| abstract |
The present invention relates to a cerium oxide solid solution having high UV blocking effect and transparency and having reduced catalytic activity. Specifically, metal ions having an ion radius larger than tetravalent cerium ions in cerium oxide and / or metal ions having lower valences than tetravalent cerium ions, such as Ca 2+ , Y 3+ , La 3+ , Nd 3+ Metal oxide solid solution cerium oxide in which, Eu 3+ , Tb 3+ , Sm 3+ , Mg 2+ , Sr 2+ , Ba 2+ and Ce 3+ are dissolved. This metal oxide solid solution cerium oxide is an aqueous solution of a metal salt of a cerium salt having a higher ion radius than a tetravalent cerium ion and / or a tetravalent cerium ion and an aqueous solution of a metal salt having a lower valence than a tetravalent cerium ion at a temperature of 60 ° C. or lower and a pH of 5 or higher. Prepared by reacting alkali and oxidant. In addition, this metal oxide solid solution cerium oxide can be blended into a resin composition or cosmetics to exert an ultraviolet blocking effect without impairing the transparency of the visible light region. |