Emulsifier-free finely dispersed systems of the water-in-oil type
AssigneeBeiersdorf AG
InventorsHeinrich Gers-Barlag, Anja Müller
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Abstract
Emulsifier-free cosmetic or dermatological preparations, which are finely dispersed systems of the oil-in-water type, comprising 1. an oil phase, 2. an aqueous phase and 3. one or more types of micronized, inorganic pigments which a) have an average particle size of less than 200 nm, and whose particles b) have both hydrophilic and lipophilic properties, i.e. have an amphiphilic character, and thus position themselves at the water/oil interface, and which c) are selected from the group consisting of metal oxides, which d) are optionally coated on the surface and also optionally comprising further cosmetic or pharmaceutical auxiliaries, additives and/or active ingredients.
Claims10
An emulsifier-free cosmetic or dermatological preparation, which preparation is a finely dispersed oil-in-water system, said preparation comprising
- a) an oil phase;
- b) an aqueous phase;
- and
- c) micronized, inorganic pigments particles positioned at an interface of said oil phase and said aqueous phase, said micronized, inorganic pigment particles:
- i) have an average particle size of less than 200 nm;
- ii) have both hydrophilic and lipophilic properties resulting in an amphiphilic character;
- and
- iii) selected from the group consisting of metal oxides, which are coated on the surface thereof with:
- (A) a dimethylpolysiloxane and/or silica gel;
- and
- (B) aluminium hydroxide and/or alumina and/or silicon dioxide;
- and
- d) optionally cosmetic or pharmaceutical auxiliaries, additives and/or active substances.
Dependencies are inferred from the claim text.