Method of coloring aluminum oxide layers
AssigneeClariant Finance (BVI) Limited
InventorKlaus Körte
Life of this patent
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Abstract
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, —COOM, —COOR5 or —CONH2, 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 highly lightfast dyeings in orange shades.
Claims15
Method of dyeing oxide layers produced artificially on aluminium or aluminium alloys, said method comprising applying a dye to the oxide layers, wherein the dye employed comprises at least one 1:2 chromium complex dye of the formula
- in which
- R signifies C1-9-alkyl or a radical of the formula
- R1 signifies C1-4-alkyl, —COOM, —COOR5 or —CONH2,
- 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
Dependencies are inferred from the claim text.