WO2015118960A1 - Feuille adhésive sensible à la pression - Google Patents

Feuille adhésive sensible à la pression Download PDF

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Publication number
WO2015118960A1
WO2015118960A1 PCT/JP2015/051775 JP2015051775W WO2015118960A1 WO 2015118960 A1 WO2015118960 A1 WO 2015118960A1 JP 2015051775 W JP2015051775 W JP 2015051775W WO 2015118960 A1 WO2015118960 A1 WO 2015118960A1
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Prior art keywords
pressure
sensitive adhesive
adhesive layer
mass
layer
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PCT/JP2015/051775
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English (en)
Japanese (ja)
Inventor
西川　健一
理仁 丹羽
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日東電工株式会社
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Publication of WO2015118960A1 publication Critical patent/WO2015118960A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/16—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer formed of particles, e.g. chips, powder or granules
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/065—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of foam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/14—Layered products comprising a layer of synthetic resin next to a particulate layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C09J133/04—Homopolymers or copolymers of esters
    • C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C09J133/08—Homopolymers or copolymers of acrylic acid esters
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/22—Plastics; Metallised plastics
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2405/00—Adhesive articles, e.g. adhesive tapes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2419/00—Buildings or parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2605/00—Vehicles
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K7/00—Use of ingredients characterised by shape
    • C08K7/22—Expanded, porous or hollow particles
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
    • C09J2301/41—Additional features of adhesives in the form of films or foils characterized by the presence of essential components additives as essential feature of the carrier layer
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
    • C09J2301/412—Additional features of adhesives in the form of films or foils characterized by the presence of essential components presence of microspheres
    • 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
    • C09J2400/00—Presence of inorganic and organic materials
    • C09J2400/20—Presence of organic materials
    • C09J2400/24—Presence of a foam
    • C09J2400/243—Presence of a foam in the substrate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2433/00—Presence of (meth)acrylic polymer

Definitions

  • the present invention relates to an adhesive sheet.
  • Adhesive sheets are widely used in industry as simple and reliable means for fixing various members.
  • An adhesive sheet is produced using the adhesive which shows viscoelasticity at normal temperature, and various members are fixed by crimping
  • pressure-sensitive adhesive sheets that are excellent in flexibility and weather resistance and have strong adhesive strength have been developed, and such pressure-sensitive adhesive sheets are used for fixing home appliances, interior / exterior parts of automobiles, and building materials.
  • an adhesive sheet for example, those described in the following documents are known.
  • an object of this invention is to provide the adhesive sheet which has high adhesive force with respect to the various to-be-adhered bodies from which polarity differs.
  • the present inventor contains an acrylic polymer (a) as a base polymer and constitutes an adhesive surface (A) and the adhesive layer (A). And a structural unit derived from any one or more acidic group-containing monomers selected from the group consisting of a hydroxyl group-containing monomer and a carboxyl group-containing monomer.
  • a structural unit derived from at least one basic group-containing monomer selected from the group consisting of a heterocyclic ring-containing vinyl monomer and an amide group-containing monomer, and the thickness of the viscoelastic layer (B) is The pressure-sensitive adhesive sheet having a thickness of 200 ⁇ m or more was found to have a high adhesive force on a wide range of adherends having different polarities, and the present invention was completed.
  • the acrylic polymer (a) contains 50% by mass or more of a structural unit derived from a (meth) acrylic acid alkyl ester having a linear or branched alkyl group having 1 to 20 carbon atoms. But you can.
  • the acrylic polymer (a) preferably contains 2% by mass or more of a structural unit derived from a hydroxyl group-containing monomer and 10% by mass or more of a structural unit derived from a heterocyclic ring-containing vinyl monomer. .
  • the acrylic polymer (a) may include a structural unit derived from a polyfunctional monomer having two or more polymerizable functional groups.
  • the acrylic polymer (a) may contain 0.1% by mass or more of a structural unit derived from a carboxyl group-containing monomer.
  • the viscoelastic layer (B) may include hollow particles.
  • the viscoelastic layer (B) may contain bubbles.
  • the viscoelastic layer (B) may include an acrylic polymer (b) as a base polymer.
  • the acrylic polymer (b) contains 50% by mass or more of a structural unit derived from a (meth) acrylic acid alkyl ester having a linear or branched alkyl group having 1 to 20 carbon atoms. And 5 mass% or more of the structural unit derived from a carboxyl group-containing monomer may be included.
  • the pressure-sensitive adhesive sheet may include the pressure-sensitive adhesive layer (A) on both the front and back surfaces of the viscoelastic body layer (B).
  • the adhesive sheet which has high adhesive force can be provided with respect to the wide to-be-adhered body from which polarity differs.
  • FIG. 1 is a schematic cross-sectional view of an adhesive sheet according to an embodiment.
  • the pressure-sensitive adhesive sheet comprises a pressure-sensitive adhesive layer (A) constituting a pressure-sensitive adhesive surface and a viscoelastic body layer (B) that supports the pressure-sensitive adhesive layer (A).
  • adheresive sheet may be referred to by a name different from “adhesive tape”, “adhesive film”, etc., but in this specification, the expression is unified as “adhesive sheet”. Moreover, in this specification, the surface which touches a to-be-adhered body in an adhesive sheet is called "adhesion surface.”
  • the pressure-sensitive adhesive layer (A) is designed so as to be able to form a pressure-sensitive adhesive surface that exhibits high adhesive strength to adherends of various polarities, from adherends with high polarity to adherends with low polarity. It is an adhesive layer.
  • the “adherent having a high polarity” or the “adherent having a low polarity” specifically refers to an “adherent having a high surface energy” or “an adherend having a low surface energy”.
  • the surface energy of each adherend is a value inherent to the composition and chemical composition of the material, and is an important physical property value that affects the “wetability” of the adherend. ing. In general, it is known that those having a large surface energy value (large polarity) have good adhesion, and those having a small value (small polarity) have poor adhesion.
  • the surface energy can be obtained by measuring the contact angle of a droplet on each adherend surface.
  • a surface energy of a typical material for example, the following values can be used as a guide.
  • PC polycarbonate
  • ABS acrylonitrile butadiene styrene
  • PSt polystyrene
  • an adherend made of a material such as SUS having a surface energy of 200 ⁇ 10 ⁇ 3 N / m or more is referred to as an “adhesive with high polarity”, and the surface energy is 100 ⁇ 10 ⁇ 3 N / m.
  • An adherend made of materials such as PC, ABS, and PSt that are less than or equal to m is handled as an “adhesive with low polarity”.
  • the pressure-sensitive adhesive layer (A) is based on an acrylic polymer (a), and the acrylic polymer (a) is selected from the group consisting of a hydroxyl group-containing monomer and a carboxyl group-containing monomer. Derived from any one or more basic group-containing monomers selected from the group consisting of structural units derived from any one or more acidic group-containing monomers, and heterocyclic-containing vinyl monomers and amide group-containing monomers. Containing structural units.
  • the content (% by mass) of the acrylic polymer (a) in the pressure-sensitive adhesive layer (A) (100% by mass) is preferably 50% by mass or more, more preferably 60% by mass or more, and further preferably 75% by mass or more. .
  • the upper limit of the content (mass%) is not particularly limited, but is preferably 99.9% by mass or less, more preferably 99.8% by mass or less, and still more preferably 99.5% by mass or less.
  • the acrylic polymer (a) (100% by mass) is a structural unit derived from any one or more acidic group-containing monomers selected from the group consisting of a hydroxyl group-containing monomer and a carboxyl group-containing monomer, and a heterocyclic ring-containing vinyl system And a structural unit derived from any one or more basic group-containing monomers selected from the group consisting of monomers and amide group-containing monomers.
  • acidic group-containing monomer As the acidic group-containing monomer, one or more kinds selected from the group consisting of a hydroxyl group-containing monomer and a carboxyl group-containing monomer as described below can be used. The following can be used individually by 1 type or in combination of 2 or more types.
  • a hydroxyl group-containing monomer is preferably included, and it is more preferable to use one or more selected monomers for the hydroxyl group-containing monomer and the carboxyl group-containing monomer.
  • the structural unit derived from the acidic group-containing monomer is preferably contained in an amount of 2% by mass or more, more preferably 4% by mass or more, relative to the acrylic polymer (a) (100% by mass). Moreover, the structural unit derived from the acidic group-containing monomer is preferably contained in an amount of 15% by mass or less, more preferably 10% by mass or less, relative to the acrylic polymer (a) (100% by mass).
  • the structural unit derived from the hydroxyl group-containing monomer may be contained in an amount of preferably 3% by mass or more with respect to the acrylic polymer (a) (100% by mass). Moreover, the structural unit derived from the hydroxyl group-containing monomer is preferably contained in an amount of 5% by mass or less, more preferably 4% by mass or less, with respect to the acrylic polymer (a) (100% by mass).
  • hydroxyl group-containing monomer examples include 2-hydroxyethyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate, and vinyl alcohol. And allyl alcohol. These may be used alone or in combination of two or more. Among these, 2-hydroxyethyl acrylate (HEA) is preferable.
  • (meth) acryl means “acryl” and / or “methacryl” (any one or both of “acryl” and “methacryl”).
  • the structural unit derived from the carboxyl group-containing monomer is preferably contained in an amount of 0.1 mass or more, more preferably 0.5 mass% or more (for example, 1 mass) with respect to the acrylic polymer (a) (100 mass%). % Or more) may be included. Further, the structural unit derived from the carboxyl group-containing monomer is preferably contained in an amount of 10% by mass or less, more preferably 9% by mass or less, and still more preferably, based on the acrylic polymer (a) (100% by mass). 8 mass% or less may be contained.
  • carboxyl group-containing monomer examples include (meth) acrylic acid, itaconic acid, maleic acid, fumaric acid, crotonic acid, isocrotonic acid, and acid anhydrides thereof (for example, acid anhydrides such as maleic anhydride and itaconic anhydride). Containing monomer) and the like. These may be used alone or in combination of two or more. Among these, acrylic acid (AA) is preferable.
  • the structural unit derived from each monomer is an acrylic polymer (a) ( 100% by mass) is preferably contained in an amount of 0.5% by mass, more preferably 1% by mass or more.
  • acrylic polymer (a) 100% by mass
  • 2-hydroxyethyl acrylate and acrylic acid are used in combination, it is preferable that both of them are 1% by mass or more. More preferably, for example, 2-hydroxyethyl acrylate and acrylic acid may be 3% by mass or more and 1% by mass or more, respectively.
  • Basic group-containing monomer As a basic group containing monomer, 1 or more types can be selected from the group which consists of a heterocyclic containing monomer and an amide group containing monomer as follows.
  • the basic group-containing monomer preferably includes a heterocyclic ring-containing monomer.
  • the structural unit derived from the basic group-containing monomer is preferably contained in an amount of 10% by mass or more, more preferably 15% by mass or more, relative to the acrylic polymer (a) (100% by mass). preferable.
  • the structural unit derived from the basic group-containing monomer is preferably contained in an amount of 40% by mass or less, more preferably 30% by mass or less, based on the acrylic polymer (a) (100% by mass). .
  • the structural unit derived from the heterocyclic ring-containing vinyl monomer is preferably contained in an amount of 12% by mass or more, more preferably 15% by mass or more, based on the acrylic polymer (a) (100% by mass).
  • the structural unit derived from the heterocyclic ring-containing vinyl monomer is preferably contained in an amount of 30% by mass or less, more preferably 25% by mass or less, and more preferably 25% by mass or less, based on the acrylic polymer (a) (100% by mass). Preferably, it may be contained in an amount of 20% by mass or less.
  • heterocyclic ring-containing vinyl monomer examples include N-vinyl-2-pyrrolidone, (meth) acryloylmorpholine, N-vinyl piperidone, N-vinyl piperazine, N-vinyl pyrrole, N-vinyl imidazole and the like. These may be used alone or in combination of two or more. Among these, N-vinyl-2-pyrrolidone (NVP) is preferable.
