Silicia powder and method for producing the same

摘要

(Object) To provide a silica powder having a good ability to adsorb an ink dye. (Solving MeansÜ A silica powder surface-treated with and epoxy compound having a plurality of epoxy groups, in which at least one epoxy group of the epoxy compound is ring-opened to bind to the surface of the silica powder and the remaining epoxy groups of the epoxy compound are bonded to amine compounds. The silica powder can be produced by the surface treatment of a silica powder with an epoxy compound and an amine compound successively or with both these compounds simultaneously. The surface treatment of the silica powder is performed with 0.1 to 60 parts by weight of an epoxy compound having at least two epoxy groups and 0.1 to 50 parts by weight of an amine compound in an inert gas atmosphere at 90 to 200 DEG C.