WO2022208815A1 - 粘着剤組成物及び粘着テープ - Google Patents

粘着剤組成物及び粘着テープ Download PDF

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Publication number
WO2022208815A1
WO2022208815A1 PCT/JP2021/014053 JP2021014053W WO2022208815A1 WO 2022208815 A1 WO2022208815 A1 WO 2022208815A1 JP 2021014053 W JP2021014053 W JP 2021014053W WO 2022208815 A1 WO2022208815 A1 WO 2022208815A1
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Prior art keywords
monomer
pressure
sensitive adhesive
mass
acrylic copolymer
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Ceased
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PCT/JP2021/014053
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English (en)
French (fr)
Japanese (ja)
Inventor
靖史 土屋
菖子 岡村
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Teraoka Seisakusho Co Ltd
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Teraoka Seisakusho Co Ltd
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Priority to PCT/JP2021/014053 priority Critical patent/WO2022208815A1/ja
Priority to KR1020237032042A priority patent/KR102888740B1/ko
Priority to EP21934977.6A priority patent/EP4317347A4/en
Priority to JP2023510088A priority patent/JP7671841B2/ja
Priority to US18/552,654 priority patent/US20240174899A1/en
Priority to CN202180096632.0A priority patent/CN117120570A/zh
Priority to TW111109971A priority patent/TWI909021B/zh
Publication of WO2022208815A1 publication Critical patent/WO2022208815A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • C09J7/385—Acrylic polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/10—Esters
    • C08F220/12—Esters of monohydric alcohols or phenols
    • C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
    • C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
    • C08F220/1808—C8-(meth)acrylate, e.g. isooctyl (meth)acrylate or 2-ethylhexyl (meth)acrylate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/02—Non-macromolecular additives
    • C09J11/06—Non-macromolecular additives organic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C09J133/04—Homopolymers or copolymers of esters
    • C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • 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
    • 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
    • C09J133/10—Homopolymers or copolymers of methacrylic 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
    • C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
    • C09J2203/326—Applications of adhesives in processes or use of adhesives in the form of films or foils for bonding electronic components such as wafers, chips or semiconductors
    • 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
    • C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
    • C09J2301/12—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers
    • C09J2301/122—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present only on one side of the carrier, e.g. single-sided adhesive tape
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
    • C09J2301/302—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier the adhesive being pressure-sensitive, i.e. tacky at temperatures inferior to 30°C
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
    • C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature
    • 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
    • C09J2301/408—Additional features of adhesives in the form of films or foils characterized by the presence of essential components additives as essential feature of the adhesive 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
    • C09J2433/00—Presence of (meth)acrylic polymer

Definitions

  • the present invention is an acrylic adhesive that has adhesiveness, high temperature retention, load resistance, and impact resistance that has been developed assuming fixing of portable electronic devices such as smartphones and tablet terminals, automobile sensors, drive recorders, etc.
  • adhesiveness is improved due to properties including tackiness, and resin materials used with the practical use of 5G, especially POM (polyoxymethylene; polyacetal).
  • POM polyoxymethylene; polyacetal
  • the present invention relates to a pressure-sensitive adhesive composition and a pressure-sensitive adhesive tape having excellent sticking properties to materials.
  • 5G stands for “5th Generation”.
  • MIMO Multiple-Input and Multiple-Output
  • adhesives and adhesive tapes that have been developed assuming fixing of portable electronic devices such as smartphones and tablet terminals, sensors in automobiles, drive recorders, etc. Impact resistance and waterproofness have been required.
  • adhesive tapes specialized for such properties have weak tack on the surface of the adhesive layer and are good at adhering to metals, while resin materials, especially difficult-to-adhere resin materials such as POM, are used. In some cases, the sticking property to the surface is poor, and the characteristics cannot be exhibited for the resin material suitable for 5G as described above.
  • Patent Document 1 in view of the fact that materials used in automobiles and the like are currently being replaced from metal-based materials to plastic-based materials, while maintaining the tackiness and cohesion required for adhesive properties provide a pressure-sensitive adhesive composition capable of forming a pressure-sensitive adhesive layer having high stress relaxation in a high-temperature environment and high adhesion to low-polarity adherends.
  • This pressure-sensitive adhesive composition comprises a (meth)acrylic copolymer (A) having an acid value of 7.8 to 45, a rosin-based tackifying resin (B) having a softening point of 100° C.
  • the (meth)acrylic copolymer (A) comprises an alkyl (meth)acrylic acid ester having an alkyl group having less than 8 carbon atoms, an alkyl (meth)acrylic acid ester having an alkyl group having 8 or more carbon atoms, and an acidic It is a copolymer of a monomer component containing a group-containing monomer.
  • This pressure-sensitive adhesive composition contains, with respect to 100 parts by mass of (meth)acrylic copolymer (A), a rosin-based tackifying resin (B) of more than 16 parts by mass and less than 30 parts by mass, a cross-linking agent (C ) contains 0.01 to 5 parts by mass.
  • Patent Document 1 mentions polyolefin resins such as polypropylene and polyethylene as materials for forming a low-polar adherend for evaluating adhesiveness.
