumstances, and an object of the present invention is to provide a pressure-sensitive adhesive composition that inhibits an adherend object to which a surface protective film is applied from being contaminated even in a case where the adherend object is stored in a high-temperature and high-humidity environment.
  • a pressure-sensitive adhesive composition of the present invention includes an acrylic resin (A) , a curing agent (B) , and a fluorinated additive (C) .
  • the curing agent (B) includes a multifunctional isocyanate compound.
  • the acrylic resin (A) is a hydroxyl-group-containing acrylic resin.
  • a content of the multifunctional isocyanate compound is 1 part by mass or greater per 100 parts by mass of the acrylic resin (A) .
  • a content of the fluorinated additive (C) is 0.01 parts by mass or greater and 6 parts by mass or less per 100 parts by mass of the acrylic resin (A) .
  • an adherend object can be inhibited from being contaminated even after the surface protective film is applied to the adherend object and the adherend object is placed in a high-temperature and high-humidity environment.
  • the pressure-sensitive adhesive composition of the present invention includes an acrylic resin (A) , a curing agent (B) , and a fluorinated additive (C) .
  • the acrylic resin (A) is a hydroxyl-group-containing acrylic resin and preferably a (co) polymer of monomers (mixture) including a hydroxyl-group-containing monomer (a1) and a (meth) acrylic acid ester (a2) .
  • (meth) acrylic refers to acrylic and/or methacrylic
  • (meth) acrylate refers to acrylate and/or methacrylate.
  • the hydroxyl-group-containing monomer (a1) may be one or more hydroxyl-group-containing monomers, examples of which include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 1, 4-cyclohexanedimethanol (meth) acrylate, polyethylene glycol mono (meth) acrylate, and glycerol monomethacrylate.
  • 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, and 4-hydroxybutyl (meth) acrylate are preferable.
  • the content of the hydroxyl-group-containing monomer (a1) is preferably 0.5 parts by mass or greater, more preferably 1 part by mass or greater, and even more preferably 3 parts by mass or greater and is preferably 30 parts by mass or less, more preferably 15 parts by mass or less, and even more preferably 12 parts by mass or less, per 100 parts by mass of the total monomers (mixture) .
  • the (meth) acrylic acid ester (a2) may be one or more (meth) acrylic acid esters, examples of which include aliphatic (meth) acrylic acid esters, such as methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth acrylate, isopropyl (meth) acrylate, n-butyl (meth acrylate, isobutyl (meth) acrylate, t-butyl (meth acrylate, n-pentyl (meth) acrylate, isopentyl (meth acrylate, neopentyl (meth) acrylate, hexyl (meth acrylate, heptyl (meth) acrylate, n-octyl (meth acrylate, 2-ethylhexyl (meth) acrylate, isooctyl (meth acrylate, n-nonyl (
  • an aliphatic (meth) acrylic acid ester and an alkoxypolyalkylene glycol (meth) acrylate be included.
  • the carbon number of the hydrocarbon group bonded to the (meth) acryloxy group of the aliphatic (meth) acrylic acid ester or the alicyclic (meth) acrylic acid ester is preferably not less than one and is preferably not greater than 20, more preferably not greater than 14, even more preferably not greater than 10, and particularly preferably not greater than 8.
  • the aliphatic (meth) acrylic acid ester include a (meth) acrylate containing a linear or branched alkyl group having 4 or greater and 14 or less carbon atoms (more preferably not greater than 10 carbon atoms, and even more preferably not greater than 8 carbon atoms) . It is more preferable that the aliphatic (meth) acrylic acid ester include n-butyl (meth) acrylate and/or 2-ethylhexyl (meth) acrylate.
  • the (meth) acrylate containing a linear or branched alkyl group having 4 or greater and 14 or less carbon atoms be an alkyl acrylate containing a linear or branched alkyl group having 4 or greater and 14 or less carbon atoms.
  • the alkyl group in the case where the alkyl group is a branched alkyl group, the alkyl group may have 12 or greater and 20 or less carbon atoms.
  • the number of carbon atoms in the case of linear alkyl groups, if the number of carbon atoms is high (12 or greater, for example) , crystallinity develops, which makes it difficult for pressure-sensitive adhesiveness to be exhibited.
  • development of crystallinity can be inhibited even when the number of carbon atoms is high.
  • the (meth) acrylic acid ester (a2) include an alkyl (meth) acrylate containing an alkyl group having 1 or greater and 3 or less carbon atoms (more preferably, not greater than 2 carbon atoms) . It is more preferable that the (meth) acrylic acid ester (a2) include methyl (meth) acrylate. It is preferable that the (meth) acrylate containing an alkyl group having 1 or greater and 3 or less carbon atoms be an alkyl methacrylate.
  • the content of the alkyl (meth) acrylate containing an alkyl group having 1 or greater and 3 or less carbon atoms is preferably 1 part by mass or greater and more preferably 2 parts by mass or greater and is preferably 50 parts by mass or less and more preferably 40 parts by mass or less, per 100 parts by mass of the (meth) acrylate (a2) containing an alkyl group having 4 or greater and 14 or less carbon atoms.
  • the percentage content of the (meth) acrylic acid ester (a2) is preferably 50 mass%or greater, more preferably 70 mass%or greater, and even more preferably 90 mass%or greater and is preferably 99 mass%or less and more preferably 98 mass%or less, based on the total amount of the mixture of monomers.
  • the monomers (mixture) further include a carboxyl-group-containing monomer (a3) .
  • the carboxy-group-containing monomer (a3) may be one or more carboxy-group-containing monomers, examples of which include unsaturated monocarboxylic acids, such as (meth) acrylic acid; (meth) acrylic esters of a monocarboxylic acid, such as ⁇ -carboxyethyl (meth) acrylate and 2- (meth) acryloyl propionic acid; unsaturated dicarboxylic acids, such as crotonic acid, itaconic acid, maleic acid, fumaric acid, phthalic acid, and succinic acid; (meth) acrylic half esters of the foregoing unsaturated dicarboxylic acids; anhydrides of the foregoing unsaturated dicarboxylic acids; and compounds of the foregoing unsaturated dicarboxylic acids in each of which a (meth) acryloxyalkyl group (preferably, (meth) acryloxyethyl group) is attached to at least one of the carboxy groups.
  • the content of the carboxy-group-containing monomer (a3) is preferably 0.01 parts by mass or greater and more preferably 0.05 parts by mass or greater and is preferably 10 parts by mass or less, more preferably 5 parts by mass or less, and even more preferably 1 part by mass or less, per 100 parts by mass of the monomers (mixture) .
  • the monomers (mixture) may include one or more additional monomers (a4) , which are different from the hydroxyl group-containing monomer (a1) , the (meth) acrylic acid ester (a2) , and the carboxyl-group-containing monomer (a3) .
  • additional monomers (a4) include nitrogen-functional-group-containing monomers, keto-group-containing monomers, silyl-group-containing monomers, and phosphate-group-containing monomers.
  • the nitrogen functional group is a functional group containing a nitrogen atom.
  • the nitrogen-functional-group-containing monomer include cyclic amides, such as N-vinylpyrrolidone, N-vinylpiperidone, N- vinylmorpholinone, N-vinylcaprolactam, N-cyclohexylmaleimide, N-butyl maleimide, N-phenylmaleimide, N- (meth) acryloylmorpholine, N- (meth) acryloylpyrrolidone, N- (meth) acryloylpiperidine, N- (meth) acryloylpyrrolidine, and N- (meth) acryloyl-4-piperidone; substituted (meth) acrylamides, such as (meth) acrylonitrile, (meth) acrylamide, N, N-dimethyl (meth) acrylamide, N, N-diethyl (meth) acrylamide, N-methylol (
  • keto-group-containing monomer examples include diacetone (meth) acrylamide.
  • silyl-group-containing monomer examples include 3- (meth) acryloxypropyl trimethoxysilane and 3- (meth) acryloxypropyl methyldimethoxysilane.
  • phosphate-group-containing monomer examples include phosphate esters of polyethylene glycol mono (meth) acrylate (e.g., SIPOMER PAM-100, manufactured by Rhodia Nicca Ltd. ) .
  • the percentage content of the one or more additional monomers (a4) is preferably 20 mass%or less, more preferably 10 mass%or less, even more preferably 5 mass%or less, still more preferably 1 mass%or less, still even more preferably 0.1 mass%or less, and particularly preferably 0 mass%, based on the total amount of the mixture of monomers.
  • the acrylic resin (A) may be produced by polymerizing the mixture of monomers.
  • Examples of the method for polymerization include radical polymerization methods, anionic polymerization methods, and cationic polymerization methods. Radical polymerization methods are preferable.
  • the radical polymerization method may be a method in which the mixture of monomers, a polymerization initiator, and an optionally used organic solvent are mixed together and stirred to promote the polymerization reaction.
  • the polymerization initiator may be one or more polymerization initiators, examples of which include peroxide initiators and azo initiators.