  • the structural unit derived from the amide group-containing monomer is preferably contained in an amount of 0.1% by mass or more, more preferably 0.5% by mass or more, relative to the acrylic polymer (a) (100% by mass). Good.
  • the structural unit derived from the amide group-containing vinyl monomer is preferably contained in an amount of 30% by mass or less, more preferably 25% by mass or less, and more preferably 25% by mass or less, based on the acrylic polymer (a) (100% by mass). Preferably, it may be contained in an amount of 20% by mass or less.
  • amide group-containing monomers examples include (meth) acrylamide, N, N-dimethyl (meth) acrylamide, N-methylol (meth) acrylamide, N-methoxymethyl (meth) acrylamide, and N-butoxymethyl (meth) acrylamide. N-hydroxyethyl (meth) acrylamide and the like. These may be used alone or in combination of two or more.
  • acrylic polymer (a) contains 2 mass% or more of structural units derived from a hydroxyl group-containing monomer, and contains 10 mass% or more of structural units derived from a heterocyclic ring-containing vinyl monomer. . If the pressure-sensitive adhesive layer (A) includes the acrylic polymer (a) having such a configuration, it is possible to obtain a pressure-sensitive adhesive surface exhibiting high adhesive strength on a wide range of adherends having different polarities. It becomes easy.
  • the acrylic polymer (a) may be referred to as a (meth) acrylic acid alkyl ester having a linear or branched alkyl group having 1 to 20 carbon atoms (simply referred to as “(meth) acrylic acid alkyl ester”). 50% by mass or more is preferable.
  • the structural unit derived from the (meth) acrylic acid alkyl ester is more preferably contained in an amount of 60% by mass or more, more preferably 70% by mass or more, relative to the acrylic polymer (a) (100% by mass). Good. Moreover, the structural unit derived from the (meth) acrylic acid alkyl ester is preferably contained in an amount of 85% by mass or less, more preferably 80% by mass or less, with respect to the acrylic polymer (a) (100% by mass). Also good.
  • Examples of the (meth) acrylic acid alkyl ester include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, ( Isobutyl acrylate, s-butyl (meth) acrylate, t-butyl (meth) acrylate, pentyl (meth) acrylate, isopentyl (meth) acrylate, hexyl (meth) acrylate, (meth) acrylic acid Heptyl, octyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isooctyl (meth) acrylate, nonyl (meth) acrylate, isononyl (meth) acrylate, decyl (meth) acrylate, (meth) acrylic Iso
  • the (meth) acrylic acid alkyl ester is preferably a (meth) acrylic acid alkyl ester having an alkyl group having 1 to 14 carbon atoms, and an (meth) acrylic acid alkyl having an alkyl group having 1 to 8 carbon atoms.
  • Esters are more preferable, and n-butyl acrylate (BA), 2-ethylhexyl acrylate (2EHA), and the like are more preferable.
  • the acrylic polymer (a) may include a structural unit derived from a polyfunctional monomer having two or more polymerizable functional groups containing an unsaturated double bond (sometimes referred to as a polyfunctional monomer).
  • a polyfunctional monomer When the structural unit derived from a polyfunctional monomer is contained in the acrylic polymer (a), the acrylic polymer (a) contains a crosslinked acrylic polymer, and the pressure-sensitive adhesive layer (A ) Is improved in cohesiveness and adhesive strength.
  • the structural unit derived from the polyfunctional monomer is preferably contained in an amount of 0.01% by mass or more, more preferably 0.02% by mass or more, and still more preferably 0% with respect to the acrylic polymer (100% by mass). .05 mass% or more may be contained. Moreover, the structural unit derived from the polyfunctional monomer is preferably contained in an amount of 0.5% by mass or less, more preferably 0.3% by mass or less, with respect to the acrylic polymer (100% by mass). .
  • multifunctional monomer examples include hexanediol di (meth) acrylate, butanediol di (meth) acrylate, (poly) ethylene glycol di (meth) acrylate, (poly) propylene glycol di (meth) acrylate, and neopentyl glycol.
  • the polyfunctional monomer is preferably a polyfunctional (meth) acrylate such as 1,6-hexanediol diacrylate (HDDA).
  • the acrylic polymer (a) may contain a monomer other than the above-described monomer as a structural unit as long as the object of the present invention is not impaired.
  • monomers include (meth) acrylamide, N, N-dimethyl (meth) acrylamide, N-methylol (meth) acrylamide, N-methoxymethyl (meth) acrylamide, N-butoxymethyl (meth) acrylamide, Amide group-containing monomers such as N-hydroxyethyl (meth) acrylamide; Amino group-containing monomers such as aminoethyl (meth) acrylate, dimethylaminoethyl (meth) acrylate, and t-butylaminoethyl (meth) acrylate; Epoxy group-containing monomers such as glycidyl (meth) acrylate and methyl glycidyl (meth) acrylate; Cyano group-containing monomers such as acrylonitrile
  • the acrylic polymer (a) can be prepared by using a known or conventional polymerization method.
  • the polymerization method include a solution polymerization method, an emulsion polymerization method, a bulk polymerization method, and a photopolymerization method.
  • a curing reaction by heat or active energy rays (for example, ultraviolet rays) using a polymerization initiator such as a thermal polymerization initiator or a photopolymerization initiator.
  • a curing reaction using a photopolymerization initiator because it has advantages such as shortening the polymerization time.
  • a known or commonly used polymerization initiator can be used depending on the polymerization method, polymerization mode, and the like. Moreover, you may mix
  • thermal polymerization initiator examples include 2,2′-azobisisobutyronitrile, 2,2′-azobis-2-methylbutyronitrile, 2,2′-azobis (2-methylpropionic acid) dimethyl. 4,4′-azobis-4-cyanovaleric acid, azobisisovaleronitrile, 2,2′-azobis (2-amidinopropane) dihydrochloride, 2,2′-azobis [2- (5-methyl-2 -Imidazolin-2-yl) propane] dihydrochloride, 2,2'-azobis (2-methylpropionamidine) disulfate, 2,2'-azobis (N, N'-dimethyleneisobutylamidine) dihydrochloride, 2, Azo polymerization initiators such as 2,2′-azobis [N- (2-carboxyethyl) -2-methylpropionamidine] hydrate; Peroxide polymerization initiators such as benzoyl peroxide, t-butyl permaleate, lauroyl per
  • the amount of the thermal polymerization initiator used is not particularly limited as long as it can be conventionally used as a thermal polymerization initiator.
  • the thermal polymerization can be preferably carried out at a temperature of, for example, about 20 to 100 ° C. (typically 40 to 80 ° C.).
  • photopolymerization initiator examples include benzoin ether photopolymerization initiators, acetophenone photopolymerization initiators, ⁇ -ketol photopolymerization initiators, aromatic sulfonyl chloride photopolymerization initiators, and photoactive oxime photopolymerization initiators. Initiators, benzoin photopolymerization initiators, benzyl photopolymerization initiators, benzophenone photopolymerization initiators, ketal photopolymerization initiators, thioxanthone photopolymerization initiators, acylphosphine oxide photopolymerization initiators, and the like It is done.
  • benzoin ether photopolymerization initiator examples include benzoin methyl ether, benzoin ethyl ether, benzoin propyl ether, benzoin isopropyl ether, benzoin isobutyl ether, 2,2-dimethoxy-1,2-diphenylethane-1-one [ BASF, trade name: Irgacure 651], anisole methyl ether, and the like.
  • acetophenone photopolymerization initiator examples include 1-hydroxycyclohexyl phenyl ketone [manufactured by BASF, trade name: Irgacure 184], 4-phenoxydichloroacetophenone, 4-t-butyl-dichloroacetophenone, 1- [4- (2-hydroxyethoxy) -phenyl] -2-hydroxy-2-methyl-1-propan-1-one [manufactured by BASF, trade name: Irgacure 2959], 2-hydroxy-2-methyl-1-phenyl-propane -1-one [manufactured by BASF, trade name: Darocur 1173], methoxyacetophenone, and the like.
  • Examples of the ⁇ -ketol photopolymerization initiator include 2-methyl-2-hydroxypropiophenone, 1- [4- (2-hydroxyethyl) -phenyl] -2-hydroxy-2-methylpropane-1 -ON and the like.
  • Examples of the aromatic sulfonyl chloride photopolymerization initiator include 2-naphthalenesulfonyl chloride.
  • Examples of the photoactive oxime photopolymerization initiator include 1-phenyl-1,1-propanedione-2- (o-ethoxycarbonyl) -oxime.
  • Examples of the benzoin photopolymerization initiator include benzoin.
  • Examples of the benzyl photopolymerization initiator include benzyl.
  • benzophenone photopolymerization initiator examples include benzophenone, benzoylbenzoic acid, 3,3′-dimethyl-4-methoxybenzophenone, polyvinylbenzophenone, ⁇ -hydroxycyclohexyl phenyl ketone, and the like.
  • ketal photopolymerization initiator examples include benzyl dimethyl ketal.
  • thioxanthone photopolymerization initiator examples include thioxanthone, 2-chlorothioxanthone, 2-methylthioxanthone, 2,4-dimethylthioxanthone, isopropylthioxanthone, 2,4-dichlorothioxanthone, 2,4-diethylthioxanthone, isopropylthioxanthone. 2,4-diisopropylthioxanthone, dodecylthioxanthone and the like.
  • acylphosphine oxide photopolymerization initiator examples include bis (2,6-dimethoxybenzoyl) phenylphosphine oxide, bis (2,6-dimethoxybenzoyl) (2,4,4-trimethylpentyl) phosphine oxide, Bis (2,6-dimethoxybenzoyl) -n-butylphosphine oxide, bis (2,6-dimethoxybenzoyl)-(2-methylpropan-1-yl) phosphine oxide, bis (2,6-dimethoxybenzoyl)-( 1-methylpropan-1-yl) phosphine oxide, bis (2,6-dimethoxybenzoyl) -t-butylphosphine oxide, bis (2,6-dimethoxybenzoyl) cyclohexylphosphine oxide, bis (2,6-dimethoxybenzoyl) Octylphosphineoxy Bis (2-methoxybenzoyl) (2-
  • the initiator used for the polymerization of the acrylic polymer (a) is not particularly limited, but it is preferable to use a photopolymerization initiator because of the advantage that the polymerization time can be shortened.
  • the acrylic polymer (a) can be generated by irradiating the monomer composition containing the photopolymerization initiator with active energy rays (for example, ultraviolet rays) to polymerize the monomer.
  • the amount (lower limit) of the photopolymerization initiator is not particularly limited as long as the acrylic polymer (a) can be formed by a photopolymerization reaction. For example, it is used to form the acrylic polymer (a).
  • the amount is preferably 0.01 parts by mass or more, more preferably 0.03 parts by mass or more, and still more preferably 0.05 parts by mass or more with respect to 100 parts by mass of all the monomer components.
  • the usage-amount (upper limit) of a photoinitiator is similarly 5 mass parts or less, More preferably, it is 3 mass parts or less, More preferably, it is 2 mass parts or less.
  • the photopolymerization initiator When activating the photopolymerization initiator, it is important to irradiate the monomer composition containing the photopolymerization initiator with active energy rays.
  • active energy rays include ionizing radiation such as ⁇ rays, ⁇ rays, ⁇ rays, neutron rays, electron rays, and ultraviolet rays, and ultraviolet rays are particularly preferable.
  • the irradiation energy, irradiation time, irradiation method, and the like of the active energy ray are not particularly limited as long as the photopolymerization initiator can be activated to cause the monomer component to react.
  • the pressure-sensitive adhesive layer (A) may contain a filler as a component other than the acrylic polymer (a).
  • the filler may be appropriately blended in the pressure-sensitive adhesive layer (A) as necessary in order to improve various performances such as reinforcement, workability, handleability, and adhesion.
  • the filler is not particularly limited.
