Spectrally sensitized silver halide photographic emulsion

Details Spectrally sensitized silver halide photographic emulsion Spectrally sensitized silver halide photographic emulsion

1976-01-28

1977-03-01

Brown, J. Travis

Gas separation: apparatus

Electric field separation apparatus

Collecting electrode details

96124, G03C 114

Patent

active

040100375

ABSTRACT:
A silver halide photographic emulsion containing, in combination, supersensitizing amounts of at least one sensitizing dye of the following general formula (I) ##STR1## wherein Z.sub.1 and Z.sub.2 each represents an atomic group required for forming a benzimidazole ring; R.sub.1 and R.sub.2 each represents an aliphatic group and at least one of R.sub.1 and R.sub.2 represents an alkyl group having a carboxy group, a hydroxyalkyl group or an alkyl group having a sulfo group; X.sub.1 represents an acid anion; and m is 1 or 2, m being 1 when the dye forms an inner salt (a betaine-like structure) and at least one sensitizing dye of the following general formula (II) ##STR2## wherein Z.sub.3 represents an atomic group required for forming a benzoxazole ring or a .beta.-naphthoxazole ring; Z.sub.4 represents an atomic group required for forming a benzothiazole ring, a benzoselenazole ring, a .beta.-naphthothiazole ring or a .beta.-naphthoselenazole ring; R.sub.3 and R.sub.4 each represents an aliphatic group and at least one of R.sub.3 and R.sub.4 represents an alkyl group having a carboxy group or an alkyl group having a sulfo group; R.sub.5 represents a hydrogen atom or an alkyl group; X.sub.2 represents an acid anion; and n is 1 or 2, n being 1 when the dye forms an inner salt.

REFERENCES:
patent: 3348949 (1967-10-01), Bannert et al.
patent: 3856532 (1974-12-01), Thurston et al.

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