Cationic azo dyes based on aminobenzoic acid

A cationic azo dye of the formula I ##STR39## where n is a number from 0 to 8,

• R.sup.1 is hydrogen, nitro, halogen or C.sub.1 -C.sub.6 -alkyl,
• R.sup.2 and R.sup.3 are independently hydrogen or C.sub.1 -C.sub.6 -alkyl or together with the carbon atom linking them are a cyclopentyl or cyclohexyl radical,
• K is the radical of a coupling component,
• A is oxy, imino or unsubstituted or substituted C.sub.1 -C.sub.6 -alkylimino,
• B is C.sub.1 -C.sub.6 -alkylene which may be interrupted by 1 or 2 nonadjacent oxy, imino or unsubstituted or substituted C.sub.1 -C.sub.6 -alkylimino groups and a radical ##STR40## Q.sup.1, Q.sup.2 and Q.sup.3 independently are hydrogen, C.sub.1 -C.sub.10 -alkyl which may be interrupted by from 1 to 4 nonadjacent oxy, imino and unsubstituted or substituted C.sub.1 -C.sub.4 -alkylimino groups and may be substituted by hydroxyl, halogen or phenyl, and Q.sup.1 and Q.sup.2 together with the nitrogen atom linking them are a 5- or 6-membered heterocyclic radical with or without nitrogen or oxygen as a further heteroatom, and
• An.sup..crclbar. is the equivalent of an anion.