Title:
ELECTRET SHEET AND PIEZOELECTRIC SENSOR
Document Type and Number:
WIPO Patent Application WO/2015/137351
Kind Code:
A1
Abstract:
The present invention provides an electret sheet which makes it possible to maintain a high generated voltage even if considerable pressure is applied. This electret sheet is characterized by comprising an electrostatically charged propylene-based resin foam sheet including a cross-linked propylene-based resin that contains 60 wt% or more of a propylene-α-olefin random copolymer having a weight-average molecular weight of 370,000 to 420,000 and that has a gel fraction of 30 to 50 wt%, the propylene-based resin foam sheet having a mean thickness of 90 to 150 μm and a mean number of bubbles in the thickness direction of two to four.
Inventors:
KAMIYA NOBUTO (JP)
HATTA BUNGO (JP)
OKABAYASHI TAKAZUMI (JP)
HATTA BUNGO (JP)
OKABAYASHI TAKAZUMI (JP)
Application Number:
PCT/JP2015/057042
Publication Date:
September 17, 2015
Filing Date:
March 10, 2015
Export Citation:
Assignee:
SEKISUI CHEMICAL CO LTD (JP)
International Classes:
H01G7/02; C08J9/06
Foreign References:
| JP2013258320A | 2013-12-26 | |||
| JP2004523667A | 2004-08-05 | |||
| JP2013214932A | 2013-10-17 | |||
| JP2014093313A | 2014-05-19 |
Other References:
See also references of EP 3118873A4
Attorney, Agent or Firm:
YAMAMOTO, TAKUYA (JP)
Takuya Yamamoto (JP)
Takuya Yamamoto (JP)
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