  • metals such as copper, nickel, aluminum, chromium, iron, and stainless steel; metal oxides such as alumina and zirconia; carbides such as silicon carbide, boron carbide, and nitrogen carbide Nitrides such as aluminum nitride, silicon nitride, boron nitride; inorganic materials such as calcium carbide, calcium carbonate, aluminum hydroxide, glass, silica; polystyrene, acrylic resin (eg, polymethyl methacrylate), phenol resin, benzoguanamine resin, urea Examples thereof include polymers such as resins, silicone resins, nylon, polyester, polyurethane, polyethylene, polypropylene, polyamide, polyimide, silicone, and vinylidene chloride.
  • natural raw material particles such as volcanic shirasu and sand may be used. These may be used alone or in combination of two or more.
  • the outer shape and shape of the filler are not particularly limited.
  • the outer shape of the filler may be, for example, a spherical shape, a flake shape, or an indefinite shape.
  • the structure of the filler can be, for example, a dense structure, a porous structure, a hollow structure, or the like. As the filler, it is preferable to use hollow particles.
  • hollow particles examples include inorganic hollow particles and organic hollow particles.
  • the inorganic hollow particles include glass hollow balloons such as hollow glass balloons, metal compound hollow balloons such as hollow alumina balloons, and porcelain hollow balloons such as hollow ceramic balloons.
  • Specific examples of organic hollow particles include resin hollow balloons such as hollow acrylic balloons and hollow vinylidene chloride balloons. The hollow particles may be used alone or in combination of two or more.
  • hollow glass balloons are particularly preferable from the viewpoints of polymerization efficiency by active energy rays (particularly ultraviolet rays) and weight. If a hollow glass balloon is used as the hollow particles, the adhesive performance of the pressure-sensitive adhesive layer can be improved without impairing other properties such as shearing force and holding force.
  • commercially available hollow glass balloons include, for example, trade names “Glass Micro Balloon”, “Fuji Balloon H-40”, “Fuji Balloon H-35” manufactured by Fuji Silysia Chemical Ltd., and trade names manufactured by Tokai Kogyo Co., Ltd.
  • the average particle diameter (lower limit) of the filler is not particularly limited, but is preferably 0.1 ⁇ m.
  • the average particle diameter (upper limit) is preferably 500 ⁇ m or less, more preferably 200 ⁇ m or less, and still more preferably 80 ⁇ m or less.
  • the specific gravity (true density) (lower limit) of the filler is not particularly limited, but is preferably 0.1 g / cm 3 or more, and more preferably 0.15 g / cm 3 .
  • the specific gravity (upper limit) is preferably 5.0 g / cm 3 or less, more preferably 3.0 g / cm 3 .
  • the specific gravity of the filler (especially hollow particles) is in such a range, it is incorporated into the composition for forming the pressure-sensitive adhesive layer (A) (hereinafter referred to as “pressure-sensitive adhesive layer-forming composition”). It is preferable that lifting during the process is suppressed and the composition is easily dispersed uniformly in the pressure-sensitive adhesive layer forming composition.
  • blended in an adhesive layer (A) is suitably 20 mass% or less of the whole adhesive layer (A), for example, and is 10 mass% or less. It is preferable that Moreover, the same usage-amount (lower limit) can be 1 mass% or more, for example.
  • the pressure-sensitive adhesive layer (A) may contain a colorant (pigment, dye, etc.) as long as the object of the present invention is not impaired.
  • the colorant can be blended into the pressure-sensitive adhesive layer (A) as necessary in order to impart optical properties (for example, light-shielding properties) and design properties.
  • the colorant is not particularly limited.
  • the pressure-sensitive adhesive layer (A) is formed by curing the pressure-sensitive adhesive layer-forming composition by a photopolymerization method, in order to color the pressure-sensitive adhesive layer (A).
  • a pigment (colored pigment) that does not exclude photopolymerization can be used as a colorant.
  • carbon black for example, acetylene black, ketjen black, furnace black, channel black, thermal black
  • the use amount (upper limit) of the colorant is, for example, suitably 10% by mass or less of the entire pressure-sensitive adhesive layer (A) in consideration of the degree of coloration, photopolymerization reactivity, etc., and 5% by mass. The following is preferable. Moreover, the same usage-amount (lower limit) can be 0.1 mass% or more, for example.
  • the pressure-sensitive adhesive layer (A) is a thermally expandable microsphere, a tackifier, a crosslinking agent (for example, an epoxy-based crosslinking agent, an isocyanate-based crosslinking agent, a silicone-based crosslinking agent, an oxazoline) unless the purpose of the present invention is impaired.
  • a crosslinking agent for example, an epoxy-based crosslinking agent, an isocyanate-based crosslinking agent, a silicone-based crosslinking agent, an oxazoline
  • Crosslinking agent aziridine crosslinking agent, silane crosslinking agent, alkyl etherified melamine crosslinking agent, metal chelate crosslinking agent), crosslinking accelerator, silane coupling agent, anti-aging agent, pigment, dye, UV absorber, Antioxidants, chain transfer agents, plasticizers, softeners, antistatic agents, solvents, polymers, adhesives (eg rubber adhesives, vinyl alkyl ether adhesives, silicone adhesives, polyester adhesives, polyamides) System adhesives, urethane adhesives, fluorine adhesives, epoxy adhesives) and the like. These may be used alone or in combination of two or more.
  • adhesives eg rubber adhesives, vinyl alkyl ether adhesives, silicone adhesives, polyester adhesives, polyamides
  • System adhesives urethane adhesives, fluorine adhesives, epoxy adhesives
  • the pressure-sensitive adhesive layer (A) preferably has a structure that does not substantially contain bubbles.
  • substantially does not contain bubbles means that the bubbles are not actively formed in the pressure-sensitive adhesive layer (A) except when inevitably mixed.
  • the bubble content in the pressure-sensitive adhesive layer (A) is ideally zero.
  • the bubble content in the actual pressure-sensitive adhesive layer (A) is preferably 3% by volume or less, more preferably 1% by volume, based on the total volume (100% by volume) of the pressure-sensitive adhesive layer (A). It is as follows.
  • the pressure-sensitive adhesive layer (A) used in the pressure-sensitive adhesive sheet of the present embodiment is formed using, for example, a pressure-sensitive adhesive layer forming composition.
  • the composition for forming an adhesive layer is not particularly limited as long as it can form the above-described adhesive layer (A) of the present invention, and can be appropriately selected depending on the purpose.
  • a monomer composition composed of each monomer component used for forming the acrylic polymer (a) and the monomer component are polymerized. It is preferable to use a curable adhesive layer forming composition containing a mixture of a polymerization initiator and other components added as necessary.
  • the pressure-sensitive adhesive layer forming composition is preferably a photocurable pressure-sensitive adhesive layer forming composition using a photopolymerization initiator as the polymerization initiator.
  • the curable pressure-sensitive adhesive layer forming composition is a so-called solventless pressure-sensitive adhesive layer forming composition, and is prepared by mixing the polymerization initiator and the like with the monomer composition. .
  • the monomer composition is composed of a mixture of monomer components such as (meth) acrylic acid alkyl ester, hydroxyl group-containing monomer, and heterocyclic ring-containing vinyl monomer.
  • the said monomer composition changes with the kind of monomer component, a composition ratio, etc., normally it has comprised the liquid state. Therefore, in order to increase the viscosity of the monomer composition and improve workability (handleability), etc., the monomer component contained in the monomer composition is partially polymerized in advance. A polymer may be formed.
  • a syrup-like syrup-like (viscous liquid) composition in which a polymer formed from a part of monomer components and unreacted monomers are mixed can be obtained (hereinafter referred to as such).
  • the partially polymerized product may be referred to as “syrup composition” or simply “syrup”.
  • the curable composition for forming a pressure-sensitive adhesive layer is prepared by adding the other components to the syrup composition as necessary.
  • the unreacted monomer component contained in the syrup composition is appropriately polymerized when the curable pressure-sensitive adhesive layer forming composition is cured.
  • the monomer components in the monomer composition may be appropriately polymerized using various polymerization initiators (for example, photopolymerization initiators) exemplified in the item of the acrylic polymer (a).
  • the polymerization rate of the partial polymer in the syrup composition is adjusted to, for example, 5 to 15% by mass, preferably 7 to 10% by mass.
  • the polymerization rate of the partial polymer for example, the correlation between the viscosity of the syrup composition and the polymerization rate of the partial polymer is grasped in advance, and the viscosity of the syrup composition is determined based on the correlation. It can adjust suitably by adjusting.
  • the partial polymer is finally contained in the pressure-sensitive adhesive layer (A) as a part of the acrylic polymer (a).
  • the polyfunctional monomer is blended in the monomer composition before the partial polymer is formed. Alternatively, it may be blended into the syrup-like composition after the partial polymer is formed. However, from the viewpoint of forming the cross-linked acrylic polymer (a) and reliably increasing the cohesiveness of the pressure-sensitive adhesive layer (A), the polyfunctional monomer is the above-mentioned after the partial polymer is formed. It is preferable to mix
  • the curable pressure-sensitive adhesive layer-forming composition is applied in a layered manner on a suitable support such as a release liner or a substrate described later after preparation. Thereafter, a curing step is performed on the layered pressure-sensitive adhesive layer forming composition. Moreover, a drying process is given before and after a hardening process as needed.
  • the composition for forming an adhesive layer contains a thermal polymerization initiator as a polymerization initiator, the composition for forming an adhesive layer is cured by starting a polymerization reaction by heating.
  • the pressure-sensitive adhesive layer forming composition contains a photopolymerization initiator as a polymerization initiator
  • the pressure-sensitive adhesive layer forming composition undergoes a polymerization reaction by irradiation with active energy rays such as ultraviolet rays. It is initiated and cured (photocured).
  • the active energy ray may be irradiated from one side of the layered pressure-sensitive adhesive layer-forming composition or from both sides.
  • a known or conventional oxygen blocking method for example, a layered pressure-sensitive adhesive layer-forming composition (adhesive) is used so that the polymerization reaction is not inhibited by oxygen in the air when curing with active energy rays (photocuring).
  • An appropriate support such as a release liner or a base material may be bonded onto the agent layer (A)), or a photocuring reaction may be performed in a nitrogen atmosphere).
  • a known or conventional coating method for the application (coating) of the pressure-sensitive adhesive layer forming composition, a known or conventional coating method can be used, and a general coater (for example, a gravure roll coater, a reverse roll coater, a kiss roll).
  • the pressure-sensitive adhesive layer (A) is a composition for forming a pressure-sensitive adhesive layer other than the above-described composition for forming a pressure-sensitive adhesive layer (for example, solvent-type pressure-sensitive adhesive layer formation), unless the object of the present invention is impaired.
  • a pressure-sensitive adhesive layer-forming composition for example, an emulsion-type pressure-sensitive adhesive layer-forming composition.
  • the thickness (upper limit) of the pressure-sensitive adhesive layer (A) in the pressure-sensitive adhesive sheet of the present embodiment is preferably 300 ⁇ m or less. Since the pressure-sensitive adhesive sheet of the present invention includes the viscoelastic body layer (B), even if the pressure-sensitive adhesive layer (A) has a thickness of 300 ⁇ m or less, it effectively absorbs unevenness and steps on the adherend surface. It is possible to adhere well to the adherend surface, and high peel strength can be realized. From this viewpoint, the thickness of the pressure-sensitive adhesive layer (A) is preferably 300 ⁇ m or less, more preferably 250 ⁇ m or less, and still more preferably 220 ⁇ m or less.
  • the thickness (lower limit) of the pressure-sensitive adhesive layer (A) is not particularly limited, and can be, for example, 1 ⁇ m or more. From the viewpoint of peel strength and the like, the thickness of the pressure-sensitive adhesive layer (A) is suitably 10 ⁇ m or more. In the present invention, the thickness of the pressure-sensitive adhesive layer (A) can be 50 ⁇ m or more, and may be 90 ⁇ m or more (for example, more than 100 ⁇ m).
  • the viscoelastic body layer (B) has a thickness of 200 ⁇ m or more and is a layer designed to support the pressure-sensitive adhesive layer (A) from the back surface of the pressure-sensitive adhesive surface.
