| 摘要 |
The invention concerns an agent for the oxidation-dyeing of hair, based on a developer/coupler combination which contains, as the developer, a diaminopyrazole derivative of general formula (I), in which R<1>, R<2> and R<4>, which may be the same or different, are hydrogen, an alkyl group with 1 to 4 carbon atoms, a hydroxyalkyl group with 2 to 4 carbon atoms, benzyl or phenyl and R<3> is hydrogen, an alkyl group with 1 to 4 carbon atoms or a hydroxyalkyl group with 2 to 4 carbon atoms, subject to the condition that the amino groups are in the 3,4- or 4,5-positions, or physiologically compatible water-soluble salts of this derivative; it also relates to novel diaminopyrazole derivatives. The compounds of formula (I) are physiologically extremely compatible developers which give hair a brilliant colour of considerable depth of hue in the red region of the spectrum. |
