C - Chemistry – Metallurgy – 09 – B
Patent
C - Chemistry, Metallurgy
09
B
96/32, 260/174.5
C09B 29/00 (2006.01) G03C 1/10 (2006.01) G03C 8/10 (2006.01)
Patent
CA 1212666
Abstract New dye releasing compounds and their use in photographic silver halide colour materials for the production of colour images by a dye diffusion transfer process. A photographic silver halide material comprises a shifted dye compound capable of releasing a dye moiety, characterized in that said compound corresponds in reduced state to general formula (1) and in oxidized state to general formula (2) : A1 - L - P (1) A2 - L - P (2) wherein : A1 represents a hydroquinonyl group including a substituted hydroquinonyl group, or such group forming part of a fused ring system, A2 represents a quinonyl group including a substituted quinonyl group, or such group forming part of a fused ring system, L represents a bivalent group which undergoes a cleavage under hydrolytic alkaline conditions when the compound is in reduced state corresponding to formula (1), P represents an organic dye moiety incorporating an azo chromophoric group -N=N- linked through a conjugated bond system to an electron-withdrawing group being a monoester oxalyl group Image , wherein R represents an organic group, that can be introduced by esterification of a carboxylic acid group, said monoester oxalyl group being removable by hydrolysis resulting in a residual auxochromic hydroxyl (-OH) group.
442295
Janssens Wilhelmus
Van de Sande Christian C.
Van Den Bergh Armand M.
Afga-Gevaert Naamloze Vennootschap
Borden Ladner Gervais Llp
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