Patent ID: 8119331

Claim:
Process for producing an imaged element comprising (a) image-wise exposure of a radiation-sensitive element to radiation of a wavelength adjusted to a photoinitiator or sensitizer present in the radiation-sensitive coating of the element, wherein the radiation-sensitive element is a negative-working lithographic printing plate precursor comprising an aluminum-containing substrate, and a radiation-sensitive coating comprising: at least one component selected from photoinitiators and sensitizer/coinitiator systems that absorb radiation of a wavelength in the range of 250 to 1,200 nm: and at least one free-radical polymerizable oligomer A having an average molecular weight in the range of 3,500 to 9,000 determined by GPC, obtainable by reacting a triisocyanate with (i) at least one acrylic or methacrylic monomer with two free OH groups and at least one (meth)acrylic group and (ii) at least one compound comprising one OH group, at least one (meth)acrylic group and at least one poly(alkyleneoxide) chain in the molecule, wherein the (meth)acrylic monomer (i) is present in an amount of 2 to 20 mole-%, based on the total amount of (meth)acrylic compounds with OH functionality; and (b) removing the non-exposed areas on press by means of printing ink, fountain solution, or both printing ink and fountain solution.