  • peroxide initiator examples include dilauroyl peroxide, 1, 1, 3, 3-tetramethylbutyl peroxy-2-ethylhexanoate, disuccinic acid peroxide, 2, 5-dimethyl-2, 5-di (2-ethyl hexanoyl peroxy) hexane, t-butyl peroxyisobutyrate, t-butyl peroxy-2-ethylhexanoate, t-amyl peroxyisobutyrate, t-amyl peroxy-2-ethylhexanoate, t-hexyl peroxy-2-ethylhexanoate, t-hexyl peroxypivalate, di (3-methylbenzoyl) peroxide, benzoyl (3-methylbenzoyl) peroxide, and dibenzoyl peroxide.
  • Examples of the azo initiator include 2, 2′-azobis (4-methoxy-2, 4-dimethylvaleronitrile) , 2, 2′-azobis (2, 4-dimethylvaleronitrile) , 2, 2′-azobis (isobutyronitrile) , 2, 2′-azobis (2-methylbutyronitrile) , and 1, 1′-azobis (cyclohexane-1-carbonitrile) .
  • a chain transfer agent may coexist.
  • the chain transfer agent include lauryl mercaptan, glycidyl mercaptan, mercapto acetic acid, 2-mercaptoethanol, thioglycolic acid, 2-ethylhexyl thioglycolate, ⁇ -pinene, ⁇ -pinene, terpinolene, and ⁇ -methylstyrene dimers.
  • chain transfer agents may be used alone or in a combination of two or more.
  • the polymerization temperature be 20°C or higher and i00°C or lower.
  • a thermal decomposition initiator such as an azo initiator or a persulfate initiator
  • selecting a thermal decomposition initiator having a 10-hour half-life temperature that is within the reaction temperature or near the reaction temperature makes it easy to control the reaction, so that the amount of residual undecomposed initiator at the end of the reaction can be reduced.
  • the weight average molecular weight of the obtained acrylic resin (A) is preferably 100,000 or greater, more preferably 300,000 or greater, and even more preferably 500,000 or greater and is preferably 2,000,000 or less and more preferably 1,000,000 or less, from the standpoint of adhesion.
  • the weight average molecular weight can be determined by gel permeation chromatography (GPC) by using polystyrene standards.
  • the weight average molecular weight of the acrylic resin be within the above-mentioned molecular weight ranges and have a single symmetrical peak in a GPC measurement.
  • the curing agent (B) includes a multifunctional isocyanate compound.
  • the multifunctional isocyanate compound may be one or more multifunctional isocyanate compounds, examples of which include polyisocyanates, such as tolylene diisocyanate, chlorophenylene diisocyanate, hexamethylene diisocyanate, tetramethylene diisocyanate, xylylene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, and hydrogenated diphenylmethane diisocyanate; trimethylolpropane adducts thereof; isocyanurates thereof; biurets thereof; adducts thereof; and polymethylene polyphenyl polyisocyanates.
  • polyisocyanates such as tolylene diisocyanate, chlorophenylene diisocyanate, hexamethylene diisocyanate, tetramethylene diisocyanate, xylylene diiso
  • the content of the multifunctional isocyanate compound is 1 part by mass or greater and preferably 2 parts by mass or greater and is preferably 10 parts by mass or less, more preferably 7 parts by mass or less, and even more preferably 5 parts by mass or less, per 100 parts by mass of the acrylic resin (A) .
  • the percentage content of the multifunctional isocyanate compound, in the curing agent (B) is preferably 50 mass%or greater, more preferably 70 mass%or greater, and even more preferably 80 mass%or greater and is preferably 100 mass%or less.
  • the curing agent (B) further include at least one selected from the group consisting of metal chelate curing agents and epoxy crosslinking agents.
  • the metal chelate curing agent may be one or more metal chelate curing agents, examples of which include compounds including a metal and chelating agents coordinated thereto.
  • the metal may be one or more metals, examples of which include multivalent metals, such as aluminum, iron, copper, zinc, tin, titanium, nickel, antimony, magnesium, vanadium, chromium, and zirconium. In particular, aluminum, titanium, zirconium, and the like are preferable.
  • the chelating agent may be one or more chelating agents, examples of which include ⁇ -dicarbonyl compounds and carbonyl compounds containing a hydroxyl group or an amino group in the ⁇ position.
  • ⁇ -dicarbonyl compound include ⁇ -diketone compounds, such as acetyl acetone, 2, 4-hexanedione, 2, 4-heptanedione, 3, 5-heptanedione, 2, 4-octanedione, 3, 5-octanedione, 2, 4-nonanedione, 3, 5-nonanedione, and 5-methyl-2, 4-hexanedione; ⁇ -keto ester compounds, such as methyl acetoacetate, ethyl acetoacetate, propyl acetoacetate, isopropyl acetoacetate, butyl acetoacetate, isobutyl acetoacetate, s-butyl acetoacetate, t-but
  • Examples of the carbonyl compound containing a hydroxyl group or an amino group in the ⁇ position include diacetone alcohol, diacetone amine, salicylaldehyde, methyl salicylate, and N-methyl salicylamide.
  • ⁇ -dicarbonyl compounds are preferable, and ⁇ -diketone compounds are preferable.
  • the metal chelate curing agent be a compound in which a ⁇ -dicarbonyl compound (preferably, ⁇ -diketone compound) is coordinated to aluminum, titanium, zirconium, or the like.
  • the content of the metal chelate curing agent is preferably 0.1 parts by mass or greater, more preferably 0.5 parts by mass or greater, and even more preferably 1 part by mass or greater and is preferably 10 parts by mass or less, more preferably 7 parts by mass or less, and even more preferably 5 parts by mass or less, per 100 parts by mass of the multifunctional isocyanate compound.
  • the epoxy curing agent may be one or more epoxy curing agents, examples of which include bisphenol A epichlorohydrin-type epoxy resins, ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, glycerol diglycidyl ether, glycerol triglycidyl ether, 1, 6-hexanediol diglycidyl ether, trimethylolpropane triglycidyl ether, sorbitol polyglycidyl ether, polyglycerol polyglycidyl ether, pentaerythritol polyglycidyl erythritol, diglycerol polyglycidyl ether, 1, 3-bis (N, N-diglycidylaminomethyl) cyclohexane, and N, N, N′, N′-tetraglycidyl-m-xylene diamine.
  • bisphenol A epichlorohydrin-type epoxy resins
  • the content of the epoxy curing agent is preferably 0.1 parts by mass or greater, more preferably 0.5 parts by mass or greater, and even more preferably 1 part by mass or greater and is preferably 10 parts by mass or less, more preferably 7 parts by mass or less, and even more preferably 5 parts by mass or less, per 100 parts by mass of the multifunctional isocyanate compound.
  • the curing agent (B) may include an additional curing agent, which is different from the multifunctional isocyanate compound, the metal chelate curing agent, and the epoxy crosslinking agent.
  • the additional curing agent may be one or more additional curing agents, examples of which include multivalent metal salt curing agents, keto-hydrazide curing agents, oxazoline curing agents, silane curing agents, aziridine curing agents, melamine curing agents, and aldehyde curing agents.
  • the content of the additional curing agent is preferably 10 mass%or less, more preferably 5 mass%or less, and even more preferably 1 mass%or less, based on the total amount of the curing agent (B) .
  • the content of the curing agent (B) is preferably 1 part by mass or greater and more preferably 1.5 parts by mass or greater and is preferably 10 parts by mass or less, more preferably 8 parts by mass or less, and even more preferably 6 parts by mass or less, per 100 parts by mass of the acrylic resin (A) .
  • the fluorinated additive (C) may be preferably a fluorosurfactant, more preferably a surfactant in which fluorinated hydrocarbon groups are included as hydrophobic groups, and even more preferably a fluorinated-hydrocarbon-group-containing anionic surfactant, a fluorinated-hydrocarbon-group-containing nonionic surfactant, a fluorinated-hydrocarbon-group-containing amphoteric surfactant, or the like. It is preferable that the fluorinated hydrocarbon group be a fluoroalkyl group having 1 to 10 carbon atoms or a fluoroalkenyl group having 1 to 10 carbon atoms.
  • the fluorinated-hydrocarbon-group-containing anionic surfactant may be one or more fluorinated-hydrocarbon-group-containing anionic surfactants, examples of which include fluorinated-hydrocarbon-group-and hydroxyl-group-containing anionic surfactants, fluorinated-hydrocarbon-group-and carboxyl-group-containing anionic surfactants, and fluorinated-hydrocarbon-group-and sulfonic-acid-group-containing surfactants.
  • the fluorinated-hydrocarbon-group-containing nonionic surfactant may be one or more fluorinated-hydrocarbon-group-containing nonionic surfactants, examples of which include alkylene oxide (preferably, ethylene oxide) adducts and/or alkylene sulfide adducts of a fluorinated hydrocarbon and alkyl ethers of alkylene oxide (preferably, ethylene oxide) adducts and/or alkylene sulfide adducts of a fluorinated hydrocarbon.
