Abstract: A lithographic printing plate for use on a printing press, with minimal or no additional processing after exposure to actinic radiation, comprises a printing plate substrate, a polymeric resist layer capable of imagewise photodegradation or photohardening, and a plurality of microencapsulated developers capable of blanket-wise promoting the washing out of either exposed or unexposed areas of the polymeric resist. The microencapsulated developers may be integrated into the polymeric resist layer, or may form a separate layer deposited atop the polymeric resist layer, or may be coated onto a separate sheet support capable of being brought into face-to-face contact with conventional printing plates.
Type:
Grant
Filed:
November 1, 1993
Date of Patent:
May 14, 1996
Assignee:
Polaroid Corporation
Inventors:
Chieh-Min Cheng, Anthony C. Giudice, John M. Hardin, Rong-Chang Liang, Leonard C. Wan