Light-sensitive silver halide material for making direct-positiv

Details Light-sensitive silver halide material for making direct-positiv Light-sensitive silver halide material for making direct-positiv

1991-07-19

1992-11-24

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Identified backing or protective layer containing

430596, 430598, 430940, 430961, G03C 1485, G03C 176

Patent

active

051660431

ABSTRACT:
Photographic light-sensitive silver halide material for forming direct-positive images comprising a support, a light-sensitive emulsion layer comprising unfogged internal latent image-type silver halide grains dispersed in a hydrophilic colloid binder and comprising a development nucleator, and at least one protective hydrophilic colloid layer, wherein said light-sensitive emulsion comprises at least one compound that during the development of said material in a surface developer provides iodide ions, the weight ratio of the hydrophilic colloid binder of said emulsion layer to silver halide expressed as silver nitrate ranging from 0.4:1 to 3:1, and said protective hydrophilic colloid layer having a thickness in dry state of 1 to 3 .mu.m. The present invention also relates to a method for making direct-positive images with such a photographic light-sensitive silver halide material.

REFERENCES:
patent: 3761266 (1973-09-01), Milton
patent: 3923513 (1975-12-01), Evans
patent: 4302526 (1981-11-01), Kohmura et al.
patent: 4777113 (1988-10-01), Inoue et al.
Research Disclosure, 23510, Nov. 1983 pp. 346-352.

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