Emulsifier-free finely disperse systems of the oil-in-water and water-in-oil type
AssigneeBeiersdorf AG
InventorsHEINRICH GERS-BARLAG, ANJA MULLER
Life of this patent
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Abstract
Pickering emulsions, which are finely disperse systems of the water-in-oil or oil-in-water type, comprising (1) an oil phase which contains at least one wax and/or one oil thickener, (2) a water phase, (3) at least one type of microfine particles which a) have an average particle size of less than 200 nm, which b) display both hydrophilic and lipophilic properties, i.e. which have amphiphilic character, and are dispersible both in water and in oil and which c) have optionally been coated on the surface, and (4) at most 0.5% by weight of one or more emulsifiers.
Claims13
Pickering emulsions, which are finely disperse systems of the water-in-oil or oil-in-water type, comprising
- (1) an oil phase which contains at least one wax and/or one oil thickener,
- (2) a water phase,
- (3) at least one type of microfine particles which
- a) have an average particle size of less than 200 nm, which
- b) display both hydrophilic and lipophilic properties, i.e. which have amphiphilic character, and are dispersible both in water and in oil and which
- c) have optionally been coated on the surface, and
- (4) at most 0.5% by weight of one or more emulsifiers.
Pickering emulsions according to one of the preceding claims, characterized in that the content of the particles used is between 0.1% by weight and 30% by weight, based on the total weight of the preparations.
Pickering emulsions according to one of the preceding claims, characterized in that the particle diameter of the particles used is between 5 nm and 100 nm.
Pickering emulsions according to one of the preceding claims, characterized in that the particles used are chosen from the group consisting of amphiphilic metal oxides, boron nitride, microfine polymer particles and modified polysaccharides, it being possible for the particles to be present individually or as a mixture.
Pickering emulsions according to one of the preceding claims, characterized in that the particles used have been surface-treated to repel water, where the amphiphilic character of the particles is formed or retained.
Pickering emulsions according to one of the preceding claims, characterized in that the total amount of one or more waxes and/or oil thickeners in the finished cosmetic or dermatological preparations is chosen to be from the range of 0.5 to 20.0% by weight, preferably between 1.0 and 5.0% by weight, based on the total weight of the preparations.
Pickering emulsions according to one of the preceding claims, characterized in that the waxes and/or oil thickeners together with the other oil components of the preparations form a material which is pasty and spreadable at room temperature and which has a viscosity of more than 5000 mPa·s at 20° C.
Pickering emulsions according to one of the preceding claims, characterized in that the wax(es) is/are selected from the group consisting of the natural and/or synthetic, modified and/or unmodified waxes.
Pickering emulsions according to one of the preceding claims, characterized in that the oil thickener(s) is/are selected from the group consisting of the metal soaps and/or from the group consisting of the layered silicates.
Pickering emulsions according to one of the preceding claims, characterized in that they comprise auxiliaries which can contribute to reducing or preventing a dull or dry feel on the skin following their application.
Use of at least one wax and/or oil thickener in a cosmetic or dermatological preparation for reducing or preventing a dull or dry feel on the skin following its application.
Use of at least one wax and/or oil thickener for stabilizing a cosmetic or dermatological Pickering emulsion.
Dependencies are inferred from the claim text.