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Adhesive sheet and electronic device

A technology of adhesive sheets and foams, applied in the direction of film/sheet adhesives, adhesives, etc., can solve problems that have not yet been discovered, and achieve a good follow-up effect

Active Publication Date: 2017-08-18
DIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In addition, generally speaking, there is a trade-off relationship between the followability of the step portion of the adherend and the above-mentioned impact resistance to the impact in the shear direction. Impact-resistant adhesive sheet for directional impact

Method used

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  • Adhesive sheet and electronic device
  • Adhesive sheet and electronic device
  • Adhesive sheet and electronic device

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0146] [Preparation Example 1] Production method of acrylic acid polymer (A-1)

[0147] In a reaction vessel equipped with a stirrer, a reflux condenser, a nitrogen inlet tube, and a thermometer, add 95.9 parts by mass of n-butyl acrylate, 4 parts by mass of acrylic acid, 0.1 parts by mass of 2-hydroxyethyl acrylate, and 200 parts by mass of ethyl acetate , under stirring, the temperature was raised to 72° C. while blowing nitrogen gas.

[0148] Then, 2 parts by mass (solid content: 0.1 mass%) of 2,2'-azobis(2-methylbutyronitrile) solution previously dissolved in ethyl acetate was added to the above mixture, and the mixture was kept at 72° C. for 4 hours under stirring. After 1 hour, it was kept at 75°C for 5 hours.

[0149] Then, the said mixture was filtered through the 200-mesh metal net, and the acrylic polymer (A-1) solution (33.3 mass % of non-volatile components) with a weight average molecular weight of 1.86 million was obtained.

preparation example 2

[0150] [Preparation Example 2] Production method of acrylic acid polymer (A-2)

[0151] In a reaction vessel equipped with a stirrer, a reflux condenser, a nitrogen inlet tube, and a thermometer, add 63.9 parts by mass of n-butyl acrylate, 32 parts by mass of 2-ethylhexyl acrylate, 4 parts by mass of acrylic acid, 4-hydroxybutyl acrylate 0.1 mass parts of esters and 200 mass parts of ethyl acetate were heated up to 72 degreeC, blowing in nitrogen gas, with stirring.

[0152] Then, 2 parts by mass (solid content: 0.1 mass%) of 2,2'-azobis(2-methylbutyronitrile) solution previously dissolved in ethyl acetate was added to the above mixture, and the mixture was kept at 72° C. for 4 hours under stirring. After 1 hour, it was kept at 75°C for 5 hours.

[0153] Then, the said mixture was filtered with the 200-mesh metal net, and the acrylic polymer (A-2) solution (33.3 mass % of non-volatile components) of weight average molecular weight 750,000 was obtained.

Embodiment 1

[0155] In a container, 10 parts by mass of polymerized rosin ester-based tackifying resin D-125 (manufactured by Arakawa Chemical Industry Co., Ltd.) and disproportionated rosin ester-based tackifying resin A -100 (manufactured by Arakawa Chemical Industry Co., Ltd.) 15 mass parts were mixed and stirred, and then ethyl acetate was added to obtain an adhesive composition (A) with a solid content of 31 mass%.

[0156] Then, with respect to 100 parts by mass of the above-mentioned adhesive composition (A), Burnock D-40 (manufactured by DIC Corporation, a trimethylolpropane adduct of toluene diisocyanate was added, the isocyanate group content rate was 7 mass%, and no Volatile components (40% by mass) 1.4 parts by mass were used as a crosslinking agent, stirred and mixed to make it uniform, and then filtered through a 100-mesh metal mesh to obtain an adhesive (A).

[0157] Then, the above-mentioned adhesive (A) was coated on the surface of the release liner with a bar coater so th...

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Abstract

The present invention addresses the problem of providing an adhesive sheet having a degree of impact resistance whereby even the application of a force (impact) in a shear direction does not cause breakage of a foam body or peeling from an adherend, the adhesive sheet also having good ability to follow a level difference in the adherend. The present invention relates to an adhesive sheet having an adhesive layer, directly or via another layer, on one or both surfaces of a foam body having an apparent density in the range of 0.40 g / cm<3> to 0.59 g / cm<3>, the adhesive sheet characterized in that the number of bubbles present in a distance range of 1.5 cm in the thickness * width directions of a surface (cut surface) of the foam body cut in the width direction thereof is 20 or greater.

Description

technical field [0001] The present invention relates to a pressure-sensitive adhesive sheet that can be used in the production of various articles represented by, for example, electronic equipment. Background technique [0002] The adhesive sheet which uses a foam as a base material is widely used, for example, when fixing two or more housing|casings which comprise an electronic device, a rechargeable battery, a circuit board, etc.,. [0003] As the above-mentioned pressure-sensitive adhesive sheet, for example, a pressure-sensitive adhesive sheet using a foamed sheet containing polyolefin in a ratio of 90:10 to 60:40 is known (for example, refer to Patent Document 1). A resin foam obtained by foaming a resin composition of a polyolefin-based resin and an incompatible resin with respect to the polyolefin-based resin, characterized in that the sea-island structure formed by the above-mentioned polyolefin-based resin and the incompatible resin The average major axis of the is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/02C09J7/20
CPCC09J7/20C09J2400/243C09J2203/326C09J2301/312
Inventor 北出祐也岩崎刚武井秀晃
Owner DIC CORP
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