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1 302 895

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Application

3920521/04, 1985-07-17

(22)

Actual filing date

1985-07-17

(45)

Published

1997-03-20

(72)

Inventor

Breslav Ju.A.Pejsakhov V.V.Andrejanov V.V.Myl'Tseva V.A.Khejnman A.S.Shvartser O.N.Donatova V.P.Sukhotin L.M.Kotov A.G.

METHOD OF PREPARING SILVER BROMIDE/SILVER IODIDE PHOTOGRAPHIC EMULSION Russian patent published in 1997 - IPC

Abstract SU 1302895 A1

FIELD: light-sensitive emulsions. SUBSTANCE: invention relates to a method of preparing emulsion containing flat silver halide monocrystals. In order to increase light sensitivity (to 100-250 relative units) and covering power (to 0.92-1.20) of emulsion, two-jet crystallization process is performed by way of simultaneous introduction into aqueous gelatin solution of equimolar silver nitrite and alkali metal bromide solutions with equal and constant rates at 40-70 C followed by entering into emulsion obtained equimolar solutions of silver nitrate and alkali metal bromide or alkali metal bromide/iodide mixture with volume rates rising from 1 to 40 ml/min as crystallization is progressing. In this case, crystallization is carried out at pBr 0.9-1.1 and pH 6.0-10.0 by introducing alkali metal or ammonium hydroxide, cooling emulsion, adding phthaloylgelatin, and lowering pH to 2.5-3.5. EFFECT: increased light sensitivity and covering power of emulsion. 1 tbl

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SU 1 302 895 A1

Authors

Breslav Ju.A.

Pejsakhov V.V.

Andrejanov V.V.

Myl'Tseva V.A.

Khejnman A.S.

Shvartser O.N.

Donatova V.P.

Sukhotin L.M.

Kotov A.G.

Dates

1997-03-20—Published

1985-07-17—Filed

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