| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an environmentally friendly, simple and inexpensive method for manufacturing a tabular boehmite-based and tabular alumina-based powder capable of controlling a particle diameter, an aspect ratio and a form, and to provide a tabular powder having hydrophobicity and cosmetics having excellent feeling of use that are blended with the tabular powder. <P>SOLUTION: In the production of tabular boehmite having a polygonal plate surface, a mean particle diameter between 1μm and 30μm and an aspect ratio (mean primary particle diameter/average thickness) between 2 and 50, a water-soluble aluminum compound is dissolved in water so that the concentration thereof is in the range of from 0.05 mol/L to 0.2 mol/L, added with sodium hydrogencarbonate and sodium carbonate so that the mole ratio of an aluminum ion and a sodium ion is in between 1:2 and 1:10, and is subjected to hydrothermal reaction for 1-30 hours under the condition of from 180°C to 300°C. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
