PROCESS FOR PRODUCTION OF ELECTRET MATERIAL

WIPO Patent Application WO/2010/119869

A1

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.

JP4409106	Electret condenser Microphone exterior container
JP6554742	An electret element, a microphone equipped with the electret element, and a method for manufacturing the electret element.

TAKAOKA SEIICHI
YAMANA KUMIE

PCT/JP2010/056609

October 21, 2010

April 13, 2010

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NITTO DENKO CORP (JP)
TAKAOKA SEIICHI
YAMANA KUMIE

H04R19/01; H01G7/02

JP2006287279A	2006-10-19
JP2006063140A	2006-03-09
JP2000115895A	2000-04-21
JP2009267649A	2009-11-12
JPS6444010A	1989-02-16
JPH11150795A	1999-06-02
JP2000115895A	2000-04-21
JP2009097753A	2009-05-07

HASHIMOTO Kimihide et al. (JP)
Kimihide Hashimoto (JP)

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