  • alkylene oxide preferably, ethylene oxide
  • alkyl ethers of alkylene oxide preferably, ethylene oxide
  • the fluorinated additive (C) may be an organosilyl-group-and/or dialkylsiloxane-chain-containing additive.
  • the content of the fluorinated additive (C) is preferably 0.01 parts by mass or greater and more preferably 0.03 parts by mass or greater and is preferably 6 parts by mass or less, more preferably 3 parts by mass or less, and even more preferably 2 parts by mass or less, per 100 parts by mass of the acrylic resin (A) .
  • the pressure-sensitive adhesive composition of the present invention further include an antioxidant (D) .
  • the antioxidant (D) include radical-scavenging primary antioxidants, such as phenolic antioxidants and amine-based antioxidants; and peroxide-decomposing secondary antioxidants, such as phosphorus-based antioxidants and sulfur-based antioxidants.
  • phenolic antioxidant examples include triethylene glycol-bis- [3- (3-t-butyl-5-methyl-4-hydroxyphenyl) propionate] , pentaerythritol tetrakis [3- (3, 5- di-tert-butyl-4-hydroxyphenyl) propionate, octadecyl [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, thiodiethylene bis [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate] , benzenepropanoic acid-3, 5-bis (1, 1-dimethylethyl) -4-hydroxy-C 7 -C 9 -side-chain-alkyl ester, 4, 6-bis (dodecylthiomethyl) -o-cresol, reaction products of N-phenyl benzenamine and 2, 4, 4-trimethylpentene, 2-t-butyl-6- (3-t-butyl
  • amine-based antioxidant examples include bis (2, 2, 6, 6-tetramethyl-4-piperidyl) sebacate, bis (1, 2, 2, 6, 6-pentamethyl-4-piperidyl) sebacate, 1, 2, 3, 4-tetrakis (2, 2, 6, 6-tetramethyl-4-piperidyloxycarbonyl) butane, a polycondensate of dimethyl succinate and 1- (2-hydroxyethyl) -4-hydroxy-2, 2, 6, 6-tetramethylpiperidine, 1- (3, 5-di-t-butyl-4-hydroxyphenyl) -1, 1-bis (2, 2, 6, 6-tetramethyl-4-piperidyloxycarbonyl) pentane, N, N-bis (3-aminopropyl) ethylenediamine, 4-benzoyloxy-2, 2, 6, 6-tetramethylpiperidine, bis (octylon-2, 2, 6, 6-tetramethyl-4-piperidyl) sebacate, and bis (1, 2, 2, 6, 6-pentamethyl-4-piperidy
  • Examples of the phosphorus-based antioxidant include triphenylphosphine, bis (2, 4-di-tert-butyl-6-methylphenyl) ethyl phosphite, triphenyl phosphite, trisnonylphenyl phosphite, tris (2, 4-dibutylphenyl) phosphite, tris (2, 4-dibutyl-5-methylphenyl) phosphite, tris [2-tert-butyl-4- (3-butyl-4-hydroxy-5-methylphenylthio) -5-methylphenyl] phosphite, tris (2, 4-di-tert-butylphenyl) phosphite, tridecyl phosphite, octyl diphenyl phosphite, di (decyl) monophenyl phosphite, di (tridecyl) pentaerythri
  • sulfur-based antioxidant examples include didodecyl-3, 3′-thiopropionate, dilauryl-3, 3′-thiodipropionate, dilauryl thiodipropionate, ditridecyl-3, 3′-thiodipropionate, dimyristyl-3, 3′-thiodipropionate, distearyl-3, 3′-thiodipropionate, tetrakis-methylene-3-laurylthiopropionate methane, distearyl-3, 3′-methyl-3, 3′-thiodipropionate, lauryl stearyl-3, 3′-thiodipropionate, bis [2-methyl-4- (3-n-alkylthiopropionyloxy) -5-t-butylphenyl] sulfide, ⁇ -lauryl thiopropionate, 2-mercaptobenzimidazole, 2-mercapto-5-methylbenzimidazole, and di
  • the antioxidant (D) is preferably a primary antioxidant and more preferably a phenolic antioxidant.
  • the content of the primary antioxidant (preferably, phenolic antioxidant) , in the antioxidant (D) is preferably 80 mass%or greater and more preferably 90 mass%or greater and is 100 mass%or less.
  • the content of the antioxidant (D) is preferably 0.01 parts by mass or greater and more preferably 0.03 parts by mass or greater and is preferably 2 parts by mass or less, more preferably 1 part by mass or less, and even more preferably 0.5 parts by mass or less, per 100 parts by mass of the acrylic resin (A) .
  • the pressure-sensitive adhesive composition of the present invention may further include a solvent (E) .
  • the solvent (E) may be one or more solvents and is preferably a solvent that does not interfere with the reaction with the isocyanate-based crosslinking agent.
  • the solvent (E) include aromatic hydrocarbon solvents, such as toluene, o-xylene, m-xylene, and p-xylene; ester solvents, such as methyl acetate, ethyl acetate, and butyl acetate; ketone solvents, such as methyl ethyl ketone, methyl isobutyl ketone, acetone, cyclohexanone, and 3-pentanone; and hydrocarbon solvents, such as hexane and heptane, cyclohexane, and methylcyclohexane.
  • the content of the solvent (E) is preferably 10 parts by mass or greater and is preferably 2,000 parts by mass or less, per 100 parts by mass of the acrylic polymer (A) .
  • the pressure-sensitive adhesive composition of the present invention may further include one or more additional additives, examples of which include tackifying resins, colorants such as pigments and dyes, plasticizers, softeners, antioxidants, fillers, film-forming agents, leveling agents, wetting agents, thickeners (viscosity modifiers) , water repellents, and antifoaming agents.
  • additional additives examples of which include tackifying resins, colorants such as pigments and dyes, plasticizers, softeners, antioxidants, fillers, film-forming agents, leveling agents, wetting agents, thickeners (viscosity modifiers) , water repellents, and antifoaming agents.
  • the content of the one or more additional additives be greater than 0 parts by mass and 30 parts by mass or less, per 100 parts by mass of the acrylic resin (A) .
  • Pressure-sensitive adhesive layers formed from the pressure-sensitive adhesive composition of the present invention and pressure-sensitive adhesive films or sheets including such a pressure-sensitive adhesive layer are also encompassed in the technical scope of the present invention.
  • the pressure-sensitive adhesive film or sheet is preferably one that includes a substrate layer and a pressure-sensitive adhesive layer formed from the pressure-sensitive adhesive composition of the present invention and is more preferably one that includes a substrate layer, such a pressure-sensitive adhesive layer, and a release film layer (preferably, layered in this order) .
  • the substrate layer is preferably a layer of a plastic substrate and may be in the form of a sheet or film.
  • the plastic include polyesters, such as polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate; polyolefins; poly (meth) acrylates; polyvinyl chlorides; polyethylenes; polypropylene/ethylene vinyl alcohols; polyurethanes, polyamides, and polyimides.
  • the surface of the substrate layer may be, for example, a release-treated, antistatic-treated, and/or corona-treated surface. It is preferable that the substrate layer have a thickness of 2 ⁇ m or greater and 200 ⁇ m or less.
  • the method for producing the pressure-sensitive adhesive film or sheet may be, for example, a method in which the pressure-sensitive adhesive composition is coated onto a plastic substrate and then dried and cured to obtain a pressure-sensitive adhesive layer, and as necessary, a release film is laminated onto the pressure-sensitive adhesive layer.
  • the resin composition, the pressure-sensitive adhesive composition, and the pressure-sensitive adhesive sheet of the present invention are used in a surface protective film, it is possible to inhibit adherend objects from being contaminated by the surface protective film even in a case where the adherend objects are placed in a high-temperature and high-humidity environment.
  • the resin composition, the pressure-sensitive adhesive composition, and the pressure-sensitive adhesive sheet of the present invention are suitable for use in a variety of industrial applications, such as automobiles, electronic devices, and home appliances, and are particularly useful for a surface protective film used when forming glass articles that are to be used in electronic devices (e.g., portable electronic terminal devices and PC tablets) .
  • Each of the pressure-sensitive adhesives (1) to (7) and (X1) to (X3) being mixed with a crosslinking agent, was coated onto the surface of a polyethylene terephthalate (PET) film 6 ⁇ m in thickness in a manner such that the dried film thickness of the pressure-sensitive adhesive was 6 ⁇ m and then dried at 80°C for 3 minutes.
  • PET polyethylene terephthalate
  • a PET film having a thickness of 38 ⁇ m and a release-treated surface was laminated onto the resultant and then cured at 40°C for 3 days to obtain a test piece.
  • the test piece prepared using the above-described method was applied to both sides of a glass sheet.
  • the resultant was subjected to heat treatment at 200°C for 1 hour, at room temperature for 30 minutes, at 100°C for 1 hour, at room temperature for 30 minutes, and at 140°C for 45 minutes and was then left standing in an environment of 23°C for 30 minutes.
