The preparation and characterization of TiO₂ particles coated with an electrophoretic polymer using silane coupling agents and highly hydrophilic monomers (methyl methacrylate) are presented in this article. The organic layer was formed by radical polymerization and bonded to the surface of inorganic TiO₂ with a silane coupling agent. The polymer-coated particles were characterized by Fourier transform infrared spectrometry, field emission scanning electron microscopy, and thermogravimetric analysis. The size distribution and charge properties of the polymer-coated particles were measured, and the optical response of electrophoretic image display cells, containing the particles, was also investigated. It was found that coating materials having a branched alkyl side chain structure endowed the final polymer-coated particles with good stability and favorable electrophoretic properties in an electrophoretic medium. In addition, the charge polarity of the polymer-coated particles could be controlled using different silanizing reagents and polymers. Furthermore, electrophoretic image display cells, containing such particles, demonstrated good response and high reflectance in their white state.