摘要 |
The invention comprises reactive monoazo dyes of formula <FORM:1033264/C4-C5/1> wherein A is a radical of the benzene series which may be sulphonated, Z is (a) an acyl radical bound to A via an amino group wherein the acyl radical is a - or b -halogeno-alkanoyl, a - or b -halogeno- or a ,b -dihalogeno-alkenoyl, a ,b -alkenoyl, halo-nitro-benzene-carbonyl- or -sulphonyl wherein the halogen is o- or pto the nitro substituent, or cyclic imide halide radical containing at least one reactive grouping <FORM:1033264/C4-C5/2> or (b) a b -hydroxyalkyl-sulphonyl- or -sulphamyl radical esterified with sulphuric acid, Y is hydrogen or a sulhonic acid group, M is an aromatic radical bound in o-position and m is 1, 2 or 3. The dyes are prepared (1) by coupling a diazonium compound of an amine Z-A-NH2 with an appropriate triazole compound (2) by oxidizing a disazo dye of formula <FORM:1033264/C4-C5/3> to the triazole compound, or (3) by acylating an aminoazo dye of formula <FORM:1033264/C4-C5/4> with an agent introducing the radical Z. The dyes may be used to colour natural and synthetic polyamide and particularly cellulose materials by the usual reactive dye processes in orange-red to violet-red shades. |