SILVER HALIDE PHOTOGRAPHIC EMULSION Russian patent published in 1999 - IPC

Abstract RU 2127893 C1

FIELD: light-sensitive materials. SUBSTANCE: invention relates to silver halide photographic emulsions with nucleus-shell-type microcrystals and can be used in manufacturing various-type black-and-white and color photographic materials. Emulsion contains silver chlorobromide microcrystals with silver chloride concentration from 5 to 93.5 mol % based on total amount of halides in nucleus-shell structure, wherein nuclei and shells of microcrystals contain, respectively, 3 to 90 and 85-100 mol % of silver bromide, difference of silver bromide concentrations in shell and nucleus being 10 to 90 mol %. Proposed distribution of silver halides in microcrystals' bulk makes it possible to enlarge assortment of chloride-containing silver halide nucleus-shell-type emulsions and their application area thanks to improved totality of sensitometric characteristics, in particular: increased level of sensitivity to the level of silver bromoiodide emulsion with equal- size microcrystals, reduced fog density by a factor of 1.5 to 2.4, increased contrast factor by 30 to 60%, increased maximum optical densities by 10-20%, and increased stability of sensitometric characteristics on storage. EFFECT: enlarged assortment and application area. 3 cl, 2 tbl, 42 ex

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RU 2 127 893 C1

Authors

Pospelova N.V.

Kirilenko G.V.

Ponomarenko Z.G.

Gavrikova O.A.

Dates

1999-03-20Published

1997-07-15Filed