	US 11,963,454 B2
	Piezoelectric body film, piezoelectric body film production method, and piezoelectric body device
Yusuke Sato, Tokyo (JP); Hisaaki Terashima, Tokyo (JP); Nobufumi Sato, Tokyo (JP); Kazuyuki Kanno, Tokyo (JP); and Keiko Aita, Tokyo (JP)
Assigned to KUREHA CORPORATION, Tokyo (JP)
Appl. No. 16/969,605
Filed by Kureha Corporation, Tokyo (JP)
PCT Filed Oct. 19, 2018, PCT No. PCT/JP2018/039056 § 371(c)(1), (2) Date Aug. 13, 2020, PCT Pub. No. WO2019/171650, PCT Pub. Date Sep. 12, 2019.
Claims priority of application No. 2018-038532 (JP), filed on Mar. 5, 2018.
Prior Publication US 2021/0367137 A1, Nov. 25, 2021
Int. Cl. H10N 30/098 (2023.01); B29C 71/02 (2006.01); C08J 5/18 (2006.01); H10N 30/857 (2023.01)

CPC H10N 30/857 (2023.02) [C08J 5/18 (2013.01); C08J 7/08 (2013.01); H10N 30/098 (2023.02); C08J 2327/16 (2013.01)]

6 Claims

1. A piezoelectric body film comprising a fluororesin as a piezoelectric material, the fluororesin containing, as a main constituent unit, a repeating unit derived from vinylidene fluoride, wherein

a piezoelectric constant d31 of the piezoelectric body film is 20 pC/N or greater,

an extrapolated onset temperature at start of shrinkage determined by TMA measurement is not lower than 90° C. and not higher than 135° C., and

the extrapolated onset temperature is a temperature at which the piezoelectric body film exhibits thermal shrinkage phenomenon.