Patent ID: 8105755

Claim:
Method of producing an imaged lithographic printing plate comprising: (a) imagewise exposing a negative working lithographic printing plate precursor comprising (i) a substrate with a hydrophilic surface (ii) a free-radical polymerizable coating and (iii) an oxygen-impermeable water-soluble or dispersible overcoat to radiation for which the free-radical polymerizable coating is sensitive, (b) treating the imagewise exposed precursor with an aqueous alkaline processing liquid comprising (i) water (ii) at least one surfactant (iii) at least one water-soluble film forming hydrophilic polymer (iv) at least one alkaline reagent in an amount sufficient for obtaining a pH of 9.5 to 14 and (v) optionally one or more additives selected from organic solvents, biocides, complexing agents, buffer substances, filter dyes, antifoaming agents, anticorrosive agents and radical inhibitors, (c) removing any excess of processing liquid from the treated precursor obtained in step (b), (d) optionally drying, (e) optionally baking, (f) mounting the precursor obtained in step (c), (d) or (e) on a press and then contacting it either simultaneously or subsequently with fountain solution and printing ink, with the proviso that there is no washing step between any of steps (a) to (f), with the further proviso that step (c) is not a washing step and with the further proviso that after step (b) there is no gumming step.