Claims
- 1. A photopolymerizable adhesive comprising:
- (A) an acrylic resin having groups represented by at least one of the formulae: --COOH, --OH and --NHCH.sub.2 OR (wherein R represents a hydrogen atom or an alkyl group having 1-4 carbon atoms), a number average molecular weight of 3,000 to 200,000 and a glass transition temperature of at least 70.degree. C.;
- (B) a photopolymerizable oligomer mixture containing at least one member selected from the group consisting of (i) (a+c), (ii) (b+c) or (iii) (a+b+c) where a is an acrylate or a methacrylate of a novolak epoxy resin, b is an acrylate or a methacrylate of a bisphenol epoxy resin and c is a urethane acrylate of an aromatic divalent alcohol or a cycloaliphatic divalent alcohol, said urethane acrylate having at least four urethane bonds per molecule of urethane acrylate;
- and
- (C) a photoinitiator capable of discharging radicals by the action of activation energy rays.
- 2. An adhesive according to claim 1, wherein said acrylic resin has --NHCH.sub.2 OR group (wherein R represents a hydrogen atom or an alkyl group having one to four carbon atoms).
- 3. An adhesive according to claim 1, wherein said photopolymerizable oligomer mixture is an oligomer mixture including acrylic acid ester or methacrylic acid ester of novolak epoxy resin and urethane acrylate of aromatic divalent alcohol or cycloaliphatic divalent alcohol.
- 4. A photopolymerizable adhesive comprising:
- (A) an acrylic resin having groups represented by at least one of the formulae: --COOH, --OH and --NHCH.sub.2 OR (wherein R represents a hydrogen atom or an alkyl group having 1-4 carbon atoms), a number average molecular weight of 3,000 to 200,000 and a glass transition temperature of at least 70.degree. C.;
- (B) a photopolymerizable oligomer mixture containing at least one member selected from the group consisting of (i) (a+c), (ii) (b+c) or (iii) (a+b+c) where a is an acrylate or a methacrylate of a novolak epoxy resin, b is an acrylate or a methacrylate of a bisphenol epoxy resin and c is a urethane acrylate represented by the formula M(DI-AL).sub.n DI-M, wherein M is an acrylic monomer having a hydroxyl group, DI is a diisocyanate group, AL is a cycloaliphatic or aromatic divalent alcohol and n is a positive integer; and
- (C) a photoinitiator capable of discharging radicals by the action of activation energy rays.
- 5. An adhesive according to claim 4, wherein said acrylic resin has --NHCH.sub.2 OR group (wherein R represents a hydrogen atom or an alkyl group having one to four carbon atoms).
- 6. An adhesive according to claim 4, wherein said photopolymerizable oligomer mixture is an oligomer mixture including acrylic acid ester or methacrylic acid ester of novolak epoxy resin and the urethane acrylate.
Priority Claims (1)
Number |
Date |
Country |
Kind |
1-322751 |
Dec 1989 |
JPX |
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Parent Case Info
This application is a continuation of application Ser. No. 08/020,453 filed Feb. 22, 1993, now abandoned which is a continuation of application Ser. No. 07/627,304 filed Dec. 14, 1990, now abandoned.
US Referenced Citations (21)
Foreign Referenced Citations (5)
Number |
Date |
Country |
54-56847 |
May 1979 |
JPX |
59-123670 |
Jul 1984 |
JPX |
59-138461 |
Aug 1984 |
JPX |
60-71260 |
Apr 1985 |
JPX |
2158777 |
Nov 1985 |
GBX |
Continuations (2)
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Number |
Date |
Country |
Parent |
20453 |
Feb 1993 |
|
Parent |
627304 |
Dec 1990 |
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