Resin composition for nonaqueous electrolyte secondary battery, separator for nonaqueous electrolyte secondary battery using same, resin composition for electrode mixture layer, electrode for nonaqueous electrolyte secondary battery, and nonaqueous electrolyte secondary battery

A resin composition for a non-aqueous electrolyte secondary battery comprising:

• a vinylidene fluoride copolymer having a constituent unit derived from vinylidene fluoride and a constituent unit derived from a fluorine-containing alkyl vinyl compound, wherein
• a melting point, measured in accordance with ASTM D3418, of the vinylidene fluoride copolymer is from 105° C. to 125° C.,
• a mass fraction Wa of the constituent unit derived from the fluorine-containing alkyl vinyl compound in the vinylidene fluoride copolymer is 18 mass % or greater and 30 mass % or less, and
• the mass fraction Wa of the constituent unit derived from the fluorine-containing alkyl vinyl compound in the vinylidene fluoride copolymer, a degree of crystallinity DC of the vinylidene fluoride copolymer, and a degree of amorphicity DA of the vinylidene fluoride copolymer satisfy Equation (1):
• 4.7≤Wa×(DC/DA)≤14 (1).