| 摘要 |
PURPOSE:To obtain the title multiple sol, excellent in dispersibility in dispersion media, long-term stability, ultraviolet-shielding ability etc., suitable for e.g. cosmetics, by adding hydrogen peroxide to a dispersion containing hydrated titanium dioxide and hydrated cerium oxide to make a solution followed by heating. CONSTITUTION:A hydrated titanium dioxide gel formed by neutralization hydrolysis of an aqueous solution of titanate such as titanium chloride and a hydrated cerium oxide gel formed by neutralization hydrolysis of an aqueous solution of cerium salt such as cerium nitrate are mixed with each other to prepare, e.g. by deflocculation, a dispersion containing hydrated titanium dioxide and hydrated cerium oxide. Thence, this dispersion is spiked with hydrogen peroxide and heated at pref. >=50 deg.C to dissolve said hydrated titanium dioxide and hydrated cerium oxide. The resultant solution is then heated to ca. >=60 deg.C to effect hydrolysis, thus obtaining the objective multiple sol. |
