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US 4,427,411 AGranted
Use of 1:2 chromium or cobalt complex dyes for dyeing leather or furs
AssigneeCiba-Geigy Corporation
InventorAlois Puntener
Life of this patent
Estimating the term…
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 red dye and a yellow dye for dyeing leather by the trichromatic process.
Claims6
A method of 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 and X is hydrogen, chlorine, methyl or methoxy, and in which the SO.sub.3 H groups are located in the 3-, 4-, 5- or 8-positions.
Dependencies are inferred from the claim text.