  • the viscoelastic layer (B) may be an adhesive layer or a non-adhesive layer. Although it does not specifically limit, In the adhesive sheet of this embodiment, it is preferable that a viscoelastic body layer (B) is an adhesive layer.
  • the “adhesive layer” is a SUS304 stainless steel plate as an adherend in accordance with JIS Z0237 (2004), and a 2 kg roller is reciprocated once in a measurement environment at 23 ° C. to be bonded to the adherend. It means a layer having a peel strength of 0.1 N / 20 mm or more when peeled in the 180 ° direction under the condition of a tensile speed of 300 mm / min 30 minutes later.
  • the “non-adhesive layer” refers to a layer not corresponding to the adhesive layer, and typically refers to a layer having a peel strength of less than 0.1 N / 20 mm.
  • the layer that does not stick to the stainless steel plate when the 2 kg roller is reciprocated once in a measurement environment of 23 ° C. and pressed against the SUS304 stainless steel plate is a non-adhesive layer here. This is a typical example included in the concept.
  • the viscoelastic body layer (B) is not particularly limited as long as it exhibits the properties of a viscoelastic body in a temperature range near room temperature.
  • the “viscoelastic body” means a material having both properties of viscosity and elasticity, that is, a material having a property that satisfies the phase of the complex elastic modulus exceeding 0 and less than ⁇ / 2 (typically 25 ° C.
  • the material having the above-mentioned properties typically from the viewpoint of flexibility and the like, a material having a property satisfying the complex tensile modulus E * (1 Hz) ⁇ 10 7 dyne / cm 2 (typically a material having the above property at 25 ° C.) is preferable.
  • the viscoelastic body layer (B) is an acrylic viscoelastic body, rubber viscoelastic body, silicone viscoelastic body, polyester viscoelastic body, urethane viscoelastic body, polyether viscoelastic body, polyamide viscoelastic body.
  • the acrylic viscoelastic body refers to a viscoelastic body having an acrylic polymer as a base polymer. This also applies to rubber-based and other viscoelastic bodies.
  • the viscoelastic layer (B) preferably has a high shear strength, and hollow particles and other fillers can be added as necessary.
  • the viscoelastic body layer (B) is preferably an acrylic viscoelastic body containing an acrylic polymer (b) as a base polymer.
  • an acrylic polymer (b) as a base polymer.
  • the content (% by mass) of the acrylic polymer (b) in the viscoelastic layer (B) (100% by mass) is preferably 50% by mass or more, more preferably 60% by mass or more, and further more preferably 70% by mass or more. preferable.
  • the upper limit of the content (% by mass) is not particularly limited, but is preferably 98% by mass or less, and more preferably 90% by mass or less. When the content (mass%) is within such a range, it is easy to adjust the balance between flexibility and cohesion in the viscoelastic layer (B).
  • ((Meth) acrylic acid alkyl ester) As the acrylic polymer (b), for example, a polymer containing a structural unit derived from a (meth) acrylic acid alkyl ester having a linear or branched alkyl group having 1 to 20 carbon atoms is preferred.
  • the (meth) acrylic acid alkyl ester for example, the same (meth) acrylic acid alkyl ester used for forming the pressure-sensitive adhesive layer (A) can be used. Also in the acrylic polymer (b), the (meth) acrylic acid alkyl ester may be used alone or in combination of two or more.
  • the (meth) acrylic acid alkyl ester is preferably a (meth) acrylic acid alkyl ester having an alkyl group having 1 to 14 carbon atoms from the viewpoint of storage modulus of the pressure-sensitive adhesive, etc.
  • Butyl acrylate (BA) and 2-ethylhexyl acrylate (2EHA) are more preferable.
  • the proportion (lower limit) of the structural unit derived from the (meth) acrylic acid alkyl ester contained in the acrylic polymer (b) is not particularly limited, but is preferably 60% by mass or more, More preferably, it is 70 mass% or more, More preferably, it is 80 mass% or more.
  • the ratio (upper limit) is preferably 98% by mass or less, more preferably 95% by mass or less, from the viewpoint of the cohesiveness of the viscoelastic body layer (B).
  • the acrylic polymer (b) preferably contains a structural unit derived from a carboxyl group-containing monomer.
  • a carboxyl group-containing monomer the thing similar to the carboxyl group-containing monomer utilized for formation of an adhesive layer (A) can be used, for example.
  • the carboxyl group-containing monomers may be used alone or in combination of two or more.
  • acrylic acid (AA) is preferable.
  • the proportion (lower limit) of the mass of the structural unit derived from the carboxyl group-containing monomer contained in the acrylic polymer (b) is preferably 5% by mass or more, more preferably 7% by mass or more, and still more preferably. Is 10% by mass or more. Moreover, it is preferable that it is 40 mass% or less, and, as for the same ratio (upper limit), it is more preferable that it is 30 mass% or less.
  • the acrylic polymer (b) may contain a polyfunctional monomer.
  • a polyfunctional monomer the thing similar to the polyfunctional monomer utilized for formation of an adhesive layer (A) can be used, for example.
  • the polyfunctional monomer may be used alone or in combination of two or more.
  • the polyfunctional monomer is preferably a polyfunctional (meth) acrylate such as 1,6-hexanediol diacrylate (HDDA) or dipentaerythritol hexaacrylate (DPHA) from the viewpoint of reactivity.
  • a polyfunctional (meth) acrylate such as 1,6-hexanediol diacrylate (HDDA) or dipentaerythritol hexaacrylate (DPHA) from the viewpoint of reactivity.
  • the ratio (lower limit) of the structural unit derived from the polyfunctional monomer contained in the acrylic polymer (b) is 0.01% by mass or more. Moreover, it is preferable that it is 2 mass% or less from the viewpoint of the softness
  • the acrylic polymer (b) may contain a structural unit derived from a monomer other than the above-mentioned monomers for the purpose of adjusting the glass transition temperature (Tg) and improving the cohesive force.
  • Examples of such monomers include hydroxyl group-containing monomers, amide group-containing monomers, sulfonic acid group-containing monomers, phosphate group-containing monomers, aziridine group-containing monomers, amino group-containing monomers, keto group-containing monomers, isocyanate group-containing monomers, Alkoxy group-containing monomers, alkoxysilyl group-containing monomers, functional group-containing monomers such as macromonomers having a radical polymerizable vinyl group at the terminal of a monomer obtained by polymerizing vinyl groups, carboxylic acid vinyl esters, aromatic vinyl compounds, aromatic rings
  • Examples include (meth) acrylates, monomers having a nitrogen atom-containing ring, olefinic monomers, chlorine-containing monomers, and vinyl ether monomers. These may be used alone or in combination of two or more.
  • the proportion of the structural units derived from these monomers contained in the acrylic polymer (b) may be appropriately selected depending on the purpose and application, and is not particularly limited, but is 10% by mass or less. It is preferable.
  • the monomer composition of the acrylic polymer (b) is preferably adjusted so that the Tg of the acrylic polymer (b) is, for example, from ⁇ 70 ° C. to ⁇ 10 ° C.
  • the Tg of the acrylic polymer (b) is suitably ⁇ 20 ° C. or lower, preferably ⁇ 30 ° C. or lower, more preferably ⁇ 40 ° C. or lower, and further preferably ⁇ 50 ° C. or lower from the viewpoint of flexibility. From the viewpoint of cohesiveness, usually, the above Tg is preferably ⁇ 65 ° C. or higher.
  • the Tg of the acrylic polymer (b) refers to the Tg of the homopolymer (homopolymer) of each monomer constituting the acrylic polymer (b) and the mass fraction of the monomer (coefficient based on mass).
  • the Tg of the homopolymer a value described in known materials can be adopted.
  • the acrylic polymer (b) can be prepared by a known or commonly used polymerization method, similarly to the acrylic polymer (a).
  • a solution polymerization method, an emulsion polymerization method, a bulk polymerization method, a photopolymerization method and the like can be used alone or in combination of two or more, but an active energy ray using a photopolymerization initiator (for example, ultraviolet rays)
  • a photopolymerization initiator for example, ultraviolet rays
  • the same initiators as those that can be used for the polymerization of the acrylic polymer (a) can be used.
  • the viscoelastic layer (B) preferably contains a filler.
  • a filler in the viscoelastic layer (B)
  • the shear strength of the viscoelastic layer (B) can be increased.
  • the resistance (peeling strength) with respect to peeling an adhesive sheet from a to-be-adhered body can improve.
  • transformation of a viscoelastic body layer (B) can be suppressed, and the balance with the softness
  • the filler that can be added to the viscoelastic layer (B) is not particularly limited.
  • the same fillers as those exemplified as the filler that can be added to the pressure-sensitive adhesive layer (A) can be used.
  • hollow particles from the viewpoint of photocurability (polymerization reactivity) of the pressure-sensitive adhesive layer forming composition, hollow particles made of an inorganic material can be preferably used.
  • glass balloons such as hollow glass balloons are particularly preferable.
  • the average particle diameter of the hollow particles used for the pressure-sensitive adhesive layer (B) is not particularly limited. For example, it can be selected from the range of 1 ⁇ m to 500 ⁇ m, preferably 5 ⁇ m to 400 ⁇ m, more preferably 10 ⁇ m to 300 ⁇ m, and still more preferably 10 ⁇ m to 200 ⁇ m (for example, 10 to 150 ⁇ m).
  • the average particle diameter of the hollow particles is usually suitably 50% or less of the thickness of the viscoelastic layer (B), preferably 30% or less (for example, 10% or less).
  • the specific gravity of the hollow particles is not particularly limited, but for example, 0.1 to 1.8 g / cm 3 , preferably 0.1 to 1.5 g / cm 3 , more preferably in consideration of uniform dispersibility and mechanical strength.
  • the amount of the hollow particles used in the viscoelastic layer (B) is not particularly limited, and can be, for example, about 1 to 70% by mass as a whole, usually 5 to 50% by mass. About 10 to 40% by mass is preferable.
  • the viscoelastic layer (B) may have bubbles.
  • the cushioning property of the pressure-sensitive adhesive sheet can be improved and the flexibility can be increased.
  • the flexibility of the pressure-sensitive adhesive sheet increases, the pressure-sensitive adhesive sheet can easily absorb irregularities and steps on the surface of the adherend, so that the pressure-sensitive adhesive surface can be better adhered to the surface of the adherend.
  • Good adhesion of the pressure-sensitive adhesive surface to the adherend surface can advantageously contribute to an improvement in peel strength for low-polar surfaces and other various surfaces.
  • flexibility of an adhesive sheet can also contribute to reduction of the repulsive force of an adhesive sheet.
  • the viscoelastic layer (B) may include both the filler (for example, hollow particles) and bubbles as described above.
  • the pressure-sensitive adhesive sheet containing such a viscoelastic layer (B) is preferable because it tends to have an excellent balance between flexibility and cohesive force.
  • the bubbles contained in the viscoelastic layer (B) may be closed cells, open cells, or a mixture of these. From the viewpoint of cushioning properties, the viscoelastic body layer (B) having a structure containing a lot of closed cells is more preferable.
  • gas components contained in the bubbles are not particularly limited, and are inert gases such as nitrogen, carbon dioxide, and argon. In addition, various gas components such as air may be used.
  • the bubble forming gas when a polymerization reaction or the like is performed in a state where the bubble forming gas is included, it is preferable to use a gas that does not inhibit the reaction. From such viewpoints and cost viewpoints, nitrogen can be suitably employed as the bubble forming gas.
  • the shape of the bubble is typically generally spherical, but is not limited thereto.
  • the average diameter of the bubbles (average bubble diameter) is not particularly limited, and can be selected from the range of, for example, 1 ⁇ m to 1000 ⁇ m, preferably 10 ⁇ m to 500 ⁇ m, and more preferably 30 ⁇ m to 300 ⁇ m.
  • the average bubble diameter is usually suitably 50% or less of the thickness of the viscoelastic layer (B), preferably 30% or less (for example, 10% or less).
