Patent ID: 6706463
Filing Date: 2004-03-16
Classification: B41C,Y10S

Abstract:
A method for making a lithographic printing plate, which comprises the steps of imagewise exposing, to a laser beam, a presensitized plate useful for making a lithographic printing plate comprising a substrate, a heat-sensitive layer containing at least one light-heat conversion agent and a binder polymer formed on the substrate and a hydrophilic or lipophobic layer applied onto the heat-sensitive layer; and then removing the hydrophilic or lipophobic layer on the laser-exposed area by developing the imagewise exposed printing plate within 120 seconds from the completion of the laser-exposure to thus give a lithographic printing plate, wherein the developing treatment comprises the step of rubbing the exposed printing plate surface with an abrasion means in the absence of any liquid and wherein the heat-sensitive layer is an ink-receptive layer and a part of the heat-sensitive layer on the laser-exposed area is removed together with the hydrophilic or lipophobic layer.