Patent ID: 6953652
Filing Date: 2005-10-11
Classification: B41C,B41M,Y10S

Abstract:
1. A heat-sensitive lithographic printing plate precursor comprising a support having a hydrophilic surface and a coating provided on the hydrophilic surface, said coating comprising in the order given a first layer containing an oleophilic resin soluble in an aqueous alkaline developer and a second layer capable of preventing penetration of the developer at unexposed areas, said second layer comprising a water-repellent compound selected from the group consisting of a polymer comprising siloxane and/or perfluoroalkyl monomeric units, and a block- or graft-copolymer comprising a poly- or oligo(alkylene oxide) and a polymer or oligomer comprising siloxane and/or perfluoroalkyl monomeric units, and wherein the alkali-solubility of said coating increases on heating and said coating comprises an infrared light absorbing dye characterised in that the infrared absorbing dye comprises at least one polysiloxane group.