  • the present invention provides an acrylic pressure-sensitive adhesive having excellent adhesion and impact resistance to hard-to-bond adherends, and an electronic device pressure-sensitive adhesive sheet using the same.
  • This acrylic adhesive contains 100 parts by weight of an acrylic copolymer having a molecular weight distribution (Mw/Mn) of 8 to 23 and 15 to 25 parts by weight of a tackifying resin having a softening point of 140° C. or lower.
  • a "difficult-to-bond adherend” is defined as an adherend whose material is a non-polar resin or an adherend whose surface has been subjected to a non-polar surface treatment.
  • examples of such materials include fluorine-coated materials for oil repellency or water repellency, polyethylene, polypropylene, and the like.
  • Patent Document 3 provides a pressure-sensitive adhesive composition for difficult-to-adhere adherends that strongly adheres to difficult-to-adhere adherends and has high holding power.
  • This adhesive composition is an acrylic resin obtained by copolymerizing a copolymer component (a) containing a terminal carboxy group-containing monomer (a1) and (meth)acrylic acid (a2) represented by the following general formula (1): Contains (A).
  • the hard-to-adhere adherend in Prior Art Document 3 is one of engineering plastics with excellent heat resistance and mechanical properties, and rotating objects such as gears and bearings, grips, etc. It does not contain POM (polyacetal), which is used for parts that require durability such as hooks and covers, and musical instruments.
  • POM polyacetal
  • the pressure-sensitive adhesive used when attaching a decorative sheet such as wallpaper to a wall material or panel is required to have sufficient adhesive strength and to be able to be reapplied and reapplied, and has so-called tackiness.
  • the present invention provides a pressure-sensitive adhesive composition that has high adhesive strength, tackiness, reworkability, and does not impair dimensional stability after the application process.
  • This adhesive composition contains an acrylic resin copolymer in which n-butyl acrylate, a carboxyl group-containing monomer, and a hydroxy group-containing monomer are polymerized.
  • the proportion of n-butyl acrylate in 100 parts by weight of the acrylic resin copolymer is 20 parts by weight or more, and the proportion of the hydroxyl group-containing monomer is 0.05 to 5.0 parts by weight.
  • This acrylic resin copolymer has an acid value of 40 to 80 mgKOH/g, a mass average molecular weight of 200,000 to 500,000, and a degree of dispersion (Mw/Mn) of 2.0 or less.
  • Patent Document 4 with respect to the materials of the wall materials, panels, and decorative sheets to which the pressure-sensitive adhesive composition is applied, aluminum, stainless steel, plasterboard, galvanized steel sheets, resin-coated steel sheets, etc., are used as materials for the wall materials and panels. Examples of materials include vinyl chloride, polyethylene terephthalate, and olefin.
  • Patent Document 5 in order to fix the display screen housing-LCD-top panel of portable electronic devices such as smartphones and tablet terminals, which are becoming larger and thinner, the repulsive force of the FPC can be endured from the inside.
  • the adhesive composition described in Patent Document 5 contains an acrylic copolymer (A), a cross-linking agent (B), a silane coupling agent (C), and an antioxidant (D).
  • the acrylic copolymer (A) contains 10 to 20% by mass of (meth)acrylic acid alkyl ester (A1) having an alkyl group having 1 to 3 carbon atoms and an alkyl group having 4 to 12 carbon atoms.
  • the acrylic copolymer (A) is obtained by polymerization using a peroxide polymerization initiator, and has a weight average molecular weight of 950,000 to 2,000,000 and a theoretical Tg of -55°C or lower.
  • Patent Documents 1 to 5 do not mention or suggest any examination of adhesiveness of adhesives to adherends made of hard-to-adhere engineering plastics such as POM. Furthermore, Patent Document 4 does not mention the holding power of the pressure-sensitive adhesive to a low-polar adherend. Moreover, Patent Document 5 does not consider the tackiness of the adhesive. Therefore, in the present invention, by improving the adhesiveness based on the characteristics including tackiness of the surface of the adhesive layer compared to the conventional adhesive tape, the adhesiveness is improved even for difficult-to-adhere resins such as POM.
  • An object of the present invention is to provide an acrylic pressure-sensitive adhesive composition and a pressure-sensitive adhesive tape which are excellent in high temperature retention, load resistance and impact resistance.
  • a further object of the present invention is the adhesiveness, high temperature retention, load resistance, and impact resistance that have been developed assuming fixing of portable electronic devices such as smartphones and tablet terminals, automobile sensors, drive recorders, etc.
  • the adhesiveness is improved due to the characteristics including tackiness, and the resin materials used with the practical use of 5G, especially for difficult-to-adhesive resins such as POM.
  • POM difficult-to-adhesive resins
  • the present inventors found that by using an acrylic copolymer selected in consideration of adhesiveness based on properties including tack as a resin component of a pressure-sensitive adhesive composition, An acrylic pressure-sensitive adhesive composition that can obtain good adhesion even to difficult-to-adhere adherends made of low-polarity resins such as POM, and has excellent high-temperature retention, load resistance, and impact resistance. New knowledge was obtained that it is possible to provide a product and an adhesive tape using the same. The present inventors completed the present invention based on such new findings.
