Verfahren zur Herstellung neuer Azofarbstoffe

The invention comprises water-soluble azo dyes of formula wherein R is a naphthalene residue containing three sulphonic acid groups, R1 is a benzene or naphthalene residue linked in the 1:4-positions, X is a halogenated 1,3,5-triazine residue with or without dyestuff character which is bound to the -NH- bridge through a carbon atom of the triazine ring. The triazine residue is preferably of formula wherein Y is a chlorine atom or an unsubstituted or substituted amino group or an etherified hydroxyl or thio group. The dyes are prepared by condensing a corresponding amino-disazo dye, which is prepared by the usual diazotization and coupling methods, with an equimolar amount of a di- or tri-halotriazine. If a tri-halotriazine is used the primary condensation product may be further condensed with ammonia or an amine or a hydroxyl or thio compound. The dyes may be used to colour wool, polyamide and polyurethane fibres but are preferably used to colour cellulose fibres in the presence of alkali in red to brown shades. In examples: (1) the disazo dye 1-aminonaphthalene - 2,5,7 - trisulphonic acid --> 1 - amino - 2,5 - dimethylbenzene --> 1 - aminonaphthalene-6-sulphonic acid is condensed with cyanuric acid is condensed with cyanuric chloride; (2) the dye specified in (1) is further condensed with 1 - amino - 4 - (41 - amino - phenylamino) - anthraquinone - 2,31 - disulphonic acid, 1 - amino - 7 - phenylazo - 8 - naphthol - 21,3,6 - trisulphonic acid, ammonia, piperidine or morpholine. Further examples are specified. Specifications 797,946, 838,337 and 847,635 also are referred to.