Internal latent image-type direct positive silver halide emulsio

Radiation imagery chemistry: process – composition – or product th – Post imaging processing – Positive

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430410, 430598, 430940, 430592, G03C 524

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active

045827796

ABSTRACT:
A previously unfogged internal latent image-type direct positive silver halide emulsion and a photographic material incorporating such emulsion are described, wherein the emulsion contains at least one sensitizing dye represented by formula (I): ##STR1## wherein one of R.sup.1 and R.sup.2 represents a sulfoalkyl group and the other thereof represents an unsubstituted or substituted alkyl group, an unsubstituted or substituted aryl group, or a pyridyl group; X represents a sulfur atom or an oxygen atom; Y represents a sulfur atom, an oxygen atom, or ##STR2## wherein R represents a lower alkyl group or --CH.sub.2).sub.n.sbsb.1 O--CH.sub.2).sub.n.sbsb.2 OH, wherein n.sub.1 and n.sub.2 each represents an integer of 1 to 4; and W represents a hydrogen atom, a halogen atom, a lower alkyl group, a lower alkoxy group, or an unsubstituted or substituted phenyl group.

REFERENCES:
patent: 3736145 (1973-05-01), Hirata et al.
patent: 3772030 (1973-11-01), Gilmar et al.
patent: 3865596 (1975-02-01), Furuya et al.
patent: 4263397 (1981-04-01), Horikoshi et al.
patent: 4266003 (1981-05-01), Ikeda et al.

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