  • the acrylic copolymer (A) has a weight average molecular weight of 650,000 or more and 1,200,000 or less, and Tg' of 273K or more and 437K or less in all monomer components of the acrylic copolymer (A) (when the monomer is homopolymerized
  • the content of the monomer (A HTg ) having a glass transition temperature of 11.5% by mass or more, Assuming that a is the theoretical glass transition temperature (theoretical Tg) of the acrylic copolymer (A), b is the weight average molecular weight ( ⁇ 10 4 ), and c is the content of the monomer (A HTg ) in all the monomer components, the following Formula (1):
  • the adhesion index represented by is 1.5 ⁇ 10 -2 or more and 2.0 ⁇ 10 -2 or less, Adhesive composition.
  • the monomer component of the acrylic copolymer (A) is a (meth)acrylic acid alkyl ester (A1) having an alkyl group having 4 to 12 carbon atoms, and an alkyl group having 1 to 3 carbon atoms.
  • the adhesive composition according to any one of [1] to [3], comprising a (meth) acrylic acid alkyl ester (A2) having a carboxyl group-containing monomer (A3) and a hydroxyl group-containing monomer (A4).
  • the monomer component of the acrylic copolymer (A) is 50% by mass of (meth)acrylic acid alkyl ester (A1) having an alkyl group having 4 or more and 12 or less carbon atoms in 100% by mass of the total monomer components.
  • the present invention is excellent in adhesiveness, high temperature retention, load resistance, and impact resistance, which has been developed assuming fixing of portable electronic devices such as smartphones and tablet terminals, automobile sensors, drive recorders, etc.
  • acrylic pressure-sensitive adhesive compositions and pressure-sensitive adhesive tapes the adhesiveness is improved due to the characteristics including tackiness, and the resin materials used with the practical use of 5G, especially sticking to difficult-to-adhesive resins such as POM. It is possible to provide a pressure-sensitive adhesive composition and a pressure-sensitive adhesive tape with excellent adhesion.
  • FIG. 1(A) to 1(C) are diagrams schematically showing the layer structure of one embodiment of the pressure-sensitive adhesive tape according to the present invention.
  • FIG. (a) is a diagram schematically showing the planar shape of a test sample used for evaluation of impact resistance
  • (b) is a diagram schematically showing the configuration of a test apparatus used for evaluation of impact resistance. is. It is a schematic diagram for demonstrating the load-bearing evaluation method.
  • the pressure-sensitive adhesive composition of the present invention contains an acrylic copolymer (A) and a cross-linking agent (B).
  • the adhesive layer of the adhesive tape can be formed in a state in which the acrylic copolymer (A) is cured with the crosslinking agent (B).
  • an acrylic copolymer having a tackiness index defined by the following formula (1) of 1.5 ⁇ 10 ⁇ 2 or more and 2.0 ⁇ 10 ⁇ 2 or less is used. .
  • Important properties that affect the adhesiveness of pressure-sensitive adhesives include high-temperature retention, load resistance, impact resistance, adhesive strength, tackiness, and the like.
  • theoretical Tg affects compatibility with adherends affected by tack and ease of application
  • weight average molecular weight affects high temperature retention
  • proportion of high Tg'monomer affects adhesive strength. .
  • These factors do not necessarily mean that the larger the better, or the smaller the better, and there are appropriate values depending on the adherend to which the intended adhesiveness is to be expressed.
  • each factor is complicatedly intertwined and finally expressed as adhesiveness, and it is not easy to consider them individually. Therefore, in the present invention, the concept of "adhesion index” is introduced as an index that can simply and effectively comprehensively evaluate the adhesiveness expressed by these three factors.
  • the "stickiness index” is expressed as the reciprocal of the cube root of the product of the above three factors. When this value is low, properties such as high holding power, high adhesive strength, and low tack tend to be exhibited, and when this value is high, properties such as low holding power, low adhesive strength, and high tack tend to be exhibited.
  • a pressure-sensitive adhesive that has the above properties in a well-balanced manner, exhibits good adhesiveness, and can be suitably applied to adherends made of POM or the like that are difficult to tacky. It becomes possible to provide a composition and an adhesive tape.
  • the theoretical Tg of the acrylic copolymer (A) can be obtained by a conventional method using the FOX formula, as described in Patent Document 3.
  • the theoretical Tg of the acrylic copolymer (A) is preferably 223K (-50°C) or less, more preferably 213K or more and 203K or less (-60 to -70°C).
  • the weight-average molecular weight of the acrylic copolymer (A) is such that adhesion, high-temperature retention, load resistance and impact resistance are well balanced, and it is also suitable for difficult-to-adhere resins such as POM. 650,000 or more and 1,200,000 or less are preferable, and 700,000 or more and 1,100,000 or less are more preferable from a viewpoint of obtaining good stickiness.
  • the acrylic copolymer (A) is formed by copolymerization of a monomer component composed of a plurality of different monomers, mainly using (meth)acrylic groups.
  • a monomer component composed of a plurality of different monomers, mainly using (meth)acrylic groups.
  • an acrylic copolymer having a carboxyl group and a hydroxyl group is preferred.
