Silver halide photographic emulsion and method for manufacture t

Details Silver halide photographic emulsion and method for manufacture t Silver halide photographic emulsion and method for manufacture t

1990-03-30

1992-02-11

Le, Hoa Van

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430569, G03C 102

Patent

active

050875558

ABSTRACT:
A silver halide photographic emulsion comprising silver halide grains is disclosed, wherein at least 60% of the total projected area of the silver halide grains is comprised of tabular silver halide grains having a central portion and an outer portion, of which the iodide content of the central portion is from 7 mol % to the solid solution limit, and which have two parallel twinned crystal planes.
A method for the manufacture of the silver halide emulsion is also disclosed, which comprises the steps of nucleating the silver halide grains under conditions where the gelatin concentration in the reaction solution is set at from 0.1 to 20 wt %, the addition rates of the silver salt and the halide are set at from 6.times.10.sup.-4 to 2.9.times.10.sup.-1 mol/minute per liter of reaction solution, and the pBr value in the reaction solution is set at from 1.0 to 2.5, Ostwald ripening the nucleated grains, and then growing the thus ripened grains.

REFERENCES:
patent: 4665012 (1987-05-01), Sugimoto et al.
patent: 4701405 (1987-10-01), Takiguchi et al.
patent: 4713318 (1987-12-01), Sugimoto et al.
patent: 4766058 (1988-08-01), Sampei et al.
patent: 4835095 (1989-05-01), Ohashi et al.
Twinning, The Solid State for Engineers, Maurice J. Sinnott, Sc. D., pp. 226-229, John Wiley & Sons, Inc., 1958.

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