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Pressure-sensitive adhesive sheet and electronic appliance

A technology of adhesive sheets and adhesive layers, which is applied in the direction of adhesives, film/sheet adhesives, etc., can solve the problems of water immersion and insufficient followability, etc., and achieve good followability effects

Pending Publication Date: 2020-01-07
DAINIPPON INK & CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] As a means to solve such problems, it is generally effective to increase the strength of the foam base material of the adhesive sheet, but the adhesive sheet using a high-strength foam is not good at following the steps of the adherend. Sufficient, there is a problem that it is easy to cause inundation from the outside

Method used

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  • Pressure-sensitive adhesive sheet and electronic appliance
  • Pressure-sensitive adhesive sheet and electronic appliance
  • Pressure-sensitive adhesive sheet and electronic appliance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0160] On the surface of the release liner, the above-mentioned adhesive (A1) was applied using a bar coater so that the thickness of the dried adhesive layer became 50 μm, and dried at 80° C. for 3 minutes to prepare an adhesive layer.

[0161] Next, the above-mentioned adhesive layer was attached to both sides of the foam whose wetness index was adjusted to 50 mN / m by corona treatment on the surface of the foam 1 described in Table 1, and in an environment of 40° C., An adhesive sheet was produced by curing for 48 hours.

Embodiment 2

[0163] An adhesive sheet was obtained in the same manner as in Example 1 except that foam 2 described in Table 1 was used instead of foam 1 .

Embodiment 3

[0165] An adhesive sheet was obtained in the same manner as in Example 1 except that foam 3 described in Table 1 was used instead of foam 1 .

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Abstract

The problem to be solved by the present invention is to provide a pressure-sensitive adhesive sheet that has removability which, when electronic appliances are disassembled or something, makes removalof the organic EL information display devices, etc. easy and that has satisfactory conformability to large surface irregularities of adherends. The present invention relates to a pressure-sensitive adhesive sheet which comprises a foam substrate and a pressure-sensitive adhesive layer disposed over one or both surfaces of the foam substrate directly or through another layer, wherein the foam substrate includes 30-90 mass% ethylene / vinyl acetate copolymer (EVA) and / or ethylene / acrylic acid copolymer (EAA) and the foam substrate has an apparent density of 0.20-0.60 g / cm3 and a machine-directiontensile modulus of 10-35 MPa.

Description

technical field [0001] The present invention relates to an adhesive sheet that can be used in manufacturing scenes of various articles represented by electronic devices such as car navigation systems, personal computers, televisions, and smartphones, for example. Background technique [0002] An adhesive sheet using a foam as a base material is widely used, for example, to fix two or more housings, rechargeable batteries, circuit boards, etc. constituting an electronic device. [0003] As the above-mentioned adhesive sheet, for example, an adhesive sheet using a foamed sheet as a base material is known. The foamed sheet is characterized in that it is a resin foam formed by foaming a resin composition. The ratio of 90:10 to 60:40 contains the polyolefin resin and the non-compatible resin of the polyolefin resin, and the average major diameter of the island part of the sea-island structure formed by the polyolefin resin and the non-compatible resin It is 1 μm or more (see Pat...

Claims

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Application Information

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IPC IPC(8): C09J7/26C09J201/00
CPCC09J7/26C09J201/00C09J7/22C09J2301/312C09J2301/12
Inventor 北出祐也岩崎刚高桥佑辅武井秀晃
Owner DAINIPPON INK & CHEM INC
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