Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carbohydrate or derivative as a reactant
Patent
1983-12-30
1985-12-24
Seccuro, Carman J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carbohydrate or derivative as a reactant
264 22, 264 26, 2642884, 525 88, C08L 2716
Patent
active
045607370
ABSTRACT:
A piezoelectric polymeric material in the form of sheet or film, which comprises polymers of vinylidene fluoride (VDF) as principle components. The piezoelectric material is essentially a mixture of 100 parts by weight of a VDF base resin, which may be either poly(VDF) or a copolymer, and 1-100 parts by weight of a copolymer of a fluoroelastomer and either VDF monomer or a monomer mixture containing a major amount of VDF monomer. A sheet or film having a high piezoelectric modulus is obtained by stretching a sheet or film of said mixture at an adequately elevated temperature and polarizing the sheet or film after or during the stretching thereby making the stretching sheet or film an electret.
REFERENCES:
patent: 3769371 (1973-10-01), Nersasian
patent: 3794986 (1974-02-01), Murayama
patent: 3798287 (1974-03-01), Murayama et al.
patent: 4200568 (1980-04-01), Trautvetter
patent: 4393093 (1983-07-01), Sprout, Jr.
Abstract of European Pat. 18-802, (4-79), Kure.
Inoue Shuichi
Kawashima Chikashi
Nejigaki Kazumi
Yamamoto Kazuhiko
Yasumura Takashi
Central Glass Company Limited
Seccuro Carman J.
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