Azo dyes

A compound of formula ##STR23## wherein K is the radical of a benzene, naphthalene, 1-phenypyrazol-5-one, 1-phenyl-5-aminopyrazole, pyridone, pyrimidine, indole, naphthylimidazole, diphenylamine, pyrazolo›2,3-a!pyrimidine, tetrahydroquinoline or aceto acetic acid amide coupling component, which radicals are unsubstituted or substituted by C.sub.1 -C.sub.6 alkyl;

• C.sub.1 -C.sub.4 alkoxy;
• phenoxy;
• unsubstituted or hydroxy-substituted C.sub.2 -C.sub.6 alkanoylamino;
• benzoylamino;
• amino;
• N-C.sub.1 -C.sub.4 alkylamino or N,N-di-C.sub.1 -C.sub.4 alkyamino, each of which is unsubstituted or substituted in the alkyl moiety by hydroxy, C.sub.1 -C.sub.4 alkoxy, carboxy, cyano, halogen, sulfo, sulfato, phenyl or sulfophenyl;
• cyclohexylamino;
• N-phenylamino or N-C.sub.1 -C.sub.4 alkyI-N-phenylamino, each of which is unsubstituted or substituted in the phenyl moiety by C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, halogen or sulfo;
• C.sub.2 -C.sub.4 alkoxycarbonyl;
• trifluromethyl;
• nitro;
• cyano;
• halogen, ureido;
• hydroxy;
• carboxy;
• carboxy;
• sulfo;
• sulfomethyl;
• carbamoyl;
• sulfamoyl;
• N-phenylsulfamoyl or N-C.sub.1 -C.sub.4 alkyI-N-phenylsulfamoyl;
• each of which is unsubstituted or substituted in the phenyl moiety by sulfo or carboxy;
• methylsulfonyl or ethylsulfonyl;
• or phenylazo or naphthylazo, each of which is unsubstituted or substituted by C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, halogen, sulfo, amino, N-C.sub.1 -C.sub.4 alkylamino, N,N-di-C.sub.1 -C.sub.4 alkylamino, or phenylamino;
• X is a bridge member of formula --SO.sub.2 --O--, R.sub.1 and R.sub.2 are each independently of the other hydrogen, C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, halogen or sulfo, (R.sub.3).sub.0-3 is 0-3 identical or different radicals R.sub.3 selected from the group consisting of C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, halogen and sulfo, R.sub.4 is hydrogen, carboxyl or trihalomethyl, R.sub.5 is hydrogen or C.sub.1 -C.sub.4 alkyl, R.sub.6 is unsubstituted or substituted C.sub.1 -C.sub.4 alkyl, C.sub.2 -C.sub.4 alkenyl or phenyl, or the --N(R.sub.5)--CO--R.sub.6 radical is a radical of formula ##STR24## R.sub.7 is a --CHY--CH.sub.2 Y or --CY.dbd.CH.sub.2 radical, wherein Y is bromo or chloro, m is 0 or 1, and n is 0, 1, 2 or 3, with the proviso that the sum of (n+m) .gtoreq.1.