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1 669 300

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A1

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IPC

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Application

4717959/04, 1989-07-11

(22)

Actual filing date

1989-07-11

(45)

Published

1995-01-27

(72)

Inventor

Lifshits Eh.B.Kartasheva O.A.Shagalova D.Ja.Uvarova N.V.Ivanova I.M.Eremina O.Ju.Formina L.V.Ljubich M.S.Pyleva G.N.

METHOD FOR SPECTRAL SENSITIZING OF PHOTOGRAPHIC BROMO-IOD-SILVER EMULSIONS Russian patent published in 1995 - IPC

Abstract SU 1669300 A1

FIELD: production of black-and-white sensitive materials. SUBSTANCE: emulsion with silver iodide content of 5.1-3 mol-percent at pH value of 7 ± 0.5 and pBr value of 2.2-3.2 (in melt) is sequentially doped with cyanine dyes of formulae I (image), II , III (image) or dye of formula I with compound of formula IY , where or 1,1'-diethylxyno- 2,2'-monomethylcyanine, or structure , or with compound of formula Y , or with that of formula YI , or with compounds of formulae II and Y in amount of (65-200)·10-6 M/M of silver halogenide. Each time introduction of sensitizing dye is followed by introduction of spectral sensitization activator of formula YII in amount of 1M/M of sensitizer. EFFECT: improved light sensitivity of photographic emulsion within range of 500-630 nm and reduced residual dyeing of photographic layers upon chemical and photographic treatment. 2 tbl

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SU 1 669 300 A1

Authors

Lifshits Eh.B.

Kartasheva O.A.

Shagalova D.Ja.

Uvarova N.V.

Ivanova I.M.

Eremina O.Ju.

Formina L.V.

Ljubich M.S.

Pyleva G.N.

Dates

1995-01-27—Published

1989-07-11—Filed

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