Selenium and iridium doped emulsions with improved properties

Details Selenium and iridium doped emulsions with improved properties Selenium and iridium doped emulsions with improved properties

1990-12-27

1992-11-17

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430603, 430605, G03C 109

Patent

active

051642921

ABSTRACT:
The invention is generally accomplished by forming a silver halide emulsion and during precipitation adding iridium and selenium in an amount effective to decrease reciprocity failure with substantially no decrease in speed. In a preferred form, a photographic element is formed comprising of bromoiodide emulsion having about 3 to about 88 nanograms of iridium per square meter of silver halide grain surface area and about 42 to about 487 nanograms of selenium per square meter of silver halide grain surface area. It is also preferred that the iridium and selenium be added at a point after the precipitation has proceeeded to a point wherein at least half of the silver to be added is present.

REFERENCES:
patent: 4035185 (1977-07-01), Evans et al.
patent: 4147542 (1979-04-01), Habu et al.
patent: 4173483 (1979-11-01), Habu et al.
patent: 4439520 (1984-03-01), Kofron et al.
patent: 4444865 (1984-04-01), Silverman et al.
patent: 4693965 (1987-09-01), Ihama et al.
patent: 4828962 (1989-05-01), Grzeskowiak et al.
patent: 4997751 (1991-03-01), Kim
Research Disclosure #308119, Dec. 1989, pp. 993-1015.

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