Processes for the preparation of silver halide emulsions of cont

Details Processes for the preparation of silver halide emulsions of cont Processes for the preparation of silver halide emulsions of cont

1984-05-18

1985-11-12

Downey, Mary F.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430567, 430568, 430596, G03C 102, G03C 100

Patent

active

045528381

ABSTRACT:
A process is disclosed of producing photographically useful radiation sensitive silver halide emulsions the grains of which are of a predetermined size distribution, including selection of maximum and minimum grain diameters and selection of the distribution of grains of maximum, minimum, and intervening diameters. This is achieved by modifying a double jet precipitation to introduce during the run stable silver halide grains capable of acting as host grains for the deposition of additional silver and halide ions. The degree to which the host grains initially introduced are grown determines the maximum grain diameter of the emulsion. The minimum diameter of the grains in the emulsion produced can be determined by the diameter of the stable silver halide grains introduced at the end of the run. The rate at which the stable host grains are introduced during the run controls the distribution of intervening grain sizes.
The silver halide emulsion produced in various forms can be comprised of silver halide grains differing in diameter such that (a) the relative frequency of grain size occurrences is relatively invariant over much of the range of grain sizes present; (b) the maximum relative frequency of grain sizes occurs near the minimum grain diameter of the emulsion; (c) the maximum relative frequency of grain sizes occurs near the maximum grain diameter; or (d) maximum relative frequencies of grain sizes occur near both the maximum and minimum grain sizes.

REFERENCES:
patent: 3367778 (1968-02-01), Berriman et al.
patent: 3415650 (1968-12-01), Frame et al.
patent: 3482982 (1969-12-01), Miyata et al.
patent: 3650757 (1972-03-01), Irie et al.
patent: 3761276 (1973-09-01), Evans
patent: 3790386 (1974-02-01), Posse et al.
patent: 3897935 (1975-08-01), Forster et al.
patent: 4046576 (1977-09-01), Terwilliger et al.
patent: 4184878 (1980-01-01), Maternaghan
patent: 4242445 (1980-12-01), Saito
patent: 4269927 (1981-05-01), Atwell
patent: 4334012 (1982-06-01), Mignot
patent: 4336328 (1982-06-01), Brown et al.
patent: 4349622 (1982-09-01), Koitabashi et al.
patent: 4446228 (1984-05-01), Honda et al.
patent: 4481288 (1984-11-01), Yamada et al.

Affiliated with

Also associated with

Rating

Processes for the preparation of silver halide emulsions of cont does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Processes for the preparation of silver halide emulsions of cont, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Processes for the preparation of silver halide emulsions of cont will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1880066