| abstract |
PURPOSE:To form a high contrast negative image having high sensitivity by incorporating specified acylhydrazines. CONSTITUTION:Acylhydrazines represented by formula I as a nucleus forming agent are incorporated into the photographic emulsion layer or other hydrophilic colloidal layer of the titled sensitive material. In the formula, each of A1 and A2 is H, one of A1 and A2 may be a sulfinic acid residue or the like, R1 is H, alkyl, aryl or the like, G is carbonyl, sulfonyl, phosphoryl or the like, L1 is arylene having Y1 as a substituent, L2 is a bivalent combining group, X1 is a group accelerating adsorption on silver halide, Y1 is a substituent dissociable to an anion having >=6pKa or the like and m=0 or 1. A concrete example of the compds. represented by the formula I may be represented by formula II. When the compds. are combined with a negative type emulsion, a high contrast sensitive material is obtd. When the compds. are combined with an internal latent image type emulsion, a sensitive material ensuring superior reversal characteristics is obtd. |