| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface-treated silica particle which comprises fumed silica, has a controlled charging property and excellent charge-up rise properties, is excellent in fluidizing function and environmental stability and is useful as an external additive for an electrophotographic toner used for a copier, a laser printer or the like. SOLUTION: This surface-treated silica particle is produced by performing a dry contact treatment of fumed silica and a metal alkoxide to stick the latter on the surface of the former and then bringing the fumed silica into contact with water vapor to hydrolyze the metal alkoxide stuck on the surface. Preferably, the surface-treated silica particle thus obtained is hydrophobized. COPYRIGHT: (C)2004,JPO |
