Process for the preparation of a grain stabilized high chloride

Details Process for the preparation of a grain stabilized high chloride Process for the preparation of a grain stabilized high chloride

1992-01-13

1993-01-05

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430567, 430614, 430615, G03C 107, G03C 1035

Patent

active

051769921

ABSTRACT:
A process is disclosed of preparing an emulsion for photographic use comprising forming in the presence of an xanthinoid grain growth modifier an emulsion comprised of silver halide grains and a gelatino-peptizer dispersing medium in which morphologically unstable tabular grains having {111} major faces account for greater than 50 percent of total grain projected area and contain at least 50 mole percent chloride, based on silver. After the emulsion is formed, the pH of the emulsion is lowered to inactivate xanthinoid grain growth modifier, and the inactivated xanthinoid is replaced on the tabular grain surfaces by adsorption of a photographically useful compound chosen to contain at least one divalent sulfur atom, thereby concurrently morphologically stabilizing the tabular grains and enhancing their photographic utility.

REFERENCES:
patent: 4400463 (1983-08-01), Maskasky
patent: 4713323 (1987-12-01), Maskasky
patent: 4783398 (1988-11-01), Takada et al.
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patent: 4942120 (1990-07-01), King et al.
patent: 4952491 (1990-08-01), Nishikawa et al.
patent: 4983508 (1991-01-01), Ishiguro et al.
patent: 5035992 (1991-07-01), Houle et al.
Research Disclosure, vol. 308, Dec. 1989, Item 308119.

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