PURPOSE: To improve the stability with lapse of time when this compsn. in used for a planographic printing plate and to lessen the decoloration of images by using an acidic dye as a coloring agent.
CONSTITUTION: This compsn. is formed by incorporating an alkaline-soluble or swellable and film formable polymer (A), a diazo resin (B) and a coloring agent into the compsn. The acid dye is used for the coloring agent. A triphenyl methane acidic dye is preferably used for the acidic dye. Further, an addition polymerizable ethylenic unsatd. compd. and a photopolymn. initiator may be preferably incorporated therein. A polymer of the formula, etc., are usable for the component A and the hexafluorophosphate of the condensation product of 4-diazodiphenyl amine and parafomaldehyde is usable for the component B.
FUJII KEIICHI
SHIGEMITSU YASURO
OE KOJI
