Photographic silver bromoiodide emulsions, elements and processe

Details Photographic silver bromoiodide emulsions, elements and processe Photographic silver bromoiodide emulsions, elements and processe

1988-08-05

1990-11-27

Michl, Paul R.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430567, 430543, G03C 102

Patent

active

049735489

ABSTRACT:
A photographic silver bromoiodide emulsion comprises a dispersing medium and a silver bromoiodide that (a) is monodispersed, cubic grain silver bromoiodide; (b) has a grain size within the range of 0.1 to 0.7 micron; (c) contains 1 to 7 mole percent iodide; and, (d) is prepared by a process comprising (i) forming the silver bromoiodide grains by mixing, in the presence of a thioether ripening agent, silver salt and alkali metal bromide and iodide salts until 60 to 90% of the silver salts have been added; then, (ii) carrying out the remainder of the silver bromoiodide grain formation with the addition of silver salt and alkali metal bromide and iodide salts that are no more than 1 mole percent iodide; wherein the resulting silver bromoiodide grains have no discernible shell as analyzed by x-ray diffraction. Such photographic silver bromoiodide emulsions are useful in photographic silver halide materials to provide longer exposure latitude.

REFERENCES:
patent: 3271157 (1966-06-01), McBride
patent: 3505068 (1970-04-01), Beckett et al.
patent: 3574628 (1971-04-01), Jones
patent: 3737313 (1973-06-01), Rosecrants et al.
patent: 4046576 (1977-09-01), Terwilliger et al.
patent: 4248962 (1981-02-01), Lau
patent: 4284717 (1981-08-01), Toya et al.
patent: 4433048 (1984-02-01), Solberg et al.
patent: 4704351 (1987-11-01), Takiguchi et al.
patent: 4720452 (1988-01-01), Takiguchi et al.
Research Disclosure, Dec. 1978, Item 17643.
The Journal of Photographic Science, 1978, vol. 26, pp. 189-193.

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