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2 098 859

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C1

(51)

IPC

(21) (22)

Application

96106673/04, 1996-04-08

(22)

Actual filing date

1996-04-08

(45)

Published

1997-12-10

(72)

Inventor

Shapiro B.I.Mikheeva L.I.Vakar A.G.

(73)

Holder

Zakrytoe Aktsionernoe Obshchestvo

METHOD OF SPECTRAL SENSITIZING OF SILVER-IODIDE PHOTOGRAPHIC EMULSIONS Russian patent published in 1997 - IPC

Abstract RU 2098859 C1

FIELD: photographic industry. SUBSTANCE: invention is intended to be used when manufacturing infrachromatic photographic emulsions. Proposed method is of the "nucleous-shell" type and includes addition of (i) pyrocatechol in quantity (1.5-2.0) x 10-3 mol per 1 mol of silver halide; (ii) phenyl-di(p-anisyl)phosphine; (iii) sensitizing dye thia(selenium)hexacarbocyanine with general formula where A' is hydrogen or lower alkyl; A is -CH2C(CH3)2CH2-; Y is S or Se; R lower alkyl, 2-hydroxyethyl, or 2-carboxyethyl; B hydrogen, chlorine, 6,7-tetramethylene, or benzo group; X = I, Br, Cl, or tozylate in quantity (2-6) x 10-6 mol per 1 mol of silver halide; and (iv) supersensitizer 2,5-di-tert-butylhydroquinone. Method allows manufacturing photographic materials sensitive in 750-1300 nm region with sensitizing maximum at 1170 nm. EFFECT: increased sensibility. 1 tbl

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RU 2 098 859 C1

Authors

Shapiro B.I.

Mikheeva L.I.

Vakar A.G.

Dates

1997-12-10—Published

1996-04-08—Filed

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