- Piperazinyl-triazinylnaphtholsulphonic acid azo dyes
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Water-soluble triazine compounds which, in their betaine form correspond to the formula STR1 wherein R1 denotes hydrogen or alkyl, R2 and R3 independently of one another denote hydrogen, alkyl, alkenyl or aralkyl, X denotes halogen, hydroxyl, alkoxy, alkyl, aryl or an optionally monosubstituted or disubstituted amino group, the substituents of which can be involved--optionally via a hetero-atom--in cyclization, and Y denotes hydrogen or the radical of an azo dyestuff, and wherein the cyclic and acyclic radicals can carry further substituents, are used--when Y represents the radical of an azo dyestuff--for dyeing synthetic and natural materials, in particular paper, and--when Y represents hydrogen--for the preparation of azo dyestuffs.
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