Disazo dyestuffs containing A-O-alkylene-O-SO.sub.3 H group

Abstract

Disazo dyestuffs of formula ##STR1## in which A represents an alkylene radical with 2 - 5 C atoms, R.sub.1, r.sub.2, r.sub.3 and R.sub.5 represent hydrogen, chlorine, bromine, an alkoxy group or an alkyl group, R.sub.4 represents hydrogen, chlorine, bromine, alkyl, alkoxy or acylamino, R.sub.6 represents an alkyl group, R.sub.7 represents hydrogen or an alkyl group, B represents a 1,4-phenylene or 1,4-naphthylene radical and m represents the numbers 1 - 4, And their use for the dyeing of nitrogen-containing materials, such as wool and silk, but preferably for dyeing synthetic polyamide and polyurethane fibres. Dyeings obtained are characterized by good to very good general fastness properties.

Dependencies are inferred from the claim text.