Ciba Specialty Chemicals Corporation

Basf Se Corporation

Julia Hauser

Victor Paul Eliu

Beate Fröhling

The present invention relates to novel cationic yellow dyes of formula (1) wherein Rand Rare each independently of the other a C-Calkyl radical or an unsubstituted or substituted benzyl radical, Ris hydrogen, C-Calkyl, C-Calkoxy, cyanide or halide, preferably hydrogen and X is an anion, with the proviso that at least one of the substitutents Ris a benzyl radical and Ris a methyl radical, Ris not hydrogen, also to compositions therof, especially comprising other dyes, to processes for the preparation therof and to the use therof in the dyeing of organic material, such as keratin, wool, leather, silk, cellulose or polyamides, especially keratin-containging fibres, cotton or nylon, and preferably human hair.

Yellow cationic dyes for dyeing of organic material

A process for the preparation of certain cationic azo compounds is described, as well as the use thereof for dyeing keratin-containing fibres, especially human hair, in which specific cationic azo dyes are used.

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Grenzach-Wyhlen, Germany

Julia Hauser