Direct positive type silver halide photographic material compris

Details Direct positive type silver halide photographic material compris Direct positive type silver halide photographic material compris

1995-01-17

1996-08-20

Baxter, Janet C.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430606, 430940, G03C 136

Patent

active

055478280

ABSTRACT:
A direct positive type silver halide photographic material is described, which contains at least one compound represented by the following formula (I) and at least one cyanine dye having a pyrazolo[5,1-b]quinazolone nucleus and a cyanine heterocycle nucleus, wherein a carbon atom at 3-position of the pyrazolo[5,1-b]quinazolone nucleus is bonded through a four-methine chain to an atom at the 2-position or 4-position of the cyanine heterocycle nucleus, provided that the 4-position is possible only when the cyanine heterocycle nucleus is a quinoline or pyridine nucleus: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 each represents an alkyl group, an aryl group or a heterocyclic group, which may be substituted; V.sub.1, V.sub.2, V.sub.3, V.sub.4, V.sub.5, V.sub.6, V.sub.7 and V.sub.8 each represents a hydrogen atom or a monovalent substituent; L.sub.1, L.sub.2 and L.sub.3 each represents a substituted or unsubstituted methine group; M.sub.1 represents a charge-neutralizing counter ion; and m.sub.1 is a number of 0 or larger necessary for intramolecular charge neutralization.

REFERENCES:
patent: 3431111 (1969-03-01), Brooker et al.
patent: 3868256 (1975-02-01), Sato et al.
patent: 5314799 (1994-05-01), Takagi

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