Importance

Loading Importance Indicators...

Abstract

The present invention relates to the metal oxide doped cerium oxide which has an excellent ultraviolet ray shielding effect and a transparency and whose catalytic activity is reduced. More in detail, relates to the metal oxide doped cerium oxide composed of cerium oxide in which metal ion having larger ion radius than that of Ce.sup.4+ and/or lower valence metal ion than Ce.sup.4+, such as Ca.sup.2+, Y.sup.3+, La.sup.3+, Nd.sup.3+, Eu.sup.3+, Tb.sup.3+, Sm.sup.3+, Mg.sup.2+, Sr.sup.2+, Ba.sup.2+, Ce.sup.3+ and so on are doped. Said metal oxide doped cerium oxide can be prepared at the temperature lower than 60.degree. C. and in the condition of pH higher than 5 by reacting aqueous solution of cerium salt, aqueous solution of metal ion having larger ion radius than that of Ce.sup.4+ and/or lower valence metal ion than Ce.sup.4+ and alkali, then adding oxidizing agent. Further, said metal oxide doped cerium oxide can be blended to resin composition or cosmetic composition and can display and ultraviolet shielding effect without spoiling transparency at visible ray region.

Loading the Abstract Image...

First Claim