FIELD: chemistry.
SUBSTANCE: invention relates to a method of producing electret fine particles or coarse powder. The method of producing electret fine particles includes steps of emulsifying a fluorine-containing material which contains a vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer in a liquid which is immiscible with the fluorine-containing material to obtain emulsified particles or microcapsule particles and subjecting the emulsified particles or microcapsule particle to irradiation with an electron beam, radioactive radiation, or corona discharge treatment. A version of a method of producing a coarse powder is also disclosed.
EFFECT: excellent electrophoretic properties.
8 cl, 4 tbl, 5 dwg, 24 ex
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