Azo dyes with a diazo component of the 3-amino thiophene series and a coupling component of the pyridine, pyridone or pyrazole series

A thien- 3-ylazo dye of the formula I ##STR64## where X is cyano, C.sub.1 -C.sub.6 -alkanoyl, substituted or unsubstituted benzoyl, substituted or unsubstituted phenyl or the radical COOR.sup.1 or CONR.sup.1 R.sup.2 where R.sup.1 and R.sup.2 are identical or different and each is independently of each other, substituted or unsubstituted C.sub.1 -C.sub.8 -alkyl, C.sub.5 -C.sub.7 -cycloalkyl, C.sub.3 -C.sub.4 -alkenyl, substituted or unsubstituted phenyl or together with the nitrogen atom linking them a member selected from the group consisting of pyrrolidino, piperidino, morpholino, piperazino and N-(C.sub.1 -C.sub.4 -alkyl)piperazino, and R.sup.2 may additionally be hydrogen,

• Y is hydrogen, cyano, C.sub.1 -C.sub.6 -alkanoyl, substituted or unsubstituted benzoyl, substituted or unsubstituted phenyl or the radical COOR.sup.1 or CONR.sup.1 R.sup.2 where R.sup.1 and R.sup.2 are each as defined above,
• Z is hydrogen, substituted or unsubstituted C.sub.1 -C.sub.8 -alkyl, substituted or unsubstituted C.sub.1 -C.sub.6 -alkylthio, substituted or unsubstituted phenyl, substituted or unsubstituted phenylthio or substituted or unsubstituted C.sub.1 -C.sub.6 -alkylsulfonyl or phenylsulfonyl and
• K is a group of the formula (II) ##STR65## where B.sup.1 and B.sup.2 are identical or different and each is independently of the other hydrogen, unsubstituted or substituted C.sub.1 -C.sub.12 -alkyl, substituted or unsubstituted C.sub.3 -C.sub.12 -alkoxyalkoxyalkyl or C.sub.2 -C.sub.12 -alkoxyalkyl, C.sub.5 -C.sub.7 -cycloalkyl, substituted or unsubstituted phenyl, C.sub.3 -C.sub.6 -alkenyl, substituted or unsubstituted benzoyl, C.sub.1 -C.sub.8 -alkanoyl, C.sub.1 -C.sub.6 -alkylsulfonyl or phenylsulfonyl,
• T.sup.1 is hydrogen, C.sub.1 -C.sub.4 -alkyl or phenyl,
• T.sup.2 is hydrogen, cyano, nitro, carbemoyl, C.sub.1 -C.sub.4 -monoalkyl- or dialkyl-carbamoyl, C.sub.1 -C.sub.8 -alkanoyl, C.sub.1 -C.sub.6 -alkanoyl, C.sub.2 -C.sub.6 -alkoxycarbonyl or C.sub.3 -C.sub.6 -alkoxyalkoxyalkoxycarbonyl, and
• the substituents on substituted alkyl, alkylthio, alkoxyalkyl, alkoxyalkoxyalkyl or alkylsulfonyl values of X, Y and Z are selected from the group consisting of hydroxy, C.sub.1 -C.sub.4 -alkoxy, phenoxy, C.sub.1 -C.sub.4 -alkoxycarbonyl, cyano and phenyl, the substituents on substituted benzoyl, phenyl, phenylthio and phenylsulfonyl values of X, Y, Z, B.sup.1 and B.sup.2 are selected from the group consisting of C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy, cyano, fluoro, chloro, bromo and nitro, and the substituents on substituted alkyl, alkoxyalkoxyalkyl and alkoxyalkyl values of B.sup.1 and B.sup.2 are phenyl, cyano, C.sub.1 -C.sub.8 -alkoxycarbonyl, phenoxycarbonyl, halogen, hydroxyl, C.sub.1 -C.sub.8 -alkanoyloxy, benzoyloxy, C.sub.5 -C.sub.7 -cycloalkoxy and phenoxy.