Spherical alumina powder and resin composition using the same

A low viscosity when highly filled in a resin, and due to the aging of the spherical alumina powder after surface treatment, to provide a spherical alumina powder viscosity increase is small in the resin composition. A spherical alumina powder having an alkyl group derived from the silane compound to the surface, infrared spectroscopy peak (2960 ± 5 cm due to the asymmetrical vibration of CH3 in the alkyl group of the silane compound in the same spectral data obtained by the measurement spherical