Process for the preparation of a hybrid direct positive emulsion

Details Process for the preparation of a hybrid direct positive emulsion Process for the preparation of a hybrid direct positive emulsion

1994-09-30

1996-03-12

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430567, G03C 1015, G03C 1005, G03C 1035

Patent

active

054985170

ABSTRACT:
A process is disclosed for the preparation of a hybrid direct positive silver halide emulsion comprising the steps of (1) forming an essentially cubic host grain emulsion consisting of silver bromide or silver iodobromide, with a iodide content between 0 and 10 mole %, by a balanced double jet, (2) depositing epitaxially on the corners of said formed essentially cubic host grains a silver iodide crystallographic phase wherein said silver iodide phase contains at most 5 % of the total crystal silver halide, either by precipitating a silver chloride epitaxial phase and converting it to silver iodide, or by adding silver ions and an organic iodide releaser.
The organic iodide releaser is preferably mono-iodoacetic acid.

REFERENCES:
patent: 4063951 (1977-12-01), Bogg
patent: 4142900 (1979-03-01), Maskasky
patent: 5418124 (1995-05-01), Suga et al.
patent: 5426023 (1995-06-01), Uchida
"Science and Technology of Photgraphy", K. Keller, ed.; VCH, 1994, Weinheim FRG, p. 53.

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