  • the pressure-sensitive adhesive film was peeled away from the glass sheet, and LED light was radiated from below the glass sheet. A contamination status was checked on the basis of the following evaluation criteria.
  • a test piece was prepared by cutting the test piece prepared using the above-described method into a piece 25 mm in width.
  • the test piece was applied to a glass sheet in a manner such that the adhesion area was 25 mm ⁇ 60 mm, by reciprocating a 2-kg roller twice.
  • a 180-degree peel strength was measured in an atmosphere of 23°C and 50%RH. This was taken as an initial adhesive strength.

Abstract

Disclosed is a pressure-sensitive adhesive composition that inhibits an adherend object to which a surface protective film is applied from being contaminated even in a case where the adhered object is stored in a high-temperature and high-humidity environment. The said pressure-sensitive adhesive composition includes an acrylic resin (A), a curing agent (B), and a fluorinated additive (C). The curing agent (B) includes a multifunctional isocyanate compound. The acrylic resin (A) is a hydroxyl-group-containing acrylic resin. A content of the multifunctional isocyanate compound is 1 part by mass or greater per 100 parts by mass of the acrylic resin (A). A content of the fluorinated additive (C) is 0.01 parts by mass or greater and 6 parts by mass or less per 100 parts by mass of the acrylic resin (A).

Description

PRESSURE-SENSITIVE ADHESIVE COMPOSITION AND SURFACE PROTECTIVE FILM Technical Field
The present invention relates to a pressure-sensitive adhesive composition and a surface protective film.
Background Art
A surface protective film is used for the purpose of protecting the surfaces of a variety of components from dirt and scratches. For example, in the process of manufacturing a display device, the surface protective film is applied to an optical member or the like and, at a stage when surface protection is no longer necessary, is peeled away from the optical member or the like.
As a pressure-sensitive adhesive for use in the surface protective film, an acrylic pressure-sensitive adhesive is known which includes an acrylic resin crosslinked with an isocyanate-based crosslinking agent and a metal-chelate-based crosslinking agent, which are mixed at a specific ratio (see Patent Literature 1, for example) .
Citation List
Patent Literature
PTL 1: Japanese Unexamined Patent Application Publication No. 2003-114331
Summary of Invention
Technical Problem
Unfortunately, when the pressure-sensitive adhesive of Patent Literature 1, which is known in the related art, was used in a surface protective film, there were cases in which, when an adherend object to which the surface protective film was applied was placed in a high-temperature and high-humidity environment, white dot-like spots remained on the adherend object. The present invention has been made in view of such circumstances, and an object of the present invention is to provide a pressure-sensitive adhesive composition that inhibits an adherend object to which a surface protective film is applied from being contaminated even in a case where the adherend object is stored in a high-temperature and high-humidity environment.
Solution to Problem
A pressure-sensitive adhesive composition of the present invention includes an acrylic resin (A) , a curing  agent (B) , and a fluorinated additive (C) . The curing agent (B) includes a multifunctional isocyanate compound. The acrylic resin (A) is a hydroxyl-group-containing acrylic resin. A content of the multifunctional isocyanate compound is 1 part by mass or greater per 100 parts by mass of the acrylic resin (A) . A content of the fluorinated additive (C) is 0.01 parts by mass or greater and 6 parts by mass or less per 100 parts by mass of the acrylic resin (A) .
Advantageous Effects of Invention
With a surface protective film obtained by using the pressure-sensitive adhesive composition of the present invention, an adherend object can be inhibited from being contaminated even after the surface protective film is applied to the adherend object and the adherend object is placed in a high-temperature and high-humidity environment. Description of Embodiments
The pressure-sensitive adhesive composition of the present invention includes an acrylic resin (A) , a curing agent (B) , and a fluorinated additive (C) .
The acrylic resin (A) is a hydroxyl-group-containing acrylic resin and preferably a (co) polymer of monomers (mixture) including a hydroxyl-group-containing monomer (a1)  and a (meth) acrylic acid ester (a2) .
Note that, in the present invention, " (meth) acrylic" refers to acrylic and/or methacrylic, and " (meth) acrylate" refers to acrylate and/or methacrylate.
The hydroxyl-group-containing monomer (a1) may be one or more hydroxyl-group-containing monomers, examples of which include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 1, 4-cyclohexanedimethanol (meth) acrylate, polyethylene glycol mono (meth) acrylate, and glycerol monomethacrylate. In particular, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, and 4-hydroxybutyl (meth) acrylate are preferable.
The content of the hydroxyl-group-containing monomer (a1) is preferably 0.5 parts by mass or greater, more preferably 1 part by mass or greater, and even more preferably 3 parts by mass or greater and is preferably 30 parts by mass or less, more preferably 15 parts by mass or less, and even more preferably 12 parts by mass or less, per 100 parts by mass of the total monomers (mixture) .
The (meth) acrylic acid ester (a2) may be one or more  (meth) acrylic acid esters, examples of which include aliphatic (meth) acrylic acid esters, such as methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth acrylate, isopropyl (meth) acrylate, n-butyl (meth acrylate, isobutyl (meth) acrylate, t-butyl (meth acrylate, n-pentyl (meth) acrylate, isopentyl (meth acrylate, neopentyl (meth) acrylate, hexyl (meth acrylate, heptyl (meth) acrylate, n-octyl (meth acrylate, 2-ethylhexyl (meth) acrylate, isooctyl (meth acrylate, n-nonyl (meth) acrylate, isononyl (meth acrylate, n-decyl (meth) acrylate, isodecyl (meth acrylate, undecyl (meth) acrylate, dodecyl (meth acrylate, tridecyl (meth) acrylate, tetradecyl (meth acrylate, n-octadecyl (meth) acrylate, and isooctadecyl (meth acrylate; alicyclic (meth) acrylic acid esters, such as cyclohexyl (meth) acrylate, isobornyl (meth) acrylate, dicyclopentanyl (meth) acrylate, dicyclopentenyl (meth) acrylate, and dicyclopentenyloxyethyl (meth) acrylate; alkoxyalkylene glycol (meth) acrylate, such as methoxyethylene glycol (meth) acrylate and ethoxyethylene glycol (meth) acrylate; and alkoxypolyalkylene glycol (meth) acrylate, such as methoxypolyethylene glycol (meth) acrylate, ethoxypolyethylene glycol (meth) acrylate, and methoxypolypropylene glycol (meth) acrylate.
In particular, it is preferable that an aliphatic (meth) acrylic acid ester and an alkoxypolyalkylene glycol (meth) acrylate be included.
The carbon number of the hydrocarbon group bonded to the (meth) acryloxy group of the aliphatic (meth) acrylic acid ester or the alicyclic (meth) acrylic acid ester is preferably not less than one and is preferably not greater than 20, more preferably not greater than 14, even more preferably not greater than 10, and particularly preferably not greater than 8.
In particular, it is preferable that the aliphatic (meth) acrylic acid ester include a (meth) acrylate containing a linear or branched alkyl group having 4 or greater and 14 or less carbon atoms (more preferably not greater than 10 carbon atoms, and even more preferably not greater than 8 carbon atoms) . It is more preferable that the aliphatic (meth) acrylic acid ester include n-butyl (meth) acrylate and/or 2-ethylhexyl (meth) acrylate. It is preferable that the (meth) acrylate containing a linear or branched alkyl group having 4 or greater and 14 or less carbon atoms be an alkyl acrylate containing a linear or branched alkyl group having 4 or greater and 14 or less carbon atoms.
Particularly, in the case where the alkyl group is a branched alkyl group, the alkyl group may have 12 or greater and 20 or less carbon atoms. In the case of linear alkyl groups, if the number of carbon atoms is high (12 or greater, for example) , crystallinity develops, which makes it difficult for pressure-sensitive adhesiveness to be exhibited. However, in the case of branched alkyl groups, development of crystallinity can be inhibited even when the number of carbon atoms is high.
Furthermore, it is preferable that the (meth) acrylic acid ester (a2) include an alkyl (meth) acrylate containing an alkyl group having 1 or greater and 3 or less carbon atoms (more preferably, not greater than 2 carbon atoms) . It is more preferable that the (meth) acrylic acid ester (a2) include methyl (meth) acrylate. It is preferable that the (meth) acrylate containing an alkyl group having 1 or greater and 3 or less carbon atoms be an alkyl methacrylate.
The content of the alkyl (meth) acrylate containing an alkyl group having 1 or greater and 3 or less carbon atoms is preferably 1 part by mass or greater and more preferably 2 parts by mass or greater and is preferably 50 parts by mass or less and more preferably 40 parts by mass or less, per 100 parts by mass of the (meth) acrylate (a2) containing  an alkyl group having 4 or greater and 14 or less carbon atoms.
The percentage content of the (meth) acrylic acid ester (a2) is preferably 50 mass%or greater, more preferably 70 mass%or greater, and even more preferably 90 mass%or greater and is preferably 99 mass%or less and more preferably 98 mass%or less, based on the total amount of the mixture of monomers.
It is preferable that the monomers (mixture) further include a carboxyl-group-containing monomer (a3) .
