Magenta poly-azo compounds

Abstract

A compound of Formula (1) and salts thereof: Ar.sup.1 N.dbd.N--J--X--L--X--J--N.dbd.NAr.sup.2 (1) wherein: ##STR1## Ar.sup.1 and Ar.sup.2 are each independently aryl containing at least two carboxy groups; and L is a group of the Formula (3a) or (3b): ##STR2## in which T.sup.1 and T.sup.2 each independently is C.sub.1-4 -alkyl, C.sub.1-4 -alkoxy or C.sub.3-4 -alkenyl; T.sup.3 and T.sup.4 each independently is H, C.sub.1-4 -alkyl, C.sub.1-4 -alkoxy or C.sub.3-4 -alkenyl provided that T.sup.3 and T.sup.4 are not both H; each X independently is a group of the Formula (4), (5) or (6): ##STR3## each Z independently is H, halogen, alkyl, NR.sup.1 R.sup.2, SR.sup.3 or 0R.sup.3 ; each Y independently is Z, SR.sup.4 or OR.sup.4 ; each E independently is Cl or CN; and R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are each as defined in the specification. A compound of Formula (1) is suitable for use in the coloration of cellulosic substrates, such as paper, to give bright prints with good light and water fastness. It is especially suitable for use in the printing of paper by non-impact printing techniques, such as ink jet printing, especially thermal ink jet printing.

Dependencies are inferred from the claim text.