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US 4,081,572 AGranted
Preparation of hydrophilic lithographic printing masters
AssigneeXerox Corporation
InventorThomas J. Pacansky
Life of this patent
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Abstract
Hydrophilic printing masters are provided comprising coating a self-supporting master substrate with a hydrophilic polymer containing carboxylic acid functionality and selectively converting this polymer in image configuration to a hydrophobic condition by heat.
Claims9
A method for preparing a printing master comprising:
- (a) providing a self-supporting master substrate,
- (b) providing a hydrophilic polymer of the formula:
- ##STR5## wherein R' is a carbonyl group or R and R' are the same or different hydrocarbon moieties which may be acyclic, aliphatic cyclic or bicyclic or aromatic, n is an integer of 0 or 1, x and y are integers of from 0 to 2 providing that when n is 0, y is 0, and when R' is a carbonyl group, y is 0,
- (c) coating said substrate with said polymer, and
- (d) selectively thermally converting said polymer to a hydrophobic condition in image configuration.
2 more elements
Dependencies are inferred from the claim text.