Loading patent…
AssigneeL'oreal
InventorFrances Pruche
Estimating the term…
Colouring composition, method for obtaining and using same for colouring skin and/or keratin matters. The composition comprises, in a physiologically acceptable medium, an efficient amount of at least one colouring agent precursor selected among the compounds comprising at least one aromatic cycle having at least two hydroxyl groups carried by two consecutive carbon atoms of the aromatic cycle, optionally an amino acid comprising at least one thiol group and an efficient amount of a catalytic system comprising a first component selected amongst salts and oxides of Mn(II) and/or Zn(II) and/or the mixtures thereof and a second component selected amongst alkaline hydrogenocarbonates, alkaline earth hydrogenocarbonates and the mixtures thereof, the proportions of the first component and the second component being such that: 1 [ Mn ( II ) ] [ HCO 3 ] ≤ 1 with [ Mn ( II ) ] ≠ 0 [ Zn ( II ) ] [ HCO 3 ] ≤ 1 with [ Zn ( II ) ] ≠ 0 [ Mn ( II ) + Z n ( II ) ] [ HCO 3 ] ≤ 1 with [ Mn ( II ) ] and [ Zn ( II ) ] ≠ 0 Application for colouring skin and/or keratin matters.
A composition for colouring skin and/or keratin fibres, characterized in that it comprises, in a physiologically acceptable medium, an efficient amount of at least one colouring agent precursor selected amongst the compounds comprising at least one aromatic cycle having at least two hydroxyl groups carried by two consecutive carbon atoms of the aromatic cycle, optionally an efficient amount of at least one amino acid comprising at least one thiol group and an efficient amount of a catalytic system comprising a first component selected amongst salts and oxides of Mn(II) and/or Zn(II) and/or the mixtures thereof, and a second component selected amongst alkaline hydrogenocarbonates, alkaline earth hydrogenocarbonates and the mixtures thereof, the proportions of the first component and the second component being such that:
A composition according to any one of the preceding claims, characterized in that the
A composition according to any one of preceding claims, characterized in that the Mn(II) and Zn(II) salts are selected amongst chloride, fluoride, iodide, sulfate, phosphate, nitrate, perchlorate, carboxylic acid salts and the mixtures thereof.
A composition according to any one of preceding claims, characterized in that the hydrogenocarbonate is selected amongst sodium hydrogenocarbonate, potassium hydrogenocarbonate, magnesium hydrogenocarbonate, calcium hydrogenocarbonate and the mixtures thereof.
A composition according to any one of preceding claims, characterized in that the aromatic cycle comprising at least two hydroxyl groups on two consecutive carbon atoms of the colouring agent precursor is a benzene cycle or a condensed aromatic cycle.
A composition according to any one of preceding claims, characterized in that the colouring agent precursor is present in an amount of at least 10 micromoles per milliliter of the composition.
A composition according to any one of preceding claims, characterized in that the amino acid(s) comprising at least one thiol group are selected amongst amino acids with an amine function in an α position relative to a carboxylic acid function.
A composition according to any one of preceding claims, characterized in that the amino acid(s) with a SH group/colouring agent precursor(s) molar ratio ranges from 0.001 to 50, preferably from 0.01 to 5, more preferably from from 0.05 to 2.5.
A composition according to any one of preceding claims, characterized in that the colouring agent precursor is a dihydroxyphenylalanine or a dihydroxyindole and the amino acid, the cysteine or the glutatione.
A composition according to any one of preceding claims, characterized in that the physiologically acceptable medium is a solubilizing medium of the colouring agent precursor and the amino acid, preferably having a bacteriostatic property.
A composition according to any one of preceding claims, characterized in that the physiologically acceptable medium comprises a solvent or a mixture of solvents of the colouring agent precursor and the amino acid.
A composition according to any one of preceding claims, characterized in that it is free of any chelating agent of the Mn (II) and/or Zn (II) salt.
A composition according to any one of preceding claims, characterized in that it has the form of two separate components, a first component comprising the catalytic system dissolved in a physiologically acceptable medium and a second component comprising the colouring agent precursor and optionally the amino acid having a thiol group dissolved in a physiologically acceptable medium.
A method for revealing the colouring of a somewhat or a non coloured basic composition, comprising, in a physiologically acceptable medium, at least one colouring agent precursor selected amongst compounds having at least two hydroxyl groups carried by two consecutive carbon atoms of the aromatic cycle, optionally at least one amino acid comprising at least one thiol group, characterized in that it involves adding to the basic composition, in the presence of oxygen, an efficient amount of a catalytic system comprising a first component selected amongst salts and oxides of Mn(II) and/or Zn(II) and the mixtures thereof and a second component selected amongst alkaline hydrogenocarbonates, alkaline earth hydrogenocarbonates and the mixtures thereof, the proportions of the first component and the second component being such that:
Dependencies are inferred from the claim text.