Abstract
Positively or negatively charged electrophoretic white particles were prepared via two step chemical reactions : 1) modification of TiO2 particles with silane coupling agents having polymerizable moiety or quaternary ammonium moiety, and 2) graft polymerization of hydrophilic monomer in the presence of modified TiO2 particles. Characteristics of electrophoretic image display containing these particles were highly influenced by addition of non-ionic surfactants. Some surfactants in sorbitan derivatives with large HLB number were very effective to improve display characteristics, and increase electrical conductivity of Isopar G solutions. These non-ionic surfactants might promote dissociation of ion pairs, and therefore accelerate electrophoretic mobility of TiO2 particles dispersed in Isopar G.