  • the monomer component as a constituent component of the polymer chain of the acrylic copolymer having a carboxyl group and a hydroxyl group preferably contains each of the following monomers.
  • - (Meth)acrylic acid alkyl ester (A1) having an alkyl group having 4 or more and 12 or less carbon atoms hereinafter also referred to as "component (A1)"
  • component (A2) having an alkyl group having 1 to 3 carbon atoms
  • component (A2) Carboxyl group-containing monomer (A3) (hereinafter also referred to as component “(A3)”) - Hydroxyl group-containing monomer (A4) (hereinafter also referred to as "component (A4))
  • the monomer component of the acrylic copolymer is - A vinyl compound (A5) (hereinafter also referred to as “component (A5)” other than components (A1) to (A4) may include
  • (meth)acryl is a generic term for acryl and methacryl.
  • Component (A1) is a (meth)acrylic acid alkyl ester having an alkyl group having 4 to 12 carbon atoms.
  • Specific examples include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, isobutyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, octyl (meth) acrylate, isooctyl (Meth)acrylate, isononyl (meth)acrylate, lauryl (meth)acrylate. These may be used in combination of two or more. Among these, 2-ethylhexyl (meth)acrylate and isooctyl (meth)acrylate are preferred.
  • Component (A2) is a (meth)acrylic acid alkyl ester having an alkyl group having 1 to 3 carbon atoms.
  • Specific examples include methyl (meth)acrylate, ethyl (meth)acrylate, and propyl (meth)acrylate. These may be used in combination of two or more. Among these, methyl (meth)acrylate and ethyl (meth)acrylate are preferred.
  • Component (A3) is a component that mainly contributes to improvement of high-temperature retention and load resistance by providing an appropriate proportion of carboxyl groups to the acrylic copolymer (A).
  • Specific examples include acrylic acid, methacrylic acid, itaconic acid, crotonic acid, maleic acid, fumaric acid, 2-carboxy-1-butene, 2-carboxy-1-pentene, 2-carboxy-1-hexene, 2-carboxy -1-heptene. These may be used in combination of two or more. Among these, acrylic acid and methacrylic acid are preferred.
  • Component (A4) is a component that mainly contributes to improvement of sticking property and holding property by providing an appropriate proportion of hydroxyl groups to the acrylic copolymer (A).
  • Specific examples include 2-hydroxyethyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, and 4-hydroxybutyl (meth)acrylate. These may be used in combination of two or more. Among these, 2-hydroxyethyl (meth)acrylate and 4-hydroxybutyl (meth)acrylate are preferred.
  • the component (monomer unit) of the acrylic copolymer (A), that is, the content of the component (A1) in 100% by mass of the total monomer components is preferably 50% by mass or more and 90% by mass or less, more preferably 70% by mass. % by mass or more and 90% by mass or less
  • the content of component (A2) is preferably 3% by mass or more and 10% by mass or less, more preferably 3% by mass or more and 7% by mass or less
  • the content of component (A3) is preferably 1 % by mass or more and 10% by mass or less, more preferably 5% by mass or more and 8% by mass or less
  • the content of component (A4) is preferably 0.1% by mass or more and 0.5% by mass or less, more preferably 0.1% by mass % or more and 0.2 mass % or less.
  • the total content of component (A3) and component (A4) is preferably 10.5% by mass or less in all monomer components.
  • the monomer component of the acrylic copolymer (A) is a monomer (A5) other than the components (A1) to (A4) (hereinafter, also referred to as "component (A5)") within a range that does not impair the effects of the present invention. ) may be further included.
  • Component (A5) includes vinyl compounds other than components (A1) to (A4) exemplified as monomers (A HTg ) having a Tg' within a specific range described later, Polymerizable monomers may be mentioned.
  • the proportion of component (A5) in all monomer components is preferably 0% by mass or more and 10% by mass or less.
  • the monomer component of the acrylic copolymer (A) contains a monomer (A HTg ) having a Tg′ within a specific range of 273K or more and 437 or less.
  • the monomer (A HTg ) can be contained in the monomer component as at least one of the components (A1) to (A5) described above.
  • the monomer (A HTg ) is contained in the monomer components of the acrylic copolymer (A) as at least one component of the components (A1) to (A4)
  • a HTg ) content ratio (%) is used as “c” in formula (1).
  • the sum of these content ratios is used as "c".
  • the monomer (A HTg ) is contained in the monomer component of the acrylic copolymer (A) as at least component (A5) among components (A1) to (A5), in components (A1) to (A5) is used as "c” in formula ( 1 ).
  • the sum of these content ratios is used as "c".
  • the content of the monomer (A HTg ) contained in all the monomer components of the acrylic copolymer (A) is preferably 11.5% by mass or more, and is 11.5% by mass or more and 50% by mass or less. is more preferred.
  • Examples of the monomer (A HTg ) having a Tg′ of 273K or more and 437K or less include monomers having a (co)polymerizable vinyl group that can be copolymerized with other monomers.
  • vinyl compounds having Tg' in the above specific range, acrylonitrile (Tg': 378K), vinyl acetate (Tg': 305K), etc. can be mentioned, and at least one selected from these can be used.
