Patent ID: 8088558
Filing Date: 2012-01-03
Classification: B41C,G03F

Abstract:
1. A method of making a lithographic printing plate comprising the steps of: a) providing a lithographic printing plate precursor including a support having a hydrophilic surface or which is provided with a hydrophilic layer, a coating on the support including a photopolymerizable layer, optionally, an intermediate layer between the photopolymerizable layer and the support, and an adhesion promoting compound including a functional group that interacts with the support, wherein the adhesion promoting compound is in the photopolymerizable layer or the optional intermediate layer, and the photopolymerizable layer includes a polymerizable monomer or oligomer including an ethylenically unsaturated compound having at least one terminal ethylenic group, a polymerization initiator, and a reactive binder; b) image-wise exposing the coating by a laser in a plate setter; c) optionally, heating the precursor in a pre-heating unit; d) developing the precursor off-press in a gumming unit by treating the coating of the precursor with a gum solution, thereby removing the non-exposed areas of the photopolymerizable layer from the support; wherein the reactive binder is a polymer containing a monomeric unit which includes a group having an ethylenically unsaturated bond; and the gum solution has a pH-value ranging between 3 and 9.