| abstract |
An amorphous spherical silica / aluminum oxide obtained by spray-combusting siloxane and an organoaluminum compound in a flame, having a specific surface area of 10 to 100 m 2 / g and containing 1 to 99% by mass of aluminum oxide. An electrostatic charge image developer containing composite oxide fine particles. [Effects] According to the present invention, by using purified siloxane and organoaluminum compound, which do not contain halogen, as raw materials, high purity amorphous spheres of silica and aluminum oxide which are substantially free of chlorine. Composite oxide fine particles are obtained. [Selection figure] None |