Silver halide emulsion and method of preparing the same

Details Silver halide emulsion and method of preparing the same Silver halide emulsion and method of preparing the same

1994-02-01

1995-12-05

Baxter, Janet C.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430567, G03C 1015

Patent

active

054728371

ABSTRACT:
A silver halide emulsion comprising 50% to 100% of projected area of all silver halide grains are occupied by hexagonal tabular silver halide grains which have an aspect ratio of 8 to 40, which have a ratio of the longest side to the shortest side of 1 to 2, and which have an average silver iodide content of 2 mol % to 10 mol %, and all silver halide grains have a grain size of variation coefficient of 8% to 20%. A method of preparing the emulsion described above, comprising a nucleation step and a grain-growing step and in which a dispersant used in the nucleation step is low-molecular gelatin having a molecular weight of 5,000 to 25,000, and nucleation time t (seconds) in the nucleation step satisfies the relationship of 1<t<-T+90, where T (.degree.C.) is a temperature of a reaction vessel at the time of the nucleation step.

REFERENCES:
patent: 4879208 (1989-11-01), Urabe et al.
patent: 4977074 (1990-12-01), Saitou et al.
patent: 5147771 (1992-09-01), Tsaur et al.
patent: 5250403 (1993-10-01), Antoniades et al.

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