Substituted benzodioxin 2- equivalent cyan-forming couplers and photographic elements containing them

摘要

2-Equivalent cyan forming couplers corresponding to the formula: IMAGE wherein Y is hydrogen or a halogen atom, X stands for -CO-, -SO2-, -COCOO-, or -CONH-, and R is an organic ballasting group rendering said couplers non-diffusing in an alkali-permeable layer of a photographic element, can be incorporated in (a) red-sensitized silver halide emulsion layer(s) of a photographic multilayer colour element or in a non-photosensitive colloid layer in water-permeable relationship with the red-sensitized emulsion layer(s). 11 monomeric couplers are exemplified, some of which are stated to be useful in preparing polymeric couplers by emulsion polymerisation.