Planographic printing plate material and preparing process of planographic printing plate

摘要

A planographic printing plate material including a support having thereon a photosensitive layer containing: (A) a photopolymerization initiator; (B) a polymer binder; (c) a polymerizable compound having an ethylenically unsaturated bond; and (D) an anionic dye, wherein the photopolymerization initiator is a metal-arene complex, and the anionic dye has a solubility in methyl ethyl ketone of not less than 1 weight % based on the total weight of methyl ethyl ketone.