Hair colouring compositions and their use

A - Human Necessities – 61 – K

Patent

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A61K 7/13 (2000.01)

Patent

CA 2290605

Hair colouring compositions which are of reduced harshness to skinand hair are provided which comprise: (i) one or more developers selected from aminoaromatic 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 para position relative to the hydroxy group, (B) 1,3-diketone derivatives having an active leaving group, or (C) pyrazolone derivatives having an active leaving group, 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, and (iii) an inorganic peroxygen agent in an amount of from about 0.0001 to about 0.05 moles per 100 g of composition. Alternative compositions may contain higher levels of oxidizing agent provided that they have a pH below 6.

L'invention concerne des compositions pour colorations capillaires caractérisées par un dessèchement réduit de la peau et des cheveux, lesquelles compositions comprennent (i) un ou plusieurs développeurs choisis parmi des systèmes aromatiques aminés capables d'être oxydés pour être soumis ensuite 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 dérivés de 1,3-dicétones possédant un groupe partant actif, ou (C) des dérivés de pyrazolone possédant un groupe partant actif, 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 possédant le groupe partant actif, et (iii) un agent peroxygéné inorganique à raison d'environ 0,0001 à environ 0,05 moles par 100 g de composition. D'autres compositions peuvent renfermer des teneurs d'agents oxydants plus élevées pour autant qu'elles aient un pH inférieur à 6.

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