| 摘要 |
PROBLEM TO BE SOLVED: To obtain the subject fine powder having high hydrophobic property, capable of arbitrarily controlling electron charge amount according to treating conditions by treating metal oxide fine powder with a specific surface treating agent. SOLUTION: This fine powder is obtained by treating (A) metal oxide fine powder (preferably silica, titania or alumina, preferably having 10-400 m<2> /g specific surface area) with (B) an epoxy group-containing silane (e.g.θ- glycidoxypropyltrimethoxysilane), (C) an amino group-containing organic compound (preferably monoamine, diamine or the like) and (D) both terminal reactive groups-blocked type organopolysiloxane, preferably represented by the formula [R is methyl or ethyl; X is a halogen or the like; (n) is an integer of 15-500]. Furthermore, total amount of components B to D used is preferably 2-100 wt.% based on the component A to be treated. As a result, the fine powder hardly causes change in electron charge and it can be expected that the powder keeps excellent performance over a long period.
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