Patent ID: 8133651

Claim:
A negative lithographic printing plate comprising (i) a substrate; and (ii) a photosensitive layer comprising an alkaline soluble polymeric binder, an alkaline insoluble polymeric binder, a polymerizable monomer, and an initiator; wherein said photosensitive layer is capable of hardening upon exposure to a radiation having a wavelength selected from 200 to 1200 nm, said alkaline soluble polymeric binder has an acid number of at least 40 mg KOH/g, and said alkaline insoluble polymeric binder has an acid number of less than 35 mg KOH/g and is selected from the group consisting of polymethylmethacrylate, a copolymer of methyl methacrylate and butyl acrylate, and a copolymer of styrene and methyl methacrylate.