Direct positive photographic light-sensitive materials

Details Direct positive photographic light-sensitive materials Direct positive photographic light-sensitive materials

1984-05-24

1987-02-17

Louie, Won H.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430604, 430605, 430598, 430940, 430409, 430608, G03C 128

Patent

active

046439650

ABSTRACT:
A direct positive photographic light-sensitive material is described, comprising a support and at least one internal latent image type silver halide emulsion layer containing core/shell type silver halide grains which are composed of a silver halide core subjected to at least one of doping with metal ions and chemical sensitization, and a silver halide shell covering at least sensitivity sites of said core, and a binder, wherein said core/shell type silver halide grains consist of two or more kinds of grains each having a different average grain size, and the core of the core/shell type silver halide grains having a larger average grain size is doped with a larger amount of lead ions, cadmium ions, or Group VIII metal ions.

REFERENCES:
patent: 3317322 (1967-05-01), Porter et al.
patent: 3761276 (1973-09-01), Evans
patent: 4035185 (1977-07-01), Evans et al.
patent: 4395478 (1983-07-01), Hoyen
patent: 4444865 (1984-04-01), Silverman et al.

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