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WATERLESS LITHOGRAPHIC MASTERS

IP.com Disclosure Number: IPCOM000023026D
Original Publication Date: 1976-Jun-30
Included in the Prior Art Database: 2004-Mar-27

Publishing Venue

Xerox Disclosure Journal

Abstract

Masters for waterless lithography are formed by coating a mixture of a photoactive material and an abhesive silicone or other polymer such as a fluorocarbon, on a suitable ink accepting substrate and then imagewise exposing same to actinic radiation, the effect being either imagewise hardening or degrading of the member. The soft regions in either case are removed by solvation, abrasion or stripping, leaving imagewise abhesive areas on an ink accepting substrate. The mechanical properties of the abhesive images are improved by post curing the silicone gum to a silicone elastomer. Photohardening or photodegra- dation result in positive and negative sense masters, respectively.