PURPOSE: A skin cosmetic that is made by adding particles of hydrophobic titanium oxide, which are prepared by heating extremely fine particles of titanium oxide together with a monoester in a nonpolar solvent, to an oily cosmetic base, thus showing good effect of preventing skins from being burned with the sun, high water resistance and high safety.
CONSTITUTION: Extremely fine particles of titanium oxide whose maximum size is less than 0.1μ and average size is 30W40 millimicrons, and 2W20wt% of a monoester of R1COOR2 (R1 is residue of 11W23C fatty acid; R2 is residue of 12W 24 C higher alcohol) based on the particles are heated in a nonpolar solvent boiling at 66W260°C such as synthetic saturated branched hydrocarbons to prepare hydrophobic titanium oxide. Then, the resultant titanium oxide is added to an oily cosmetic base. Since the above hydrophobic titanium oxide has high effect of shielding ultraviolet rays, satisfactory sun-screening effect is obtained by use of a small amount and the safety of the skin is not damaged.
TAWARA SADAAKI
IWASAKI KOUICHIROU
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