PROCESS FOR THE CONTINUOUS DYEING OF SYNTHETIC FIBRE MATERIALS

Process for the continuous dyeing of synthetic fibre materials from organic solvents, characterised by impregnating the fibre materials with dye liquors which contain nitro dyestuffs of the formula IN WHICH R1 - R6 represent, independently of one another, a hydrogen, fluorine, chlorine or bromine atom, a hydroxyl, alkoxy, alkoxy-carbonyloxy, alkylcarbonyloxy, arylcarbonyloxy, aroxycarbonyloxy, nitro, cyano, phenoxy, acylamino, aminocarbonyl, aminosulphonyl, acyl, alkoxycarbonyl, aroxycarbonyl or a trifluoromethyl group, X is a -SO2- or -CO- group, Y is -O- or -NH-, and Z is a single C-C bond or -O-, m and n are a number from 0 - 3, and B1 and B2 stand for a C1 - C9 alkyl, cycloalkyl or aralkyl radical, with the proviso that the sum total of the carbon atoms altogether contained in the substituent or substituents B amounts to at least 3 and at most 10, and that the sum total of n and m is at least 1, and subjecting the materials to a heat treatment.