2,2'-disulfo-4,4'-substituted triazinylaminophenyl disazostilbenes

A disazo dyestuff according to formula I ##STR119## wherein:

• the two R.sub.1 independently signify hydrogen or a substituent selected from:
• halogen, amino, alkyl, hydroxy, alkoxy, alkylamino, dialkylamino, acylamino, aryl or aryloxy;
• or together with R.sub.2 or R.sub.5 form an optionally substituted carbocyclic or heterocyclic ring;
• the two R.sub.2 independently signify hydrogen or a substituent selected from:
• halogen, acyl, alkyl, cyano, carboxyl, acylamino, alkyl- or phenylsulphonyl, sulphonic acid or alkoxy;
• or together with R.sub.1, signify the atoms required to complete an optionally substituted carbocyclic or heterocyclic ring;
• the two R.sub.3 independently signify a substituent selected from:
• chlorine, fluorine, alkyl- or arylsulphonyl, sulphonic acid or an optionally substituted hydroxyl, mercapto, hydrazino and amino;
• the two R.sub.4 independently signify an amino group bearing one or two substituents, a N-morpholyl, N-piperazyl or N-piperidyl group;
• the two R.sub.5 independently signify hydrogen or an aliphatic or cycloaliphatic radical which may be optionally substituted, or R.sub.5 with R.sub.1 forms an optionally substituted heterocyclic ring,
• and the two M independently signify hydrogen or a monocationic group and, apart from the fact that R.sub.3 may be chlorine or fluorine, no reactive groups are present.