Positive-working light-sensitive composition, a photosensitive printing plate and a process for the preparation of a positive image

摘要

PROBLEM TO BE SOLVED: To obtain a photosensitive planographic printing plate having good sensitivity, chemical resistance and printing resistance. ;SOLUTION: In a positive type photosensitive compsn. contg. an alkali-soluble resin (a) having phenolic hydroxyl groups and a photothermic conversion material (b) but not contg. a quinonediazido compd., an alkali soluble resin (a-1) having esterified phenolic hydroxyl groups as at least part of the phenolic hydroxyl groups is contained as the alkali-soluble resin (a).;COPYRIGHT: (C)1999,JPO