Emulsifier-free finely disperse systems of the oil-in-water and water-in-oil type
AssigneeBeiersdorf AG
InventorsHeinrich Gers-Barlag, Anja Müller
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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 comprises at least 0.5% by weight, based on the weight of the oil phase, of at least one oil component selected from the group consisting of oils having viscosities of less than 30 mPa·s, (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, and (4) at most 0.5% by weight of one or more emulsifiers.
Claims8
Pickering emulsions, which are finely disperse water-in-oil or oil-in-water systems, comprising
- (1) an oil phase which comprises at least 0.5% by weight, based on the weight of the oil phase, of at least one oil component chosen from the group of oils having a viscosity which is less than 30 mPa·s (measured at a shear gradient of 500/s and a temperature of 25° C.),
- (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 bydrophilic and lipophilic properties, (amphiphilic character), and are dispersible both in water and in oil and 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;
- (4) at most 0.5% by weight of one or more emulsifiers.
Dependencies are inferred from the claim text.