  • the volume ratio (bubble content rate) of the bubbles in the viscoelastic layer (B) is not particularly limited, and the intended cushioning and flexibility are realized. Can be set as appropriate. For example, it can be about 3 to 70% by volume with respect to the volume of the viscoelastic layer (B) (refers to the apparent volume and can be calculated from the thickness and area of the viscoelastic layer (B)). Usually, it is appropriate to be about 5 to 50% by volume, and preferably about 8 to 40% by volume.
  • the method for forming the viscoelastic body layer (B) having bubbles is not particularly limited, and a known method can be appropriately employed.
  • a composition for forming the viscoelastic body layer (B) hereinafter referred to as “composition for forming a viscoelastic body layer”
  • Viscoelastic body layer-forming composition preferably a composition of a type that forms a viscoelastic body by curing with an active energy ray such as ultraviolet rays
  • a bubble-forming gas is mixed in advance is contained in bubbles.
  • a method of forming a viscoelastic body layer (2) a method of forming a bubble-containing viscoelastic body layer by forming bubbles from the foaming agent using a viscoelastic body layer forming composition containing a foaming agent, and the like. It can be adopted as appropriate.
  • the foaming agent to be used is not particularly limited, and can be appropriately selected from known foaming agents.
  • a foaming agent such as a thermally expandable microsphere can be preferably used.
  • the method for preparing the viscoelastic material layer forming composition mixed with the bubble forming gas is not particularly limited, and a known bubble mixing method is used. be able to.
  • a bubble mixing device a stator having a large number of fine teeth on a disk having a through hole in the center, and a rotor facing the stator and having fine teeth similar to the stator on the disk And the like.
  • a composition for forming a viscoelastic body layer before mixing bubbles (hereinafter referred to as “a composition precursor for forming a viscoelastic body layer”). ) And a gas component for forming bubbles (bubble forming gas) is introduced into the composition precursor for forming a viscoelastic layer through the through holes while rotating the rotor at a high speed. Thereby, a composition for forming a viscoelastic body layer in which bubbles are finely dispersed and mixed is obtained.
  • a bubble-containing viscoelastic layer can be formed by applying the composition mixed with the bubble-forming gas in this manner onto a predetermined surface and curing the composition.
  • a heating method a method of irradiating active energy rays (for example, ultraviolet rays), or the like can be preferably employed.
  • Viscoelastic material layer forming composition mixed with bubble forming gas is heated and irradiated with actinic energy rays, etc., and cured in a state where bubbles are stably held, thereby suitably forming bubble-containing viscoelastic material layer can do.
  • a surfactant may be added to the composition for forming a viscoelastic body layer from the viewpoint of mixing property of bubble forming gas and stability of bubbles.
  • surfactants include ionic surfactants, hydrocarbon surfactants, silicone surfactants, and fluorine surfactants.
  • fluorine-based surfactants are preferable, and fluorine-based surfactants having an oxyalkylene group (typically an oxyalkylene group having 2 to 3 carbon atoms) and a fluorinated hydrocarbon group in the molecule are particularly preferable.
  • a fluorine-type surfactant can be used individually by 1 type or in combination of 2 or more types.
  • trade name “Surflon S-393” manufactured by AGC Seimi Chemical Co., Ltd. is exemplified.
  • the amount of the surfactant used is not particularly limited, and for example, about 0.01 to 3 parts by mass based on the solid content with respect to 100 parts by mass of the acrylic polymer contained in the viscoelastic layer (B). it can.
  • the viscoelastic layer (B) may contain a colorant (pigment, dye, etc.) as long as the object of the present invention is not impaired.
  • the colorant can be blended in the viscoelastic layer (B) as necessary in order to impart optical properties (for example, light-shielding properties) and design properties.
  • the colorant is not particularly limited.
  • carbon black for example, acetylene black, ketjen black, furnace black, channel black, thermal black
  • the amount of carbon black used is suitably, for example, 10% by mass or less, and preferably 5% by mass or less, based on the whole viscoelastic layer (B).
  • the viscoelastic material layer forming composition is cured by a photopolymerization method to form the viscoelastic material layer (B)
  • the photopolymerization is not alienated to color the viscoelastic material layer (B).
  • These pigments color pigments
  • black is desired as the coloring of the viscoelastic layer (B)
  • carbon black can be preferably used as the colorant.
  • the amount of carbon black used is, for example, suitably 10% by mass or less of the entire viscoelastic layer (B) in consideration of the degree of coloring, photopolymerization reactivity, and the like. % Or less is preferable.
  • the viscoelastic layer forming composition for forming the viscoelastic layer (B) is an acrylic polymer (for example, the monomer component described above) as a completely polymerized monomer component.
  • An acrylic polymer having a polymerization conversion rate of 95% by mass or more may be included.
  • it may be in the form of a solvent-type composition containing such an acrylic polymer in an organic solvent, a water-dispersed composition in which the acrylic polymer is dispersed in an aqueous solvent, and the like.
  • the composition for forming a viscoelastic body layer (B) for forming the viscoelastic body layer (B) contains a crosslinking agent in order to adjust the cohesive force of the viscoelastic body layer (B) according to the use of the pressure-sensitive adhesive sheet.
  • a crosslinking agent in order to adjust the cohesive force of the viscoelastic body layer (B) according to the use of the pressure-sensitive adhesive sheet.
  • composition for forming the viscoelastic layer (B) is a known addition of a plasticizer, a softener, an antioxidant, a leveling agent, a stabilizer, a preservative, etc., unless the object of the present invention is impaired.
  • An agent may be included as necessary.
  • the viscoelastic body layer (B) can be formed by the same method as the pressure-sensitive adhesive layer (A) described above.
  • a monomer composition composed of each monomer component used for forming the acrylic polymer (b), and a polymerization initiator for polymerizing the monomer component; It is preferable to use a curable viscoelastic material layer-forming composition containing a mixture with other components added as necessary.
  • the composition for forming a viscoelastic body layer is preferably a photocurable viscoelastic body layer forming composition using a photopolymerization initiator as the polymerization initiator.
  • the monomer component contained in the monomer composition in advance is the same as in forming the pressure-sensitive adhesive layer (A).
  • a partially polymerized syrup-like composition is preferred.
  • Other components for forming the above-described viscoelastic body layer (B) are added to the syrup-like composition as necessary to prepare a curable viscoelastic body layer forming composition.
  • a method of curing a viscoelastic body layer forming composition in which a bubble-forming gas is mixed in advance and (2) a foaming agent
  • the viscoelastic body layer (B) can be formed by appropriately selecting a method of forming bubbles from the foaming agent using the viscoelastic body layer forming composition.
  • the polymerization method for obtaining the syrup-like composition is not particularly limited, and various polymerization methods as described above can be appropriately selected and used. From the viewpoints of efficiency and simplicity, a photopolymerization method can be preferably employed.
  • the prepared curable viscoelastic body layer forming composition is applied in a layer form on a suitable support such as a substrate or a release liner, as in the case of forming the pressure-sensitive adhesive layer (A). In accordance with the drying step, the resin is cured.
  • the composition for forming a viscoelastic body layer contains a thermal polymerization initiator as a polymerization initiator, it is heated, and when it contains a photopolymerization initiator, it is irradiated with active energy rays such as ultraviolet rays. The polymerization reaction is started and curing is performed.
  • the active energy ray may be irradiated from one side of the layered viscoelastic material layer forming composition or from both sides.
  • seat provided with the viscoelastic body layer (B) which can be utilized for the adhesive sheet of this invention can be obtained.
  • the thickness (lower limit) of the viscoelastic layer (B) is typically 200 ⁇ m or more. Since the viscoelastic body layer (B) is a viscoelastic body, it is excellent in flexibility. Therefore, by supporting the pressure-sensitive adhesive layer (A) with the viscoelastic body layer (B), the surface (pressure-sensitive adhesive surface) of the pressure-sensitive adhesive layer (A) can be suitably adhered to the adherend.
  • As thickness of a viscoelastic body layer (B) 200 micrometers or more are preferable and 300 micrometers or more (for example, 400 micrometers or more) are more preferable.
  • the thickness of the viscoelastic layer (B) can be 500 ⁇ m or more, and may be 700 ⁇ m or more.
  • the technique disclosed here can also be preferably implemented in an embodiment in which the thickness of the viscoelastic layer (B) is 1 mm or more.
  • the upper limit of the thickness of the viscoelastic layer (B) is not particularly limited, and can be, for example, about 10 mm or less. From the viewpoint of easy formation of the viscoelastic layer (B), cohesiveness, and the like, the thickness of the viscoelastic layer (B) is usually suitably 5 mm or less, and preferably 3 mm or less (for example, 2 mm or less).
  • the surface (adhesive surface) of the adhesive layer (A) in the adhesive sheet may be protected by a release liner until use.
  • each pressure-sensitive adhesive surface may be protected by a separate release liner, or each pressure-sensitive adhesive surface may be protected by a single release liner in a form wound in a roll shape.
  • the release liner is used as a protective material for the adhesive surface, and is peeled off when it is attached to an adherend.
  • the release liner is not necessarily provided on the double-sided pressure-sensitive adhesive sheet.
  • release liner conventional release paper or the like can be used and is not particularly limited.
  • a substrate having a release treatment layer a low adhesive substrate made of a fluoropolymer, a low adhesive substrate made of a nonpolar polymer, or the like can be used.
  • a base material which has the said peeling process layer the base material surface-treated by peeling processing agents, such as a silicone type, a long-chain alkyl type, a fluorine type, molybdenum sulfide, is mentioned, for example.
  • fluorine-based polymer in the low-adhesive substrate made of the fluoropolymer examples include polytetrafluoroethylene, polychlorotrifluoroethylene, polyvinyl fluoride, polyvinylidene fluoride, tetrafluoroethylene-hexafluoropropylene copolymer, chloro Examples include fluoroethylene-vinylidene fluoride copolymer.
  • nonpolar polymer include olefinic resins (for example, polyethylene and polypropylene).
  • polyester films such as polyethylene terephthalate; olefin resin films such as polyethylene films and polypropylene films; polyvinyl chloride films; polyimide films; polyamide films such as nylon films; Plastic films such as rayon films, foam sheets made of foams such as polyurethane foam, woven and non-woven fabrics made of various fibrous materials alone or blended, metal foil such as aluminum foil and copper foil, fine paper, Japanese paper Papers such as kraft paper, glassine paper, synthetic paper, and top coat paper.
  • a polyester film or paper is preferable, and polyethylene terephthalate is more preferable.
  • the release liner can be formed by a known or conventional method. Further, the thickness of the release liner is not particularly limited.
  • the pressure-sensitive adhesive sheet may have a form provided with a support base material or the like.
  • the supporting substrate include plastic films such as polypropylene film, ethylene-propylene copolymer film, polyester film, and polyvinyl chloride film; foam sheet made of foam such as polyurethane foam, polyethylene foam, and polychloroprene foam; Woven and non-woven fabrics (Japanese paper, fine paper) of various fibrous materials (natural fibers such as hemp and cotton, synthetic fibers such as polyester and vinylon, semi-synthetic fibers such as acetate, etc.) alone or blended Etc.); metal foils such as aluminum foil and copper foil; etc. can be appropriately selected and used depending on the application of the pressure-sensitive adhesive sheet.
  • plastic film typically a non-porous plastic film, which is a concept distinguished from a woven fabric or a non-woven fabric
  • any of an unstretched film and a stretched (uniaxially stretched or biaxially stretched) film is used. Can also be used.
  • the thickness of the supporting substrate can be appropriately selected according to the purpose, but is generally about 2 ⁇ m to 500 ⁇ m, and generally about 10 ⁇ m to 200 ⁇ m can be preferably used.
  • the upper limit of the thickness of this support base material can be about 10 cm, for example, and it is suitable that it is usually about 5 cm (for example, about 2 cm).
  • the pressure-sensitive adhesive sheet 300 shown in FIG. 1 is a double-sided pressure-sensitive adhesive sheet having pressure-sensitive adhesive surfaces on both sides, and one pressure-sensitive adhesive layer (A) 10 constituting the first pressure-sensitive adhesive surface is formed on the surface of the viscoelastic body layer (B).
