发明名称 |
ELECTRET SHEET AND PIEZOELECTRIC SENSOR |
摘要 |
The present invention provides an electret sheet which can maintain a high generated voltage even if a large amount of pressure has been applied. Disclosed is an electret sheet of the present invention including an electrically charged propylene-based resin foam sheet which contains a crosslinked propylene-based resin that includes a propylene-±-olefin random copolymer having a weight average molecular weight of 370,000 to 420,000 at a proportion of 60% by weight or more, and has a gel fraction of 30% to 50% by weight, and in which the average thickness is 90 to 150 µm, and the average number of foam cells in the thickness direction is 2 to 4 cells. |
申请公布号 |
EP3118873(A1) |
申请公布日期 |
2017.01.18 |
申请号 |
EP20150760815 |
申请日期 |
2015.03.10 |
申请人 |
Sekisui Chemical Co., Ltd. |
发明人 |
KAMIYA, Nobuto;HATTA, Bungo;OKABAYASHI, Takazumi |
分类号 |
H01G7/02;C08J9/06 |
主分类号 |
H01G7/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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