Silver halide photographic materials

Details Silver halide photographic materials Silver halide photographic materials

1992-06-19

1994-04-12

Chea, Thorl

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430576, 430581, 430583, 430587, G03C 118

Patent

active

053025067

ABSTRACT:
The improved silver halide photographic material is such that the silver halide grains contained in at least one light-sensitive silver halide emulsion layer are spectrally sensitized with a sensitizing dye represented by the following general formula: ##STR1## where R.sup.1 and R.sup.2 each represents an alkyl group having 1-10 carbon atoms or an alkenyl group having 3-10 carbon atoms; R.sup.3 represents a hydrogen atom, a heterocyclic group, an aryl group or an alkyl group; R.sup.4 and R.sup.5 each represents an alkyl group; Z.sup.1 represents the group of non-metallic atoms necessary to form a 5-membered monocyclic or condensed nitrogenous hetero ring; L.sup.1 and L.sup.2 each represents a methine group, provided that R.sup.1 or R.sup.2 may combine with L.sup.1 or L.sup.2, respectively, to form a 5- or 6- membered hereto ring; X.sup.1 represents an ion that cancels an electric charge in the molecule; .sup.1 represents the number of ions necessary to cancel electric charges in the molecule. The silver halide photographic material has an enhanced spectral sensitivity in the red wavelength range while causing less color contamination.

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