Silver halide photographic emulsion and a process for the prepar

Details Silver halide photographic emulsion and a process for the prepar Silver halide photographic emulsion and a process for the prepar

1986-02-03

1987-08-11

Goodrow, John L.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430567, G03C 102

Patent

active

046861785

ABSTRACT:
A process for preparing a monodisperse core/shell type silver halide photographic emulsion comprising silver halide grains wherein the average silver iodide content in the grains is 0.5 to 10 mole % and each of the grains comprises a core portion having no silver iodide. The silver halide grains are caused to grow from seed crystals having substantially no twin crystal by supplying silver ions and halide ions in the presence of protective colloid. The supplying speeds of silver ions and halide ions are gradually increased as the grains grow and the supply of iodide ions in the halide ions is made before the completion of supply of silver ions. The content of ammonia contained in liquid phase emulsion is fixed to the value that is 0.3 normal or more and pAg is fixed to the value that is less than 8 for the supply of iodide ions.

REFERENCES:
patent: 3761276 (1973-09-01), Evans
patent: 3963493 (1976-06-01), Vanassche et al.
patent: 4070190 (1978-01-01), Friedrich et al.
patent: 4284717 (1981-08-01), Toya et al.
patent: 4335199 (1982-06-01), Mickewich et al.
patent: 4395478 (1983-07-01), Hoyen
patent: 4444877 (1984-04-01), Koitabashi et al.

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