Patent ID: 7205084
Filing Date: 2007-04-17
Classification: B41C,Y10S

Abstract:
1. A positive-working heat-sensitive lithographic printing plate precursor comprising a support having a hydrophilic surface or which is provided with a hydrophilic layer and an oleophilic coating provided on the support, said coating comprising an infrared light-to-heat converter and an alkali-soluble phenolic resin, wherein the phenyl group of the phenolic monomeric unit of said phenolic resin is (a) chemically modified with an organic substituent comprising a group having the chemical structure of Formula I: wherein n is 0, 1, 2 or 3, wherein each R wherein R wherein R or wherein at least two groups selected from each R or wherein R or (b) substituted with a group having the structure —N═N—O, wherein the —N═N— group is covalently bound to a carbon atom of the phenyl group and wherein O is an aromatic group, wherein said coating further comprises a polymeric development accelerator, and wherein said polymeric development accelerator is a phenolic formaldehyde resin comprising at least 70 mol % of meta-cresol as a recurring monomeric unit.