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Adhesive sheet

A technology of adhesive sheets and adhesive layers, applied in the direction of adhesives, adhesive types, pressure-sensitive films/sheets, etc., to achieve the effect of excellent reworkability

Active Publication Date: 2021-10-26
TERAOKA SEISAKUSHO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, there is still room for further improvement in conventional adhesive sheets that can be peeled off by stretching in terms of properties such as no residue remaining and no sheet breakage during peeling.

Method used

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  • Adhesive sheet

Examples

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Effect test

Embodiment 1～2 and comparative example 1～2

[0057] The above-mentioned polyurethane resin composition was applied to one side of a release paper with a silicone release agent formed on both sides, and dried at 50° C. for 2 minutes + 100° C. for 2 minutes to remove the solvent to obtain a resin substrate (thickness 70 μm).

[0058] The above-mentioned acrylic pressure-sensitive adhesive composition was applied to a release paper with silicone release treatment on both sides, and dried to form an pressure-sensitive adhesive layer. Then, this adhesive layer is bonded to a base material. Furthermore, the pressure-sensitive adhesive layer was bonded to the opposite surface in the same manner. Thereafter, aging was carried out at 40° C. for 3 days to complete the curing reaction of the adhesive layer, and a double-sided adhesive sheet with a thickness of about 100 μm was obtained (the thickness of each adhesive layer was about 15 μm).

[0059] For each of the adhesive sheets obtained as described above, physical properties a...

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Abstract

The present invention discloses an adhesive sheet which has an adhesive layer on one or both sides of a substrate and can be peeled off by stretching. The resin is obtained as the base polymer; the adhesive sheet is peeled off by stretching without leaving a residue and without sheet failure.

Description

technical field [0001] The present invention relates to a single-sided or double-sided pressure-sensitive adhesive sheet that can be peeled without residue or damage through a wide range of stretching in the adhesive surface. Background technique [0002] In portable electronic devices such as smartphones and mobile phones, adhesive sheets are used to fix battery packs and casings. In addition, when the battery pack is taken out, the adhesive sheet is stretched and peeled off by stretching. Adhesive sheets in such applications are required to have properties such as no residue (adhesive) remaining and no sheet breakage when peeled off. [0003] As an adhesive sheet that can be peeled off by stretching, for example, Patent Document 1 discloses a specific adhesive film sheet in which the adhesiveness of the adhesive layer disappears when the film is stretched, and Patent Document 2 discloses a film made of Adhesives composed of specific block copolymers are used for pressure...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J7/25C09J7/38C09J7/20
CPCC09J175/04C09J7/20C09J7/25C09J2475/006C09J2301/124C09J2301/312C09J2301/302
Inventor 土屋靖史雷鸣丹羽理
Owner TERAOKA SEISAKUSHO
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