ULTRAFINE IRON-CONTAINING RUTILE TITANIUM DIOXIDE PARTICLE AND PROCESS FOR PRODUCING THE SAME.

摘要

Ultrafine iron-containing rutile titanium dioxide particles useable as ultraviolet-barrier cosmetics, medicinal compositions, coating materials and so forth, having an average single particle diameter of 0.01-0.1 mu m, and containing an iron component in the crystal grain thereof in an amount of 1-15 wt.% in terms of Fe based on titanium dioxide. The production process comprises coating the surface of titania of a minute titania sol having a rutile nucleus as the base particle by depositing an iron oxide or hydrated oxide on the surface, followed by firing and pulverization.