Patent ID: 8257679

Claim:
A process for producing organically modified metal oxide nanoparticles, which comprises: reacting an organic modifying agent with the surface of a metal oxide nanoparticle in a reaction field of high-temperature, high-pressure water to form organically modified metal oxide nanoparticles wherein an optionally substituted or unsubstituted hydrocarbon group is bonded to the surface of said nanoparticle through a linkage selected from the group consisting of a covalent bond, an ether bond, an ester bond, a bond through an N atom, a bond through an S atom, a metal-C— bond, a metal-C═ bond, and a metal-(C═O)— bond, and the reaction field contains a coexistent material and the coexistent material used is a solvent for promoting the phase-homogenization of the organic modifying agent and water.