  • the pressure-sensitive adhesive layer (A) 10 that is supported and constitutes the second pressure-sensitive adhesive surface is supported on the back surface of the viscoelastic layer (B).
  • the first adhesive surface and the second adhesive surface are protected by release liners 120 and 120, respectively.
  • both the front and back pressure-sensitive adhesive surfaces that appear when the release liners 120 and 120 are peeled are higher than adherends having various polarities (high polarity and low polarity). Can exhibit adhesive strength.
  • the adhesive sheet 300 includes a thick viscoelastic body layer (B) (typically having a thickness of more than 200 ⁇ m), it can be excellent in flexibility. Taking advantage of such features, the pressure-sensitive adhesive sheet 300 can be applied to a wide range of adherends, for example, both of the front and back sides, and is highly versatile for firmly joining various adherends to each other. It can be used as an adhesive sheet.
  • the pressure-sensitive adhesive sheet may be implemented as a double-sided pressure-sensitive adhesive sheet having a structure in which only the pressure-sensitive adhesive layer (A) is provided on either the front or back surface of the viscoelastic body layer (B) that is a pressure-sensitive adhesive layer. it can.
  • the pressure-sensitive adhesive surface formed by the pressure-sensitive adhesive layer (A) can exhibit a high adhesive force on a wide range of adherends.
  • a thick viscoelastic body layer (B) is included, it can become the thing excellent in the softness
  • the pressure-sensitive adhesive sheet is composed of the pressure-sensitive adhesive layer (A) after the pressure-sensitive adhesive surface constituted by the viscoelastic body layer (B) is attached to an adherend that matches the characteristics.
  • the adhesive surface can be preferably used in a mode where it is affixed to various adherends as desired.
  • the viscoelastic layer (B) provided in the pressure-sensitive adhesive sheet may contain hollow particles, may contain bubbles, or may contain both bubbles and hollow particles.
  • Preferred examples from the viewpoint of weight reduction of the pressure-sensitive adhesive sheet include a structure in which the viscoelastic body layer (B) includes at least one of bubbles and hollow particles, a structure in which the viscoelastic body layer (B) includes at least hollow particles, and a viscoelastic body.
  • a layer (B) contains both a bubble and a hollow particle are mentioned.
  • the hollow particles and bubbles contained in the viscoelastic layer (B) may reduce the surface smoothness of the viscoelastic layer (B) depending on the size and content.
  • the smoothness of the surface of the viscoelastic body layer (B) is lowered, for example, when the viscoelastic body layer (B) is an adhesive layer and the surface is directly attached to the adherend, the adhesion to the adherend is reduced. It may become deficient and the peel strength may tend to decrease.
  • the pressure-sensitive adhesive layer (A) constituting the pressure-sensitive adhesive surface is disposed on both surfaces of the viscoelastic body layer (B).
  • the adhesion between the adherend and the adhesive surface is not easily affected by the surface smoothness of the viscoelastic layer (B). For this reason, it is easy to adjust the content ratio of the hollow particles and bubbles in the viscoelastic body layer (B), and an adhesive sheet having a better performance balance can be suitably realized.
  • each of the pressure-sensitive adhesive layer (A) and the viscoelastic layer (B) may have a single-layer structure or a multilayer structure of two or more layers (that is, a structure including a plurality of layers). May be.
  • the adhesive layer (A) which is not exposed to the surface of an adhesive sheet namely, does not comprise an adhesive surface
  • the pressure-sensitive adhesive sheet may include other layers such as an intermediate layer and an undercoat layer as long as the object of the present invention is not impaired.
  • the relationship between the thickness of the pressure-sensitive adhesive layer (A) and the thickness of the viscoelastic layer (B) is not particularly limited, but in the pressure-sensitive adhesive sheet, the thickness (lower limit) of the viscoelastic body layer (B) is It is preferable that the thickness is larger than the thickness of the pressure-sensitive adhesive layer (A). Usually, it is appropriate to make it 1.5 times or more, preferably 2 times or more, more preferably 3 times or more (for example, 5 times or more).
  • the thickness (upper limit) of the viscoelastic layer (B) can be, for example, 50 times or less the thickness of the pressure-sensitive adhesive layer (A), from the viewpoint of the balance between peel strength and cohesiveness. Usually, it is appropriate to make it 20 times or less, and preferably 10 times or less.
  • the value) is typically more than 200 ⁇ m, more preferably 300 ⁇ m or more, further preferably 400 ⁇ m or more, and particularly preferably 500 ⁇ m or more (for example, 700 ⁇ m or more).
  • the pressure-sensitive adhesive sheet can also be preferably implemented in an embodiment in which the total thickness of the parts used by being attached to the adherend exceeds 1 mm.
  • the upper limit of the total thickness of the same portion is not particularly limited, and can be, for example, about 15 mm or less, usually about 10 mm or less, preferably 7 mm or less, more preferably 5 mm or less (for example, 3 mm or less).
  • the pressure-sensitive adhesive sheet can be preferably used in a mode in which the pressure-sensitive adhesive surface comprising the pressure-sensitive adhesive layer (A) is attached to various adherends.
  • the pressure-sensitive adhesive sheet is, for example, a polyolefin resin such as polyethylene (PE) resin or polypropylene (PP) resin, acrylonitrile butadiene styrene copolymer (ABS) resin, high impact polystyrene (HIPS) resin, polycarbonate (PC) resin, PC Wide range of adherends from low-polarity adherends made of resin, such as polymer blend (PC / ABS) resin with ABS, to high-polarity adherends made of metal, such as stainless steel Can exhibit high adhesive strength.
  • a polyolefin resin such as polyethylene (PE) resin or polypropylene (PP) resin, acrylonitrile butadiene styrene copolymer (ABS) resin, high impact polystyrene (HIPS) resin, polycarbonate
  • the pressure-sensitive adhesive sheet has a thickness exceeding 200 ⁇ m by including the viscoelastic body layer (B) and has high flexibility (easy to be deformed), unevenness that may be present on the surface in joining various members, Curved surfaces or manufacturing errors of members can be absorbed by deformation of the adhesive, and the members can be joined with high reliability.
  • the pressure-sensitive adhesive sheet can express a high adhesive force to a wide range of adherends from a high-polarity adherend to a low-polarity adherend. Therefore, in joining various members, desired members can be joined regardless of the polarities of the materials constituting the members.
  • the pressure-sensitive adhesive sheet of the present embodiment can be used for various applications such as joining between members in various OA equipment, home appliances, automobiles, etc. (for example, fixing of various parts in such products).
  • an adhesive sheet can express favorable adhesive force with respect to a wide range of adherends, it is not restricted by the material of the target member. Therefore, it is not necessary to use the pressure-sensitive adhesive sheet properly, and it can be used very conveniently.
  • Example 1 Preparation of syrup I
  • a liquid monomer mixture comprising 78 parts by mass of 2-ethylhexyl acrylate (2EHA), 18 parts by mass of N-vinyl-2-pyrrolidone (NVP) and 4 parts by mass of 2-hydroxyethyl acrylate (HEA) ( Monomer composition) as a photopolymerization initiator, trade name “Irgacure 651 (2,2-dimethoxy-1,2-diphenylethane-1-one)” (manufactured by BASF Japan Ltd.) 0.05 parts by mass and product After blending 0.05 parts by weight of the name “Irgacure 184 (1-hydroxycyclohexyl phenyl ketone)” (manufactured by BASF Japan Ltd.), the viscosity (BH viscometer No.
  • adhesive layer sheet 111 As a release liner, two sheets of a polyethylene terephthalate base material (trade name “MRF”, manufactured by Mitsubishi Polyester Film Co., Ltd., or product name “MRN”, manufactured by Mitsubishi Polyester Film Co., Ltd.), one side of which was subjected to a release treatment, were prepared. .
  • the said adhesive layer forming composition 101 was apply
  • the coating layer was irradiated with ultraviolet rays having an illuminance of 5 mW / cm 2 from both sides for 3 minutes to cure the coating layer to obtain a pressure-sensitive adhesive layer (pressure-sensitive adhesive layer) having a thickness of 200 ⁇ m.
  • “Black Light” manufactured by Toshiba Corporation was used as a source of ultraviolet rays.
  • the illuminance of ultraviolet rays was adjusted using an industrial UV checker having a peak sensitivity wavelength of about 350 nm (trade name “UVR-T1”, manufactured by Topcon Corporation, light receiving unit type UD-T36, maximum sensitivity: 350 nm).
  • the pressure-sensitive adhesive layer sheet 111 release liner / pressure-sensitive adhesive layer A1 / release liner in which the pressure-sensitive adhesive layer A1 having a thickness of 200 ⁇ m was supported between the two release liners was produced.
  • composition 201 for forming a viscoelastic body layer.
  • the coating layer was irradiated with ultraviolet rays having an illuminance of 5 mW / cm 2 from both sides for 3 minutes to cure the coating layer to obtain a viscoelastic layer.
  • ultraviolet rays having an illuminance of 5 mW / cm 2 from both sides for 3 minutes to cure the coating layer to obtain a viscoelastic layer.
  • the product name “Black Light” manufactured by Toshiba Corporation and the product name “UVR-T1” manufactured by Topcon Corporation were used. .
  • the viscoelastic body layer sheet 211 in which the viscoelastic body layer B1 having a thickness of 800 ⁇ m was supported between the two release liners was produced.
  • This viscoelastic layer B1 is a viscoelastic layer that contains hollow particles but does not contain bubbles, and has adhesiveness.
  • a laminated double-sided pressure-sensitive adhesive sheet 301 (release liner / adhesive) provided with an adhesive layer A1 having a thickness of 200 ⁇ m on both sides of a viscoelastic layer B1 having a thickness of 800 ⁇ m and the outermost layers on both the front and back surfaces thereof protected by the release liner.
  • a laminated double-sided PSA sheet having a laminated structure of agent layer A1 / viscoelastic layer B1 / adhesive layer A1 / release liner) was obtained.
  • This laminated double-sided PSA sheet has a schematic cross section as shown in FIG.
  • Example 2 In preparing the composition for forming the pressure-sensitive adhesive layer, 0.030 part by mass of HDDA was used instead of 0.120 part by mass of HDDA, and an additional part was substituted for 0.5 part by mass of the photopolymerization initiator (Irgacure 651). Except having used 0.3 mass part of photoinitiators (Irgacure 651), it carried out similarly to the adhesive layer formation composition 101 of Example 1, and used the syrup I for the adhesive layer formation composition 102. Prepared.
  • the pressure-sensitive adhesive layer containing the pressure-sensitive adhesive layer A2 is the same as the pressure-sensitive adhesive layer sheet 111 of Example 1 except that the pressure-sensitive adhesive layer forming composition 102 is used instead of the pressure-sensitive adhesive layer forming composition 101.
  • a sheet 112 was produced.
  • the thickness of the pressure-sensitive adhesive layer A2 was 207 ⁇ m.
  • the solvent-insoluble fraction (mass%) of adhesive layer A2 was calculated
  • a thickness of 800 ⁇ m is obtained in the same manner as in Example 1 except that the adhesive layer sheet 112 is used instead of the adhesive layer sheet 111 by using the viscoelastic body layer sheet 211 including the viscoelastic body layer B1.
  • a laminated double-sided pressure-sensitive adhesive sheet (sheet of Example 2) in which a pressure-sensitive adhesive layer A2 having a thickness of 207 ⁇ m was held on both surfaces of the viscoelastic body layer B1 was obtained.
  • Example 3 In preparing the composition for forming the pressure-sensitive adhesive layer, 0.056 parts by mass of HDDA was used instead of 0.120 parts by mass of HDDA, and 0.5 parts by mass of an additional photopolymerization initiator (Irgacure 651) was added.
  • an additional photopolymerization initiator Irgacure 651
  • the pressure-sensitive adhesive layer containing the pressure-sensitive adhesive layer A3 is the same as the pressure-sensitive adhesive layer sheet 111 of Example 1 except that the pressure-sensitive adhesive layer forming composition 103 is used instead of the pressure-sensitive adhesive layer forming composition 101.
