Composition for the oxidation dyeing of keratin fibers comprising at least one nonionic derivative of cellulose with at least one hydrophobic substituent, at least one nonionic, nonhydrophobic polymer of the hydroxyalkylcellulose type, and at least one oxidation dye, and oxidation dyeing process

A process for the oxidation dyeing of keratin fibers, comprising

• applying to the keratin fibers, for a period of time sufficient to develop a desired color, a dye composition, in the presence of at least one oxidizing agent, wherein the dye composition comprises, in a medium suitable for dyeing:
• (A) at least one nonionic derivative of cellulose comprising at least one hydrophobic substituent containing from 8 to 30 carbon atoms;
• (B) at least one nonionic, nonhydrophobic polymer of the hydroxyalkylcellulose type;
• and
• (C) at least one oxidation dye.

A multicompartment device, comprising

• at least one first compartment containing at least one dye composition, and
• at least one second compartment containing at least one oxidizing agent, wherein the dye composition comprises, in a medium suitable for dyeing:
• (A) at least one nonionic derivative of cellulose comprising at least one hydrophobic substituent containing from 8 to 30 carbon atoms;
• (B) at least one nonionic, nonhydrophobic polymer of the hydroxyalkylcellulose type;
• and
• (C) at least one oxidation dye.