Patent ID: 6787238
Filing Date: 2004-09-07
Classification: C08F,H01L,Y10S,Y10T

Abstract:
A polymer prepared by a polymerizing a mixture of three different monomers comprising:(a) at least one monomer of vinylidene-fluoride; (b) at least one monomer selected from the group consisting of trifluoroethylene and tetrafluoroethylene; and (c) at least one monomer selected from the group consisting of tetrafluoroethylene; vinyl fluoride; perfluoro (methyl vinyl ether); bromotrifluoroethylene; chlorofluoroethylene; chlorotrifluoroethylene; and hexafluoropropylene; wherein when said polymer is stretched to greater than its original length and thereafter annealed at a temperature below its melting point, it exhibits (1) an electrostrictive strain, at room temperature, of 3% or more when an electric field gradient of 100 megavolts per meter or greater is applied thereacross optionally; (2) a dielectric constant, at room temperature, of 40 or higher at 1 kHz; and (3) an elastic energy density, at room temperature, of 0.3 joules/cm3 or higher.