  • Vinyl compounds having a (meth)acryloyloxy group include (meth)acrylic acid and (meth)acrylic acid alkyl esters represented by the following formula (2) and having a Tg' within the above specific range, and the following: and a di(meth)acrylic acid alkyl ester having a Tg' within the above specific range.
  • R1 represents a hydrogen atom or a methyl group
  • R2 represents a hydrogen atom or an optionally substituted alkyl group.
  • alkyl group for R 2 include alkyl groups having 1 to 20 carbon atoms.
  • Alkyl groups may be linear, branched or cyclic.
  • linear and branched alkyl groups include alkyl groups having 1 to 4 carbon atoms such as methyl group, ethyl group, n-butyl group, iso-butyl group and tert-butyl group.
  • Examples of the cyclic alkyl group include cyclic alkyl groups having 6 to 10 carbon atoms such as cyclohexyl group and isobornyl group.
  • One or more hydrogen atoms of this alkyl group may be substituted with another group.
  • Substituents of the alkyl group include hydroxyl group, aryloxy group such as phenyloxy group, aryl group such as phenyl group, epoxy group, aliphatic heterocyclic compound residue such as tetrahydrofuryl group, amino group (-R 3 R 4 : R 3 and R 4 each independently represent an alkyl group having 1 or 2 carbon atoms).
  • the number of carbon atoms in the substituted alkyl group is preferably 1 or more and 3 or less.
  • vinyl compound represented by formula (2) examples include: methyl (meth)acrylate (Tg': 281K or 378K), ethyl methacrylate (Tg': 338), n-butyl methacrylate (Tg': 293), isobutyl methacrylate (Tg': 321), n-stearyl (meth)acrylate (Tg': 303 or 311), tert-butyl (meth)acrylate (Tg': 314 or 380K), cyclohexyl (meth)acrylate (Tg': 288 or 339K), isobornyl (meth)acrylate (Tg': 367 or 453K), benzyl (meth)acrylate (Tg': 279K or 327K), 2-hydroxyethyl methacrylate (Tg': 328K), 2-hydroxypropyl methacrylate (Tg': 299), (meth)acrylate (Tg': 379K or
  • R5 and R6 each independently represent a hydrogen atom or a methyl group, and R7 represents an alkylene group having 4 to 10 carbon atoms.
  • R 5 and R 6 in formula (3) are preferably the same group.
  • Specific examples of the vinyl compound represented by formula (3) include: neopentyl glycol di(meth)acrylate (Tg': 390K or 305.5K), 3-methyl-1,5 pentanediol diacrylate (Tg': 378K), 1,6-hexanediol diacrylate (Tg': 336K), 1,9-nonanediol diacrylate (Tg': 341K) etc. can be mentioned.
  • Examples of vinyl compounds having a (meth)acryloylamide group include compounds represented by the following formula (4) and having Tg' within the above specific range.
  • R 8 represents a hydrogen atom or an alkyl group
  • R 9 represents an amino group
  • R 10 and R 11 are each independently a hydrogen atom or an alkyl group having 1 to 3 carbon atoms and R 10 and R 11 may combine to form an aliphatic heterocyclic compound residue such as a morpholinyl group).
  • Specific examples of the vinyl compound represented by formula (4) include: acryloylmorpholine (Tg': 418K), N,N-dimethylacrylamide (Tg': 119K), N,N-diethylacrylamide (Tg': 354K), N-isopropylacrylamide (Tg': 407K) etc. can be mentioned.
  • the Tg' of a monomer is the glass transition temperature measured by a standard method using a homopolymer obtained by homopolymerization of the monomer.
  • a value measured by a differential scanning calorimeter (DSC) according to JIS K7121-1987 or JIS K6240, or a catalog value can be used as the Tg' of the monomer.
  • a monomer that gives Tg′ in the above-described specific range for use in the present invention may be selected and used as the monomer (A HTg ).
  • the value of Tg' is shown in parentheses next to the above compound as a reference value for selecting the monomer (A HTg ).
  • the adhesive force acts more strongly than the ease of sticking to the adherend (tack). (stick index lower than 1.5), but the adhesion is increased.
  • the ease of sticking to the adherend (tack) acts more strongly than the adhesive force. sexuality increases. However, if the tackiness index is too high, the holding power will decrease and the adhesion will not be exhibited, so it is necessary to adjust it to an appropriate value.
  • various acrylic copolymers are compared with respect to POM properties and adhesive indices, and adhesiveness, high temperature retention, load resistance, and impact resistance are obtained even for difficult-to-adhere resins such as POM. It has been found that an appropriate adhesion index for excellent properties is 1.5 ⁇ 10 ⁇ 2 or more and 2.0 ⁇ 10 ⁇ 2 or less.
  • An acrylic copolymer (A) was found as an excellent acrylic copolymer.
  • the weight average molecular weight of the acrylic copolymer is 650,000 or more and 1,200,000 or less
  • the content of the monomer (A HTg ) in the total monomer components is 11.5% by mass or more
  • the adhesion index is The desired effect is obtained by selecting and combining the ranges of
  • the adhesion index of the acrylic copolymer in each synthesis example of Patent Document 1 is in the range of 1.18 to 1.48 and in the range of 2.30 to 3.62.
