Coloration process

Abstract

A process for the coloration of aromatic polyester textile materials which comprises applying to the said textile materials by an aqueous dyeing, padding or printing process a disperse monoazo dyestuff, free from carboxylic acid and sulphonic acid groups, which, in one of the possible tautomeric forms, is represented by the formula: ##STR1## wherein A is phenyl or phenyl which contains at least one substituent selected from chlorine, bromine, nitro, cyano, trifluoromethyl, thiocyano, lower alkyl, lower alkoxy, lower alkylcarbonyl, lower alkylsulphonyl, lower alkylcarbonylamino, carbamoyl and N-lower alkyl and N:N-di lower alkyl derivatives thereof, sulphamoyl and N-lower alkyl and N:N-di lower alkyl derivatives thereof, sulphamato and N-lower alkyl and N:N-di lower alkyl derivatives thereof, lower alkoxycarbonyl, lower alkoxy lower alkoxycarbonyl, lower alkoxy lower alkoxy lower alkoxycarbonyl, hydroxy lower alkoxycarbonyl, hydroxy lower alkoxy lower alkoxycarbonyl, and lower alkoxycarbonyl lower alkyl. X is hydrogen, lower alkyl, carbamoyl, cyano, chlorine, bromine, nitroso, nitro, lower alkylcarbonyl, sulphamoyl, lower alkylsulphonyl, lower alkylcarbonylamino or lower alkoxycarbonyl; and Z is hydrogen or lower alkyl; And subsequently giving the colored textile material a treatment in an aqueous alkaline bath at a pH above 8 and at a temperature between 50.degree. and 85.degree. C, whereby the textile materials are colored in greenish-yellow to red shades possessing excellent fastness properties.