Patent ID: 7820750
Filing Date: 2010-10-26
Classification: C01B,C01P,C04B,C09C,H01L

Abstract:
1. A silica powder at least having, in a volume-based frequency distribution of particle size as determined by a laser diffraction-scattering technique, a maximum frequency value for a mode peak 1 present in a particle size range extending from 1.5 to 3.5 μm and a maximum frequency value for a mode peak 2 present in a particle size range extending from 25 to 40 μm, wherein the maximum frequency value for the mode peak the mode peak the content of particles whose particle size ranges from 15 to 55 μm is larger than that of particles whose particle size ranges from 1 to 4 μm; the silica powder comprises: the shoulder for the mode peak