Silver halide photographic material comprising pyridinium carbam

Details Silver halide photographic material comprising pyridinium carbam Silver halide photographic material comprising pyridinium carbam

1995-09-21

1997-03-04

Wright, Lee C.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430623, 430642, G03C 1035, G03C 130

Patent

active

056078277

ABSTRACT:
The present invention relates to a silver halide photographic material comprising a support and at least one silver halide emulsion layer coated thereon, wherein said silver halide photographic material comprises tabular silver halide grains having an average aspect ratio higher than 3:1 dispersed in highly deionized gelatin, and a pyridinium carbamoyl hardener having the following formula: ##STR1## wherein R.sub.1 and R.sub.2 each independently represents an alkyl group having from 1 to carbon atoms, an aryl group having from 6 to 15 carbon atoms, an aralkyl group having from 7 to 15 carbon atoms, or R.sub.1 and R.sub.2 together form the atoms required to complete a heterocyclic ring, R.sub.3 represents a hydrogen atom, a halogen atom, an alkyl group having from 1 to 10 carbon atoms, an alkoxy group having from 1 to 10 carbon atoms, a carbamoyl group, a ureido group, and R.sub.4 represents an alkylene group having from 1 to 4 carbon atoms or a single chemical bond.

REFERENCES:
patent: 4063952 (1977-12-01), Himmelmann et al.
patent: 4973547 (1990-11-01), Schmidt
"Photographic Silver Halide Emulsions, Preparations, Addenda, Processing and Systems," Research Disclosure, Dec., 1989, pp. 993-1015.

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