Nonfibrous, piezoelectric polymer sheet of improved activity...

Details Nonfibrous, piezoelectric polymer sheet of improved activity... Nonfibrous, piezoelectric polymer sheet of improved activity...

B - Operations, Transporting

29

C

18/60, 349/65

B29C 71/04 (2006.01) H01L 41/193 (2006.01) H01L 41/26 (2006.01)

Patent

CA 1243458

Abstract of the Disclosure A nonfibrous, unoriented sheet of a copolymer resin of about 65 to 85 mol percent of vinylidene fluoride and from 15 to about 35 mol percent of at least one other copolymerizable substituted monoolefinic monomer, said sheet having improved and uniform piezoelectric properties for hydrophonic use, and the process for preparing said sheet with improved piezoelectric and dielectric breakdown strength properties wherein it is heated for at least about 20 minutes within the temperature range of above the crystalline melting temperature and below a defined temper- ature, cooled to below the Curie temperature and then electrically poled, are disclosed herein.

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