Emulsifier-free finely disperse systems of the oil-in-water and water-in-oil type
AssigneeBeiersdorf AG
InventorsHeinrich Gers-Barlag, Anja Müller
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, (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, and are dispersible both in water and in oil and which c) have optionally been coated on the surface, (4) at least one electrolyte and (5) at most 0.5% by weight of one or more emulsifiers.
Claims11
A Pickering emulsion, said Pickering emulsion being a finely dispersed water-in-oil or oil-in-water, said Pickering emulsion comprising
- a) an oil phase;
- b) an aqueous phase,
- c) microfine particles, said microfine particles:
- i) having an average particle size of less than 200 mm;
- ii) being dispersible both in water and oil;
- iii) having both hydrophilic and lipophilic properties resulting in amphiphilic character, and
- iv) which are 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;
- d) at least one electrolyte;
- and
- at most 0.5% by weight of one or more emulsifiers.
A method of stabilizing a cosmetic or dermatological Pickering emulsion, which comprising of:
- a) an oil phase;
- b) an aqueous phase,
- c) microfine particles, said microfine particles:
- i) having an average particle size of less than 200 nm;
- ii) being dispersible both in water and oil;
- iii) having both hydrophilic and lipophilic properties resulting in amphiphilic character;
- and
- iv) which are 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
- at most 0.5% by weight of one or more emulsifiers;
- which comprises of adding to said Pickering emulsion at least one electrolyte.
Dependencies are inferred from the claim text.