Patent ID: 7452387

Claim:
A process for producing a polymer electrolyte for a nonaqueous battery, comprising: introducing 80 to 97 wt. % of vinylidene fluoride monomer and 3 to 20 wt % of at least one monomer copolymerizable with vinylidene fluoride monomer into a polymerization vessel, all of said vinylidene fluoride monomer and at least one monomer being introduced simultaneously into the polymerization vessel before commencing polymerization, then suspension-polymerizing the monomers to provide a vinylidene fluoride copolymer comprising polymerized units of the monomers and having an inherent viscosity of 1.5 to 10 dl/g, and impregnating the vinylidene fluoride copolymer with a nonaqueous electrolytic solution to provide a polymer electrolyte.