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1 549 027

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A1

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IPC

(21) (22)

Application

4415926/04, 1988-04-25

(22)

Actual filing date

1988-04-25

(45)

Published

1994-09-30

(72)

Inventor

Shapiro В.I.Slominskij Ju.L.Тolmachev А.I.Smirnova А.L.Vakar А.G.Мikheeva L.I.

IODIDE 2-(9-[3-ETHYL-2-(3H)-BENZOTHIAZOLINIDENE) PROPENYL] BICYCLO (4,4,0) DECADIEN-1,9-YLIDENE-3) METHYL)-3-ETHYLBENZOTHIAZOLIUM AS SPECTRAL SENSITIZER OF BROMOIODOSILVER PHOTOGRAPHIC EMULSIONS HAVING MEAN MONOCRYSTAL DIAMETER OF 0.5 ± 0.1 OR 0,8-1,0 MICRON Russian patent published in 1994 - IPC

Abstract SU 1549027 A1

FIELD: heterocyclic compounds, more particularly iodide 2-(9-[3-(3-ethyl-2-(3H)-benzothiazolinidened) propenyl} bicyclo (4,4,0) decadien-1,9-ylidenemethyl-3-ethylbenzothiazolium which may be used as a spectral sensitizer of bromoiodosilver photographic emulsions having a mean monocrystal diameter of 0.5 ± 0.1 or 0,8-1 micron. SUBSTANCE: the preparation is carried out from a mixture of iodide 2-(9-methylbicyclo (4.4.0) decadien-1.9-ulidene-3) methyl-3-ethylbenzothiazolium, iodide 2-β-acetanylidovenyl)-3-ethylbenzothiazolium in pyridine, triethylamide and absolute alcohol on boiling. The yield 12 %. The use of a new compound for sensitizing bromoiodosilver photographic emulsions having a mean monocrystal diameter of 0.8-1.0 or 0.5 ± 0.1 micron makes it possible to substantially enhance their additional light sensitivity behind a red light filter (Sr.l.0.85

-14), retain the level of optical density (Do) of the fog and the contrast coefficient (γ). EFFECT: improved properties of the title product. 1 tbl

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SU 1 549 027 A1

Authors

Shapiro В.I.

Slominskij Ju.L.

Тolmachev А.I.

Smirnova А.L.

Vakar А.G.

Мikheeva L.I.

Dates

1994-09-30—Published

1988-04-25—Filed

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