Process for producing electret coarse powder
View Patent ↗The subject invention provides a process for efficiently producing electret coarse powder useful as electrophoretic particles for a large-screen display. The process for producing electret coarse powder comprises irradiating a fluorine-containing resin sheet with an electron beam or a radial ray to convert the fluorine-containing resin sheet into an electret sheet, and pulverizing the electret sheet.
1. A process for producing electret coarse powder, comprising irradiating a fluorine-containing resin sheet with an electron beam or a radial ray to convert the fluorine-containing resin sheet into an electret sheet, and pulverizing the electret sheet.
2. The process according to claim 1 , wherein the electret coarse powder has a mean particle diameter of from 0.5 to 3 mm.
3. The process according to claim 2 , wherein the electret coarse powder contains a pigment.
4. The process according to claim 1 , wherein the electret coarse powder contains a pigment.
5. The process according to claim 1 , wherein the fluorine-containing resin sheet is at least one member selected from the group consisting of tetrafluoroethylene-hexafluoropropylene copolymer sheets (FEP), tetrafluoroethylene-perfluoroalkylvinylether copolymer sheets (PFA) and polytetrafluoroethylene sheets (PTFE).
6. The process according to claim 5 , wherein the electret coarse powder has a mean particle diameter of from 0.5 to 3 mm.
7. The process according to claim 6 , wherein the electret coarse powder contains a pigment.
8. The process according to claim 5 , wherein the electret coarse powder contains a pigment.