Patent ID: 6902866

Claim:
A method of processing a lithographic printing plate comprising in order: (a) providing a lithographic printing plate comprising (i) a hydrophilic substrate, and (ii) an oleophilic thermosensitive layer comprising a polymeric binder, a urethane (meth)acrylate monomer having at least 6 (meth)acrylate groups, a non-urethane (meth)acrylate monomer having at least 4 (meth)acrylate groups, a free-radical initiator, and an infrared absorbing dye; wherein the weight ratio of said urethane (meth)acrylate monomer to said non-urethane (meth)acrylate monomer is from 0.10 to 3.0; and (b) exposing said plate with said infrared laser according to digital imaging information to cause hardening of the thermosensitive layer in the exposed areas.