PREPARATION OF NOVEL CERIUM PHOSPHATE WHITE PIGMENT

Catalytically active cerium dioxide is used as light reflection materials for cosmetic applications. Therefore, cosmetics containing this pigment cause oxidation of the skin. From this fact, the substitute for cerium dioxide is required to prepare the cosmetics without catalytic activity. Herein, as novel white pigments for use in cosmetics, cerium phosphate was prepared at various pH values. The chemical composition, powder properties, catalytic activity, color, and smoothness of the cerium phosphate were evaluated. All samples prepared in this work indicated XRD pattern of the cerium phosphate hydrate. The sample prepared at pH 4 had relatively small particles and low static friction resistance. The samples prepared at pH 5, 6, and 7 had no photocatalytic activity. The samples prepared at pH 5 and 6 exhibited high reflectance within the range of visible light. (Received Nov 20, 2018; Accepted Dec 17, 2018)