The carboxy-group-containing monomer (a3) may be one or more carboxy-group-containing monomers, examples of which include unsaturated monocarboxylic acids, such as (meth) acrylic acid; (meth) acrylic esters of a monocarboxylic acid, such as β-carboxyethyl (meth) acrylate and 2- (meth) acryloyl propionic acid; unsaturated dicarboxylic acids, such as crotonic acid, itaconic acid, maleic acid, fumaric acid, phthalic acid, and succinic acid; (meth) acrylic half esters of the foregoing unsaturated dicarboxylic acids; anhydrides of the foregoing unsaturated dicarboxylic acids; and compounds of the foregoing unsaturated dicarboxylic acids in each of which a  (meth) acryloxyalkyl group (preferably, (meth) acryloxyethyl group) is attached to at least one of the carboxy groups. In particular, unsaturated monocarboxylic acids are preferable, and acrylic acid is particularly preferable.
The content of the carboxy-group-containing monomer (a3) is preferably 0.01 parts by mass or greater and more preferably 0.05 parts by mass or greater and is preferably 10 parts by mass or less, more preferably 5 parts by mass or less, and even more preferably 1 part by mass or less, per 100 parts by mass of the monomers (mixture) .
The monomers (mixture) may include one or more additional monomers (a4) , which are different from the hydroxyl group-containing monomer (a1) , the (meth) acrylic acid ester (a2) , and the carboxyl-group-containing monomer (a3) . Examples of the one or more additional monomers (a4) include nitrogen-functional-group-containing monomers, keto-group-containing monomers, silyl-group-containing monomers, and phosphate-group-containing monomers.
The nitrogen functional group is a functional group containing a nitrogen atom. Examples of the nitrogen-functional-group-containing monomer include cyclic amides, such as N-vinylpyrrolidone, N-vinylpiperidone, N- vinylmorpholinone, N-vinylcaprolactam, N-cyclohexylmaleimide, N-butyl maleimide, N-phenylmaleimide, N- (meth) acryloylmorpholine, N- (meth) acryloylpyrrolidone, N- (meth) acryloylpiperidine, N- (meth) acryloylpyrrolidine, and N- (meth) acryloyl-4-piperidone; substituted (meth) acrylamides, such as (meth) acrylonitrile, (meth) acrylamide, N, N-dimethyl (meth) acrylamide, N, N-diethyl (meth) acrylamide, N-methylol (meth) acrylamide, N-methoxymethyl (meth) acrylamide, N-butoxymethyl (meth) acrylamide, N, N-methylenebis (meth) acrylamide, N-isopropyl (meth) acrylamide, N, N-dimethylaminopropyl (meth) acrylamide, and dimethylaminopropyl (meth) acrylamide; and amino-group-containing (meth) acrylates, such as dimethylaminoethyl (meth) acrylate, dimethylaminopropyl (meth) acrylate, diethylaminoethyl (meth) acrylate, and t-butylaminoethyl (meth) acrylate.
Examples of the keto-group-containing monomer include diacetone (meth) acrylamide.
Examples of the silyl-group-containing monomer include 3- (meth) acryloxypropyl trimethoxysilane and 3- (meth) acryloxypropyl methyldimethoxysilane.
Examples of the phosphate-group-containing monomer include phosphate esters of polyethylene glycol mono (meth) acrylate (e.g., SIPOMER PAM-100, manufactured by Rhodia Nicca Ltd. ) .
The percentage content of the one or more additional monomers (a4) is preferably 20 mass%or less, more preferably 10 mass%or less, even more preferably 5 mass%or less, still more preferably 1 mass%or less, still even more preferably 0.1 mass%or less, and particularly preferably 0 mass%, based on the total amount of the mixture of monomers.
The acrylic resin (A) may be produced by polymerizing the mixture of monomers. Examples of the method for polymerization include radical polymerization methods, anionic polymerization methods, and cationic polymerization methods. Radical polymerization methods are preferable. Specifically, the radical polymerization method may be a method in which the mixture of monomers, a polymerization initiator, and an optionally used organic solvent are mixed together and stirred to promote the polymerization reaction.
The polymerization initiator may be one or more polymerization initiators, examples of which include peroxide initiators and azo initiators.
Examples of the peroxide initiator include dilauroyl peroxide, 1, 1, 3, 3-tetramethylbutyl peroxy-2-ethylhexanoate, disuccinic acid peroxide, 2, 5-dimethyl-2, 5-di (2-ethyl hexanoyl peroxy) hexane, t-butyl peroxyisobutyrate, t-butyl peroxy-2-ethylhexanoate, t-amyl peroxyisobutyrate, t-amyl peroxy-2-ethylhexanoate, t-hexyl peroxy-2-ethylhexanoate, t-hexyl peroxypivalate, di (3-methylbenzoyl) peroxide, benzoyl (3-methylbenzoyl) peroxide, and dibenzoyl peroxide.
Examples of the azo initiator include 2, 2′-azobis (4-methoxy-2, 4-dimethylvaleronitrile) , 2, 2′-azobis (2, 4-dimethylvaleronitrile) , 2, 2′-azobis (isobutyronitrile) , 2, 2′-azobis (2-methylbutyronitrile) , and 1, 1′-azobis (cyclohexane-1-carbonitrile) .
In the polymerization, a chain transfer agent may coexist. Examples of the chain transfer agent include lauryl mercaptan, glycidyl mercaptan, mercapto acetic acid, 2-mercaptoethanol, thioglycolic acid, 2-ethylhexyl thioglycolate, α-pinene, β-pinene, terpinolene, and α-methylstyrene dimers. These chain transfer agents may be used alone or in a combination of two or more.
It is preferable that the polymerization temperature be  20℃ or higher and i00℃ or lower. Particularly, in the case where a thermal decomposition initiator such as an azo initiator or a persulfate initiator is used, in the case of a thermal decomposition initiator, regarding the polymerization temperature, selecting a thermal decomposition initiator having a 10-hour half-life temperature that is within the reaction temperature or near the reaction temperature makes it easy to control the reaction, so that the amount of residual undecomposed initiator at the end of the reaction can be reduced.
The weight average molecular weight of the obtained acrylic resin (A) is preferably 100,000 or greater, more preferably 300,000 or greater, and even more preferably 500,000 or greater and is preferably 2,000,000 or less and more preferably 1,000,000 or less, from the standpoint of adhesion.
In this specification, the weight average molecular weight can be determined by gel permeation chromatography (GPC) by using polystyrene standards.
In emulsion polymerization, compared with solvent polymerization, branched structures due to hydrogen abstraction tends to form, and branching tends to occur, in  the production of an acrylic resin. In some cases, depending on the degree of branching and the type of column selected for GPC measurement, the molecular weight cannot be accurately measured. In such a case, GPC molecular weight measurements show a shoulder on the high-molecular-weight side. It is preferable that the weight average molecular weight of the acrylic resin be within the above-mentioned molecular weight ranges and have a single symmetrical peak in a GPC measurement.
The curing agent (B) includes a multifunctional isocyanate compound. The multifunctional isocyanate compound may be one or more multifunctional isocyanate compounds, examples of which include polyisocyanates, such as tolylene diisocyanate, chlorophenylene diisocyanate, hexamethylene diisocyanate, tetramethylene diisocyanate, xylylene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, and hydrogenated diphenylmethane diisocyanate; trimethylolpropane adducts thereof; isocyanurates thereof; biurets thereof; adducts thereof; and polymethylene polyphenyl polyisocyanates.
The content of the multifunctional isocyanate compound is 1 part by mass or greater and preferably 2 parts by mass or greater and is preferably 10 parts by mass or less, more  preferably 7 parts by mass or less, and even more preferably 5 parts by mass or less, per 100 parts by mass of the acrylic resin (A) .
The percentage content of the multifunctional isocyanate compound, in the curing agent (B) , is preferably 50 mass%or greater, more preferably 70 mass%or greater, and even more preferably 80 mass%or greater and is preferably 100 mass%or less.
It is preferable that the curing agent (B) further include at least one selected from the group consisting of metal chelate curing agents and epoxy crosslinking agents.
The metal chelate curing agent may be one or more metal chelate curing agents, examples of which include compounds including a metal and chelating agents coordinated thereto. The metal may be one or more metals, examples of which include multivalent metals, such as aluminum, iron, copper, zinc, tin, titanium, nickel, antimony, magnesium, vanadium, chromium, and zirconium. In particular, aluminum, titanium, zirconium, and the like are preferable.
