Patent ID: 11905349

Abstract:
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 —CF2H group, a —CF2CH2COF group, a —COF group, a —COOH group, a dimer of a —CF2COOH group and a monomer of a CF2CH2COOH group, a —COOCH3 group, a —CONH2 group, and a —CH2OH group satisfy the following formula (2): PIA/(PIB+PIC+PID+PIE+PIF+PIG+PIH)≥0.60  (2) wherein the loss tangents (tan δ) and peak intensities (PI) are as defined herein.