  • a sheet 113 was produced.
  • the thickness of the pressure-sensitive adhesive layer A3 was 212 ⁇ m.
  • the solvent insoluble fraction (mass%) of adhesive layer A3 was 56 mass%.
  • a thickness of 800 ⁇ m is obtained in the same manner as in Example 1 except that the adhesive layer sheet 113 is used instead of the adhesive layer sheet 111 by using the viscoelastic body layer sheet 211 including the viscoelastic body layer B1.
  • a laminated double-sided pressure-sensitive adhesive sheet (sheet of Example 3) in which a 212 ⁇ m-thick pressure-sensitive adhesive layer A3 was held on both surfaces of the viscoelastic layer B1 was obtained.
  • Example 4 In preparing the composition for forming the pressure-sensitive adhesive layer, 0.030 part by mass of HDDA was used instead of 0.120 part by mass of HDDA, and an additional part was substituted for 0.5 part by mass of an additional photopolymerization initiator (Irgacure 651). Except that 0.3 parts by weight of the photopolymerization initiator (Irgacure 651) was used, and 0.8 parts by weight of black pigment (AT DN101 black) was used instead of 1 part by weight of black pigment (AT DN101 black) Prepared a pressure-sensitive adhesive layer forming composition 104 using syrup I in the same manner as the pressure-sensitive adhesive layer forming composition 101 of Example 1.
  • an additional photopolymerization initiator Irgacure 651
  • AT DN101 black black pigment
  • the pressure-sensitive adhesive layer containing the pressure-sensitive adhesive layer A4 is the same as the pressure-sensitive adhesive layer sheet 111 of Example 1 except that the pressure-sensitive adhesive layer forming composition 104 is used instead of the pressure-sensitive adhesive layer forming composition 101.
  • a sheet 114 was produced.
  • the thickness of the pressure-sensitive adhesive layer A4 was 207 ⁇ m.
  • the solvent insoluble fraction (mass%) of adhesive layer A4 was 41 mass%.
  • a thickness of 800 ⁇ m is obtained in the same manner as in Example 1 except that the adhesive layer sheet 114 is used instead of the adhesive layer sheet 111 using the viscoelastic body layer sheet 211 including the viscoelastic body layer B1.
  • a laminated double-sided pressure-sensitive adhesive sheet (sheet of Example 4) in which a pressure-sensitive adhesive layer A4 having a thickness of 207 ⁇ m was held on both surfaces of the viscoelastic layer B1 was obtained.
  • Example 5 In preparing the pressure-sensitive adhesive layer-forming composition, 0.025 parts by mass of HDDA was used instead of 0.120 parts by mass of HDDA, and black pigment (AT DN101 black) was changed to 1 part by mass of black pigment (AT DN101 black). Except having used 3 mass parts, it carried out similarly to the composition 101 for adhesive layer formation of Example 1, and prepared the composition 105 for adhesive layer formation using the syrup I.
  • the pressure-sensitive adhesive layer containing the pressure-sensitive adhesive layer A5 is the same as the pressure-sensitive adhesive layer sheet 111 of Example 1 except that the pressure-sensitive adhesive layer forming composition 105 is used instead of the pressure-sensitive adhesive layer forming composition 101.
  • a sheet 115 was produced.
  • the thickness of the pressure-sensitive adhesive layer A5 was 200 ⁇ m.
  • the solvent-insoluble fraction (mass%) of adhesive layer A5 was calculated
  • a thickness of 800 ⁇ m is obtained in the same manner as in Example 1 except that the adhesive layer sheet 115 is used instead of the adhesive layer sheet 111 using the viscoelastic body layer sheet 211 including the viscoelastic body layer B1.
  • a laminated double-sided pressure-sensitive adhesive sheet (sheet of Example 5) in which the pressure-sensitive adhesive layer A5 having a thickness of 200 ⁇ m was held on both surfaces of the viscoelastic body layer B1 was obtained.
  • Example 6 Except that 0.025 parts by mass of HDDA was used instead of 0.120 parts by mass of HDDA in the preparation of the pressure-sensitive adhesive layer forming composition, and that no additional photopolymerization initiator (Irgacure 651) and black pigment were added.
  • a pressure-sensitive adhesive layer forming composition 106 was prepared using syrup I in the same manner as the pressure-sensitive adhesive layer forming composition 101 of Example 1.
  • the pressure-sensitive adhesive layer containing the pressure-sensitive adhesive layer A6 in the same manner as the pressure-sensitive adhesive layer sheet 111 of Example 1 except that the pressure-sensitive adhesive layer forming composition 106 was used instead of the pressure-sensitive adhesive layer forming composition 101.
  • a sheet 116 was produced.
  • the thickness of the pressure-sensitive adhesive layer A6 was 145 ⁇ m.
  • the solvent insoluble fraction (mass%) of adhesive layer A6 was 82 mass%.
  • a thickness of 800 ⁇ m is obtained in the same manner as in Example 1 except that the viscoelastic body layer sheet 211 including the viscoelastic body layer B1 is used and the adhesive layer sheet 116 is used instead of the adhesive layer sheet 111.
  • a laminated double-sided pressure-sensitive adhesive sheet (sheet of Example 6) in which a pressure-sensitive adhesive layer A6 having a thickness of 145 ⁇ m was held on both surfaces of the viscoelastic body layer B1 was obtained.
  • Example 7 In preparing the pressure-sensitive adhesive layer forming composition, AA 1 part by mass was used instead of AA 4 parts by mass, HDDA 0.025 parts by mass was used instead of HDDA 0.120 parts by mass, and an additional photopolymerization initiator (A pressure-sensitive adhesive layer forming composition 107 was prepared using syrup I in the same manner as the pressure-sensitive adhesive layer forming composition 101 of Example 1 except that Irgacure 651) and the black pigment were not added.
  • the pressure-sensitive adhesive layer containing the pressure-sensitive adhesive layer A7 was used in the same manner as the pressure-sensitive adhesive layer sheet 111 of Example 1 except that the pressure-sensitive adhesive layer forming composition 107 was used.
  • An agent layer sheet 117 was produced.
  • the thickness of the pressure-sensitive adhesive layer A7 was 149 ⁇ m.
  • the solvent insoluble content rate (mass%) of adhesive layer A7 was 80 mass%.
  • a thickness of 800 ⁇ m is obtained in the same manner as in Example 1 except that the viscoelastic body layer sheet 211 including the viscoelastic body layer B1 is used and the adhesive layer sheet 117 is used instead of the adhesive layer sheet 111.
  • a laminated double-sided pressure-sensitive adhesive sheet (sheet of Example 7) in which a pressure-sensitive adhesive layer A7 having a thickness of 149 ⁇ m was held on both surfaces of the viscoelastic body layer B1 was obtained.
  • Example 8 In preparing the pressure-sensitive adhesive layer forming composition, AA, an additional photopolymerization initiator (Irgacure 651), and the black pigment were not added, and the same as the pressure-sensitive adhesive layer forming composition 101 of Example 1. Thus, a pressure-sensitive adhesive layer forming composition 108 was prepared using syrup I.
  • the pressure-sensitive adhesive layer containing the pressure-sensitive adhesive layer A8 is the same as the pressure-sensitive adhesive layer sheet 111 of Example 1, except that the pressure-sensitive adhesive layer forming composition 108 is used instead of the pressure-sensitive adhesive layer forming composition 101.
  • a sheet 118 was produced.
  • the thickness of the pressure-sensitive adhesive layer A8 was 144 ⁇ m.
  • the solvent-insoluble fraction (mass%) of adhesive layer A8 was calculated
  • a thickness of 800 ⁇ m was obtained in the same manner as in Example 1 except that the adhesive layer sheet 118 was used instead of the adhesive layer sheet 111 using the viscoelastic body layer sheet 211 including the viscoelastic body layer B1.
  • a laminated double-sided pressure-sensitive adhesive sheet (sheet of Example 8) in which the adhesive layer A8 having a thickness of 144 ⁇ m was held on both surfaces of the viscoelastic body layer B1 was obtained.
  • Example 9 In the same manner as in Example 1, a pressure-sensitive adhesive layer sheet 111 including the pressure-sensitive adhesive layer A1 was produced using the pressure-sensitive adhesive layer forming composition 101.
  • the composition precursor for forming the viscoelastic body layer is divided into a stator having a large number of fine teeth on a disk having a through hole in the center, and fine teeth similar to the stator on the disk facing the stator.
  • the composition for forming a viscoelastic material layer 202 in which bubbles are dispersed and mixed is obtained by stirring together with nitrogen gas introduced from the through-hole of the device using a bubble mixing device equipped with a rotor. In addition, it mixed so that a bubble might be about 20 volume% with respect to the whole volume of this composition 202 for bubble-containing viscoelastic body layer formation.
  • This viscoelastic body layer B2 is a viscoelastic body layer containing hollow particles and bubbles, and is an adhesive layer having adhesiveness.
  • a laminated double-sided pressure-sensitive adhesive sheet 309 having a pressure-sensitive adhesive layer A1 having a thickness of 200 ⁇ m on both sides of a viscoelastic layer B2 having a thickness of 800 ⁇ m and a release liner on both front and back surfaces release liner / pressure-sensitive adhesive layer A1 /
  • a laminated double-sided PSA sheet having a laminated structure of viscoelastic layer B2 / adhesive layer A1 / release liner was obtained.
  • This laminated double-sided pressure-sensitive adhesive sheet 309 is referred to as a sheet of Example 9.
  • Example 10 Similarly to Example 2, a pressure-sensitive adhesive layer sheet 112 including the pressure-sensitive adhesive layer A2 was produced using the pressure-sensitive adhesive layer forming composition 102. Further, the viscoelastic body layer sheet 212 including the viscoelastic body layer B2 is used in the same manner as in Example 9 except that the adhesive layer sheet 112 is used instead of the adhesive layer sheet 111, and the thickness is 800 ⁇ m. A laminated double-sided pressure-sensitive adhesive sheet (sheet of Example 10) in which a pressure-sensitive adhesive layer A2 having a thickness of 207 ⁇ m was held on both surfaces of the viscoelastic body layer B2 was obtained.
  • Example 11 Similarly to Example 3, a pressure-sensitive adhesive layer sheet 113 including a pressure-sensitive adhesive layer A3 was produced using the pressure-sensitive adhesive layer forming composition 103. Further, the viscoelastic body layer sheet 212 including the viscoelastic body layer B2 is used in the same manner as in Example 9 except that the adhesive layer sheet 113 is used instead of the adhesive layer sheet 111, and the thickness is 800 ⁇ m. A laminated double-sided pressure-sensitive adhesive sheet (sheet of Example 11) in which a 212 ⁇ m-thick pressure-sensitive adhesive layer A3 was held on both surfaces of the viscoelastic layer B2 was obtained.
  • Example 12 Similarly to Example 4, a pressure-sensitive adhesive layer sheet 114 including a pressure-sensitive adhesive layer A4 was produced using the pressure-sensitive adhesive layer forming composition 104. Furthermore, except that the adhesive layer sheet 114 was used instead of the adhesive layer sheet 111, the viscoelastic body layer sheet 212 including the viscoelastic body layer B2 was used in the same manner as in Example 9, and the thickness was 800 ⁇ m. A laminated double-sided pressure-sensitive adhesive sheet (sheet of Example 12) in which a pressure-sensitive adhesive layer A4 having a thickness of 207 ⁇ m was held on both surfaces of the viscoelastic layer B2 was obtained.
  • Example 13 In the same manner as in Example 5, a pressure-sensitive adhesive layer sheet 115 including a pressure-sensitive adhesive layer A5 was produced using the pressure-sensitive adhesive layer forming composition 105. Further, the viscoelastic body layer sheet 212 including the viscoelastic body layer B2 is used in the same manner as in Example 9 except that the adhesive layer sheet 115 is used instead of the adhesive layer sheet 111, and the thickness is 800 ⁇ m. A laminated double-sided pressure-sensitive adhesive sheet (sheet of Example 13) in which a pressure-sensitive adhesive layer A5 having a thickness of 200 ⁇ m was held on both surfaces of the viscoelastic body layer B2 was obtained.
