To provide an energy conversion film having a high ability to convert energy, wherein a porous resin film having a high expansion ratio is obtained by forming a thermoplastic resin stretched film having a specific structure even without employing an expansion treatment with high-pressure gas so that a larger amount of electric charge can be held due to pores in the inside of the film.
The energy conversion film (i) comprises a core layer (A) composed of a thermoplastic resin stretched film containing a thermoplastic resin of 70-98 wt.% and an organic filler of 30-2 wt.%, and is characterized in that the core layer (A) contains pores having a height of 3-30 μm in the film thickness direction through the observation of the cross-section in the thickness direction and having a diameter in the film plane direction of 50-500 μm at a density of 100-3,000 pores/mm2.
| JPH01205745 | ELECTRET STORAGE DEVICE |
| JP4437232 | Electret |
| WO/2003/023796 | METHOD OF MAKING AN ELECTRET |
IIDA SEIICHIRO
KODAMA HIDEKAZU
YASUNO ISANAGA
FUKADA EIICHI
| JPS497798A | 1974-01-23 |
| WO2001022858A1 | 2001-04-05 | |||
| EP0182764A2 | 1986-05-28 |
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Yoshio Narui
Yoshiaki Matsui