Photographic emulsions containing internally modified silver hal

Details Photographic emulsions containing internally modified silver hal Photographic emulsions containing internally modified silver hal

1988-04-08

1990-07-31

Martin, Roland E.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430569, 430596, 430604, 430605, 430606, 430612, G03C 106

Patent

active

049450352

ABSTRACT:
Photographic silver halide emulsions are disclosed comprised of radiation sensitive silver halide grains containing greater than 50 mole percent chloride and less than 5 mole percent iodide, based on total silver, with any residual halide being bromide, said grains exhibiting a face centered cubic crystal lattice structure formed in the presence of a hexacoordination complex of rhenium, ruthenium, or osmium with at least four cyanide ligands. The emulsions exhibit increased sensitivity.

REFERENCES:
patent: 2448060 (1948-08-01), Trivelli et al.
patent: 3790390 (1974-02-01), Shiba et al.
patent: 3890154 (1975-06-01), Ohkubo
patent: 4126472 (1978-11-01), Sakai et al.
patent: 4147542 (1979-04-01), Habu
patent: 4643965 (1987-02-01), Kubot et al.
patent: 4835093 (1989-05-01), Janusonig et al.
Research Disclosure, vol. 176, Dec. 1978, Item 17643, Section IA.
D. M. Samoilovich, "The Influence of Rhodium and Other Polyvalent Ions on the Photographic Properties of Silver Halide Emulsions", in a paper presented to 1978 International Congress of Photographic Science, Rochester Institute of Technology, Aug. 20-26, 1978.
At the 1982 International Congress of Photographic Science at the University of Cambridge, R. S. Eachus presented a paper titled, "The Mechanism of Ir.sup.3+ Sensitization of Silver Halide Materials".
B. H. Carroll, "Iridium Sensitization: A Literature Review", Photographic Science and Engineering, vol. 24, No. 6, Nov./Dec. 1980, pp. 265-267, is cited for further background on the use of iridium is silver halide emulsions.

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