Hair colouring compositions and their use

A - Human Necessities – 61 – K

Patent

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A61K 7/13 (2000.01)

Patent

CA 2290604

Hair colouring compositions are provided which comprise (i) one or more developers selected from amino aromatic systems capable of being oxidised and thereafter undergoing a single electrophilic attack, and (ii) one or more couplers selected from (A) phenols and naphthols having an active leaving group in the <u>para</u> position relative to the hydroxyl group, (B) 1,3- diketones containing the group (a) in which Z is an active leaving group, and (C) compounds containing the group (b) in which Z is an active leaving group, and X is an active leaving group or a non-leaving substituent, such that in the presence of an oxidising agent the or each developer reacts with the or each coupler substantially only at the positions having the active leaving group Z and, if X is an active leaving group, X, and (iii) an antioxidant. Use of an antioxidant with these colouring agents gives good fade resistance. A kit, method and system for colouring hair are also provided using these colouring agents.

L'invention concerne des compositions pour colorations capillaires comprenant (i) un ou plusieurs développeurs choisis parmi des systèmes aromatiques aminés pouvant être oxydés pour être ensuite soumis à une seule attaque électrophile, et (ii) un ou plusieurs coupleurs choisis parmi (A) des phénols et des naphtols possédant un groupe partant actif en position <u>para</u> par rapport au groupe hydroxy, (B) des 1,3-dicétones contenant le groupe (a), dans lequel Z est un groupe partant actif, et (C) des composés contenant le groupe (b), dans lequel Z est un groupe partant actif, et X est un groupe partant actif ou un substituant non partant, de manière telle qu'en présence d'un agent oxydant, le ou chaque développeur réagit avec le ou chaque coupleur sensiblement uniquement au niveau des positions ayant le groupe partant actif Z et, si X est un groupe partant actif, X, et (iii) un antioxydant. L'utilisation d'un antioxydant avec ces agents de coloration confère une bonne résistance à la décoloration. L'invention concerne également un kit, un procédé et un système de coloration capillaire utilisant ces agents de coloration.

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