Composition, useful for dyeing human keratin fibers, preferably hair, comprises fatty substances, cationic polymers, alkalizing and oxidizing agents and dyes e.g. direct dyes, where cationic polymers have specified average molecular weight
Composition comprises one or more fatty substances (at least 25%), one or more cationic polymers, one or more alkalizing agents, at least one oxidizing agent (>;= 5 wt.%) and optionally one or more dyes comprising oxidation dyes and/or direct dyes, where the cationic polymers have an average molecular weight of >;= 50000. Independent claims are included for: (1) dyeing or lightening human keratin fibers, comprising applying the composition to the fibers; (2) a two-compartment device comprising a first compartment containing a first composition comprising the fatty substance (>;= 30 (preferably >;= 60) wt.%) and optionally the dye, and a second compartment containing a second composition comprising the oxidizing agents, where the first and second compositions comprise cationic polymer and one or more basifying agents, and the compositions of the two compartments are intended to be mixed to give the composition prior to the application to the keratin fibers; and (3) a three-compartment device comprising the first composition comprising the fatty substance (>;= 30 (preferably >;= 50) wt.%), the second composition comprising the alkalizing agents and dyes, and a third composition comprising the oxidizing agents and optionally the fatty substance.La présente invention a pour objet une composition de coloration ou d'éclaircissement des fibres kératiniques humaines comprenant: (a) au moins 25 % en poids d'un ou plusieurs corps gras ; (b) un ou plusieurs polymères cationiques de masse moléculaire moyenne en poids inférieure ou égale à 50 000 ; (c) un ou plusieurs agents alcalinisants ; (d) au moins un agent oxydant en une teneur supérieure ou égale à 5% en poids et (e) éventuellement un ou plusieurs colorants choisis parmi les colorants d'oxydation, les colorants directs, ou leurs mélanges. Elle concerne de plus un procédé de coloration ou d'éclaircissement la mettant en œuvre. Un autre objet de l'invention est constitué par des dispositifs à deux ou trois compa