Daikin Industries, Ltd.

Ryouichi Yano

Tatsuya Funaoka

Takahiro Kitahara

Takashi Sekiguchi

Kazunobu Uchida

Yuuko Takano

Manabu Fujisawa

Kazuya Asano

Masahiro Tomita

Takashi Iguchi

Yuki Yotsumoto

Kanako Arai

Provided is a composition including a polyvinylidene fluoride (A); and a vinylidene fluoride polymer (B) excluding the polyvinylidene fluoride (A), wherein the polyvinylidene fluoride (A) comprises vinylidene fluoride unit and a pentenoic acid unit represented by formula (1): CH═CH—(CH)—COOY wherein Y represents at least one selected from the group consisting of an inorganic cation and an organic cation, a content of vinylidene fluoride unit of the polyvinylidene fluoride (A) is 95.0 to 99.99 mol % based on all monomer units of the polyvinylidene fluoride (A), and a content of the pentenoic acid unit of the polyvinylidene fluoride (A) is 0.01 to 5.0 mol % based on all monomer units of the polyvinylidene fluoride (A).

Composition, binder, electrode mixture, electrode, and secondary battery

Provided is a copolymer consisting essentially of ethylene units, tetrafluoroethylene units, and hexafluoropropylene units, wherein a molar ratio (Et units/TFE units) of the ethylene (Et) units to the tetrafluoroethylene (TFE) units is 52.0/48.0 to 56.0/44.0, and a content of the hexafluoropropylene units is 19.0 to 21.0 mol % based on the total monomer units constituting the copolymer.

Copolymer

An ethylene/tetrafluoroethylene copolymer satisfying the following formula (1):75≤ tan δ(60)/tan δ(5)×100≤225  (1)wherein peak intensities, determined by Fourier transform infrared spectroscopy, of vibrations derived from a —CFH group, a —CFCHCOF group, a —COF group, a —COOH group, a dimer of a —CFCOOH group and a monomer of a CFCHCOOH group, a —COOCHgroup, a —CONHgroup, and a —CHOH group satisfy the following formula (2):PI/(PI+PI+PI+PI+PI+PI+PI)≥0.60  (2)wherein the loss tangents (tan δ) and peak intensities (PI) are as defined herein.

Ethylene/tetrafluoroethylene copolymer

An ethylene/tetrafluoroethylene copolymer satisfying the following formula (1), wherein peak intensities, determined by Fourier transform infrared spectroscopy, of vibrations derived from a &#x2014;CFH group, a &#x2014;CFCHCOF group, a &#x2014;COF group, a &#x2014;COOH group, a dimer of a &#x2014;CFCOOH group and a monomer of a CFCHCOOH group, a &#x2014;COOCHgroup, a &#x2014;CONHgroup, and a &#x2014;CHOH group satisfy the following formula (2):75&#x2264;tan &#x3b4;(60)/tan &#x3b4;(5)&#xd7;100&#x2264;225&#x2003;&#x2003;(1)PI/(PI+PI+PI+PI+PI+PI+PI)&#x2265;0.60&#x2003;&#x2003;(2)

A polydifluoroacetylene containing a C&#x2550;C bond and a C&#x2014;F bond, the polydifluoroacetylene having a solubility of 0.2 g/10 g or less in dimethylformamide (DMF) at 25&#xb0; C. Also disclosed is a method for producing the polydifluoroacetylene, a precursor polymer for providing the polydifluoroacetylene, a molded article including the polydifluoroacetylene and a polydifluoroacetylene powder.

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Osaka, Japan

Ryouichi Yano