Photographic element with pyrazole electron donors

Details Photographic element with pyrazole electron donors Photographic element with pyrazole electron donors

1982-03-08

1983-10-04

Schilling, Richard L.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430218, 430440, 430443, 430483, 430959, G03C 140, G03C 530, G03C 554

Patent

active

044079419

ABSTRACT:
A photographic element comprising a support provided thereon with at least one light-sensitive silver halide emulsion layer containing a nondiffusible compound which receives at least one electron in an alkaline condition to release a photographically useful material and a nondiffusible electron donor or a precursor thereof having the following formula (I) or (II): ##STR1## wherein R.sup.1 represents hydrogen, an alkyl, an aryl or a heterocyclic group, R.sup.2 represents hydrogen, an alkyl, an aryl, a heterocyclic, an amino, a carbamide, a sulfonamide, a sulfamoyl, a carbamoyl or a ureido group, R.sup.3 and R.sup.4 each is hydrogen, --COR.sup.5, --SO.sub.2 R.sup.6 or --CSR.sup.7 wherein R.sup.5 and R.sup.6 each is a substituted or unsubstituted, respectively, alkyl, alkenyl, aryl, heterocyclic, alkylamino, alkyloxy, aryloxy, alkylthio, arylthio, alkyloxycarbonyl or aryloxycarbonyl group, and R.sup.7 is a substituted or unsubstituted alkyllamino or arylamino group, said R.sup.4 being allowed to form a ring together with said R.sup.1.

REFERENCES:
patent: 4139379 (1979-02-01), Chasman et al.
patent: 4266002 (1981-05-01), McCreary et al.
patent: 4310612 (1982-01-01), Mooberry et al.

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