DISAZO DYESTUFFS AND THEIR USE IN DYEING POLYESTERS AND CELLULOSE FIBRES

摘要

Disazo dyes of the general formula I IMAGE I where R is an araliphatic or aromatic radical, X1 is IMAGE X2 is hydrogen, phenyl or an aliphatic or araliphatic radical, R1 is hydrogen or an aliphatic, cycloaliphatic, araliphatic or aromatic radical, the rings A, B and C may be substituted and the rings B and C may carry a fused benzo ring, and the group IMAGE may also be a heterocyclic radical of the formula IMAGE The novel dyes are very suitable for dyeing polyesters and cellulose.