VINYLIDENE FLUORIDE COPOLYMER COMPOSITION AND METHOD FOR PRODUCING SAME, POLYMER DISPERSION SOLUTION, ELECTRODE FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY, ELECTROLYTE LAYER FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY, AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

The present invention addresses the problem of providing a vinylidene fluoride copolymer composition that exhibits stable dispersibility in a dispersion medium over an extended period of time. This vinylidene fluoride copolymer composition that solves said problem contains a vinylidene fluoride copolymer. The melting point of the vinylidene fluoride copolymer composition is 140°C or less. The reversing heat flow of the vinylidene fluoride copolymer composition shows endothermic peaks in which the enthalpy of fusion is 2 J/g or more, and the absolute value of the difference between the temperature indicating the largest endothermic peak among the endothermic peaks and the melting point of the vinylidene fluoride copolymer composition is 10°C or less. When a dispersion solution (percentage content of vinylidene fluoride is 10 mass%) containing butyl butyrate and said vinylidene fluoride copolymer composition is left still for 20 hours, the percentage content of the vinylidene fluoride copolymer composition in 20 vol% at the top of the dispersion solution after being left still is 4.0-10 mass%.