| 摘要 |
<p>The present invention provides processes for manufacturing electret fine particles or coarse powder which can be uniformly electrified and thus exhibits excellent electrophoretic properties. Specifically, the present invention pertains to (1) a process for manufacturing electret fine particles which comprises emulsifying a fluorine-containing material that contains a vinylidene fluoride/hexafluoropropylene/tetra- fluoroethylene terpolymer in a liquid incompatible with the fluorine-containing material to form emulsified particles, and subjecting the emulsified particles to electron beam irradiation, radiation irradiation, or corona discharge treatment, and (2) a process for manufacturing an electret coarse powder which comprises subjecting a resin sheet that contains a vinylidene fluoride/hexafluoropropylene/tetrafluoroethylene terpolymer to electron beam irradiation, radiation irradiation or corona discharge treatment to convert the sheet into an electret sheet, and then pulverizing the electret sheet.</p> |
