Patent ID: 7674571

Claim:
A method of processing a lithographic printing plate comprising in order: (a) providing a lithographic printing plate comprising on a substrate a photosensitive layer comprising a polymeric binder, a urethane monomer having at least 3 (meth)acrylate groups, a non-urethane monomer having at least 3 (meth)acrylate groups, a hexaarylbiimidazole compound, and a sensitizing dye; wherein said photosensitive layer exhibits an affinity or aversion substantially opposite to the affinity or aversion of said substrate to at least one printing liquid selected from the group consisting of ink and an adhesive fluid for ink; (b) imagewise exposing said plate with a laser having a wavelength of from 250 to 430 nm at a dosage of less than 1000 μJ/cm 2 cause hardening of the photosensitive layer in the exposed areas; and (c) developing said exposed plate to remove the non-hardened areas of said photosensitive layer.