  • Patent Documents 2 and 3 disclose acrylic copolymers whose adhesion index satisfies the above range, these acrylic copolymers satisfy the above-mentioned three requirements ("weight average molecular weight No acrylic copolymer is disclosed that simultaneously satisfies the "range”, “content ratio of monomer (A HTg ) in all monomer components” and “adhesion index range”.
  • the tack index of the polymer ranges from 2.22 to 2.90.
  • crosslinking agent examples include isocyanate-based cross-linking agents, epoxy-based cross-linking agents, melamine-based cross-linking agents, peroxide-based cross-linking agents, urea-based cross-linking agents, metal alkoxide-based cross-linking agents, metal chelate-based cross-linking agents, and metal salts.
  • cross-linking agents carbodiimide-based cross-linking agents, oxazoline-based cross-linking agents, aziridine-based cross-linking agents, amine-based cross-linking agents, and the like.
  • an isocyanate cross-linking agent an epoxy cross-linking agent or a metal chelate cross-linking agent is preferable.
  • isocyanate-based cross-linking agents include lower aliphatic polyisocyanates such as butylene diisocyanate and hexamethylene diisocyanate; alicyclic isocyanates such as cyclopentylene diisocyanate, cyclohexylene diisocyanate and isophorone diisocyanate; Aromatic isocyanates such as diisocyanate, 4,4'-diphenylmethane diisocyanate, and xylylene diisocyanate; trimethylolpropane/tolylene diisocyanate trimer adduct (manufactured by Nippon Polyurethane Industry Co., Ltd., trade name "Coronate L”), trimethylol Isocyanates such as propane/hexamethylene diisocyanate trimer adduct (manufactured by
  • the content of the isocyanate-based cross-linking agent is typically 0.1 parts by mass or more and 20 parts by mass or less, more preferably 0.5 parts by mass or more, relative to 100 parts by mass of the acrylic copolymer (A). It is 10 parts by mass or less.
  • epoxy-based cross-linking agents examples include N,N,N',N'-tetraglycidyl-m-xylenediamine, diglycidylaniline, 1,3-bis(N,N-diglycidylaminomethyl)cyclohexane (Mitsubishi Gas Kagaku Co., Ltd., trade name “Tetrad C”), N,N,N′,N′-tetraglycidyl-m-xylylenediamine (Mitsubishi Gas Chemical Co., Ltd., trade name “Tetrad X”), 1,6-hexane Diol diglycidyl ether (manufactured by Kyoeisha Chemical Co., Ltd., trade name "Epolite 1600”), neopentyl glycol diglycidyl ether (manufactured by Kyoeisha Chemical Co., Ltd., trade name "Epolite 1500NP”), ethylene glycol diglycidyl ether (manufactured
  • the content of the epoxy-based cross-linking agent is 0.01 parts by mass or more and 10 parts by mass or less, more preferably 0.03 parts by mass or more and 5 parts by mass or less with respect to 100 parts by mass of the acrylic copolymer (A).
  • metal chelate-based cross-linking agents for example, metal chelate compounds whose metal atoms are aluminum, zirconium, titanium, zinc, iron, tin and the like can be used. Among them, an aluminum chelate compound or a titanium chelate compound is preferable.
  • aluminum chelate compounds include diisopropoxyaluminum monooleyl acetoacetate, monoisopropoxyaluminum bisoleyl acetoacetate, monoisopropoxyaluminum monooleate monoethylacetoacetate, diisopropoxyaluminum monolaurylacetoacetate, diisopropoxy Aluminum monostearylacetoacetate, diisopropoxyaluminum monoisostearylacetoacetate, monoisopropoxyaluminum mono-N-lauroyl- ⁇ -alanate monolaurylacetoacetate, aluminum tris(acetylacetonate), acetylacetonate aluminum bis(ethyl acetoacetate), monoacetylacetonate aluminum bis(isobutylacetoacetate) chelate, monoacetylacetonate aluminum bis(2-ethylhexylacetoacetate) chelate, monoacetylacetonate aluminum bis(dodecylacetoa
  • Titanium chelate compounds include, for example, titanium diisopropoxybis(acetylacetonate), titanium tetra-n-butyrate, titanium tetra-2-ethylhexanoate, titanium tetraacetylacetonate, titanium diisopropoxybis(ethylacetonate acetate), titanium octylene glycolate, and the like.
  • Other metal chelate compounds include zirconium tetraacetylacetonate and zirconium tributoxymonoacetylacetonate.
  • One of the above metal chelate-based cross-linking agents may be used alone, or two or more thereof may be used in combination.
  • the content of the metal chelate-based cross-linking agent is typically 0.01 parts by mass or more and 10 parts by mass or less, more preferably 0.03 parts by mass, relative to 100 parts by mass of the acrylic copolymer (A). 7 parts by mass or less, more preferably 0.05 parts by mass or more and 5 parts by mass or less.
  • the acrylic copolymer (A) is obtained by copolymerizing each monomer described above.
