Patent ID: 6110645
Filing Date: 2000-08-29
Classification: B41C,Y10S

Abstract:
A method of making a lithographic printing plate comprising:I) providing an element comprisinga) a support web,b) a coextensive ink receptive photothermal conversion layer coated on said web andc) a coextensive ink repellant layer comprising a crosslinked polymeric matrix containing a colloid of an oxide or a hydroxide of a metal selected from the group consisting of beryllium, magnesium, aluminum, silicon, gadolinium, germanium, arsenic, indium, tin, antimony, tellurium, lead, bismuth, a transition metal, and combinations thereof; wherein the crosslinked polymeric matrix is derived from a crosslinking agent which is an alkoxy silane, an alkyl titanate, an alkyl zirconate or an alkyl aluminate; and wherein the ink repellent layer contains less than 5% hydrocarbon groups by weight, and,II) exposing the element to a laser beam having an intensity greater than 0.1 mW/.mu..sup.2 for a time sufficient to give a total exposure of 200 mJ/cm.sup.2 or greater.