Process for dyeing keratinous fibers with 5,6-dihydroxyindole in combination with an iodide and a hydrogen peroxide composition at alkaline pH
AssigneeL'oreal
InventorsJean F. Grollier, Didier Garoche
Life of this patent
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Abstract
Process for dyeing keratinous fibres, characterized in that there is applied to these fibres at least one composition (A) containing, in an appropriate medium for dyeing, 5,6-dihydroxyindole in combination with iodide ions, the application of this composition (A) being preceded or followed by the application of a composition (B) which contains, in an appropriate medium for dyeing, hydrogen peroxide at an alkaline pH of less than 12.
Claims19
A plural stage process for dyeing keratinous fibers comprising applying to said fibers, in an amount effective to dye said keratinous fibers, a composition (A) containing, in an appropriate medium for dyeing, 5,6-dihydroxyindole, present in an amount ranging from 0.01 to 5 percent by weight, based on the total weight of said composition (A), and iodide ions, present in an amount ranging from 0.007 to 4 percent by weight, expressed as I.sup.- ions, based on the total weight of said composition (A), the application of said composition (A) being preceded or followed by applying to said fibers composition (B) containing, in an appropriate medium for dyeing, hydrogen peroxide at a concentration ranging from 1 to 40 volumes, at an alkaline pH of less than 12.
A keratinous fiber multicompartment dyeing kit comprising
- one first compartment containing a composition comprising, in an appropriate medium for dyeing, 5,6-dihydroxyindole, present in an amount ranging from 0.01 to 5 percent by weight based on the total weight of said composition, and iodide ions, present in an amount ranging from 0.007 to 4 percent by weight, expressed as I.sup.- ions, based on the total weight of said composition,
- a second compartment containing a composition comprising, in an appropriate medium for dyeing, hydrogen peroxide at a concentration ranging from 1 to 40 volumes, and
- a third compartment containing an aqueous medium at an alkaline pH,
- the contents of said third compartment intended to be mixed with the contents of said second compartment just before dyeing said keratinous fibres.
A keratinous fiber multicompartment dyeing kit comprising
- a first compartment containing a composition comprising in an appropriate medium for dyeing, iodide ions, present in an amount ranging form 0.007 to 4 percent by weight, expressed as I.sup.- ions, based on the total weight of said composition,
- a second compartment containing a composition comprising, in an appropriate medium for dyeing, 5,6-dihydroxyindole present in an amount ranging from 0.01 to 5 percent by weight based on the total weight of said composition,
- a third compartment containing a composition comprising, in an appropriate medium for dyeing, hydrogen peroxide at a concentration ranging from 1 to 40 volumes, and
- a fourth compartment containing an aqueous alkaline medium at a pH less than 12.
- the contents of said fourth compartment intended to be mixed with the contents of said third compartment, and the contents of said second compartment intended to be mixed with the contents of said first compartment, just before dyeing said keratinous fibers.
Dependencies are inferred from the claim text.