AZO DYES, THEIR PREPARATION AND USE

摘要

Monoazo dyes of the formula (1) in which K is a radical of the formula (2) or of the formula (3) in which R1 and R2 independently of one another is (sic) hydrogen, C1-4-alkyl, which can be substituted by halogen, cyano, hydroxyl, carboxyl, sulfo, sulfato, C1-4-alkoxy, C1-4-alkoxycarbonyl, C1-4-alkanoyloxy, phenyl, sulfophenyl and naphthyl, or cyclohexyl, or C1-4-alkenyl, which can be substituted by halogen, or phenyl or naphthyl, or in which R1 and R2, together with the nitrogen atom connecting them and where relevant with the inclusion of a further hetero-atom, form a heterocyclic 5-membered or 6-membered ring, R3 is hydrogen, C1-4-alkyl, C1-4-alkoxy, which can be substituted by hydroxyl and C1-4-alkoxy, or C1-4-alkanoylamino, or benzoylamino, which can be substituted in the benzene nucleus by methyl, ethyl, methoxy, ethoxy, chlorine, carboxyl and sulfo, or ureido, C1-4-alkylsulfonylamino, or phenylsulfonylamino, which can be substituted in the benzene nucleus by methyl, ethyl, methoxy, ethoxy, chlorine, carboxyl and sulfo, or naphthylsulfonylamino, R4 is methyl or phenyl and R5 is hydrogen or C1-8-alkyl, and in which, if K is the radical of the formula (2), R3 may not be hydrogen if R1 or R2 is benzyl, produce, on polyamide material, dyeings with good light fastness and wet fastness.