Daikin Industries, Ltd.

Yuuko Takano

Takahiro Kitahara

Takashi Sekiguchi

Tatsuya Funaoka

Kazunobu Uchida

Ryouichi Yano

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)

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Osaka, Japan

Yuuko Takano