  • the polymerization method is not particularly limited, radical solution polymerization or radical emulsion polymerization is preferable from the viewpoint of ease of polymer design.
  • an acrylic syrup consisting of the acrylic copolymer (A) and its monomers may be first prepared, and the acrylic syrup may be blended with a cross-linking agent and an additional photopolymerization initiator and polymerized.
  • tackifier A tackifier (C) may be added to the pressure-sensitive adhesive composition as necessary for the purpose of adjusting the adhesive strength and the like.
  • tackifiers include tackifying resins such as rosin-based resins, terpene-based resins, petroleum-based resins, alkylphenol resins, xylene-based resins, and other resins. These may be used in combination of two or more. Among these, rosin-based resins and xylene-based resins are particularly preferred.
  • the softening point of the tackifier is preferably 125°C or higher, more preferably 135°C or higher. This softening point is a value measured according to JIS K 2531 (ring and ball method).
  • rosin-based resins include hydrogenated resins, disproportionated resins, polymerized ester resins, and the like.
  • Terpene-based resins include terpene-phenolic resins, ⁇ -pinene-based resins, ⁇ -pinene-based resins, and the like.
  • Examples of petroleum resins include aliphatic resins and aromatic resins.
  • the ratio of the tackifier (C) to 100 parts by mass of the acrylic copolymer (A) is preferably 0 parts by mass or more and 15 parts by mass or less, more preferably 0 parts by mass or more and 12 parts by mass or less. . If the added amount of the tackifier is more than 15 parts by mass, the high-temperature retention may deteriorate.
  • the lower limit of the content is not particularly limited and can be set appropriately, but it can be 1 part by mass or more with respect to 100 parts by mass of the acrylic copolymer (A).
  • the pressure-sensitive adhesive composition of the present invention may further contain at least one of various additives such as inorganic fillers, light-shielding fillers and pigments.
  • the ratio of the filler or pigment to 100 parts by mass of the acrylic copolymer (A) can be selected from the range of 0.1 parts by mass or more and 100 parts by mass or less.
  • specific examples of inorganic fillers include silica, calcium carbonate, and alumina.
  • Specific examples of light-shielding fillers include carbon black, carbon nanotubes, and black inorganic fillers.
  • pigments include carbon black, aniline black, acetylene black, and ketjen black.
  • the pressure-sensitive adhesive tape of the present invention has a pressure-sensitive adhesive layer containing the pressure-sensitive adhesive composition described above.
  • the adhesive tape has a so-called “baseless type” in which the form at the time of use consists only of an adhesive layer, or has an adhesive layer on at least one surface of a substrate, and the substrate and the adhesive layer are integrated. It can be provided as a form for use in 1(a) to 1(c) are diagrams showing an embodiment of the adhesive tape according to the present invention.
  • the adhesive tape shown in FIG. 1(a) is a single-sided adhesive tape, and has an adhesive layer 2 formed from the adhesive composition according to the present invention on the upper surface (side A) of a tape-shaped substrate 1. As shown in FIG.
  • the adhesive tape shown in FIG. 1(b) is a double-sided adhesive tape, and adhesive layers 2-1 and 2-2 are provided on both sides (upper surface: A surface and lower surface: B surface) of a tape-shaped base material 1. At least one of the two pressure-sensitive adhesive layers consists of a pressure-sensitive adhesive layer formed from the pressure-sensitive adhesive composition according to the present invention.
  • the adhesive tape shown in FIG. 1(c) is a baseless type adhesive tape, and consists of an adhesive layer 2 only. These adhesive tapes can be produced by known methods. As a typical method, a method of uniformly applying an adhesive composition onto a support for forming an adhesive layer and causing a cross-linking reaction to form an adhesive layer can be mentioned.
  • the adhesive layer can be directly formed on the substrate by using the substrate 1 shown in FIGS. 1(a) and 1(b) for forming the adhesive layer.
  • the pressure-sensitive adhesive layer formed on the support for forming the pressure-sensitive adhesive layer is transferred onto the substrate 1 shown in FIGS. -2 can also be formed.
  • a pressure-sensitive adhesive tape can be produced efficiently by using a sheet-like support for forming the pressure-sensitive adhesive layer and cutting the pressure-sensitive adhesive layer formed on the support into desired tape shapes. .
  • the baseless type pressure-sensitive adhesive tape shown in FIG. 1(c) can be obtained by transferring a pressure-sensitive adhesive layer formed on a support onto a release liner.
  • a release paper, a plastic film having a release surface, or the like can be used as a support for transfer.
  • a cross-linking reaction by heating and/or ultraviolet irradiation can be used for the cross-linking reaction of the pressure-sensitive adhesive composition on the support for forming the pressure-sensitive adhesive layer.
  • Surface A of the base material 1 in FIG. 1(a) can be subjected to surface treatment such as corona discharge treatment, provided with an undercoat layer, or both, if necessary. Thereby, the adhesiveness of the pressure-sensitive adhesive layer 2 to the substrate 1 can be improved.
  • a release layer can be provided on side B of the substrate 1 in FIG. 1(a), if necessary. This prevents the adhesive layer 2 from being transferred to the surface B of the substrate 1 when the adhesive tape is wound into a roll, and maintains ease of rewinding.
