Yellow hair color dyeing composition having improved wear...

A - Human Necessities – 61 – K

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A61K 8/41 (2006.01) A61K 8/49 (2006.01) A61Q 5/10 (2006.01)

Patent

CA 2422690

Oxidative dyeing of hair to a natural blonde or yellow coloration with exceptional wearing properties can be obtained y use of a system for oxidative hair coloring in which the hair coloring system utilizes a compound of the formula (I) wherein R1 and R2 are independently H; C1-4 alkyl, optionally substituted with one or more hydroxy- or amino groups; R1 and R2 may form a 5- or 6-membered heterocyclic ring, optionally containing one additional N- or O- heteroatom in the ring as a primary intermediate and a compound of the formula (II) wherein R1 and R2 are independently H; C1-4 alkyl or hydroxy-alkyl as a coupler and optionally a yellow direct dye or a known oxidative yellow dye.

On peut obtenir une coloration oxydative des cheveux en blond naturel ou en jaune avec des propriétés de résistance à la dégradation exceptionnelles en utilisant un système de coloration capillaire oxydative. Ce système de coloration capillaire utilise un composé représenté par la formule (I), dans laquelle R¿1? et R¿2? sont indépendamment H; C¿1-4? alkyle, éventuellement substitué avec un ou plusieurs groupes hydroxy- ou amino; R¿1? et R¿2? peuvent former un cycle hétérocyclique à 5 ou 6 branches, contenant éventuellement un N- ou O-hétéro-atome additionnel dans ce cycle sous forme d'intermédiaire primaire, et un composé représenté par la formule (II) dans laquelle R¿1? et R¿2? sont indépendamment H; C¿1-4? alkyle ou hydroxy-alkyle sous forme de coupleur et éventuellement un colorant direct jaune ou un colorant jaune oxydatif connu.

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