| 摘要 |
PROBLEM TO BE SOLVED: To provide a particle composition comprising metal oxide particles surface-treated with a hydrophobicity-imparting agent, and a production method of the metal oxide particles.SOLUTION: The particle composition comprises metal oxide particles surface-treated with a first hydrophobicity imparting agent in a basic aqueous dispersion, in which the surface-treated metal oxide particles are hydrophobic, cause no primary aggregation, have a tap density of 75 g/L to 650 g/L, and contain substantially no free alkali metal cations. The first hydrophobicity-imparting agent is an alkoxysilane compound selected from the group consisting of a monoalkoxysilane compound, a dialkoxysilane compound and a trialkoxysilane compound. The surface-treated metal oxide particles are directly dried from the basic aqueous dispersion and are prepared in the form of a dry powder. |