  • At least one of the A side and the B side of the substrate 1 in FIG. 1(b) can be subjected to surface treatment such as corona discharge treatment, provided with an undercoat layer, or both.
  • the thickness of the adhesive layer is preferably 5 ⁇ m or more and 100 ⁇ m or less, more preferably 10 ⁇ m or more and 80 ⁇ m or less.
  • Materials constituting the base material 1 include, for example, plastic films, metal foils, papers, woven fabrics, non-woven fabrics, and foams. These may be used in combination of two or more.
  • the constituent materials of the plastic film for the substrate include polyether ether ketone (PEEK), polyimide (PI), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), biaxially oriented polypropylene (OPP), polyphenylide ( PPS) and the like. Urethane, polyethylene (PE), polypropylene (PP), and the like can be given as the constituent material of the foam.
  • Example 1 the monomer composition and degree of polymerization were adjusted so that the adhesion index was 1.5 ⁇ 10 ⁇ 2 or more and 2.0 ⁇ 10 ⁇ 2 or less.
  • Comparative Example 1 the monomer composition and degree of polymerization were adjusted so that the adhesion index was 2.0 ⁇ 10 ⁇ 2 or more.
  • Comparative Examples 2 to 5 the monomer composition and degree of polymerization were adjusted so that the adhesion index was 1.5 ⁇ 10 ⁇ 2 or less.
  • an infrared heater was set to have an effective temperature of 105° C. or more and 110° C. or less to carry out a cross-linking reaction for 2 minutes to form an adhesive layer.
  • This pressure-sensitive adhesive layer was attached to both sides of a 0.15 mm-thick polyolefin material sheet substrate that had been subjected to corona discharge treatment. Then, it was cured at 40° C. for 3 days to obtain a double-sided adhesive tape having an adhesive layer with a thickness of 0.05 mm.
  • the numerical value attached to each component in the table is the compounding amount (part), and the compound name of each component is as follows. ⁇ “Coronate L”: isocyanate-based cross-linking agent (manufactured by Nippon Polyurethane Co., Ltd., trade name Coronate L)
  • the evaluation is ⁇ or higher without zipping.
  • FIG. 2(b) schematically shows the outline of the testing machine. In FIG.
  • the sample 6 and the adherends 5 and 7 are shown as cross-sectional views in the thickness direction.
  • a jig 4 of 100 g is attached, and a weight 3 of 200 g is placed on the lower adherend (glass plate) from each height of 100 mm, 125 mm, 150 mm, 175 mm, . Drop 3 times each until 7 drops.
  • the adherend is a combination of perforated PC plate (manufactured by Takiron C.I., PC1600) (thickness 4 mm ⁇ width 50 mm ⁇ height 100 mm (center 40 mm ⁇ 40 mm square window excluded) 5 and glass plate 7 (manufactured by Asahi Glass Co., Ltd., FL2) (thickness 1.9 mm ⁇ width 50 mm ⁇ length 60 mm) and set so that the glass plate 7 side faces downward. Impact resistance was evaluated according to the following criteria based on the height of the weight when the adherend was dropped.
  • Tack Tack was measured using a test method based on JIS Z 0237. In addition, the inclination angle was set to 10°. Based on the measured values, the tack was evaluated according to the following criteria. ⁇ : Less than 5 ⁇ : 5 or more and less than 10 ⁇ : 10 or more and less than 15 ⁇ : 15 or more In this evaluation criteria, it is preferable that the evaluation result is ⁇ or more.
  • load resistance Regarding load resistance, as shown in FIG.
  • an L-shaped jig 9 (25 g) made of SUS304 is attached to an adherend (POM plate) with an adhesive tape 8 (10 mm ⁇ 10 mm; base material 8a, adhesive layer 8b). or a polycarbonate plate), allowed to stand at 90° C., and measured the time until it fell. Based on the measured values, load resistance, which is an index of high temperature retention, was evaluated according to the following criteria. ⁇ : Less than 5 minutes ⁇ : 5 minutes or more and less than 10 minutes ⁇ : 10 minutes or more In this evaluation criteria, it is preferable that the evaluation result is ⁇ or more.
  • the pressure-sensitive adhesive composition of the present invention is a resin material suitable for 5G used in portable electronic devices, automotive sensors, and recorders as mobile communication systems become 5G, especially difficult adhesion such as POM. It is useful as a pressure-sensitive adhesive composition or pressure-sensitive adhesive tape for sticking to such materials or fixing members using such materials.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Adhesive Tapes (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
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EP21934977.6A EP4317347A4 (en) 2021-03-31 2021-03-31 PRESSURE-SENSITIVE ADHESIVE COMPOSITION AND PRESSURE-SENSITIVE ADHESIVE TAPE
JP2023510088A JP7671841B2 (ja) 2021-03-31 2021-03-31 粘着剤組成物及び粘着テープ
US18/552,654 US20240174899A1 (en) 2021-03-31 2021-03-31 Pressure-sensitive adhesive composition and pressure-sensitive adhesive tape
CN202180096632.0A CN117120570A (zh) 2021-03-31 2021-03-31 粘着剂组合物和粘着带
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