  • Example 14 In the same manner as in Example 6, the pressure-sensitive adhesive layer sheet 116 including the pressure-sensitive adhesive layer A6 was produced using the pressure-sensitive adhesive layer forming composition 106. Furthermore, except that the adhesive layer sheet 111 was used instead of the adhesive layer sheet 111, the viscoelastic body layer sheet 212 including the viscoelastic body layer B2 was used in the same manner as in Example 9, and the thickness was 800 ⁇ m. A laminated double-sided pressure-sensitive adhesive sheet (sheet of Example 14) in which a 145 ⁇ m-thick pressure-sensitive adhesive layer A6 was held on both surfaces of the viscoelastic body layer B2 was obtained.
  • Example 15 In the same manner as in Example 7, a pressure-sensitive adhesive layer sheet 117 including the pressure-sensitive adhesive layer A7 was produced using the pressure-sensitive adhesive layer forming composition 107. Furthermore, except that the adhesive layer sheet 117 was used instead of the adhesive layer sheet 111, the viscoelastic body layer sheet 212 including the viscoelastic body layer B2 was used in the same manner as in Example 9, and the thickness was 800 ⁇ m. A laminated double-sided pressure-sensitive adhesive sheet (the sheet of Example 15) in which a pressure-sensitive adhesive layer A7 having a thickness of 149 ⁇ m was held on both surfaces of the viscoelastic body layer B2 was obtained.
  • Example 16 In the same manner as in Example 8, the pressure-sensitive adhesive layer sheet 118 including the pressure-sensitive adhesive layer A8 was produced using the pressure-sensitive adhesive layer forming composition. Furthermore, except that the adhesive layer sheet 118 was used instead of the adhesive layer sheet 111, the viscoelastic body layer sheet 212 including the viscoelastic body layer B2 was used in the same manner as in Example 9, and the thickness was 800 ⁇ m. A laminated double-sided pressure-sensitive adhesive sheet (sheet of Example 16) in which a pressure-sensitive adhesive layer A8 having a thickness of 144 ⁇ m was held on both surfaces of the viscoelastic body layer B2 was obtained.
  • a pressure-sensitive adhesive layer sheet 111 including a pressure-sensitive adhesive layer A1 having a thickness of 200 ⁇ m was prepared using the pressure-sensitive adhesive layer forming composition 101.
  • This pressure-sensitive adhesive layer sheet 111 double-sided pressure-sensitive adhesive sheet having the structure of release liner / pressure-sensitive adhesive layer A1 / release liner) was used as the sheet of Comparative Example 1 as it was.
  • a viscoelastic body layer sheet 211 including a viscoelastic body layer B1 having a thickness of 800 ⁇ m was prepared using the composition 201 for forming a viscoelastic body layer.
  • This viscoelastic layer sheet 211 double-sided pressure-sensitive adhesive sheet having the structure of release liner / viscoelastic layer B1 / release liner
  • a viscoelastic body layer sheet 212 including a viscoelastic body layer B2 having a thickness of 800 ⁇ m was produced using the viscoelastic body layer forming composition 202.
  • This viscoelastic layer sheet 212 (release liner / viscoelastic layer B2 / double-sided pressure-sensitive adhesive sheet having a release liner structure) was used as the sheet of Comparative Example 3 as it was.
  • the release liner was peeled off from one surface of the sheets according to Examples 1 to 16 and Comparative Examples 1 to 3, and was attached to a 130 ⁇ m-thick aluminum foil subjected to alumite treatment to be lined.
  • a test piece was prepared by cutting the backed adhesive sheet into a width of 25 mm and a length of 70 mm.
  • the adherend As the adherend, the surfaces of polystyrene (PSt), polycarbonate (PC), acrylonitrile butadiene styrene (ABS) resin plate, and stainless steel (SUS) plate were washed with isopropyl alcohol (IPA).
  • IPA isopropyl alcohol
  • the release liner was peeled from each test piece, the pressure-sensitive adhesive surface was brought into contact with the adherend plate, and the 5-kg roller was reciprocated twice for pressure bonding. After the pressure bonding, it was aged for 20 minutes in an atmosphere of 23 ° C. and 50% RH.
  • Table 1 The measurement results of 90 degree peel strength are shown in Table 1.
  • the table also shows the composition of the main components of the pressure-sensitive adhesive layer forming composition used for the production of the sheets of Examples and Comparative Examples. “-” In each table means that the corresponding component is not contained (zero) or that the 90-degree peel strength test has not been performed. Moreover, it shows below about the abbreviation described in the table
  • the peel strength of the pressure-sensitive adhesive sheet (Comparative Example 1) having only the pressure-sensitive adhesive layer A1 is 37.1 N / 25 mm to 45.5 N / 25 mm, and the peel strength for any adherend is 40 N / It was around 25 mm.
  • the adhesive sheet (Comparative Examples 2 and 3) having only the viscoelastic layer B1 or B2 showed a high peel strength of 60 N / 25 mm or more for SUS, but the peel strength for ABS and PSt was 40 N / 25 mm. Was less than.
  • the peel strength of the laminated double-sided pressure-sensitive adhesive sheet of the present invention (Examples 1 and 9) provided with the pressure-sensitive adhesive layer A1 on both sides of the viscoelastic body layer B1 or B2 is almost equal to any adherend. It was 60 N / 25 mm or more, and showed high peel strength. From this, it was confirmed that the laminated double-sided pressure-sensitive adhesive sheet of each Example was able to exhibit high adhesive force on a wide range of adherends including those with low polarity, regardless of the polarity of the adherend. did it.
  • the reason why the overall peel strength is improved as compared with the pressure-sensitive adhesive layer (A) only is that it is pressure-bonded to the adherend together with the viscoelastic layer (B) having a certain thickness and flexibility.
  • the pressure-sensitive adhesive layer (A) is supported by the viscoelastic body layer (B) from the back side.
  • the adhesive layer (A) is kept in close contact with the adherend surface, and the laminated double-sided PSA sheet has a viscoelastic body layer (B) having a certain thickness and flexibility. It can be considered that resistance can be achieved not by lines but by surfaces.
  • the reason why the peel strength for an adherend having a low polarity is improved as compared with the pressure-sensitive adhesive sheet having only the viscoelastic layer (B) is derived from both at least a hydroxyl group-containing monomer and a heterocyclic ring-containing vinyl monomer.
  • the peel strength of the laminated double-sided PSA sheets of Examples 1 to 16 with respect to PSt was improved about 1.1 to 1.7 times compared to the PSA sheet having only the PSA layer A1 (Comparative Example 1). Further, compared with the pressure-sensitive adhesive sheet having only the viscoelastic layer B1 or B2 (Comparative Example 2 or 3), it was greatly improved by 1.8 to 3.1 times.
  • the pressure-sensitive adhesive sheet using B2 as a viscoelastic body layer was generally higher than the PSA sheet using the viscoelastic body layer B1.
  • the viscoelastic layer B2 contains 20% by volume of bubbles in addition to the hollow particles, and is more flexible than the viscoelastic layer B1. For this reason, as a result of supporting the pressure-sensitive adhesive layer (A) while flexibly deforming so that the pressure-sensitive adhesive layer (A) can be adhered along fine irregularities on the surface of the adherend, it is possible to express high adhesive force. Inferred.
  • the PSA sheet prepared by additionally adding a carboxyl group-containing monomer (acrylic acid) to the PSA layer forming composition exhibited a high peel strength of 45 N / 25 mm or more.
  • the pressure-sensitive adhesive sheet prepared so that the structural unit derived from the carboxyl group-containing monomer in the acrylic polymer (a) was 3.8% by mass or more showed a higher peel strength of 47 N / 25 mm.
  • Each of the pressure-sensitive adhesive sheets of Examples 1 to 16 was prepared by adding a polyfunctional monomer to the pressure-sensitive adhesive layer forming composition, and the higher the amount of the polyfunctional monomer added, the higher the peel strength. There was a tendency to show.
  • the pressure-sensitive adhesive sheet to which black pigment was added to the pressure-sensitive adhesive layer and the initiator (Irg651) was additionally added generally showed higher adhesive strength than the pressure-sensitive adhesive sheet prepared without adding them.
  • a colorant or the like in order to impart light-shielding properties and design properties. Therefore, such knowledge can be said to be very useful.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Adhesive Tapes (AREA)
  • Laminated Bodies (AREA)

Abstract

Cette feuille adhésive sensible à la pression comprend : une couche adhésive (A) sensible à la pression qui forme une surface adhésive sensible à la pression et comprend un polymère acrylique (a) utilisé comme polymère de base ; et une couche (B) de corps viscoélastique permettant de supporter la couche adhésive (A) sensible à la pression. Le polymère acrylique (a) contient une proportion supérieure ou égale à 2 % en masse d'un motif constituant dérivé de préférence d'un monomère contenant un groupe hydroxyle utilisé comme monomère contenant un groupe acide, et contient une proportion supérieure ou égale à 10 % en masse d'un motif constituant dérivé de préférence d'un monomère vinylique contenant un noyau hétérocyclique utilisé comme monomère contenant un groupe basique. L'épaisseur de la couche (B) de corps viscoélastique est d'au moins 200 μm.
PCT/JP2015/051775 2014-02-06 2015-01-23 Feuille adhésive sensible à la pression WO2015118960A1 (fr)

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
WO2019220294A1 (fr) * 2018-05-14 2019-11-21 3M Innovative Properties Company Ensemble adhésif multicouche sensible à la pression

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Publication number Priority date Publication date Assignee Title
JP6804919B2 (ja) * 2016-09-29 2020-12-23 日東電工株式会社 フィラー含有粘着テープ及びフィラー含有粘着テープの製造方法
JP6949735B2 (ja) * 2016-12-02 2021-10-13 積水化学工業株式会社 建築用面構造

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JPH07133467A (ja) * 1993-11-10 1995-05-23 Sekisui Chem Co Ltd アクリル系粘着テープ
JPH08209083A (ja) * 1995-02-02 1996-08-13 Sekisui Chem Co Ltd アクリル系粘着剤およびアクリル系粘着テープ
JP2006022189A (ja) * 2004-07-07 2006-01-26 Nitto Denko Corp 気泡含有粘弾性組成物、及び感圧性接着テープ又はシート
JP2009185229A (ja) * 2008-02-08 2009-08-20 Nitto Denko Corp アクリル系粘着シート
JP2009256607A (ja) * 2008-03-17 2009-11-05 Nitto Denko Corp アクリル系粘着剤、アクリル系粘着剤層、アクリル系粘着テープ又はシート
JP2010209263A (ja) * 2009-03-11 2010-09-24 Nitto Denko Corp アクリル系粘着シート
JP2013122035A (ja) * 2011-11-10 2013-06-20 Nitto Denko Corp 粘着シート

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JPH07133467A (ja) * 1993-11-10 1995-05-23 Sekisui Chem Co Ltd アクリル系粘着テープ
JPH08209083A (ja) * 1995-02-02 1996-08-13 Sekisui Chem Co Ltd アクリル系粘着剤およびアクリル系粘着テープ
JP2006022189A (ja) * 2004-07-07 2006-01-26 Nitto Denko Corp 気泡含有粘弾性組成物、及び感圧性接着テープ又はシート
JP2009185229A (ja) * 2008-02-08 2009-08-20 Nitto Denko Corp アクリル系粘着シート
JP2009256607A (ja) * 2008-03-17 2009-11-05 Nitto Denko Corp アクリル系粘着剤、アクリル系粘着剤層、アクリル系粘着テープ又はシート
JP2010209263A (ja) * 2009-03-11 2010-09-24 Nitto Denko Corp アクリル系粘着シート
JP2013122035A (ja) * 2011-11-10 2013-06-20 Nitto Denko Corp 粘着シート

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019220294A1 (fr) * 2018-05-14 2019-11-21 3M Innovative Properties Company Ensemble adhésif multicouche sensible à la pression

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