| 摘要 |
1:2 chromium complex dyes of the formula:in which R signifies C1-9-alkyl or a radical of the formula:R1 signifies C1-4-alkyl,R2 signifies hydrogen or -SO3M,R3 signifies hydrogen, methyl or methoxy,R4 signifies hydrogen, methyl, methoxy or chloro,n signifies from 0 to 3,M signifies hydrogen or a non-chromophoric cation and Kat+signifies hydrogen or a non-chromophoric cation, are suitable for dyeing artificially produced oxide layers on aluminium or aluminium alloys and so give rise to highly lightfast dyeings in yellow shades.
|