The chelating agent may be one or more chelating agents, examples of which include β-dicarbonyl compounds and  carbonyl compounds containing a hydroxyl group or an amino group in the β position. Examples of the β-dicarbonyl compound include β-diketone compounds, such as acetyl acetone, 2, 4-hexanedione, 2, 4-heptanedione, 3, 5-heptanedione, 2, 4-octanedione, 3, 5-octanedione, 2, 4-nonanedione, 3, 5-nonanedione, and 5-methyl-2, 4-hexanedione; β-keto ester compounds, such as methyl acetoacetate, ethyl acetoacetate, propyl acetoacetate, isopropyl acetoacetate, butyl acetoacetate, isobutyl acetoacetate, s-butyl acetoacetate, t-butyl acetoacetate, 2-ethylhexyl acetoacetate, and dodecyl acetoacetate (preferably, acetoacetic acid alkyl esters having 1 to 20 carbon atoms) ; and β-diester compounds, such as diethyl malonate. Examples of the carbonyl compound containing a hydroxyl group or an amino group in the βposition include diacetone alcohol, diacetone amine, salicylaldehyde, methyl salicylate, and N-methyl salicylamide. In particular, β-dicarbonyl compounds are preferable, and β-diketone compounds are preferable.
It is preferable that the metal chelate curing agent be a compound in which a β-dicarbonyl compound (preferably, β-diketone compound) is coordinated to aluminum, titanium, zirconium, or the like.
In the case where the metal chelate curing agent is  included, the content of the metal chelate curing agent is preferably 0.1 parts by mass or greater, more preferably 0.5 parts by mass or greater, and even more preferably 1 part by mass or greater and is preferably 10 parts by mass or less, more preferably 7 parts by mass or less, and even more preferably 5 parts by mass or less, per 100 parts by mass of the multifunctional isocyanate compound.
The epoxy curing agent may be one or more epoxy curing agents, examples of which include bisphenol A epichlorohydrin-type epoxy resins, ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, glycerol diglycidyl ether, glycerol triglycidyl ether, 1, 6-hexanediol diglycidyl ether, trimethylolpropane triglycidyl ether, sorbitol polyglycidyl ether, polyglycerol polyglycidyl ether, pentaerythritol polyglycidyl erythritol, diglycerol polyglycidyl ether, 1, 3-bis (N, N-diglycidylaminomethyl) cyclohexane, and N, N, N′, N′-tetraglycidyl-m-xylene diamine.
In the case where the epoxy curing agent is included, the content of the epoxy curing agent is preferably 0.1 parts by mass or greater, more preferably 0.5 parts by mass or greater, and even more preferably 1 part by mass or greater and is preferably 10 parts by mass or less, more  preferably 7 parts by mass or less, and even more preferably 5 parts by mass or less, per 100 parts by mass of the multifunctional isocyanate compound.
The curing agent (B) may include an additional curing agent, which is different from the multifunctional isocyanate compound, the metal chelate curing agent, and the epoxy crosslinking agent. The additional curing agent may be one or more additional curing agents, examples of which include multivalent metal salt curing agents, keto-hydrazide curing agents, oxazoline curing agents, silane curing agents, aziridine curing agents, melamine curing agents, and aldehyde curing agents. The content of the additional curing agent is preferably 10 mass%or less, more preferably 5 mass%or less, and even more preferably 1 mass%or less, based on the total amount of the curing agent (B) .
The content of the curing agent (B) is preferably 1 part by mass or greater and more preferably 1.5 parts by mass or greater and is preferably 10 parts by mass or less, more preferably 8 parts by mass or less, and even more preferably 6 parts by mass or less, per 100 parts by mass of the acrylic resin (A) .
The fluorinated additive (C) may be preferably a  fluorosurfactant, more preferably a surfactant in which fluorinated hydrocarbon groups are included as hydrophobic groups, and even more preferably a fluorinated-hydrocarbon-group-containing anionic surfactant, a fluorinated-hydrocarbon-group-containing nonionic surfactant, a fluorinated-hydrocarbon-group-containing amphoteric surfactant, or the like. It is preferable that the fluorinated hydrocarbon group be a fluoroalkyl group having 1 to 10 carbon atoms or a fluoroalkenyl group having 1 to 10 carbon atoms.
The fluorinated-hydrocarbon-group-containing anionic surfactant may be one or more fluorinated-hydrocarbon-group-containing anionic surfactants, examples of which include fluorinated-hydrocarbon-group-and hydroxyl-group-containing anionic surfactants, fluorinated-hydrocarbon-group-and carboxyl-group-containing anionic surfactants, and fluorinated-hydrocarbon-group-and sulfonic-acid-group-containing surfactants.
The fluorinated-hydrocarbon-group-containing nonionic surfactant may be one or more fluorinated-hydrocarbon-group-containing nonionic surfactants, examples of which include alkylene oxide (preferably, ethylene oxide) adducts and/or alkylene sulfide adducts of a fluorinated hydrocarbon and  alkyl ethers of alkylene oxide (preferably, ethylene oxide) adducts and/or alkylene sulfide adducts of a fluorinated hydrocarbon.
The fluorinated additive (C) may be an organosilyl-group-and/or dialkylsiloxane-chain-containing additive.
The content of the fluorinated additive (C) is preferably 0.01 parts by mass or greater and more preferably 0.03 parts by mass or greater and is preferably 6 parts by mass or less, more preferably 3 parts by mass or less, and even more preferably 2 parts by mass or less, per 100 parts by mass of the acrylic resin (A) .
It is preferable that the pressure-sensitive adhesive composition of the present invention further include an antioxidant (D) . Examples of the antioxidant (D) include radical-scavenging primary antioxidants, such as phenolic antioxidants and amine-based antioxidants; and peroxide-decomposing secondary antioxidants, such as phosphorus-based antioxidants and sulfur-based antioxidants.
Examples of the phenolic antioxidant include triethylene glycol-bis- [3- (3-t-butyl-5-methyl-4-hydroxyphenyl) propionate] , pentaerythritol tetrakis [3- (3, 5- di-tert-butyl-4-hydroxyphenyl) propionate, octadecyl [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, thiodiethylene bis [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate] , benzenepropanoic acid-3, 5-bis (1, 1-dimethylethyl) -4-hydroxy-C 7-C 9-side-chain-alkyl ester, 4, 6-bis (dodecylthiomethyl) -o-cresol, reaction products of N-phenyl benzenamine and 2, 4, 4-trimethylpentene, 2-t-butyl-6- (3-t-butyl-2-hydroxy-5-methylbenzyl) -4-methylphenyl acrylate, 3, 9-bis [2- [3- (t-butyl-4-hydroxy-5-methylphenyl) propionyloxy] -1, 1-dimethylethyl] -2, 4, 8, 10-tetraoxaspiro [5.5] undecane, 2, 6-di-tert-butyl-4-methylphenol, 2, 2′-methylenebis (4-methyl-6-tert-butylphenol) , and 2, 5-di-tert-amyl-hydroquinone.
Examples of the amine-based antioxidant include bis (2, 2, 6, 6-tetramethyl-4-piperidyl) sebacate, bis (1, 2, 2, 6, 6-pentamethyl-4-piperidyl) sebacate, 1, 2, 3, 4-tetrakis (2, 2, 6, 6-tetramethyl-4-piperidyloxycarbonyl) butane, a polycondensate of dimethyl succinate and 1- (2-hydroxyethyl) -4-hydroxy-2, 2, 6, 6-tetramethylpiperidine, 1- (3, 5-di-t-butyl-4-hydroxyphenyl) -1, 1-bis (2, 2, 6, 6-tetramethyl-4-piperidyloxycarbonyl) pentane, N, N-bis (3-aminopropyl) ethylenediamine, 4-benzoyloxy-2, 2, 6, 6-tetramethylpiperidine, bis (octylon-2, 2, 6, 6-tetramethyl-4-piperidyl) sebacate, and bis (1, 2, 2, 6, 6-pentamethyl-4-piperidyl)  [ [3, 5-bis (1, 1-dimethylethyl) -4-hydroxyphenyl] methyl] butyl malonate.
Examples of the phosphorus-based antioxidant include triphenylphosphine, bis (2, 4-di-tert-butyl-6-methylphenyl) ethyl phosphite, triphenyl phosphite, trisnonylphenyl phosphite, tris (2, 4-dibutylphenyl) phosphite, tris (2, 4-dibutyl-5-methylphenyl) phosphite, tris [2-tert-butyl-4- (3-butyl-4-hydroxy-5-methylphenylthio) -5-methylphenyl] phosphite, tris (2, 4-di-tert-butylphenyl) phosphite, tridecyl phosphite, octyl diphenyl phosphite, di (decyl) monophenyl phosphite, di (tridecyl) pentaerythritol diphosphite, di(nonylphenyl) pentaerythritol diphosphite, bis (2, 4-dibutylphenyl) pentaerythritol diphosphite, bis (2, 6-dibutyl-4-methylphenyl) pentaerythritol diphosphite, bis (2, 4, 6-tributylphenyl) pentaerythritol diphosphite, bis (2, 4-dicumylphenyl) pentaerythritol diphosphite, tetra (tridecyl) isopropylidene diphenol diphosphite, tetra (tridecyl) -4, 4′-n-butylidenebis (2-butyl-5-methylphenol) diphosphite, hexa (tridecyl) -1, 1, 3-tris (2-methyl-4-hydroxy-5-butylphenyl) butane triphosphite, tetrakis (2, 4-dibutylphenyl) biphenylene diphosphonite, 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, 2, 2′-methylenebis (4, 6-butylphenyl) -2-ethylhexyl phosphite, 2, 2′- methylenebis (4, 6-butylphenyl) -octadecyl phosphite, 2, 2′-ethylidene bis (4, 6-dibutylphenyl) fluorophosphite, tris (2- [ (2, 4, 8, 10-tetrakisbutyldibenzo [d, f] [1, 3, 2] dioxaphosphepin-6-yl) oxy] ethyl) amine, and a phosphite of 2-ethyl-2-butyl propylene glycol and 2, 4, 6-tributylphenol.
