Spectrally sensitized silver halide photographic emulsion

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

1974-08-16

1976-04-27

Brown, J. Travis

Gas separation: apparatus

Solid sorbent apparatus

Plural solid sorbent beds

G03C 114

Patent

active

039532160

ABSTRACT:
A spectral-sensitized silver halide photographic emulsion containing in supersensitizing amounts the combination of
1. at least one sensitizing dye represented by the formula ##EQU1## WHEREIN Z.sub.1 and Z.sub.2 are the atomic groups necessary for forming a benzoxazole ring or a napthoxazole ring, in which a benzene nucleus of the ring may be substituted; R.sub.1 and R.sub.2 are aliphatic groups and at least one of R.sub.1 or R.sub.2 is a carboxyalkyl group or a sulfoalkyl group; R.sub.3 is a hydrogen atom or an alkyl group; X is an acid anion group; and m is 1 or 2 and m is 1 when the dye forms an intramolecular salt having a betaine like-structure,
2. at least one sensitizing dye represented by the formula (II) ##EQU2## wherein Z.sub.3 is an atomic group necessary for forming a 5-membered or 6-membered heterocyclic ring which may be substituted by substituents other than R.sub.4 ; Z.sub.4 is an atomic group necessary for forming a 2-pyrazoline-5-one ring nucleus which may be substituted; R.sub.4 is an aliphatic group; R.sub.5 is a hydrogen atom, an alkyl group, or an aryl group; and n is 1 or 2.

REFERENCES:
patent: 2977229 (1961-03-01), Jones
patent: 3671260 (1972-06-01), Oftedahl et al.
patent: 3822136 (1974-07-01), Sakazume et al.

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