Monoazo dyes containing a 4-substituted-2-azo-1,1'-diphenylsulfone component

A monoazo dye of the formula ##STR227## in which K is an aminobenzene, alkoxybenzene, aminonaphthalene, alkoxynaphthalene, naphthol, aminonaphthol, pyrazolone, aminopyrazole, pyridone pyrimidine, indole, naphthimidazole, diphenylamine, pyrazolo[2,3-a]pyrimidine, tetrahydroquinoline or acetoacetamide radical, and R is ##STR228## --CO--R.sub.2 or --SO.sub.2 --O--R.sub.2 in which R.sub.1 is hydrogen or C.sub.1-4 -alkyl and R.sub.2 is monosulfo-C.sub.1-12 -alkyl which is unsubstituted or substituted by halogen, hydroxyl, cyano, C.sub.1-4 -alkoxy, C.sub.1-6 -alkanoyl or benzoyl, or a radical of the formulae ##STR229## where R.sub.3 in the formulae (2) and (3) is hydrogen, C.sub.1-4 -alkyl, C.sub.1-4 -alkoxy, halogen, C.sub.2-6 -alkanoylamino or carboxyl, and X and Y, independently of each other, are hydrogen, C.sub.1-4 -alkyl, C.sub.1-4 -alkoxy, halogen, C.sub.2-6 -alkanoylamino, C.sub.1-5 -alkylsulfonylamino, phenyl which is unsubstituted or substituted by C.sub.1-4 -alkyl, C.sub.1-4 -alkoxy, halogen, C.sub.1-6 -alkanoyl amino, hydroxyl or carboxyl, or phenoxy which is unsubstituted or substituted by C.sub.1-4 -alkyl, C.sub.1-4 -alkoxy, halogen, C.sub.1-6 -alkanoylamino, hydroxyl or carboxyl.