Examples of the sulfur-based antioxidant include didodecyl-3, 3′-thiopropionate, dilauryl-3, 3′-thiodipropionate, dilauryl thiodipropionate, ditridecyl-3, 3′-thiodipropionate, dimyristyl-3, 3′-thiodipropionate, distearyl-3, 3′-thiodipropionate, tetrakis-methylene-3-laurylthiopropionate methane, distearyl-3, 3′-methyl-3, 3′-thiodipropionate, lauryl stearyl-3, 3′-thiodipropionate, bis [2-methyl-4- (3-n-alkylthiopropionyloxy) -5-t-butylphenyl] sulfide, β-lauryl thiopropionate, 2-mercaptobenzimidazole, 2-mercapto-5-methylbenzimidazole, and dioctadecyl-3, 3′-thiodipropionate.
In particular, the antioxidant (D) is preferably a primary antioxidant and more preferably a phenolic antioxidant. The content of the primary antioxidant (preferably, phenolic antioxidant) , in the antioxidant (D) , is preferably 80 mass%or greater and more preferably 90 mass%or greater and is 100 mass%or less.
In the case where the antioxidant (D) is included, the content of the antioxidant (D) is preferably 0.01 parts by mass or greater and more preferably 0.03 parts by mass or greater and is preferably 2 parts by mass or less, more preferably 1 part by mass or less, and even more preferably 0.5 parts by mass or less, per 100 parts by mass of the acrylic resin (A) .
The pressure-sensitive adhesive composition of the present invention may further include a solvent (E) . The solvent (E) may be one or more solvents and is preferably a solvent that does not interfere with the reaction with the isocyanate-based crosslinking agent. Examples of the solvent (E) include aromatic hydrocarbon solvents, such as toluene, o-xylene, m-xylene, and p-xylene; ester solvents, such as methyl acetate, ethyl acetate, and butyl acetate; ketone solvents, such as methyl ethyl ketone, methyl isobutyl ketone, acetone, cyclohexanone, and 3-pentanone; and hydrocarbon solvents, such as hexane and heptane, cyclohexane, and methylcyclohexane.
The content of the solvent (E) is preferably 10 parts by mass or greater and is preferably 2,000 parts by mass or less, per 100 parts by mass of the acrylic polymer (A) .
The pressure-sensitive adhesive composition of the present invention may further include one or more additional additives, examples of which include tackifying resins, colorants such as pigments and dyes, plasticizers, softeners, antioxidants, fillers, film-forming agents, leveling agents, wetting agents, thickeners (viscosity modifiers) , water repellents, and antifoaming agents. In the case where the resin composition includes the one or more additional additives, it is preferable that the content of the one or more additional additives be greater than 0 parts by mass and 30 parts by mass or less, per 100 parts by mass of the acrylic resin (A) .
Pressure-sensitive adhesive layers formed from the pressure-sensitive adhesive composition of the present invention and pressure-sensitive adhesive films or sheets including such a pressure-sensitive adhesive layer are also encompassed in the technical scope of the present invention. The pressure-sensitive adhesive film or sheet is preferably one that includes a substrate layer and a pressure-sensitive adhesive layer formed from the pressure-sensitive adhesive composition of the present invention and is more preferably one that includes a substrate layer, such a pressure-sensitive adhesive layer, and a release film layer (preferably, layered in this order) .
The substrate layer is preferably a layer of a plastic substrate and may be in the form of a sheet or film. Examples of the plastic include polyesters, such as polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate; polyolefins; poly (meth) acrylates; polyvinyl chlorides; polyethylenes; polypropylene/ethylene vinyl alcohols; polyurethanes, polyamides, and polyimides. The surface of the substrate layer may be, for example, a release-treated, antistatic-treated, and/or corona-treated surface. It is preferable that the substrate layer have a thickness of 2 μm or greater and 200 μm or less.
The method for producing the pressure-sensitive adhesive film or sheet may be, for example, a method in which the pressure-sensitive adhesive composition is coated onto a plastic substrate and then dried and cured to obtain a pressure-sensitive adhesive layer, and as necessary, a release film is laminated onto the pressure-sensitive adhesive layer.
When the resin composition, the pressure-sensitive adhesive composition, and the pressure-sensitive adhesive sheet of the present invention are used in a surface  protective film, it is possible to inhibit adherend objects from being contaminated by the surface protective film even in a case where the adherend objects are placed in a high-temperature and high-humidity environment. Hence, the resin composition, the pressure-sensitive adhesive composition, and the pressure-sensitive adhesive sheet of the present invention are suitable for use in a variety of industrial applications, such as automobiles, electronic devices, and home appliances, and are particularly useful for a surface protective film used when forming glass articles that are to be used in electronic devices (e.g., portable electronic terminal devices and PC tablets) .
EXAMPLES
The present invention will now be described in more detail with reference to examples.
[Synthesis Example 1]
Into a reaction vessel equipped with a stirrer, a reflux condenser, a nitrogen inlet tube, and a thermometer, 692 parts by mass of 2-ethylhexyl acrylate, 250 parts by mass of methyl acrylate, 56 parts by mass of 4-hydroxybutyl acrylate, 2.0 parts by mass of acrylic acid, and 1330 parts by mass of ethyl acetate were placed, and, under stirring, the temperature was increased to 70℃ while nitrogen was  injected. Subsequently, 20 parts by mass (5 mass%on a solids basis) of a solution of azobisisobutyronitrile, dissolved in advance in ethyl acetate, were added. Subsequently, the resultant was held at 72℃ for 8 hours under stirring, and thereafter, 980 parts by mass of ethyl acetate were added, and the contents were cooled and then filtered through a 200-mesh wire sieve. An acrylic polymer (A-1) solution having a non-volatile content of 29.9 mass%and a viscosity of 10, 600 mPa·swas obtained.
[Synthesis Example 2]
Into a reaction vessel equipped with a stirrer, a reflux condenser, a nitrogen inlet tube, and a thermometer, 785 parts by mass of 2-ethylhexyl acrylate, 145 parts by mass of methoxypolyethylene glycol #400 acrylate (NK ester AM-90G, manufactured by Shin-Nakamura Chemical Co., Ltd. ) , 70 parts by mass of 2-hydroxyethyl acrylate, and 1200 parts by mass of ethyl acetate were placed, and, under stirring, the temperature was increased to 70℃ while nitrogen was injected. Subsequently, 20 parts by mass (5 mass%on a solids basis) of a solution of azobisisobutyronitrile, dissolved in advance in ethyl acetate, were added. Subsequently, the resultant was held at 72℃ for 8 hours under stirring, and thereafter, 280 parts by mass of ethyl acetate were added, and the contents were cooled and then  filtered through a 200-mesh wire sieve. An acrylic polymer (A-2) solution having a non-volatile content of 40.0 mass%and a viscosity of 1300 mPa·swas obtained.
[Synthesis Example 3]
Into a reaction vessel equipped with a stirrer, a reflux condenser, a nitrogen inlet tube, and a thermometer, 898 parts by mass of 2-ethylhexyl acrylate, 2.0 parts by mass of acrylic acid, 100 parts by mass of 4-hydroxybutyl acrylate, 730 parts by mass of ethyl acetate, and 250 parts by mass of methyl ethyl ketone were placed, and, under stirring, the temperature was increased to 70℃ while nitrogen was injected. Subsequently, 20 parts by mass (5 mass%on a solids basis) of a solution of azobisisobutyronitrile, dissolved in advance in ethyl acetate, were added. Subsequently, the resultant was held at 72℃ for 8 hours under stirring, and thereafter, 220 parts by mass of ethyl acetate were added, and the contents were cooled and then filtered through a 200-mesh wire sieve. An acrylic polymer (A-3) solution having a non-volatile content of 45.0 mass%and a viscosity of 1900 mPa·swas obtained.
[Example 1]
To 100 parts by mass of the acrylic polymer (A-1) of  Synthesis Example 1, 0.1 parts by mass of Irganox 1010 manufactured by BASF SE, which is an antioxidant, were added. To the resultant, 1.5 parts by mass of Megaface F-562 manufactured by DIC Corporation, which is a fluorinated additive, and 2.0 parts by mass of Duranate TKA-100, which is a crosslinking agent manufactured by Asahi Kasei Chemicals Corporation, were added immediately prior to production of a pressure-sensitive adhesive film. Thus, a pressure-sensitive adhesive (1) was prepared.
