positive working strahlungsempfindliches mixture, positive working photosensitive flachdruckplatte and methods for imaging the printing plate

摘要

A positive photosensitive composition comprising at least (a) an alkali-soluble resin and (b) a photo-thermal conversion material, which further contains (c) a compound capable of crosslinking the alkali-soluble resin by a thermal action, and which contains substantially no compound which has a function to generate an acid when exposed in the coexistence of the photo-thermal conversion material.