Composition for oxidation dyeing of human keratin fibres at a pH of less than 8, comprising a fatty alcohol, a fatty ester and a cationic surfactant, method using same and device

A ready-to-use composition obtained by contemporaneous mixing, before application, of a dyeing composition, with at least one composition comprising at least one oxidizing agent,

• wherein the dyeing composition comprising, at a pH less than 8, in a cosmetically acceptable medium,
• at least one oxidative dye precursor;
• at least one cationic surfactant;
• at least one fatty acid ester;
• and
• at least one fatty alcohol,
• wherein the at least one fatty alcohol is chosen from the non-(poly)oxyalkylenated and non-(poly)glycerolated saturated and unsaturated fatty alcohols,
• and wherein the weight ratio of the at least one fatty alcohol to the at least one fatty acid ester is greater than 2:1 and less than 10:1.

A method of coloring human keratin fibers, comprising applying a ready-to-use composition to the keratin fibers,

• wherein the keratin fibers are dry or damp,
• wherein the ready-to-use composition is obtained by contemporaneous mixing, before application, of a dyeing composition,
• with at least one composition comprising at least one oxidizing agent,
• wherein the dyeing composition comprises, at a pH less than 8, in a cosmetically acceptable medium,
• at least one oxidative dye precursor;
• at least one cationic surfactant;
• at least one fatty acid ester;
• and
• at least one fatty alcohol,
• wherein the at least one fatty alcohol is chosen from the non-(poly)oxyalkylenated and non-(poly)glycerolated saturated and unsaturated fatty alcohols,
• and wherein the weight ratio of the at least one fatty alcohol to the at least one fatty acid ester is greater than 2:1 and less than 10:1.

A method of coloring human keratin fibers, comprising applying to the keratin fibers a dyeing composition in the presence of an oxidizing composition comprising at least one oxidizing agent;

• wherein the oxidizing composition is applied to the keratin fibers before or after said dyeing composition without intermediate rinsing, wherein the dyeing composition comprises, at a pH less than 8, in a cosmetically acceptable medium,
• at least one oxidative dye precursor;
• at least one cationic surfactant;
• at least one fatty acid ester;
• and
• at least one fatty alcohol,
• wherein the at least one fatty alcohol is chosen from the non-(poly)oxyalkylenated and non-(poly)glycerolated saturated and unsaturated fatty alcohols,
• and wherein the weight ratio of the at least one fatty alcohol to the at least one fatty acid ester is greater than 2:1 and less than 10:1.

A device comprising

• at least one first compartment comprising at least one dyeing composition, and
• at least one second compartment comprising at least one oxidizing agent wherein the at least one dyeing composition comprises at a pH less than 8, in a cosmetically acceptable medium,
• at least one oxidative dye precursor;
• at least one cationic surfactant;
• at least one fatty acid ester;
• and
• at least one fatty alcohol,
• wherein the at least one fatty alcohol is chosen from the non-(poly)oxyalkylenated and non-(poly)glycerolated saturated and unsaturated fatty alcohols,
• and wherein the weight ratio of the at least one fatty alcohol to the at least one fatty acid ester is greater than 2:1 and less than 10:1.