[Example 2]
To 100 parts by mass of the acrylic polymer (A-1) of Synthesis Example 1, 0.1 parts by mass of Megaface F-562 manufactured by DIC Corporation, which is a fluorinated additive, 3.0 parts by mass of Duranate TKA-100, which is a crosslinking agent manufactured by Asahi Kasei Chemicals Corporation, and 0.05 parts by mass of aluminum tris (acetylacetonate) were added immediately prior to production of a pressure-sensitive adhesive film. Thus, a pressure-sensitive adhesive (2) was prepared.
[Example 3]
To 100 parts by mass of the acrylic polymer (A-1) of Synthesis Example 1, 0.1 parts by mass of Irganox 1010 manufactured by BASF SE, which is an antioxidant, were added.  To the resultant, 0.2 parts by mass of Megaface F-562 manufactured by DIC Corporation, which is a fluorinated additive, 2.5 parts by mass of Duranate TSS-100, which is a crosslinking agent manufactured by Asahi Kasei Chemicals Corporation, and 0.1 parts by mass of aluminum tris (acetylacetonate) were added immediately prior to production of a pressure-sensitive adhesive film. Thus, a pressure-sensitive adhesive (3) was prepared.
[Example 4]
To 100 parts by mass of the acrylic polymer (A-1) of Synthesis Example 1, 0.1 parts by mass of Irganox 1010 manufactured by BASF SE, which is an antioxidant, were added. To the resultant, 0.1 parts by mass of Megaface F-562 manufactured by DIC Corporation, which is a fluorinated additive, 3.5 parts by mass of BURNOCK D-750, which is a crosslinking agent manufactured by DIC Corporation, and 0.1 parts by mass of aluminum tris (acetylacetonate) were added immediately prior to production of a pressure-sensitive adhesive film. Thus, a pressure-sensitive adhesive (4) was prepared.
[Example 5]
To 100 parts by mass of the acrylic polymer (A-1) of Synthesis Example 1, 0.1 parts by mass of Irganox 1010  manufactured by BASF SE, which is an antioxidant, were added. To the resultant, 0.2 parts by mass of Megaface F-562 manufactured by DIC Corporation, which is a fluorinated additive, 2.0 parts by mass of Duranate TKA-100, which is a crosslinking agent manufactured by Asahi Kasei Chemicals Corporation, and 0.05 parts by mass of TETRAD-X, manufactured by MITSUBISHI GAS CHEMICAL COMPANY, INC., were added immediately prior to production of a pressure-sensitive adhesive film. Thus, a pressure-sensitive adhesive (5) was prepared.
[Example 6]
To 100 parts by mass of the acrylic polymer (A-2) of Synthesis Example 2, 0.05 parts by mass of Megaface F-562 manufactured by DIC Corporation, which is a fluorinated additive, 3.0 parts by mass of Duranate TKA-100, which is a crosslinking agent manufactured by Asahi Kasei Chemicals Corporation, and 0.1 parts by mass of aluminum tris (acetylacetonate) were added immediately prior to production of a pressure-sensitive adhesive film. Thus, a pressure-sensitive adhesive (6) was prepared.
[Example 7]
To 100 parts by mass of the acrylic polymer (A-3) of Synthesis Example 3, 0.1 parts by mass of Irganox 1010  manufactured by BASF SE, which is an antioxidant, were added. To the resultant, 0.2 parts by mass of Megaface F-562 manufactured by DIC Corporation, which is a fluorinated additive, 5.0 parts by mass of Duranate TKA-100, which is a crosslinking agent manufactured by Asahi Kasei Chemicals Corporation, and 0.1 parts by mass of aluminum tris (acetylacetonate) were added immediately prior to production of a pressure-sensitive adhesive film. Thus, a pressure-sensitive adhesive (7) was prepared.
[Comparative Example 1]
To 100 parts by mass of the acrylic polymer (A-1) of Synthesis Example 1, 3.0 parts by mass of Duranate TKA-100, which is a crosslinking agent manufactured by Asahi Kasei Chemicals Corporation, were added immediately prior to production of a pressure-sensitive adhesive film. Thus, a pressure-sensitive adhesive (X1) was prepared.
[Comparative Example 2]
To 100 parts by mass of the acrylic polymer (A-1) of Synthesis Example 1, 7 parts by mass of Megaface F-562 manufactured by DIC Corporation, 4.0 parts by mass of BURNOCK D-750, manufactured by DIC Corporation were added immediately prior to production of a pressure-sensitive adhesive film. Thus, a pressure-sensitive adhesive (X2) was  prepared.
[Comparative Example 3]
To 100 parts by mass of the acrylic polymer (A-1) of Synthesis Example 1, 0.3 parts by mass of KS-7002, manufactured by Shin-Etsu Chemical Co., Ltd. and 4 parts by mass of Duranate TSS-100, manufactured by Asahi Kasei Chemicals Corporation were added immediately prior to production of a pressure-sensitive adhesive film. Thus, a pressure-sensitive adhesive (X3) was prepared.
[Method for forming pressure-sensitive adhesive film]
Each of the pressure-sensitive adhesives (1) to (7) and (X1) to (X3) , being mixed with a crosslinking agent, was coated onto the surface of a polyethylene terephthalate (PET) film 6 μm in thickness in a manner such that the dried film thickness of the pressure-sensitive adhesive was 6 μm and then dried at 80℃ for 3 minutes. A PET film having a thickness of 38 μm and a release-treated surface was laminated onto the resultant and then cured at 40℃ for 3 days to obtain a test piece.
[Method for checking contamination status of adherend object after high-temperature testing]
The test piece prepared using the above-described  method was applied to both sides of a glass sheet. The resultant was subjected to heat treatment at 200℃ for 1 hour, at room temperature for 30 minutes, at 100℃ for 1 hour, at room temperature for 30 minutes, and at 140℃ for 45 minutes and was then left standing in an environment of 23℃ for 30 minutes. The pressure-sensitive adhesive film was peeled away from the glass sheet, and LED light was radiated from below the glass sheet. A contamination status was checked on the basis of the following evaluation criteria.
<Evaluation criteria>
○: Glass sheet was free of contamination
△: It was observed that glass sheet was partially contaminated
×: Entire surface of glass sheet was contaminated
[Method for measuring adhesive strength]
A test piece was prepared by cutting the test piece prepared using the above-described method into a piece 25 mm in width. The test piece was applied to a glass sheet in a manner such that the adhesion area was 25 mm × 60 mm, by reciprocating a 2-kg roller twice. When 20 minutes had passed after the application, a 180-degree peel strength was measured in an atmosphere of 23℃ and 50%RH. This was taken as an initial adhesive strength.
[Table 1]
Figure PCTCN2019095402-appb-000001
[Table 2]
Figure PCTCN2019095402-appb-000002
In all of Examples 1 to 7, which are examples of the present invention, contamination (white haze and white spots) was inhibited. In contrast, Comparative Examples 1 and 3 are examples in which no fluorinated additive was included, and Comparative Example 2 is an example in which the fluorinated additive content was above the range specified by the present invention. In all of Comparative Examples 1 to 3, contamination resistance was unsatisfactory.

Claims (7)

  1. A pressure-sensitive adhesive composition comprising:
    an acrylic resin (A) ;
    a curing agent (B) ; and
    a fluorinated additive (C) , wherein
    the curing agent (B) includes a multifunctional isocyanate compound,
    the acrylic resin (A) comprises a hydroxyl-group-containing acrylic resin,
    a content of the multifunctional isocyanate compound is 1 part by mass or greater per 100 parts by mass of the acrylic resin (A) , and
    a content of the fluorinated additive (C) is 0.01 parts by mass or greater and 6 parts by mass or less per 100 parts by mass of the acrylic resin (A) .
  2. The pressure-sensitive adhesive composition according to Claim 1, wherein the curing agent (B) further includes at least one selected from the group consisting of metal chelate curing agents and epoxy curing agents.
  3. The pressure-sensitive adhesive composition according to Claim 2, wherein a total content of the at least one of the metal chelate curing agents and the epoxy curing agents  is 1 part by mass or greater and 5 parts by mass or less per 100 parts by mass of the multifunctional isocyanate compound.
  4. The pressure-sensitive adhesive composition according to any one of Claims 1 to 3, wherein
    the acrylic resin (A) comprises a copolymer of a mixture of monomers including a hydroxyl-group-containing monomer (a1) and a (meth) acrylic acid ester (a2) , and
    a percentage content of the hydroxyl-group-containing monomer (a1) in the mixture of monomers is 0.5 mass%or greater and 15 mass%or less.
  5. The pressure-sensitive adhesive composition according to any one of Claims 1 to 4, further comprising an antioxidant (D) .
  6. A pressure-sensitive adhesive film or sheet formed from the pressure-sensitive adhesive composition according to any one of Claims 1 to 5.
  7. A surface protective film comprising the film or sheet according to Claim 6.
PCT/CN2019/095402 2019-07-10 2019-07-10 Pressure-sensitive adhesive composition and surface protective film WO2021003695A1 (en)

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