Direct-positive silver halide photographic material

Details Direct-positive silver halide photographic material Direct-positive silver halide photographic material

1983-04-21

1985-01-22

Louie, Won H.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Identified backing or protective layer containing

430597, 430596, 430605, 430608, 430606, 430599, 430607, 430614, 430611, 430940, G03C 136

Patent

active

044952740

ABSTRACT:
Direct positive silver halide photographic materials comprising a support, a silver halide emulsion layer comprising fogged silver halide particles prepared in the presence of a water soluble iridium salt or a water soluble rhodium salt, and a hydrophilic colloidal layer comprising (a) a compound selected from Formula I and II and (b) at least one compound selected from the group consisting of Formula III and a gold compound, said Formula I being ##STR1## wherein R.sub.1 is hydrogen, alkyl, --SO.sub.3 M, or --COOM, wherein M is selected from hydrogen, alkali metals, and ammonium, and R.sub.2 is selected from hydrogen and lower alkyls, said Formula II being ##STR2## wherein R.sub.3 is selected from hydrogen, alkyl, --SO.sub.3 M, and --COOM, and R.sub.4 is selected from hydrogen, alkyl, and --CH.sub.2 --S--(CH.sub.2).sub.n --Y', wherein n is an integer of from 1 to 3, and Y' is selected from hydrogen and --SO.sub.3 M, and said Formula III being

REFERENCES:
patent: 3062651 (1962-11-01), Hillson
patent: 3672903 (1972-06-01), Chang
patent: 3865596 (1975-02-01), Furuya et al.
patent: 3942986 (1976-03-01), Florens

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