PHOTOPOLYMERIZABLE COMPOSITION FOR NEAR-INFRARED LASER EXPOSURE, PHOTOPOLYMERIZABLE PLANOGRAPHIC PRINTING PLATE, AND METHOD FOR PRODUCING PRINTING PLATE

摘要

PROBLEM TO BE SOLVED: To provide a photopolymerizable composition for a near-infrared laser, having high sensitivity and superior visible image properties. SOLUTION: In the photopolymerizable composition for near-infrared laser exposure containing (A) an ethylenically unsaturated compound, (B) a cyanine- sensitizing dye and/or a phthalocyanine-sensitizing dye having a structure, in which heterocycles are bonded to each other by way of a polymethine chain and (C) a compound, containing an organoboron anion and/or a halomethyl group, (D) 3-20 wt.% coloring dye, having absorption maximum at 450-650 nm is contained.