Claims
- 1. A process for preparing a relief image on a support material which comprises
- exposing a material which has been coated with a layer of a photopolymerizable coating agent which comprises
- (a) at least one uncured epoxy resin based on a bisphenol or a novolac and epichlorohydrin, and having an epoxide value of 0.2 to 0.5 equivalents per kg of resin and an average molecular weight of 1,000 to 10,000,
- (b) at least one uncured epoxy resin based on a bisphenol or a novolac and epichlorohydrin, and having an average molecular weight of 20,000 to 60,000, the weight ratio of a:b being from 8:1 to 3:1,
- (c) at least one light-sensitive, polyethylenically unsaturated monomer having terminal ethylene groups, and
- (d) at least one photoinitiator or at least one sensitizer or a mixture of at least one photoinitiator and at least one sensitizer, through a photomask, and then
- removing the unexposed areas by means of a developer.
- 2. A process according to claim 1 wherein the coating agent is dissolved in an organic solvent.
- 3. A process according to claim 1 wherein in the coating agent the unsaturated monomer (c) is an acrylate or methacrylate of a polyol.
- 4. A process according to claim 3 wherein the unsaturated monomer (c) is 1,1,1-trimethylolprropane triacrylate or trimethacrylate.
- 5. A process according to claim 1 where in the coating agent the weight ratio of the epoxy resins (a)+(b) to the monomer (c) ranges from 1:9 to 9:1.
- 6. A process according to claim 5 wherein the weight ratio of the epoxy resins (a)+(b) to the monomer (c) ranges from 1:9 to 7:3.
- 7. A process according to claim 1 wherein the coating agent additionally contains a hardener for the epoxy resins selected from the group consisting of dicyandiamide, polybasic carboxylic acids, anhydrides of polybasic carboxylic acids and mixtures of the said hardeners with mono-, di- or triethanolamine, alone or together with a hardening accelerator.
- 8. A process according to claim 7 wherein the coating agent additionally contains a polymer containing acid groups, as a second hardener.
- 9. A process according to claim 8 wherein the polymer has an acid value of 10 to 500 mg of KOH/g of polymer.
- 10. A process according to claim 1 wherein the relief image obtained is hardened by means of a post-heat treatment before development.
- 11. A process according to claim 1, wherein the relief image obtained is hardened by means of a post-heat treatment after development.
Priority Claims (1)
Number |
Date |
Country |
Kind |
3885-82 |
Jun 1982 |
CHX |
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Parent Case Info
This is a divisional of application Ser. No. 691,713, filed on Jan. 14, 1985, now U.S. Pat. No. 4,601,973, issued on July 22, 1986, which in turn is continuation-in-part of application Ser. No. 503,445, filed June 13, 1983, now abandoned.
US Referenced Citations (9)
Foreign Referenced Citations (2)
Number |
Date |
Country |
1448643 |
Sep 1976 |
GBX |
2032939 |
May 1980 |
GBX |
Divisions (1)
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Number |
Date |
Country |
Parent |
691713 |
Jan 1985 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
503445 |
Jun 1983 |
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