Composition containing waxes and an hydrophilic active unstable in an oxidizing medium and cosmetic use thereof

摘要

The composition comprises at least one aqueous phase and at least one oil phase (preferably in amount 10-75 wt.%) containing at least 1 (preferably 5-20) wt.% (per total wt. of composition) of one or more wax components. The oil phase, before mixing with aqueous phase, has form of supple paste at ambient temperature, and aqueous phase contains at least one active hydrophilic component unstable in oxidizing medium. The composition, which may also contain one or more fillers, is in emulsion form, preferably water/oil type, and may constitute cosmetic or dermatological product. Independent claims are also included for: (1) the cosmetic process of treatment and/or cleaning and/or protection of skin, mucous membranes and/or keratinic fibers, comprising application of the claimed composition; (2) use of composition for treatment and/or cleaning and/or protection of skin, mucous membranes and/or keratinic fibers; (3) use of the composition for preparation of cosmetic composition for treatment and/or cleaning and/or protection of skin, mucous membranes and/or keratinic fibers; (4) use of at least 1 wt.% of one or more wax components in the composition comprising oil phase in form of supple paste at ambient temperature, and aqueous phase with at least one active hydrophilic agent unstable in oxidizing medium, to stabilize such hydrophilic agent; and (5) preparation of the composition, using at least at one stage mixer/screw extruder or cylindrical grinder, and comprising (i) preparation of oil phase in form of supple paste obtained by heating wax component(s) (and optional other components of oil phase) up to or beyond their melting point, introducing molten mixture into mixer/screw extruder or cylindrical grinder and cooling to ambient temperature during mixing process (optional other components of oil phase can be introduced at this stage), (ii) optional addition of emulsifying system to obtained paste, and (iii) incorporation, with mixing, of aqueous phase, containing hydrophilic agent, into oil phase obtained at stage (1), or of oil phase into aqueous phase.