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

A vinylidene fluoride copolymer composition comprising a vinylidene fluoride copolymer, the vinylidene fluoride copolymer comprising a structural unit derived from vinylidene fluoride and a structural unit derived from a fluorinated alkyl vinyl compound, wherein

• the vinylidene fluoride copolymer composition has a melting point of 140° C. or lower;
• an average primary particle diameter of particles of the vinylidene fluoride copolymer composition determined by a dynamic light scattering method is 5 μm or less;
• when a reversing heat flow of the vinylidene fluoride copolymer composition is measured with a temperature-modulated differential scanning calorimetry, the vinylidene fluoride copolymer composition has endothermic peaks having an amount of enthalpy of fusion (ΔHm) of 2 J/g or more with two or more peak tops;
• an absolute value of a difference between a peak top temperature of a largest endothermic peak among the endothermic peaks and the melting point of the vinylidene fluoride copolymer composition is 10° C. or lower;
• and
• after a dispersion comprising butyl butyrate and the vinylidene fluoride copolymer composition and having a content rate of the vinylidene fluoride copolymer composition of 10 mass % is stirred at 25° C. for 30 minutes and left to stand for 20 hours, a content rate of the vinylidene fluoride copolymer composition in an upper 20 vol % of the dispersion is 7.0 mass % or more and 10 mass % or less.