Patent ID: 9513526
Filing Date: 2016-12-06
CPC Classification: G02F,H01G

Claim Text:
1. A core-shell electret fine particle comprising a core part and a shell part, the core part containing a material that has an ability to disperse a pigment therein, the shell part consisting essentially of an electret resin, the electret resin being a fluorine-containing resin selected from the group consisting of polytetrafluoroethylene, polychlorotrifluoroethylene, polyvinylidene fluoride, polyvinyl fluoride, perfluoropolyether, tetrafluoroethylene-perfluoroalkoxyvinylether copolymer, tetrafluoroethylene-hexafluoropropylene copolymer, tetrafluoroethylene-ethylene copolymer, chlorotrifluoroethylene-ethylene copolymer, vinylidene fluoride-tetrafluoroethylene copolymer, vinylidenefluoride-hexafluoropropylene-tetrafluoroethylene terpolymer, and a combination thereof, and the electret resin being electretized by electron ray irradiation, radial ray irradiation, or corona discharge treatment.