Silver halide photosensitive materials containing thiourea...

Details Silver halide photosensitive materials containing thiourea... Silver halide photosensitive materials containing thiourea...

G - Physics

03

C

96/100

G03C 1/10 (2006.01) C07C 335/04 (2006.01) C07C 335/08 (2006.01) G03C 1/09 (2006.01)

Patent

CA 1316743

-0- SILVER HALIDE PHOTOSENSITIVE MATERIALS CONTAINING THIOUREA AND ANALOGUE COMPOUNDS Abstract A photographic silver halide emulsion comprising a 1,1,3,3-tetrasubstituted middle chalcogen urea compound is described wherein at least one substituent comprises a nucleophilic center. The urea compound is an effective chemical sensitizing agent. A process for chemically sensitizing silver halide is also described.

544082

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