C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
96/36, 260/310.1
C07D 277/04 (2006.01) C07D 521/00 (2006.01) C09B 29/00 (2006.01) G03C 1/40 (2006.01) G03C 8/04 (2006.01) G03C 8/10 (2006.01)
Patent
CA 1221361
Abstract of the Disclosure This invention relates to photographic processes and products for forming an image in dye from a colorless precursor of a preformed image dye which is substituted with a moiety comprising a 1,3-sulfur-nitrogen group, said 1,3-sulfur-nitrogen group (a) being capable of undergoing cleavage in the presence of silver ion and/or soluble silver complex, and (b) possessing an amide substituent on the carbon atom in the 2-position that undergoes an intramolecularly accelerated cleavage reaction following the cleavage of said 1,3-sulfur-nitrogen group, which moiety maintains said precursor in its colorless form at least until the 1,3-sulfur-nitrogen group undergoes said cleavage. In a further embodiment, the cleavage of the amide substituent following the cleavage of the 1,3-sulfur-nitrogen group is used to provide an images distribution of a photographically useful reagent, which reagent may be, for example, a photographically active reagent.
455406
Polaroid Corporation
Smart & Biggar
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