Hair colouring compositions and their use

A - Human Necessities – 61 – K

Patent

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A61K 7/13 (2000.01)

Patent

CA 2290565

Hair coloring compositions comprising: (i) one or more developers selected from amino aromatic systems capable of being oxidized and thereafter undergoing a single nucleophilic attack, and (ii) one or more couplers selected from (A) (1) naphthols having an active leaving group in the para- position relative to the -OH group, or (2) phenols with an active leaving group which is hydrogen which is para to the -OH group, (B) 1,3-diketones, or (C) pyrazolones, such that in the presence of an oxidizing agent the or each developer reacts with the or each coupler substantially only at the position having the active leaving group.

L'invention concerne des compositions pour coloration de cheveux, qui comportent: 1) un ou plusieurs développeurs sélectionnés dans le groupe des systèmes aromatiques amino capables de s'oxyder et pouvant ensuite être soumis à une seule attaque de nucléophiles; et 2) un ou plusieurs coupleurs sélectionnés dans le groupe formé par A) (1) des naphtols possédant un groupe partant actif en position para par rapport au groupe -OH, ou (2) des phénols possédant un groupe partant actif hydrogène en position para par rapport au groupe -OH; B) des 1,3-dicétones, ou C) des pyrazolones. Les compositions sont telles qu'en présence d'un agent oxydant, le/les développeur(s) réagi(ssen)t avec le/les coupleur(s) pratiquement seulement à la position présentant le groupe partant actif.

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