Use of 1:2 chromium of cobalt complex dyes for dyeing leather or furs
AssigneeCiba-Geigy Corporation
InventorAlois Puntener
Life of this patent
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Abstract
The dyes of the formula I indicated in patent claim 1 are suitable for dyeing furs and especially leather. They are preferably used as a mixture with a blue dye and a yellow dye for dyeing leather by the trichromatic process.
Claims7
A method for dyeing leather or furs, comprising the step of applying thereto a dye composition whose active dyeing ingredient consists essentially of a dye of the formula ##STR34## in which Me is chromium or cobalt, Ka.sup..sym. is a cation, m is 1 or 2, n is 0, 1 or 2 and Y is methyl, --CONH.sub.2 or --CO--NH--R, wherein R is an alkyl group having 1-4 C atoms, and wherein each of the nitro groups is located at a 5-position or a 6-position.
Dependencies are inferred from the claim text.