BigPatents India

Compounds of formula wherein R1 is hydrogen, hydroxy, halogen, nitro, cyano, amino, carboxy, carboxylic ester, sulfo, sulfo- nic ester, carboxylic amide, sulfonic amide, alkoxy, aryloxy, alkylthio or arylthio, X is -0-, -8-, -NH- or -N(alkyl)-, Y is hydrogen or carboxylic ester, Z is =C- or =N-, T is =C- or =N-, R2 is hydrogen, alkyl or CN, n is 0 or 1, when Z is =N- then n is 0, m is 0 or 1, when T is =N- then m is 0, A is a heterocyclic or linear or polycondensed aromatic group which is unsubstituted or substituted by hydroxy alkyl, halogen, nitro, cyano, amino, acylamino, carboxylic ester, sulfonic ester, carboxylic amide, sulfonic amide, alkoxy, aryloxy, alkylthio, arylthio or phenyl, or A together with T and R2 can form an allycyclic or heterocyclic ring, their preparation and their use in the production of coloured plastics or polymeric colour par- ticles.