Nonionic alkynyl compounds and applications thereof to...

Details Nonionic alkynyl compounds and applications thereof to... Nonionic alkynyl compounds and applications thereof to...

C - Chemistry, Metallurgy

07

D

96/100, 260/296,

C07D 235/14 (2006.01) C07D 277/64 (2006.01) G03C 1/06 (2006.01)

Patent

CA 1204758

-0- NONIONIC ALKYNYL COMPOUNDS AND APPLICATIONS THEREOF TO SILVER HALIDE PHOTOGRAPHY ABSTRACT OF THE DISCLOSURE A photographically useful alkynyl compound is disclosed which is nonionic under aqueous alkaline photographic processing conditions. The alkynyl compound is comprised of an alkynyl group attached to a methylene group through a divalent chalcogen atom. The methylene group is activated by an electron withdrawing substituent. The alkynyl compounds are useful in direct positive internal latent image forming emulsions as nucleating agents and in negative working surface latent image emulsions to increase speed and/or contrast.

436092

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