Composition for treating keratin fibers comprising an amphoteric or cationic polymer and neutralized fatty acid

A composition for dyeing and/or bleaching human keratin fibers comprising:

• a) at least 0.15% of at least one neutralized fatty acid,
• b) at least one non ionic surfactant,
• c) at least one non associative polymer chosen from amphoteric polymers, cationic polymers and mixture thereof,
• d) at least 10% by weight relative to the total weight of the composition, of at least one fatty substance other than fatty acids, wherein the fatty substances other than fatty acids are chosen from C6-C16 hydrocarbons, hydrocarbons comprising more than 16 carbon atoms, non-silicone oils of animal origin, triglycerides of plant or synthetic origin and mixtures thereof, and fatty alcohols which are solid at room temperature and at atmospheric pressure,
• e) at least one oxidizing agent,
• f) at least an alkaline agent, and
• g) optionally at least oxidation one dye precursor and/or at least one direct dye.