Photographic spectral sensitizing dye

Details Photographic spectral sensitizing dye Photographic spectral sensitizing dye

1989-01-19

1990-07-10

Schilling, Richard L.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430583, 430584, 430585, 430586, 430588, 430590, 430592, 430595, G03C 119, G03C 120, G03C 114, G03C 122

Patent

active

049406574

ABSTRACT:
Disclosed is a photographic spectral sensitizing dye represented by the following formula (I), (II) or (III): ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.5 or R.sub.7 each represents an alkyl group, an aralkyl group or an alkenyl group, R.sub.4 and R.sub.6 each represents an alkyl group, aralkyl group, an alkenyl group or an aryl group, L.sub.1 -L.sub.22 each represents a methine group, Z.sub.1 -Z.sub.4 each represents a group of atoms necessary to form a 5- or 6-membered nitrogen-containing heterocyclic ring, X.sub.1.sup.- and X.sub.2.sup.- each represents an acid anion and l, m, n, p, q, r, s, t and u each represents an integer of 1 or 2.
Silver halide photographic emulsion containing the above sensitizing dye is also disclosed.

REFERENCES:
patent: 3743510 (1973-07-01), Nakazawa et al.
patent: 3769024 (1973-10-01), Sakazume et al.
patent: 4172730 (1979-10-01), Hinato et al.
patent: 4582779 (1986-04-01), Kubota et al.

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