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Thermally foamable repeelable acrylic pressure-sensitive adhesive tape or sheet

A re-peelable, heated foaming technology, applied in the direction of adhesive heating, pressure-sensitive film/sheet, adhesive type, etc., can solve the problem of difficult to meet the normal adhesive strength and easy peeling force.

Inactive Publication Date: 2009-09-16
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to satisfy both excellent normal-state adhesive strength and easy-peeling force after heating

Method used

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  • Thermally foamable repeelable acrylic pressure-sensitive adhesive tape or sheet
  • Thermally foamable repeelable acrylic pressure-sensitive adhesive tape or sheet
  • Thermally foamable repeelable acrylic pressure-sensitive adhesive tape or sheet

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0207] In the four-necked flask, 94 parts by weight of 2-ethylhexyl acrylate, 6 parts by weight of acrylic acid, and 0.05 parts by weight of photoinitiator ("Irgacure 184", trade name, produced by Ciba Specialty Chemicals Corp.) and 0.05 parts by weight of a photoinitiator ("Irgacure 651", trade name, produced by Ciba Specialty Chemicals Corp.), and photopolymerized by exposing to ultraviolet rays in a nitrogen atmosphere, thereby obtaining a partially polymerized monomer with a conversion rate of 7%. body pulp.

[0208] To 100 parts by weight of the partially polymerized monomer syrup, 30 parts by weight of thermal blowing agent ("Matsumoto Microsphere F-50", trade name, produced by Matsumoto Yushi-Seiyaku Co., Ltd.) and 0.2 parts by weight trimethylolpropane triacrylate, these are uniformly mixed to obtain a heat blowing agent-containing pressure-sensitive adhesive composition (sometimes referred to as heat blowing agent-containing pressure-sensitive adhesive composition (A)...

preparation example 2

[0210] In the four-necked flask, 94 parts by weight of 2-ethylhexyl acrylate, 6 parts by weight of acrylic acid, and 0.05 parts by weight of photoinitiator ("Irgacure 184", trade name, produced by Ciba Specialty Chemicals Corp.) and 0.05 parts by weight of a photoinitiator ("Irgacure 651", trade name, produced by Ciba Specialty Chemicals Corp.), was photopolymerized by exposure to ultraviolet light in a nitrogen atmosphere, thereby obtaining a partially polymerized monomer with a conversion rate of 7%. pulp.

[0211] To 100 parts by weight of the partially polymerized monomer syrup, 30 parts by weight of a thermal foaming agent ("Matsumoto Microsphere F-50", trade name, produced by Matsumoto Yushi-Seiyaku Co., Ltd.) and 0.5 parts by weight of trimethylolpropane triacrylate, and these were uniformly mixed to obtain a heat blowing agent-containing pressure-sensitive adhesive composition (sometimes referred to as heat blowing agent-containing pressure-sensitive adhesive compositi...

preparation example 3

[0213] In the four-necked flask, 92 parts by weight of 2-ethylhexyl acrylate, 8 parts by weight of acrylic acid, and 0.05 parts by weight of photoinitiator ("Irgacure 184", trade name, produced by Ciba Specialty Chemicals Corp.) and 0.05 parts by weight of a photoinitiator ("Irgacure 651", trade name, produced by Ciba Specialty Chemicals Corp.), and photopolymerized by exposing to ultraviolet rays in a nitrogen atmosphere, thereby obtaining a partially polymerized monomer with a conversion rate of 7%. body pulp.

[0214] To 100 parts by weight of the partially polymerized monomer syrup, 30 parts by weight of a thermal foaming agent ("Matsumoto Microsphere F-50", trade name, produced by Matsumoto Yushi-Seiyaku Co., Ltd.) and 0.2 parts by weight of trimethylolpropane triacrylate, and these were uniformly mixed to obtain a heat blowing agent-containing pressure-sensitive adhesive composition (sometimes referred to as heat blowing agent-containing pressure-sensitive adhesive compo...

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Abstract

The present invention relates to a thermally-foamable re-releasable acrylic pressure-sensitive adhesive tape or sheet including a microparticle-containing viscoelastic substrate and a thermal foaming agent-containing pressure-sensitive adhesive layer provided on at least one surface of the microparticle-containing viscoelastic substrate. The thermally-foamable re-releasable acrylic pressure-sensitive adhesive tape or sheet of the present invention can be easily separated or disassembled at the separation or disassembling of the bonded part while maintaining a high normal-state adhesive strength at the bonding.

Description

technical field [0001] The present invention relates to a heat-foaming type re-peelable acrylic pressure-sensitive adhesive tape or sheet which reduces the adhesive strength by heating at the time of peeling while maintaining high normal-state adhesive strength at the time of bonding. Background technique [0002] Generally, base polymers for acrylic pressure sensitive adhesives have been prepared by solution polymerization of acrylic monomers mainly comprising alkyl (meth)acrylates. In recent years, restrictions on air pollution or environmental problems have become a subject, and in consideration of the global environment, pressure-sensitive adhesive layers are formed without solvents by ultraviolet polymerization of acrylic monomers to produce pressure-sensitive adhesive tapes or sheets ( Hereinafter, "tape or sheet" is sometimes simply referred to as "tape" or "sheet"), which is particularly advantageous from the aspects of safety and the environment. In addition, recen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/02B32B27/00B32B27/30C09J11/02C09J133/08C09J7/22C09J7/38
CPCC09J5/06C09J7/0246C09J2205/302C09J2201/606C09J133/06C09J2433/00C09J133/08C09J7/38C09J7/22Y10T428/249971Y10T428/249983C09J2301/502C09J2301/302C09J11/00
Inventor 长崎国夫平尾昭
Owner NITTO DENKO CORP
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