Water-soluble triazine black dyes free from cellulose reactive groups and suitable for use in inks

Abstract

A water-soluble dye, free from cellulose reactive groups, of the formula: ##STR1## wherein R.sup.1 is --(C.sub.a H.sub.2a O).sub.m (C.sub.b H.sub.2b O).sub.n H, R.sup.2 is H or --(C.sub.a H.sub.2a O).sub.m (C.sub.b H.sub.2b O).sub.n H, or R.sup.1 & R.sup.2 together with the nitrogen atom form a morpholine ring a & b are different and from 1 to 8 m is from 1 to 10; n is from 0 to 9; M is H, ammonium, or a monovalent metal; X (i) NR.sup.1 R.sup.2, (ii) NR.sup.3 R.sup.4, in which R.sup.3 and R.sup.4 are each independently selected from H, alkyl and aryl, or (iii) the residue of a mono- or bis-azo chromophore comprising benzene, naphthalene or mono- or bi-cyclic heteroaryl diazo and coupling components linked to the triazine nucleus through an amino linking group; and Y is (i) the residue of a benzene, naphthalene or mono or bi-cyclic heteroaryl diazo component or (ii) the residue of a mono- or bis-azo chromophore carrying a diazotisable amino group and comprising benzene, naphthalene or mono- or bi-cyclic heteroaryl diazo and coupling components; provided that the dye contains one or at least three azo groups and an ink derived from the dye which is suitable for use in printing, especially ink jet printing.

Dependencies are inferred from the claim text.