Claims
- 1. A thin adhesive sheet comprising a light-permeable support having provided thereon an acrylic-based pressure-sensitive adhesive layer which comprises an acryl base polymer, a crosslinking agent, a low molecular weight photopolymerizable compound and a photopolymerization initiator, wherein the low molecular weight photopolymerizable compound is present in an amount of from 1 to 100 parts by weight per 100 parts by weight of the acryl base polymer, and the photopolymerization initiator is present in an amount of from 0.1 to 5 parts by weight per 100 parts by weight of the acryl base polymer, the acrylic-based pressure-sensitive adhesive layer being formed by heating a liquid composition, wherein after said heating the photopolymerization initiator is present in the acrylic-based pressure sensitive adhesive layer until a subsequent irradiation with light, whereupon the acryl base polymer reacts with the photopolymerizable compound to form a three-dimensional network structure, wherein the cohesive force of the acrylic-based pressure-sensitive adhesive layer is increased as compared to the adhesive force of the acrylic-based pressure-sensitive adhesive layer prior to irradiation with light, whereupon the adhesiveness of the acrylic-based pressure-sensitive adhesive layer is substantially lost, said acrylic-based pressure-sensitive adhesive layer containing a gel prior to irradiation with light and a gel after irradiation with light, wherein the degree of swelling of the gel contained in the acrylic-based pressure-sensitive adhesive layer prior to irradiation with light is 35 times or less and the degree of swelling of the gel after irradiation with light is at most 18 times and the degree of swelling of the gel after irradiation with light is smaller than the degree of swelling of the gel prior to irradiation with light, wherein the light-permeable support has a thickness of from 10 to 300 .mu.m and wherein a 180.degree. peeling adhesion force prior to irradiation with light is at least 200 g/20 mm and the 180.degree. peeling adhesion force after irradiation with light is 150 g/20 mm or less.
- 2. The thin adhesive sheet as in claim 1, wherein the light-permeable support is a film made of a polyolefin resin.
- 3. The thin adhesive sheet as in claim 1, wherein the pressure-sensitive adhesive layer comprises the acrylic-based polymer, a low molecular weight compound having at least two photopolymerizable carbon--carbon double bonds in the molecule and a photopolymerization initiator.
Priority Claims (1)
Number |
Date |
Country |
Kind |
59-47743 |
Mar 1984 |
JPX |
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Parent Case Info
This is a Continuation of application Ser. No. 08/578,397 filed Dec. 26, 1995 (now abandoned), which is a Continuation of application Ser. No. 07/665,846 finded Mar. 7, 1991 (now abandoned), which is a Continuation of application Ser. No. 07/045,733 filed May 1, 1987 (now abandoned), which is a Continuation in Part of application Ser. No. 06/710,828 (now abandoned) filed Mar. 12, 1985.
US Referenced Citations (5)
Foreign Referenced Citations (2)
Number |
Date |
Country |
58-50164 |
Sep 1983 |
JPX |
59-21038 |
Feb 1984 |
JPX |
Continuations (3)
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Number |
Date |
Country |
Parent |
578397 |
Dec 1995 |
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Parent |
665846 |
Mar 1991 |
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Parent |
045733 |
May 1987 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
710828 |
Mar 1985 |
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