Patent ID: 6130026
Filing Date: 2000-10-10
Classification: B41C,G03F

Abstract:
A method for preparing a waterless lithographic plate, the method comprising: (A) imagewise heating a mixture coated on an oleophilic surface of a support and forming heated areas and unheated areas of the mixture on the support; in which:(1) the mixture comprises:(a) an ink-repellant and water-repellant release material or mixture of such materials, and(b) a water-insoluble composition that is rendered aqueous developable by heat, and(2) the ratio of release material to water-insoluble composition in the mixture is from 20 to 80 release material to 80 to 20 water-insoluble composition by weight; and(B) developing the exposed mixture with an aqueous developer solution and removing the imagewise heated areas and leaving the imagewise unheated areas so as to expose the oleophilic surface of the support in the heated regions.