Patent ID: 7258964

Claim:
A method for preparing a printing plate, the method comprising providing a substrate; applying a negative-working layer comprising a radiation sensitive composition onto the substrate, wherein the radiation sensitive composition is ink receptive upon exposure to infrared imaging radiation and comprises an infrared-radiation absorber, a free radical initiator system comprising an electron acceptor and a coinitiator capable of donating electrons, donating hydrogen atoms, or forming a hydrocarbon radical, a polymerizable compound, and between about 10 and about 90 weight percent of a polymeric binder, wherein the polymeric binder comprises at least one graft copolymer comprising a main chain polymer and polyethylene oxide side chains, or a combination of said graft copolymer with a block copolymer having at least one polyethylene oxide block; imagewise exposing the negative-working layer to infrared radiation; and developing the negative-working layer on a press by contacting with ink and/or fountain solution to produce a printing plate, wherein the method does not comprise a separate development step.