| 摘要 |
A cosmetic compsn. comprises titanium dioxide nano-pigments coated with at least one aluminium deriv. in a cosmetically acceptable medium, which is virtually non-polar, has a conductivity of < 100 mu -Siemens and includes a fatty phase. The nano-pigments are pref. coated with 5-30 (pref. 5-20) wt.% w.r.t. TiO2 of aluminium and silicon derivs. There may be an additional coating, of pref. silicones, aminoacids, , to facilitate pigment dispersion. The nano-pigments measure ≤ 200 (pref. 100) nm and form 0.5-30 wt.% of the compsn. The fatty phase has a polarity index of > 24 mN/m, a dielectric constant of < 3, comprises a mixt. of oils or fats, pref. and forms 5-99.5 wt.% of the compsn. The cosmetically acceptable medium is anhydrous or is in the form of a water-in-oil or water-in-oil emulsion. The compsn. may contain salts in amt. such that the conductivity remains < 100 mu Siemens. It may also contain 0.01-2 % antioxidant. |
