Non-porous spherical silica and method for production thereof

摘要

Non-porous spherical silica having a mean particle diameter of 0.1-20 mum and satisfying the following conditions: (a) a maximum particle diameter is 4 times the mean particle diameter or less; (b) eta1/eta2<1.0, wherein eta1 and eta2 are the viscosity of a 70:30 (by weight) mixture of the non-porous spherical silica and a Bisphenol A type liquid epoxy resin, as measured at a rotation number of 0.5 rpm and 2.5 rpm, respectively, in a viscometer.