Silver halide photographic emulsions

Details Silver halide photographic emulsions Silver halide photographic emulsions

1974-07-16

1976-04-27

Brown, J. Travis

Gas separation: apparatus

Solid sorbent apparatus

Plural solid sorbent beds

96 82, 96132, G03C 114

Patent

active

039532151

ABSTRACT:
A silver halide photographic emulsion containing in a supersensitizing amount the combination of at least one sensitizing dye represented by the general formula (I) ##SPC1##
wherein, A.sub.1, A.sub.2, A.sub.3 and A.sub.4 each represents a member selected from the group consisting of a hydrogen atom, a lower alkyl group, an alkoxy group, a halogen atom, a hydroxyl group, an aryl group, a carboxyl group, an alkoxycarbonyl group, a cyano group, a trifluoromethyl group, an amino group, an acylamide group, an acyloxyl group, an alkoxycarbonylamino group, and a carbalkoxy group; and A.sub.1 and A.sub.2 and A.sub.3 and A.sub.4 can combine to form a naphthoxazole nucleus; R.sub.o represents a hydrogen atom, a lower alkyl group or an aryl group; R.sub.1 and R.sub.2 each represents an alkyl group, provided that at least one of R.sub.1 or R.sub.2 represents a sulfoalkyl group; X.sub.1 represents an anion; and n is equal to 1 or 2 with n being equal to 1 when the sensitizing dye forms an intromolecular salt, and at least one sensitizing dye represented by the general formula (II) ##SPC2##
wherein, Z.sub.1 and Z.sub.2 each represents the non-metallic atoms necessary to form a nucleus selected from the group consisting of a thiazole nucleus, a thiazoline nucleus, an oxazole necleus, a selenazole nucleus, a 3,3-dialkylindolenine nucleus, and an imidazole nucleus; R.sub.3 and R.sub.4 each represents an alkyl group; X.sub.2 represents an anion; m is equal to 1 or 2 with m being equal to 1 when the sensitizing dye forms an intramolecular salt.

REFERENCES:
patent: 3038800 (1962-06-01), Luckey et al.
patent: 3125448 (1964-03-01), Heseltine et al.
patent: 3667960 (1972-06-01), Shiba et al.
patent: 3737313 (1973-06-01), Rosecrants et al.
patent: 3769024 (1973-10-01), Sakazume et al.

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