Soluble trisazo dyestuffs containing a 2-phenyl-benzimidazolyl, -benzoxazolyl or -benzthiazolyl middle component

Abstract

A water-soluble trisazo dyestuff of the formula B.sub.1 --N.dbd.N--Z--N.dbd.N--M--N.dbd.N--B.sub.2 is useful for dyeing substances containing nitrogen or hydroxyl wherein Z is ##STR1## M has the formula ##STR2## B.sub.1 and B.sub.2 are the same or different and are selected from the group consisting of ##STR3## X is ##STR4## --O-- or --s--; R.sub.1 is hydrogen, alkyl having 1 to 4 carbon atoms, phenyl or benzyl; R.sub.2 is hydrogen, alkyl or alkoxy having 1 to 4 carbon atoms; R.sub.3 and R.sub.4 are hydrogen, chloro, bromo, alkyl and alkoxy having 1 to 2 carbon atoms; E is a hydrogen atom, hydroxyl, amino, alkylamino having 1 to 4 carbon atoms, phenylamino, naphthylamino, benzoylamino, naphthoylamino, alkanoylamino having 2 to 5 carbon atoms, carboxyalkylamino having 2 to 3 carbon atoms, sulphoalkylamino having 1 to 2 carbon atoms, hydroxyalkylamino having 1 to 2 carbon atoms, dialkylamino having 1 to 4 carbon atoms in each alkyl, phenyl-alkylamino, naphthyl-alkylamino having 1 to 4 carbon atoms in the alkyl chains and alkanoyl-alkylamino having 1-4 carbon atoms in the alkyl and 2 to 5 carbon atoms in the alkanoyl group. R.sub.5 and R.sub.6 are the same or different and are selected from the group consisting of hydrogen, alkyl having 1-4 carbon atoms, alkoxy having 1-4 carbon atoms, nitro, sulpho, chloro, bromo, alkoxy-carbonyl having 2-5 carbon atoms and carboxyl with the proviso that at least one of M, B.sub.1 and B.sub.2 includes a sulpho substituent.

Dependencies are inferred from the claim text.