Azo dyes

Abstract

The present invention relates to dyes of formula (1), wherein each of the residues D1 and D2 represents a radical of formula (2), wherein Ar1 represents the tetravalent radical of a carbocylic or heterocyclic aromatic compound, R1, R2 and R3 are each independently of the other hydrogen, C1-C12alkyl, C1-C12alkoxy, halogen, —OH, —CN, —NO2, —CF3, —SO3H, —NHCOR4, —COOR5, —CONR6R7, —SO2NR8R9, —NR10SO2R11, —SO2R13— or —ZCH2CH2Q, wherein Z is —O—, —SO2—, —NR12—, —CONH— or —NHCO—, Q represents —OH, C1-C12alkyl, —SO2R13—, —NHR14—, —OCH2CH2OH, —SO2CH2CH2OH or —NHCH2CH2OH, R4 is C1-C12alkyl, R5, R6, R7, R8, R9, R10, R12, R13 and R14 are each independently of the others hydrogen or C1-C12alkyl, and R11 is C1-C122alkyl, with the proviso that at least one of the residues D1 and D2 is a radical of formula (2) wherein R3 is —COOR5, —SO2NR8R9, —SO2R13— or —ZCH2CH2Q, dichromatic and trichromatic mixtures containing these dyes and the use of these dyes for dyeing or printing hydroxyl group-containing or nitrogen-containing fibre materials.

Dependencies are inferred from the claim text.