Isothiazolylazo dyes having aminophenyl and aminonaphthyl components

An isothiazolylazo dye of the formula:

• ##STR110## wherein R is alkyl or unsubstituted aryl radical or a substituted aryl radical of the formula:
• ##STR111## and K is a radical of the formula:
• ##STR112## wherein B is C.sub.1 -C.sub.4 alkyl or a substituted amino radical selected from the group consisting of:
• ##STR113## where R.sup.1 is hydrogen, methyl, methoxy or ethoxy, R.sup.2 and R.sup.3 independently of one another are each unsubstituted C.sub.1 -C.sub.4 alkyl or substituted alkyl groups selected from the group consisting of C.sub.1 -C.sub.4 alkyls which are substituted by chlorine, bromine, cyano, hydroxyl, C.sub.1 -C.sub.4 alkoxy, benzyloxy, phenoxy, phenyl, C.sub.1 -C.sub.4 -alkylcarbonyloxy which is unsubstituted or further substituted by C.sub.1 -C.sub.4 alkoxy, phenoxy or phenyl, or phenylcarbonyloxy which is unsubstituted or substituted by chlorine, bromine, methoxy, ethoxy, methyl or ethyl, oxycarbonyl, C.sub.1 -C.sub.4 alkoxycarbonyl, C.sub.1 -C.sub.4 alkoxycarbonyloxy, carbamyl, phenylalkoxycarbonyloxy, phenoxyalkyloxycarbonyloxy, C.sub.1 -C.sub.4 alkoxyalkoxycarbonyloxy, phenylaminocarbonyloxy which is unsubstituted or substituted by chlorine, methoxy or methyl, C.sub.1 -C.sub.4 alkoxyalkoxycarbonyl, phenylalkyloxycarbonyl or C.sub.1 -C.sub.4 alkylaminocarbonyloxy which is unsubstituted or substituted by C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, chlorine or bromine;
• or R.sup.3 is hydrogen, R.sup.4 is a radical of the formula --A--OCO--Y-- R, Z is hydrogen or methyl, X is hydrogen, methyl or methoxy or an acylamino radical selected from the group consisting of:
• --NHCHO, --NHCOCH.sub.3, --NHCOC.sub.2 H.sub.5, --NHCO-aryl,
• --NHCOCH.sub.2 -aryl or ##STR114## or --COCH.sub.2 --O--CH.sub.3, A is C.sub.2 - or C.sub.3 -alkylene and Y is --O-- or --NH--.