METHOD silicon oxide-coated zinc oxide and its preparation and silicon oxide-coated zinc oxide containing compositions and cosmetic

The present invention, even in the silica coating formed with alkali metal silicates, silicon oxide-coated zinc oxide and its production method and a silicon oxide-coated zinc oxide containing composition eluted zinc ion is suppressed and cosmetic It is provided. Silicon oxide-coated zinc oxide of the present invention is a silicon oxide-coated zinc oxide formed by the surface of the zinc oxide particles coated with silicon oxide film, the average primary particle diameter 50nm of the zinc oxide particles exceeds and in 500nm or less There, and definitive when held for 1 hour in a buffer solution of pH = 5, the dissolution rate S of zinc oxide defined by the following formula (1) is 50% or less. Dissolution rate S = (eluted amount of zinc oxide) / (the amount of zinc oxide of silicon oxide-coated oxide in the zinc) ... (1)