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(11) | EP 0 321 401 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Polymeric colour couplers |
| (57) A polymeric colour coupler which comprises the residue of three monomeric colour
couplers of the formulae
where R₁ is hydrogen, alkyl, chlorine or bromine, R₂ is a divalent organic radical and W₁, W₂ and W₃ are each an active colour former moiety capable of forming upon chromogenic development of exposed silver halide material with a primary aromatic amine colour developing agent a dye, W₁ forming a yellow dye, W₂ forming a magenta dye and W₃ forming a cyan dye. |