PHOTOSENSITIVE MATERIAL AND ITS DEVELOPING METHOD

摘要

PURPOSE:To obtain a colored positive type relief image of high density by blending polyvinyl alcohol with a diazonium salt and using an alkaline aqueous soln. contg. a coupler component as a developer. CONSTITUTION:A photosensitive composition is used contg. a 100pts.wt. water- soluble resin binder (A) contg. at least 60wt% polyvinyl alcohol having >=500 average degree of polymn. and 71-89% degree of saponification, a 5-10pts.wt. photocrosslinkable diazo resin (B) such as condensate of formalin and p-diazodiphenylamine and a 5-30pts.wt. water-soluble diazonium salt (C) such as zinc p- N-ethyl-N-hydroxyethyl-aminobenzenediazonium chloride which can form a water- insoluble dye by reaction with a coupler. The composition is developed with an alkaline aqueous soln. of the above-mentioned coupler.