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Adhesive composition and adhesive sheet

A composition and adhesive technology, applied in the direction of adhesive types, polyurea/polyurethane adhesives, adhesives, etc., can solve problems such as swelling or decomposition, and reduced adhesion

Active Publication Date: 2020-10-27
DIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the case of using an acrylic adhesive composition having an ester bond such as an acryloyl group, there is a problem that swelling or decomposition occurs and the adhesive force decreases when contacted with oleic acid for a long time

Method used

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  • Adhesive composition and adhesive sheet
  • Adhesive composition and adhesive sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0073] Hereinafter, the present invention will be described in more detail using examples.

Synthetic example 1

[0075]

[0076] 1,5-pentanediol and 1,6-hexanediol-based polycarbonate polyol ("Duranol T5652" manufactured by Asahi Kasei Chemicals Co., Ltd. , number average molecular weight of 2,000, hereinafter referred to as "1,5PG / 1,6HG PC-1".) 558 parts by mass, 1,4-butanediol (hereinafter referred to as "1,4-BG") 17 Parts by mass, diphenylmethane diisocyanate (hereinafter referred to as "MDI".) 87 parts by mass, 0.7 parts by mass of triphenyl phosphite, dimethylformamide (hereinafter referred to as "DMF".) 357 parts by mass, heating to 80°C to allow it to react. After confirming that the isocyanate group content rate reached the target value, it cooled to 70 degreeC. Thereafter, 0.6 parts by mass of 1,3-butanediol was added for the purpose of deactivating the remaining isocyanate groups, heated at 70° C. for 1 hour, and cooled to obtain a solid content of 65 mass % and a viscosity of 45,000 mPa. s. A polyurethane resin (A-1) having a weight average molecular weight of 17,100.

Synthetic example 2

[0078]

[0079] 490 parts by mass of 1,5PG / 1,6HG PC-1, 15 parts by mass of 1,4-BG, 105 parts by mass of MDI, and phosphorous acid 0.7 mass parts of triphenyl esters and 610 mass parts of DMF were heated to 80 degreeC, and it was made to react. After confirming that the isocyanate group content rate reached the target value, it cooled to 70 degreeC. Thereafter, 0.6 parts by mass of 1,3-butanediol was added for the purpose of inactivating the remaining isocyanate groups, heated at 70° C. for 1 hour, and cooled to obtain a solid content of 50 mass % and a viscosity of 2,850 mPa. s. A polyurethane resin (A-2) having a weight average molecular weight of 8,200.

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Abstract

The problem to be solved by the present invention is to provide a pressure-sensitive adhesive composition capable of obtaining a pressure-sensitive adhesive sheet excellent in oleic acid resistance with little reduction in adhesive force even if it is in contact with oleic acid for a long time. The present invention provides: a kind of adhesive composition, is characterized in that, contains polyurethane resin (A) with hydroxyl group, crosslinking agent (B) and organic solvent (C), described polyurethane resin (A) with hydroxyl group is A reactant of polycarbonate polyol (a1), polyisocyanate (a2) and chain extender (a3) ​​with a weight average molecular weight in the range of 5,000 to 40,000; and an adhesive sheet, characterized in that it has the above adhesive Dry film of the agent composition. The adhesive composition of the present invention has good applicability, and the resulting adhesive sheet is oil-resistant with excellent crosslinkability, good initial adhesive force, and little decrease in adhesive force even if it is in contact with oleic acid for a long time. Adhesive sheet with excellent acidity.

Description

technical field [0001] The present invention relates to a PSA composition capable of obtaining a PSA sheet excellent in oleic acid resistance. Background technique [0002] Adhesives are widely used in various fields such as manufacturing sites of various products represented by electronic equipment and automobiles, and medical products represented by surgical tape. [0003] Among them, in recent years, in order to improve the durability of waterproof tapes for sealing the surface of portable terminals and the like that can be touched by human hands, and for bonding internal casings, it is required to develop materials with excellent resistance to oleic acid contained in sebum. [0004] As an adhesive composition aimed at improving oleic acid resistance, for example, an adhesive composition containing an acrylic copolymer having a hydroxyl group and a carboxyl group and a crosslinking agent is disclosed, wherein the acrylic acid having a hydroxyl group and a carboxyl group ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/04C09J7/30C09J11/06C09J7/25C09J7/20
CPCC09J11/06C09J175/04C09J7/20
Inventor 桥口恒则藤井友理
Owner DIC CORP