Disazo dyes suitable for use in ink jet printing

Abstract

Anionic azo compounds which, in the free acid form, have the Formula (1): ##STR1## Ar.sup.1 and Ar.sup.2 are each independently aryl or substituted aryl providing at least one of Ar.sup.1 and Ar.sup.2 has at least one substituent selected from COOH and COSH; each R.sup.1 and R.sup.2 is independently H, alkyl, substituted alkyl, alkenyl or substituted alkenyl; L is a divalent organic linking group; n is 0 or 1; each X independently is carbonyl or a group of the formula (2), (3) or (4): ##STR2## each Z independently is NR.sup.3 R.sup.4, SR.sup.5 or OR.sup.5 ; each Y independently is H, Cl, Z, SR.sup.6 or OR.sup.6 ; each E independently is Cl or CN; R.sup.3, R.sup.4, R.sup.5 and R.sup.6 are each independently H, alkyl, substituted alkyl, alkenyl, substituted alkenyl, aryl, substituted aryl, aralkyl, substituted aralkyl or R.sup.3 and R.sup.4 together with the nitrogen atom to which they are attached form a 5 or 6 membered ring; provided the compound of Formula (1) has at least as many groups selected from --COOH and --COSH as --SO.sub.3 H groups. The compounds are useful for the preparation of inks for use in ink-jet printing.

Dependencies are inferred from the claim text.