Process of sensitizing silver halide emulsions with heterocyclic

Details Process of sensitizing silver halide emulsions with heterocyclic Process of sensitizing silver halide emulsions with heterocyclic

1974-10-10

1977-01-04

Louie, Jr., Won H.

Gas separation: apparatus

Chromatography type apparatus

Having imbedded baffle or flow distributor

G03C 128

Patent

active

040010252

ABSTRACT:
Silver halide crystals in photographic emulsions are sensitized by the addition of compounds to the emulsion which will form silver sulphide with the silver halide crystals at a fast reaction rate v, where v = k. [concentration of the sensitizer compound in the emulsion] and k, the rate constant for the sulphide formation under the digestion conditions is in the range of from 0.1 to 100 min.sup.-.sup.1, and preferably at 0.5 to 10 min.sup.-.sup.1, provided that the sensitizer compound will distribute itself over the silver halide crystal surfaces at a rate which is fast as compared with the reaction rate of the sensitizer compound with the silver halide crystals so that substantially every silver halide crystal has an amount of sensitizer compound adsorbed to its surface from the beginning of the reaction sufficient to give the emulsion good contrast but not sufficient to cause fog.

REFERENCES:
patent: 2410689 (1946-11-01), Sheppard et al.
patent: 3320069 (1967-05-01), Illingsworth
patent: 3502471 (1970-03-01), Van Pee et al.
Ulbing, Serial No. 51,021 June 29, 1970, Published in 883 OG 12 on Feb. 2, 1971, No. T883,017.
Journal of Photographic Science, vol. 20, 1972, pp. 107-110.
Journal of Photographic Science, vol. 20, 1972, pp. 223-227.

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