Reactive water-soluble azo dyes containing carboxy- or carbamoyl-pydridinium groups for dyeing textiles

摘要

Water-soluble azo compounds having useful fiber-reactive dye properties conforming to the general formula in which: A is phenylene which may be substituted or unsubstituted, or is a radical of the formula in which W is a direct bond or a radical of the formula -CH=CH- or -NH-CO-NH- and R* denotes hydrogen, nitro, sulfo, carboxy, methyl, ethyl, methoxy or ethoxy; n is the number zero or 1; B is a radical of the formula where R is equal to carboxy or carbamoyl; M is hydrogen or an alkali metal; and K is one of five radicals described in the specification, each of which contains a fiber-reactive group. These azo compounds produce fast dyeings on carboxamido- and/or hydroxy-containing materials, in particular cellulose fibers. On cellulose, fast dyeings are also obtained in a weakly acid to neutral medium, for example together with disperse dyes for dyeing a polyester fiber portion.