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1 466 497

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Application

4274933/04, 1987-07-02

(22)

Actual filing date

1987-07-02

(45)

Published

1995-08-09

(72)

Inventor

Nizhner D.G.Belous V.M.Mishakova G.N.Zhukov V.V.Suvorin V.V.Churashov V.P.

METHOD FOR PREPARING OF BROMINE-SILVER PHOTOGRAPHIC EMULSIONS Russian patent published in 1995 - IPC

Abstract SU 1466497 A1

FIELD: production of photographic materials. SUBSTANCE: initially suspension of inorganic salt of alkali-earth metal is prepared. The process is carried out by simultaneously adding sodium sulfate and barium nitrate or barium chloride into aqueous or aqueous-gelatin solution, pSO4 being (1.3-2.5) ± 0.05. Thus prepared suspension is concentrated and washed by aqueous solution of sodium fluoride having pF (1.5-3) + 0.1. Simultaneously adding of silver nitrate and potassium bromide are carried out by controlled double-stream emulsification; pBr and pH have constant values, said values being (2.8-4.5) + 0.05 and (8.6-9.5) + 0.05 respectively. When solid phase is separated single-step dispersion is carried out. Said dispersion takes place in aqueous-gelatin solution which may contain potassium bromide. Then chemical sensibilizing with the help of sodium thiosulfate is carried out. EFFECT: increases maximal optical density. 2 tbl

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SU 1 466 497 A1

Authors

Nizhner D.G.

Belous V.M.

Mishakova G.N.

Zhukov V.V.

Suvorin V.V.

Churashov V.P.

Dates

1995-08-09—Published

1987-07-02—Filed

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