Title:
PROCESS FOR PRODUCTION OF ELECTRET MATERIAL
Document Type and Number:
WIPO Patent Application WO/2010/119869
Kind Code:
A1
Abstract:
Disclosed is a production process which can produce an electret material having an excellent charge-retentive property under heated conditions. Specifically disclosed is a process for producing an electret material, which comprises an irradiation step, a formation step and an electrical charging step. In the irradiation step, a dispersion containing polytetrafluoroethylene microparticles is irradiated with γ-ray. In the formation step, the dispersion that has been irradiated with γ-ray is applied on an electrode plate, the applied dispersion is dried, and the polytetrafluoroethylene microparticles are burned, thereby forming a polytetrafluoroethylene layer on the electrode plate. In the electrical charging step, the surface of the polytetrafluoroethylene layer is subjected to a electrical charging treatment.
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Inventors:
TAKAOKA Seiichi (())
▲高▼岡 誠一 (())
▲高▼岡 誠一 (())
Application Number:
JP2010/056609
Publication Date:
October 21, 2010
Filing Date:
April 13, 2010
Export Citation:
Assignee:
NITTO DENKO CORPORATION (1-2 Shimohozumi 1-chome, Ibaraki-shi Osaka, 80, 〒5678680, JP)
日東電工株式会社 (〒80 大阪府茨木市下穂積１丁目１番２号 Osaka, 〒5678680, JP)
TAKAOKA Seiichi (())
日東電工株式会社 (〒80 大阪府茨木市下穂積１丁目１番２号 Osaka, 〒5678680, JP)
TAKAOKA Seiichi (())
International Classes:
H01G7/02; H04R19/01
Attorney, Agent or Firm:
HASHIMOTO Kimihide et al. (Eikoh Patent Firm, Toranomon East Bldg. 10F 7-13, Nishi-Shimbashi 1-chome, Minato-k, Tokyo 03, 〒1050003, JP)
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