Patent ID: 7829261

Claim:
Process for the production of a lithographic printing plate comprising (a) providing a lithographic substrate; (b) applying at least one radiation-sensitive composition onto the substrate provided in step (a) and drying; (c) image-wise irradiating the lithographic printing plate precursor obtained in step (b); (d) removing the non-image areas from the image-wise exposed precursor by means of a developer solution; (e) treating the lithographic printing plate obtained in step (d) with a solution comprising a hydrophilic copolymer comprising structural units derived from the following compounds: (i) a compound comprising both polyalkylene oxide chains and at least one structural unit which is free-radical polymerizable, wherein the compound (i) is at least one compound selected from the group consisting of Poly(ethylene glycol) methacrylate, poly(ethylene glycol) acrylate, poly(propylene glycol) methacrylate, poly(propylene glycol) acrylate, monoesters of acrylic acid or methacrylic acid with block copolymers of ethylene oxide and/or propylene oxide, the reaction product of 2,4-toluene diisocyanate-terminated polyethylene glycol, polypropylene glycol, block copolymer of polyethylene glycol and polypropylene glycol or statistical poly(ethylene glycol-propylene glycol) copolymer with hydroxyalkyl acrylate or methacrylate or allyl alcohol, the monoreaction product of isocyanatoalkyl acrylate or methacrylate with polyethylene glycol, polypropylene glycol, block copolymer of polyethylene glycol and polypropylene glycol or statistical poly(ethylene glycol-propylene glycol) copolymer, and ester or ether derivatives of poly(alkylene glycol) acrylate and methacrylate and (ii) a monomer capable of copolymerizing with the free-radical polymerizable structural unit of (i) and furthermore comprising at least one acidic functional group with pK s <5, wherein the acidic functional group can be present as a free acid group or in the form of a salt; (f) drying.