发明名称 |
Process for production of electret material |
摘要 |
Provided is a process by which an electret material having excellent thermal resistance of charge retentivity can be obtained. The process for producing an electret material of the invention includes an irradiation step, a formation step, and a charging step. In the irradiation step, a dispersion containing fine polytetrafluoroethylene particles is irradiated with γ rays. In the formation step, the dispersion which has been irradiated with γ rays is applied to an electrode plate and then dried, and the fine polytetrafluoroethylene particles are sintered to form a polytetrafluoroethylene layer on the electrode plate. In the charging step, the surface of the polytetrafluoroethylene layer is subjected to a charging treatment. |
申请公布号 |
US8747961(B2) |
申请公布日期 |
2014.06.10 |
申请号 |
US201013131723 |
申请日期 |
2010.04.13 |
申请人 |
Nitto Denko Corporation |
发明人 |
Takaoka Seiichi;Yamana Kumie |
分类号 |
B05D3/00;H05H1/24;H05B6/00;H05H1/00 |
主分类号 |
B05D3/00 |
代理机构 |
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代理人 |
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主权项 |
1. A process for producing an electret material for use in electrostatic acoustic transducers, the process comprising:
a step of irradiating a dispersion containing fine polytetrafluoroethylene particles with γ ray; a step of applying the irradiated dispersion to an electrode plate, followed by drying, and further sintering the fine polytetrafluoroethylene particles, thereby forming a polytetrafluoroethylene layer on the electrode plate; and a step of subjecting a surface of the polytetrafluoroethylene layer to a charging treatment, wherein an exposure dose of the γ ray is from 100 Gy to 3,000 Gy.
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地址 |
Osaka JP |