| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a hollow alumina particle which can be used widely as heat insulation material and heat shielding material, and a heat insulating or heat shielding composition prepared using the same.SOLUTION: This invention provides a micro hollow alumina particle that has a shell for partition of a hollow chamber, the micro hollow alumina particle characterized in that the shape is nearly spherical, the average particle diameter is 1μm-20μm, the shell thickness is 500 nm or less, and 95% or more of particle-constituting components isαalumina.</p> |
