Kureha Corporation

Aya Shike

Yoshiyuki Nagasawa

Yasuhiro Suzuki

The vinylidene-fluoride-based polymer composition according to the present invention comprises a vinylidene-fluoride-based polymer and a specific surfactant and contains no fluorinated surfactant, wherein the specific surfactant is contained in an amount of 10 ppm or larger but less than 100 ppm in terms of mass ppm of the solid components of the composition and has an HLB value of 10 or greater. The method for producing a vinylidene-fluoride-based polymer according to the present invention comprises emulsion-polymerizing specific monomers in an aqueous medium in the presence of a specific emulsifier and an initiator without using any fluorinated surfactant, the use amount of the emulsifier being 8.5 ppm or larger but less than 100 ppm in terms of mass ppm of the monomers.

Vinylidene fluoride-based polymer composition obtained using non-fluorinated surfactant and production method therefor

A resin composition for a non-aqueous electrolyte secondary battery that includes a vinylidene fluoride copolymer having a constituent unit derived from vinylidene fluoride and a constituent unit derived from a fluorine-containing alkyl vinyl compound. A melting point, measured in accordance with ASTM D3418, of the vinylidene fluoride copolymer is from 105&#xb0; C. to 125&#xb0; C., and a mass fraction Wof the constituent unit derived from the fluorine-containing alkyl vinyl compound in the vinylidene fluoride copolymer, a degree of crystallinity Dof the vinylidene fluoride copolymer, and a degree of amorphicity Dof the vinylidene fluoride copolymer satisfy Equation (1) below:4.7&#x2264;&#xd7;()&#x2264;14&#x2003;&#x2003;(1).

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

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Tokyo, Japan

Aya Shike