Patent ID: 7087359
Filing Date: 2006-08-08
Classification: B41C,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 the developer from penetrating into the first layer 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 block of poly- or oligosiloxane and/or perfluoroalkyl units and wherein the alkali-solubility of said coating increases on heating and said coating comprises an infrared light absorbing dye comprising at least one perfluoroalkyl group, wherein the infrared light absorbing dye carries a charge and at least one perfluoroalkyl group is included in a counter ion and contains at least 6 fluorine atoms.