PHOTOSENSITIVE COMPOSITION AND PHOTOSENSITIVE PLANOGRAPHIC PRINTING PLATE

摘要

PURPOSE:To improve the adhesion to ink, the developability and the suitability to safelight by using an o-quinonediazido compd., novolak resin and a compd. having at least one specified structural unit in the molecular structure. CONSTITUTION:An o-quinonediazido compd., novolak resin and a compd. having at least one structural unit represented by the formula (where M is a cation and n is an integer of 3-100) in the molecular structure are used to obtain a photosensitive compsn. A photosensitive planographic printing plate is produced by forming a photosensitive layer with the photosensitive compsn. The amt. of the compd. having the structural unit in the compsn. is 0.05-10wt.%. Thus, the adhesion to ink and the over-developability can be improved without deteriorating the sensitivity or under-developability.