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2 092 884

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C1

(51)

IPC

(21) (22)

Application

3156859/04, 1986-12-04

(22)

Actual filing date

1986-12-04

(45)

Published

1997-10-10

(72)

Inventor

Trubnikova A.A.Perovskaja N.V.Krestovnikova T.I.Lomov V.I.Dudareva N.V.

(73)

Holder

Zakrytoe Aktsionernoe Obshchestvo

METHOD OF MANUFACTURING AMMONIACAL SILVER BROMIDE/IODIDE EMULSIONS Russian patent published in 1997 - IPC

Abstract RU 2092884 C1

FIELD: photographic industry. SUBSTANCE: emulsion with microcrystal size 0.25 to 1 mcm and silver iodide content 3-4 mol % is manufactured by way of fractional emulsifying, physical crystallization, isolation of solid phase with sulfopolystyrene, washing precipitate, dispersing precipitate by distilled water, redispersing precipitate in water- gelatin solution, adjusting pBr to 2.9 ± 0.1 and pH to 6.7 + 0.1, chemical crystallization with sodium thiosulfate and gold thiocyanate, and getting emulsion ready to pouring. According to invention, in redispersing or chemical crystallization stage, ethyl acrylate- metacrylic acid copolymer is added in quantity 50-150 g per 1 kg of emulsion. EFFECT: improved composition of emulsion. 1 tbl

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RU 2 092 884 C1

Authors

Trubnikova A.A.

Perovskaja N.V.

Krestovnikova T.I.

Lomov V.I.

Dudareva N.V.

Dates

1997-10-10—Published

1986-12-04—Filed

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