| abstract |
PURPOSE:To provide an anti-sunburn cosmetic containing a pigment coated with a polyvalent metal salt of p-methoxycinnamic acid, and having extremely high ultraviolet-shielding capability, high transparent feeling, good durability on the skin, and excellent dispersability and stability. CONSTITUTION:The objective anti-sunburn cosmetic contains a pigment (e.g. talc, titanium oxide, titanium mica, magnesium silicate, nylon, polypropylene, etc.) coated with a compound of formula (M is Al, Mg, Zn, Ca or Zr; n is atomic valence of M). The anti-sunburn cosmetic is free of permeation into the skin, has extremely excellent spreadability and color-developability, and is resistant to degradation with time on the skin. The coated pigment can be prepared by dispersing a pigment in an aqueous solution of a water-soluble polyvalent metal salt, adding an aqueous solution of an alkali metal salt of p-methoxycinnamic acid slowly and dropwise to the suspension under agitation, making the mixture alkaline, and continuing the agitation. The amount of the compound of formula applied to the pigment is 1-30wt% based on the pigment. |