Patent ID: 6723136
Filing Date: 2004-04-20
Classification: A61K,A61Q

Abstract:
A composition for the coloration of keratin fibres comprising, in a physiologically acceptable medium, an efficacious quantity of at least one colouring material precursor selected from the compounds containing at least one aromatic ring having at least two hydroxyl groups borne by two adjacent carbon atoms of the aromatic ring, an efficacious quantity of at least one oxidation base of the para or ortho type selected from the aromatic amines, and an efficacious quantity of a catalytic system comprising a first constituent selected from the group consisting of salts and oxides of Mn(II) and/or Zn(II) and their mixtures, and a second constituent selected from the group consisting of alkali hydrogen carbonates, alkaline earth hydrogen carbonates and their mixtures, the proportions of the first constituent and the second constituent being such that: [M&it;â€ƒ&it;n&af;(I&it;â€ƒ&it;I)][H&it;â€ƒ&it;C&it;â€ƒ&it;O3]&leq;1&it;â€ƒ&it;with&it;â€ƒ[M&it;â€ƒ&it;n&af;(I&it;â€ƒ&it;I)]&NotEqual;0where [(Mn(II)], [Zn(II)] and [HCO3] respectively represent the molar concentrations of Mn(II), Zn(II) and HCO3 wherein [Z&it;â€ƒ&it;n&af;(I&it;â€ƒ&it;I)][H&it;â€ƒ&it;C&it;â€ƒ&it;O3]&leq;1&it;â€ƒ&it;with&it;â€ƒ[Z&it;â€ƒ&it;n&af;(I&it;â€ƒ&it;I)]&NotEqual;0&it;â€ƒ&it;and[M&it;â€ƒ&it;n&af;(I&it;â€ƒ&it;I)+[Z&it;â€ƒ&it;n&af;(I&it;â€ƒ&it;I)][H&it;â€ƒ&it;C&it;â€ƒ&it;O3]&leq;1&it;â€ƒ&it;with&it;â€ƒ[M&it;â€ƒ&it;n&af;(I&it;â€ƒ&it;I)&it;â€ƒ&it;and&it;â€ƒ[Z&it;â€ƒ&it;n&af;(I&it;â€ƒ&it;I)]&NotEqual;0.