Internal latent image type direct positive silver halide emulsio

Details Internal latent image type direct positive silver halide emulsio Internal latent image type direct positive silver halide emulsio

1987-08-06

1989-09-05

Michl, Paul R.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430567, 430603, 430604, 430605, 430940, 430943, G03C 108, G03C 1485

Patent

active

048638455

ABSTRACT:
In an internal latent image type direct positive silver halide emulsion containing core/shell type silver halide grains wherein at least light-sensitive sites of the silver halide internal core which has been subjected to doping with metal ions or chemical sensitization, or both, is covered with a silver halide outer shell, the improvement wherein a photographic additive which is adsorbed on silver halide in said emulsion or interacts with silver ion, said additive being a compound which functions to change the crystal form or particle size of the silver halide grains in the case of the formation thereof or acts as a sensitizer or a sensitizing assistant in the case of chemically sensitizing the core particles but has a harmful influence on photographic properties if it remains after use of it, is deactivated by a deactivator prior to completion of the formation of said core/shell type silver halide grains or completion of surface chemical ripening of said grains. A process for producing the above internal latent image type direct positive silver halide emulsion is also disclosed.

REFERENCES:
patent: 1573596 (1926-02-01), Wall et al.
patent: 1574944 (1926-03-01), Sheppard
patent: 2618556 (1952-11-01), Hewitson et al.
patent: 3574628 (1971-04-01), Jones
patent: 3672900 (1972-06-01), Kurz
patent: 3697281 (1972-10-01), Milton
patent: 3761276 (1973-09-01), Evans
patent: 3957490 (1976-05-01), Libeer et al.
patent: 4332887 (1982-06-01), Gerber
patent: 4395478 (1983-07-01), Hoyen
patent: 4444874 (1984-04-01), Silverman et al.
patent: 4665017 (1987-05-01), Mifune et al.
Research Disclosure 17643, Dec. 1978.

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