Oxidation dye composition comprising at least one mesomorphic phase, process for preparing it and ready-to-use composition for dyeing keratin materials

A process for preparing a dye composition comprising:

• a) preparing at least one mesomorphic phase by mixing at least one nonionic surfactant with an HLB value of less than or equal to 10 in an amount ranging from 10% to 20% by weight, relative to the weight of the dye composition, with water and optionally with at least one fatty alcohol, the at least one mesomorphic phase chosen from inverse hexagonal phases (H2), lamellar phases (Lβ) and inverse cubic phases (I2 and V2), and
• b) adding at least one oxidation dye to the at least one mesomorphic phase,
• wherein ammonia is added in step a), step b), or both.

A ready-to-use composition for the oxidation dyeing of keratin fibers, comprising, in a medium suitable for dyeing, at least one dye composition (A) comprising at least one oxidation dye, ammonia, and at least one mesomorphic phase present in composition (A) in an amount greater than or equal to 10% by weight, relative to the weight of composition (A), the at least one mesomorphic phase comprising at least one nonionic surfactant with an HLB value of less than or equal to 10 in an amount ranging from 10% to 20% by weight, relative to the weight of composition (A), and at least one composition (B) comprising at least one oxidizing agent, the at least one mesomorphic phase chosen from inverse hexagonal phases (H2), lamellar phases (Lβ) and inverse cubic phases (I2 and V2).

An oxidizing composition, comprising at least one oxidizing agent chosen from hydrogen peroxide, urea peroxide, alkali metal bromates and ferricyanides, persalts, and redox enzymes, optionally in the presence of the respective donor or co-factor thereof, and at least one mesomorphic phase chosen from inverse hexagonal phases (H2), lamellar phases (Lβ) and inverse cubic phases (I2 and V2), wherein the at least one mesomorphic phase is present in the oxidizing composition in an amount greater than or equal to 10% by weight, relative to the total weight of the oxidizing composition, the at least one mesomorphic phase comprising at least one nonionic surfactant with an HLB value of less than or equal to 10 in an amount ranging from 10% to 20% by weight, relative to the weight of the dye composition.

A method for dyeing keratin fibers, comprising applying to wet or dry keratin fibers, a ready-to-use composition comprising, in a medium suitable for dyeing, at least one composition (A) comprising at least one oxidation dye, ammonia, and at least one mesomorphic phase present in composition (A) in an amount greater than or equal to 10% by weight, relative to the total weight of composition (A), the at least one mesomorphic phase comprising at least one nonionic surfactant with an HLB value of less than or equal to 10 in an amount ranging from 10% to 20% by weight, relative to the weight of composition (A), the at least one mesomorphic phase chosen from inverse hexagonal phases (H2), lamellar phases (Lβ) and inverse cubic phases (I2 and V2), and at least one composition (B) comprising at least one oxidizing agent, wherein the ready-to-use composition is prepared extemporaneously at the time of use, and wherein the ready-to-use composition is left on the keratin fibers to act for a leave-in time ranging from 1 to 60 minutes approximately, rinsing the fibers and then optionally washing them with shampoo, then rinsing them again and drying them.

A multi-compartment kit for the oxidation dyeing of keratin fibers, comprising at least two compartments, wherein at least one compartment contains at least one dye composition comprising at least one oxidation dye, ammonia, and at least one mesomorphic phase present in the dye composition in an amount greater than or equal to 10% by weight, relative to the total weight of the dye composition, the at least one mesomorphic phase comprising at least one nonionic surfactant with an HLB value of less than or equal to 10 in an amount ranging from 10% to 20% by weight, relative to the weight of the dye composition, the at least one mesomorphic phase chosen from inverse hexagonal phases (H2), lamellar phases (Lβ) and inverse cubic phases (I2 and V2), and at least one other compartment contains a composition comprising at least one oxidizing agent.