摘要 |
PROBLEM TO BE SOLVED: To provide a fine dispersion system capable of being used for cosmetics or dermatologic preparations and not containing an oil-in-water type and water-in-oil type emulsifier. SOLUTION: This pickering emulsion which is a water-in-oil type or oil-in- water type fine dispersion system comprises (1) an oily phase containing at least one oil component selected from the group of oils having viscosities of <30 mPa.s (measured at a shear gradient of 500/s and at a temperature of 25 deg.C) in an amount of at least 0.5 wt.% based on the weight of the oil phase, (2) an aqueous phase, (3) at least one kind of fine particles which have (a) an average particle diameter of <200 nm, exhibit (b) both the hydrophilic and lipophilic characteristics, namely an amphiphilic characteristic, and can be dispersed in both water and oils, and, if necessary, whose surfaces are coated, and (4) at most 0.5 wt.% of one or more emulsifiers.
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