Magenta coupler monomer, polymeric magenta coupler and recording material for colour photography containing this polymeric magenta coupler

摘要

Magenta images of increased colour density Dmax are obtained with polymeric magenta couplers which contain polymerised units of a polymerisable pyrazoloazole coupler, containing carboxyl groups, of the formula I …IMAGE… in which… R1 is H, alkyl, aralkyl or aryl,… X is H or a group releasable by coupling,… Za, Zb and Zc are an optionally substituted methine group, =N- or -NH-, either the bond Za-Zb or the bond Zb-Zc being a double bond and the other bonds in each case being a single bond, and in which at least R1 or X or a substituent on a methine group, represented by Za, Zb or Zc, is an ethylenically unsaturated polymerisable group in an optionally polymerised form and at least R1 or X or a substituent on a methine group, represented by Za, Zb or Zc, contains a carboxyl group.