International Paper Company

Kodak Polychrome Graphics, Gmbh

Albert B Levit

Bruce M Resnick

Rolf S Gabrielsen

Richmond C Watson

Guenther H Klinger

This subject invention relates to novel hydrazide compounds useful as dot-promoting agents in photographic image systems, methods for making them, and to photographic materials which comprise these compounds.

Hydrazides

Disclosed is a negative-working, silver halide emulsion including monodispersed, non-twinned, non-tabular silver halide crystals having a core and a shell. The core has a first halide composition including silver chloride, silver bromide or silver chlorobromide containing at least 65% silver bromide. The shell has a second halide composition, different from the first composition, including silver chloride, silver bromide or silver chlorobromide, provided that: (a) the minimum difference in shell to core halide composition relative to the same halide, is as follows: (i) 0.5 mole % when the core is silver bromide, (ii) 10 mole % when the core is silver chloride, and (iii) 10 mole % when the core is silver chlorobromide; (b) the core represents from about 5 to about 50% of the total crystal volume; and (c) the shell contains no more than 50 mole % silver chloride. The emulsion also has a chemically sensitized surface, and substantially reduced black or white pressure sensitivity compared with homogeneous silver bromide or silver chlorobromide emulsions.

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Binghamton, NY, United States of America

Albert B Levit