| 摘要 |
Asymmetrical 1:2 chromium complex dyes of formula (I), wherein X signifies - SO3M, -SO2NR1R2 or chlorine, Y signifies hydrogen, -SO3M or chlorine, R1 signifies hydrogen, C1-6-alkyl, C2-3-hydroxyalkyl or a radical of formulae (a) or (b), R2 signifies hydrogen, C1-6-alkyl or C2-3-hydroxyalkyl, or R1 and R2 together with the nitrogen atom to which they are attached, form a 5- or 6- membered saturated heterocycle, R3 signifies hydrogen, C1-2-alkyl, chlorine, - COOM or -SO3M, R4 signifies hydrogen, C1-2-alkyl, C1-2-alkoxy, chlorine or - SO3M, n signifies from 0 to 3, M signifies in each case hydrogen or a non- chromophoric cation, and M+ signifies hydrogen or a non-chromophoric cation, are useful for dyeing artificially produced oxide layers on aluminium or aluminium alloys, on which they produce grey dyeings in high colour yield and hue reproducibility.
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