Sughrue, Rothwell, Mion, Zinn and Macpeak
Piezoelectric elements of organic high molecular weight materials
 Organic piezoelectric elements having a piezoelectric modulus of the order of as high as 10.sup.-6 c.g.s.e.s.u. or more are obtained from a film, sheet or other shaped structure of a high molecular weight copolymer of 99 to 50% by weight of vinylidene fluoride with, correspondingly, 1 to 50% by weight of a comonomer, by heating the shaped structure to a temperature of 40.degree. to 200.degree. C. in an electrostatic field of an electropotential gradient of 30 to 1,500 KV/cm. 
Kureha Kagaku Kogyo Kabushiki Kaisha
H B B B B Y B B H
H01G B29K B29K B29K B29C Y10S B29K B29C H01L
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Naohiro
Murayama