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Patent Searching and Data


Title:
ELECTRET SHEET
Document Type and Number:
WIPO Patent Application WO/2017/135458
Kind Code:
A1
Abstract:
The present invention provides an electret sheet that maintains high piezoelectricity even in a high-temperature environment. Since this electret sheet is characterized by including a charged porous sheet, wherein the volume resistivity at 25 °C is 1.0×1015 Ω·cm or more and the dielectric breakdown voltage at 25 °C is 7 kV or more, and preferably, the volume resistivity at 37 °C is 1.0×1014 Ω·cm or more and the dielectric breakdown voltage at 37 °C is 7 kV or more, the electret sheet maintains excellent piezoelectricity even after being left in a high-temperature atmosphere for a long period of time.

Inventors:
KATO Tetsuhiro (2-1, Hyakuyama, Shimamoto-cho, Mishima-gu, Osaka 21, 〒6180021, JP)
KAMIYA Nobuto (2-1, Hyakuyama, Shimamoto-cho, Mishima-gu, Osaka 21, 〒6180021, JP)
TSUCHIYA Masahiro (2-1, Hyakuyama, Shimamoto-cho, Mishima-gu, Osaka 21, 〒6180021, JP)
KATSURAYAMA Yuuta (2-1, Hyakuyama, Shimamoto-cho, Mishima-gu, Osaka 21, 〒6180021, JP)
SHIRASAKA Yasuyuki (2-1, Hyakuyama, Shimamoto-cho, Mishima-gu, Osaka 21, 〒6180021, JP)
Application Number:
JP2017/004124
Publication Date:
August 10, 2017
Filing Date:
February 03, 2017
Export Citation:
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Assignee:
SEKISUI CHEMICAL CO.,LTD. (4-4 Nishitemma 2-chome, Kita-ku Osaka-sh, Osaka 65, 〒5308565, JP)
International Classes:
H01G7/02
Foreign References:
JP2014034592A2014-02-24
JP2014143369A2014-08-07
JPH08284063A1996-10-29
Other References:
See also references of EP 3413325A4
Attorney, Agent or Firm:
YAMAMOTO Takuya (Tokuyama Bldg.201, 21-22 Showa-cho 1-chome, Abeno-ku, Osaka-sh, Osaka 11, 〒5450011, JP)
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