Patent ID: 8361701

Claim:
Method of producing an imaged lithographic printing plate comprising: (a) providing a negative working radiation sensitive lithographic plate precursor for wet offset printing comprising on a substrate at least one photosensitive layer based on radical photopolymerization and optionally an oxygen-impermeable overcoat, (b) imagewise exposing the precursor with radiation having a wavelengths from 250 to 1200 nm, and (c) developing the exposed precursor with an aqueous silicate-free, alkaline developer comprising: (i) at least one alkylene oxide derivate of formula (A) wherein R 1 is a linear or branched C1 to C6 alkyl group or H, (n+m) is an integer from 2 to 30, and R 2 , R 3 , R 4 and R 5 are each independently selected from H, methyl and ethyl, with the proviso that at least one of R 2 and R 3 is not H, and with the further proviso that at least one of R 4 and R 5 is not H; (ii) at least one component selected from alkaline components and surfactants and (iii) optionally at least one of complexing agents, buffers, defoamers, organic solvents, dyes, odorants, biocides, anticorrosive agents, dispersing agents and thickeners and wherein the developer has a pH of 8 to 13.