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Acrylic pressure-sensitive adhesive sheet

An acrylic and adhesive sheet technology, which is applied in the direction of adhesive type, ester copolymer adhesive, film/sheet adhesive, etc., can solve the problem of not having rebound resistance and difficulty in obtaining adhesive sheets and other problems, to achieve the effect of excellent adhesive properties

Inactive Publication Date: 2010-09-15
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such adhesives composed of monomers containing an acrylamide skeleton have the problem of strong adhesion to low-polarity automotive coatings but lack of rebound resistance
[0008] In addition, in the adhesive composition described in U.S. Patent No. 4364972, Japanese Patent Publication No. 58-500130, and Japanese Patent Laid-Open No. 2000-96012, regarding the durability against peeling when a certain stress is applied for a long time properties (repulsion resistance and retention), it is difficult to obtain a PSA sheet that exhibits well-balanced characteristics

Method used

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  • Acrylic pressure-sensitive adhesive sheet
  • Acrylic pressure-sensitive adhesive sheet
  • Acrylic pressure-sensitive adhesive sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0223] [Preparation of viscoelastic layer]

[0224] As a monomer component, 90 parts by weight of 2-ethylhexyl acrylate was mixed with 10 parts by weight of acrylic acid (AA), and 0.05 parts by weight of a photopolymerization initiator 2,2-dimethoxy-1 , 2-diphenylethane-1-one (trade name "Irgacure 651", produced by Ciba Japan K.K.) and 0.05 parts by weight of photopolymerization initiator 1-hydroxy-cyclohexyl-benzophenone (trade name "Irgacure 184", Ciba Japan K.K. Produced by Japan K.K.), and then irradiated with ultraviolet rays until the viscosity (measured under the conditions of BH viscometer, No.5 spindle, 10 rpm, measurement temperature: 30°C) was about 15 Pa·s, and a partially polymerized partial polymer was obtained. ("Slurry A").

[0225] Add 0.1 part by weight of 1,6-hexanediol diacrylate (HDDA) to 100 parts by weight of the above-mentioned slurry A, and then further add hollow glass spheres (trade name " Cellstar Z-27", manufactured by Tokai Kogyo Co., Ltd.). Af...

Embodiment 2

[0235] [Preparation of Adhesive Layer]

[0236] In addition to 70 parts by weight of 2-ethylhexyl acrylate (2EHA, Tg of homopolymer: -70°C), 26 parts by weight of N-diethylacrylamide (DEAA, Tg of homopolymer: 81°C) and 0.05 parts by weight of photopolymerization initiator 2,2-dimethoxy-1 was added to 100 parts by weight of monomer composition consisting of 4 parts by weight of hydroxyethylacrylamide (HEAA, Tg of homopolymer: 98°C), 2-Diphenylethan-1-one (trade name "Irgacure 651", produced by Ciba Japan K.K.) and 0.05 parts by weight of photopolymerization initiator 1-hydroxy-cyclohexyl-benzophenone (trade name "Irgacure 184", Ciba Japan Produced by K.K.), after being fully replaced with nitrogen, it was exposed to ultraviolet rays under a nitrogen atmosphere to carry out photopolymerization, thereby obtaining a partially polymerized composition (monomer slurry, slurry-like composition) with a polymerization rate of about 11% by weight; And except adding 0.05 parts by weight ...

Embodiment 3

[0240] [Preparation of Adhesive Layer]

[0241] In a reaction vessel equipped with a condenser tube, a nitrogen inlet tube, a thermometer, a dropping funnel, and a stirring blade, add 0.2 parts by weight of a polymerization initiator 2,2-azobisisobutyronitrile (AIBN), 70 parts by weight of monomer component acrylic acid 2-Ethylhexyl ester (2EHA, Tg of homopolymer: -70°C), 26 parts by weight of N-vinyl-2-pyrrolidone (NVP, Tg of homopolymer: 54°C), 4 parts by weight of hydroxyethyl Acrylamide (HEAA, Tg of homopolymer: 98° C.) and 122.5 parts by weight of ethyl acetate as a solvent were stirred for 1 hour at room temperature under a nitrogen atmosphere. Then, the contents of the reaction vessel (solution containing the entire amount of monomer components) were heated to 60° C., polymerized in a nitrogen stream for 5.5 hours, then raised to 70° C., and polymerized for another 2 hours. The solution of the acrylic polymer is obtained through the solution polymerization of the above...

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Abstract

The present invention relates to an acrylic pressure-sensitive adhesive sheet, including: a viscoelastic material layer (X) containing hollow microspheres; and a pressure-sensitive adhesive layer (Y) provided on at least one face of the viscoelastic material layer (X) and formed from a monomer composition, in which the monomer composition includes the following monomers (m1), (m2) and (m3) as essential monomer components, in which a content of the monomer (m1) is 50 to 85% by weight, a content of the monomer (m2) is 0.1 to 20% by weight, and a content of the monomer (m3) is 2 to 40% by weight, based on a total amount of monomer components constituting the monomer composition, (m1) an alkyl(meth)acrylate monomer including an alkyl group having 1 to 20 carbon atoms, which is represented by the following formula (1), [Chem. 1] CH2-C(R1)COOR2 (1) in which R1 represents a hydrogen atom or a methyl group, and R2 represents an alkyl group having 1 to 20 carbon atoms, (m2) an N-hydroxyalkyl(meth)acrylamide monomer having a hydroxyalkyl group having 1 to 4 carbon atoms, which is represented by the following formula (2), [Chem. 2] CH2-C(R3)CONHR4 (2) in which R3 represents a hydrogen atom or a methyl group, and R4 represents a hydroxyalkyl group having 1 to 4 carbon atoms, (m3) a vinyl monomer having a nitrogen atom in a backbone thereof, except for the monomer (m2).

Description

technical field [0001] The present invention relates to an acrylic pressure-sensitive adhesive sheet capable of exhibiting good adhesiveness even to a low-polarity adherend and having good properties of repulsion resistance and retention. Background technique [0002] In recent years, PSA sheets based on foams have been effectively used in various situations such as automobile applications, building materials applications, and home appliance applications. In the pressure-sensitive adhesive sheet used for the above-mentioned applications, it is required to have good adhesiveness to various adherends such as automotive coatings, metals, and plastics. A typical example of the PSA sheet includes a PSA sheet including a PSA layer formed using a PSA composition (acrylic PSA composition) having an acrylic copolymer as a base polymer. In addition, as the acrylic copolymer, it is generally possible to use an alkyl (meth)acrylate as the main body (main component), and further have a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/02C09J133/08C09J133/10C09J133/12
CPCC09J4/00C09J133/04C09J2205/106C08K7/22C09J7/0217C09J139/04C09J2205/11C09J133/26C09J7/385C09J2301/41C09J2301/412Y10T428/25
Inventor 丹羽理仁冈本昌之樋口真觉
Owner NITTO DENKO CORP
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