1:2 chromium complex dyes, the production and use thereof

C - Chemistry – Metallurgy – 09 – B

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C09B 45/16 (2006.01) C25D 11/24 (2006.01)

Patent

CA 2291196

The invention relates to 1:2 chromium complex dyes of formula (I), in which R is C1-9 alkyl or a radical of formula (a) or (b), R1 is C1-4-alkyl, R2 is hydrogen or -SO3M, R3 is hydrogen, methyl or methoxy, R4 is hydrogen, methyl, methoxy or chlorine, n is 0-3, M is hydrogen or a non-chromophoric cation, and Kat+ is hydrogen or a non- chromophoric cation. Said dyes can be used for dying artificially produced oxyde films on aluminium or aluminium alloys, on which they yield highly light-fast colouring in yellow tones.

L'invention concerne des colorants complexes 1:2 au chrome de formule (I), formule dans laquelle R représente alkyle C1-9 ou un reste de formule (a) ou (b), R1 représente alkyle C1-4, R2 représente hydrogène ou -SO3M, R3 représente hydrogène, méthyle ou méthoxy, R4 représente hydrogène, méthyle, méthoxy ou chlore, n vaut 0 à 3, M représente hydrogène ou un cation non chromophore et Cat<+> représente hydrogène ou un cation non chromophore. Ces colorants conviennent à la coloration de couches d'oxyde générées artificiellement sur de l'aluminium ou des alliages d'aluminium sur lesquels ils donnent des colorations dans les tons jaunes présentant une grande solidité à la lumière.

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