| 摘要 |
PURPOSE:To obtain a metallic hydrated oxide-coated talc with improved pigment characteristics such as dispersibility and color tone, by incorporating a water- soluble hydrolyzable metallic compound in a liquid dispersed with talc, followed by adjusting the pH. CONSTITUTION:A talc is dispersed in an aqueous solution containing an organic solvent (e.g., water-soluble alcohol, ketone, ether, ester, etc.) The resulting dispersion is incorporated with pref. 0.05-50wt% (as oxide) based on the talc, of one or more sorts of water soluble hydroxlyzable metallic compound (e.g., compound(s) of Ti, Al, Ce, Zn, Fe, Co, Si), followed by adding an acid or alkali to adjust the pH to develop a metallic hydrated oxide deposit on the surface of the talc particles, thus producing the objective coated talc. It is recommended that this talc should be heat-treated at 200-1,000 deg.C in the air or reducing atmosphere after drying. |
