Azo dyes, a process for their preparation and their use in the dyeing or printing of hydrophobic fibre materials

Abstract

The present invention relates to an azo dye of formula (1), wherein R1 is the radical of a diazo component of the benzene, naphthalene, diphenyl, azobenzene, thiophene, benzothiazole, thiadiazole, indazole, benzatriazole, pyrazole, anthraquinone, naphtholic acid imide, chromone, phthalimide or diphenylene oxide series, R2 is an unsubstitued or substitued aryl radical or an unsubstituted or substituted aralkyl radical and R3 is an unsubstituted or substituted aryl radical or an unsubstituted or substituted aralkyl radical, with the proviso that one of the substituents R2 and R3 is an unsubstituted or substituted aryl radical and the other is an unsubstituted or substituted aralkyl radical, 2-hydroxy-2-phenylethyl being expected as a substituted aralkyl radical, to mixtures comprising at least two structually different azo dyes of formula (1) and to the use of those azo dyes and dye mixtures in the dyeing or printing of semi-synthetic or synthetic hydrophobic fibre materials.

Dependencies are inferred from the claim text.