Azo dyestuffs containing an amino or acylated amino naphthol di-sulfonic acid radical and at least one reactive phosphoric or phosphonic acid group

Abstract

Azo dyestuffs of the formula: ##STR1## wherein A is a phenylene or naphthalene nucleus containing at least one phosphoric or phosphonic acid group; R.sub.1 and R.sub.2 are hydrogen or --SO.sub.3 H; and R.sub.3 -R.sub.6 are hydrogen, --SO.sub.3 H, or NR.sub.7 Q wherein R.sub.7 is hydrogen or lower alkyl and Q is hydrogen or an acyl group of 2 to 8 carbon atoms, at least two of R.sub.1 -R.sub.6 being --SO.sub.3 H and at least one being --NHQ, provided that when the dyestuff is monoazo, then Q is an acyl group of 3 to 8 carbons and when the dyestuff is disazo, Q is hydrogen or an acyl group of 2 to 8 carbon atoms. The dyestuff may be used to reactively dye cellulosic materials, e.g., cotton or cotton/polyester blends. The dyestuffs are particularly useful in dyeing mixed fabrics of cellulose and synthetics together with disperse dyes from a single bath.

Dependencies are inferred from the claim text.