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

Claim 1

A process for dyeing a hydroxy group-containing fiber material in an aqueous bath, wherein a water-soluble azo compound is applied to the material in an aqueous solution and allowed to act on the material from the aqueous solution at a pH value between 4 and 8 and at a temperature between 100° and 150° C. to be fixed on the material, said water-soluble azo compound having the formula ##STR40## in which A is phenylene unsubstituted or substituted by 1 or 2 substituents selected from the group consisting of alkoxy of 1 to 4 carbon atoms, alkyl of 1 to 4 carbon atoms, chlorine, sulfo and carboxy, or A is a group of the formula ##STR41## in which W is a direct bond or a vinylidene group of the formula --CH═CH-- or a group of the formula --NH--CO--NH-- and R* is hydrogen or nitro, sulfo, carboxy, methyl, ethyl, methoxy or ethoxy; B is a pyridinium group of the formula ##STR42## in which R is carboxy or carbamoyl; n is zero or 1; M is hydrogen or an alkali metal; K is a group of the formula ##STR43## the one --SO 3 M group being bonded in the meta- or para-position relative to the --NH--Z group or is ##STR44## in which D is phenylene unsubstituted or substituted by 1 or 2 substituents selected from the group consisting of chlorine, bromine, alkyl of 1 to 4 carbon atoms, alkoxy of 1 to 4 carbon atoms, carboxy and sulfo, or is naphthylene unsubstituted or substituted by 1 or 2 sulfos; R 1 is hydrogen, chlorine, alkyl group of 1 to 4 carbon atoms or alkoxy of 1 to 4 carbon atoms; R 2 is hydrogen or alkyl of 1 to 4 carbon atoms; G is carboxy, methyl or carbalkoxy of 2 to 5 carbon atoms; Y is a vinyl, β-sulfatoethyl or β-chloroethyl; M has the abovementioned meaning; m is zero or 1; Z is α- or β-bromoacryloyl or is β-chloropropionyl, β-chloroethylsulfonylbenzoyl or (β-chloroethylsulfonylmethyl)-benzoyl or a group of the formula ##STR45## in which D and Y have the abovementioned meanings and Hal is chlorine or fluorine; one of the sulfo, sulfato and carboxy groups forming an anion equivalent to the pyridinium cation.