Patent ID: 6355749
Filing Date: 2002-03-12
Classification: C08F

Abstract:
A melt and solution processible, substantially homogeneous, semicrystalline ferroelectric terpolymer comprising from 50-80 mole % vinylidene fluoride, from 15-40 mole % trifluoroethylene, and from 2-20 mole % of at least one bulky, free-radical polymerizable monomer, wherein said terpolymer has been prepared by a combination of bulk polymerization and free radical polymerization at a temperature of from about âˆ’10 to about 40Â° C., and wherein said terpolymer exhibits (i) substantially uniform nano-crystalline domains, (ii) a molecular weight in excess of about 10,000 grams/mole, (iii) a Curie transition temperature of from about 15 to about 40Â° C., (iv) a dielectric constant of at least about 40 and up to about 100 at 1 kHz, 25Â° C., and (v) an electrostrictive response of at least 0.5% at 50 MV/m and at least 2.5% at 100 MV/m at ambient temperature.