Wenderoth, Lind & Ponack
Polymer piezoelectric film
 A polymer piezoelectric film comprising a poled film of a vinylidene fluoride copolymer having a high molecular weight as defined by an inherent viscosity within a specific range comprising 40 to 90 mol. % of vinylidene fluoride and 10 to 60 mol. % of trifluoroethylene. Such a high molecular weight vinylidene fluoride copolymer can give a preferable state of molecular arrangement during film formation, particularly preferably formation by casting, to provide a film excellent in piezoelectric characteristic and secondary processing characteristic. 
Kureha Kagaku Kogyo Kabushiki Kaisha
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Kenichi Naohiro Teruo
Nakamura Murayama Sakagami