Water-soluble formazan dye

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 is (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 (ii) a mono- or dis-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; R.sup.5 & R.sup.6 are selected from SO.sub.3 M and H provided at least one is SO.sub.3 M; R.sup.7 is H, halogen, C.sub.1-4 alkyl, C.sub.1-4 alkoxy, SO.sub.3 M or COOM; and R.sup.8 is H or SO.sub.3 M, a printing ink containing the dye and a method of printing.

Dependencies are inferred from the claim text.