Method for dyeing keratin fibres with oxidation dye precursors and direct powder dyes
AssigneeL'oreal
InventorsChristine Rondeau, Nicole Zemori
Life of this patent
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Abstract
A method for dyeing keratin fibers, particularly human keratin fibers, and more particularly hair. When the method is used, an extemporaneous mixture is applied on the fibers of a composition (A) containing one or more oxidation dye precursors and optionally one or more couplers, of a composition (B), in powder form, containing one or more direct dyes, preferably cationic, optionally dispersed in an organic pulverulent excipient and/or a mineral pulverulent excipient, and a composition (C) containing one or more oxidizing agents. The invention also features a ready-to-use composition of three components (A), (B), and (C) stored separately and mixed at the time of use to be applied on keratin fibers.
Claims40
A process for dyeing keratin fibers comprising applying an extemporaneous mixture to said keratin fibers, wherein said extemporaneous mixture comprises:
- (a) composition (a) containing at least one oxidation dye precursor and optionally at least one coupler, in a medium suitable for dyeing;
- (b) composition (b) in powder form containing at least one cationic direct dye, optionally dispersed in an excipient chosen from organic excipients and inorganic excipients;
- and
- (c) composition (c) containing at least one oxidizing agent in a medium suitable for dyeing,
- wherein composition (a), composition (b) and composition (c) are mixed extemporaneously at the time of application to said keratin fibers in a weight ratio of 1/0.01/0.5 to 1/1/4 respectively, and
- wherein the organic excipients and inorganic excipients are in either pulverulent or powder form.
A multi-compartment device for dyeing keratin fibers, comprising at least three compartments, wherein
- a first compartment contains composition (a) comprising at least one oxidation dye precursor and optionally at least one coupler, in a medium suitable for dyeing,
- a second compartment contains composition (b) in polyerulent or powder form comprising at least one cationic direct dye in powder form optionally dispersed in an excipient chosen from organic and inorganic excipients, and
- a third compartment contains composition (c) comprising at least one oxidizing agent in a medium suitable for dyeing,
- wherein said compositions (a), (b) and (c) are present in said device in parts by weight ranging for 1/0.01/0.5 to 1/1/4 respectively.
Dependencies are inferred from the claim text.