Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Silver compound sensitizer containing
Patent
1992-08-27
1995-02-28
Bowers, Jr., Charles L.
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Silver compound sensitizer containing
430567, G03C 1015, G03C 1035, G03C 107
Patent
active
053936531
ABSTRACT:
A method for preparing a silver halide emulsion. The method comprises supplying bromine and/or bromine ion at a plurality of processing stages to silver halide host grains to form a phase rich in silver bromide in the vicinity of the apexes of the grains. The host grains are substantially of a cube or octahedron and have a silver chloride content of about 95 mole % or more, and a silver bromide content of about 0 to about 5 mole %. The bromine and/or bromine ion is supplied at the plurality of stages by adding and mixing in a reaction vessel at least one of (i) a water soluble bromine compound, (ii) silver halide grains having a smaller average grain size and a larger silver bromide content than the silver halide host grains, and (iii) a bromine or bromine ion precursor represented by a certain formula (S). In at least one stage of the plurality of processing stages the bromine and/or bromine ion is supplied when the formation of the silver bromide-rich phase is at least 80% complete in the previous stage.
REFERENCES:
patent: 4820624 (1989-04-01), Hasebe et al.
patent: 4865962 (1989-09-01), Hasebe et al.
patent: 5061615 (1991-10-01), Kase et al.
patent: 5200310 (1993-04-01), Ohshima
Bowers Jr. Charles L.
Fuji Photo Film Co. , Ltd.
Huff Mark F.
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