POROUS SILICA PARTICLE HAVING SURFACE SMOOTHNESS, MANUFACTURING PROCESS OF THE POROUS SILICA PARTICLE, AND COSMETIC MIXED WITH THE POROUS SILICA PARTICLE

摘要

PPROBLEM TO BE SOLVED: To provide a porous silica particle having an excellent surface smoothness, a manufacturing process thereof, and a cosmetic mixed with the porous silica particle. PSOLUTION: The porous silica particle has an average particle diameter of 0.5-30 m, and has surface smoothness to such an extent that almost no foreign matter adhered to its surface is observed when the observation is made on an image of the entire surface of the particle photographed under a scanning electron microscope (a SEM image) with a magnification of 10,000. The manufacturing process of the porous silica particle is presented. The cosmetic contains the porous silica particle. PCOPYRIGHT: (C)2009,JPO&INPIT