METHOD FOR PRODUCING PLANOGRAPHIC PRINTING PLATE, PLANOGRAPHIC PRINTING ORIGINAL PLATE AND PLANOGRAPHIC PRINTING PLATE

摘要

PROBLEM TO BE SOLVED: To produce a planographic printing plate having high hydrophilic property even when a polymer film is used as the base. SOLUTION: The planographic printing plate is produced by successively carrying out a step for imagewise exposing a planographic printing original plate obtained by stacking a polymer film base, a hydrophilic layer comprising a hydrophilic polymer and a silver halide-gelatin emulsion layer in this order and allowing the polymer of the polymer film base and the hydrophilic polymer of the hydrophilic layer to covalent-bond to each other, a step for subjecting the original plate to tanning development to harden the gelatin in the exposed part and a step for leaching out the unhardened gelatin in the unexposed part to form a relief image of the hardened gelatin.