ULTRAVIOLET SHIELDING COMPOSITE FINE PARTICLES, METHOD FOR PRODUCING THE SAME, AND COSMETICS

摘要

The ultraviolet shielding composite fine particles having transparency in a visible light region include (a) matrix particles comprising an aggregate of primary particles having an average particle diameter of from 0.001 to 0.3 mu m, the aggregate being formed while the primary particles retain their shapes; and (b) daugther particles having an average particle diameter of from 0.001 to 0.1 mu m, the daughter particles being dispersed in and supported by the matrix particles. In the composite fine particles, the daugther particles have a smaller band gap energy than the particles constituting the matrix particles and are capable of absorbing ultraviolet light, and the resulting ultraviolet shielding composite fine particles have substantially no catalytic activities.