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Heat-peelable pressure-sensitive adhesive sheet

A thermal peeling, adhesive sheet technology, applied in the direction of adhesive types, ester copolymer adhesives, film/sheet adhesives, etc. The effect of excellent force and excellent peelability

Active Publication Date: 2016-08-31
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, as described in Patent Document 1, the pressure-sensitive adhesive layer containing heat-expandable microspheres (foaming agent) added in order to exhibit releasability causes the following problems: the foaming agent is Chemical deterioration occurs due to chemical solution, resulting in loss of foaming function

Method used

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Examples

Experimental program
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Effect test

manufacture example 1

[0131] [Manufacturing Example 1] Preparation of Acrylic Adhesive I(i)

[0132] 100 parts by weight of (meth)acrylic polymer (copolymer of butyl acrylate (BA) and acrylic acid (AA), structural unit derived from BA: structural unit derived from AA (weight ratio)=95:5) 0.6 parts by weight of an epoxy-based crosslinking agent (manufactured by Mitsubishi Gas Chemical Co., Ltd., trade name "TETRAD C") and a terpene-phenolic tackifier resin (manufactured by YASUHARA CHEMICAL CO., LTD., trade name "YS POLYSTAR T130") 30 parts by weight were mixed to prepare an acrylic adhesive I(i).

manufacture example 2～9

[0133] [Production Examples 2-9] Preparation of Acrylic Adhesive I(ii)-(ix)

[0134] Acrylic adhesives I(ii) to (ix) were prepared by mixing the (meth)acrylic polymers, crosslinking agents, and tackifier resins shown in Table 1 in the compounding quantities shown in Table 1.

[0135] TETRAD X: Epoxy-based crosslinking agent; manufactured by Mitsubishi Gas Chemical Co., Ltd., trade name "TETRAD X"

[0136] CORONATE L: Isocyanate-based crosslinking agent; manufactured by Nippon Polyurethane Industry Co., Ltd., trade name "CORONATE L"

[0137] SUPERESTER A-75: Rosin-based tackifier resin; manufactured by Arakawa Chemical Industry Co., Ltd., trade name "SUPERESTER A-75"

[0138] TAMANOL 200: Alkylphenol-based tackifying resin; manufactured by Arakawa Chemical Industry Co., Ltd., trade name "TAMANOL 200"

[0139] Table 1

[0140]

Embodiment 1

[0142] 130.6 parts by weight of the acrylic adhesive I (i) obtained in Production Example 1, 25 parts by weight of heat-expandable microspheres (manufactured by Matsumoto Yushi Pharmaceutical Co., Ltd., trade name "Matsumoto Microsphere F-50D"), and 210 parts by weight of toluene parts were mixed to prepare a composition (i) for forming an adhesive layer.

[0143] The composition (i) for forming an adhesive layer was coated on both sides of a PET film (manufactured by Toray Co., Ltd., trade name "Lumirror S10", thickness: 100 μm) as a base material to form a first film with a thickness of 40 μm. an adhesive layer and a second adhesive layer.

[0144] Through the above operations, a heat-peelable pressure-sensitive adhesive sheet including a first pressure-sensitive adhesive layer (40 μm), a base material (100 μm) and a second pressure-sensitive adhesive layer (40 μm) in this order was obtained.

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Abstract

The invention provides a heat-peelable pressure-sensitive adhesive sheet which is provided with an adhesive layer that can be hardly penetrated by chemical solution. The heat-peelable pressure-senstive adhesive sheet is provided with a first adhesive layer, a substrate and a second adhesive layer successively. The first adhesive layer comprises an acryloid adhesive and thermal expandable microballs. The acryloid adhesive comprises a (methyl) acrylic polymer. The (methyl) acrylic polymer comprises the components of a structural unit from methyl propiolate with an alkyl with more than two carbons, and a structural unit from (methyl) acrylic monomer with an OH group. In the (methyl) acrylic polymer, mole ratio (C / OH) between the carbons (C) of alkyls and OH groups of the side chain is 40-150.

Description

technical field [0001] The present invention relates to a heat-peelable adhesive sheet. Background technique [0002] Conventionally, when manufacturing a substrate included in an electronic device, an adhesive sheet is attached to the substrate material for protection (for example, Patent Document 1). For example, when etching copper foil as a substrate material, an adhesive sheet is attached to the copper foil in order to prevent the etchant from adhering to the non-treated surface of the copper foil. In addition, when the surface of the glass substrate is polished with an acid such as hydrofluoric acid, the adhesive sheet is attached to the non-treated surface as well. For the adhesive sheet for this purpose, when the chemical solution penetrates into the adhesive layer of the adhesive sheet, the interface between the adhesive layer and other layers, etc., the infiltrated chemical solution will be destroyed in the subsequent process after the chemical solution treatment....

Claims

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Application Information

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IPC IPC(8): C09J7/02C09J133/08C09J133/10
CPCC09J7/255C09J133/08C09J2203/326C09J7/30C09J133/066C09J2467/006C09J2433/00
Inventor 平山高正下川大辅西尾昭徳
Owner NITTO DENKO CORP
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