| 摘要 |
PURPOSE:To increase the make-up effect and infrared ray-shielding effect without any adverse effect by hydrolyzing a silver salt which coats the surface of inorganic powder particles to precipitate silver oxide or hydroxide and heat- treating the particles. CONSTITUTION:A slurry containing 1-50g/l of inorganic powder particles such as mica which have particle sizes of 0.01-500 microns and, when needed, are previously coated with a metal oxide (hydrate) is heated at 40-80 deg.C and combined with more than 0.01% of a silver salt, such as silver nitrate as a silver ion source. Then, an alkali such as sodium hydroxide is added in the course of 10 minutes to 2 hours to adjust the pH to 6-13 to hydrolyze the silver salt into silver oxide or hydroxide on the surface of the inorganic particles. Then, the particles are filtered and rinsed. The particles are dried and heat-treated at 105-1150 deg.C. |
