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Browse Prior Art Database

WATERLESS LITHOGRAPHIC MASTERS

IP.com Disclosure Number: IPCOM000023026D
Original Publication Date: 1976-Jun-30
Included in the Prior Art Database: 2004-Mar-27
Document File: 2 page(s) / 154K

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.

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Page 1 of 2

XEROX DISCLOSURE JOURNAL

WATERLESS LITHOGRAPHIC MASTERS Proposed Classification
R. G. Crystal U.S. Cl. 101/1
F. 0. Walton tnt. Cl. B4lf

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.

Volume 1 Number 6 June 1976 33

[This page contains 1 picture or other non-text object]

Page 2 of 2

34 XEROX DISCLOSURE JOURNAL

Volume 1 Number 6 June 1976

[This page contains 1 picture or other non-text object]