Light-sensitive imaging element

摘要

An imaging element has a light-sensitive imaging layer carried on a polyester film support. The support is coated with (i) a self-crosslinking polyurethane at coverage of 0.17g/m2 and (ii) a hydrophilic colloid layer. The polyurethane is derived from an isocyanate terminated prepolymer extended with an aliphatic polyamine and end-capped with N-methylol hydrazide gas. The prepolymer is derived from (a) a diisocyanate and (b) a polyester polyol and has pendant, water dispersing, carboxylic salt gps. on the polymer chain. Pref. the hydrophilic colloid is gelatin. The diisocyanate and polyester polyol are both aliphatic. The polyol is more pref. a deriv. of neopentyl glycol, hexanediol and adipic acid and the prepolymer contains units deriv. from melamine. The light-sensitive imaging layer contains Ag halide and is applied to the hydrophilic colloid layer. The polyester support is treated with corona discharge, UV, glow discharge or flame.