Patent ID: 11905349
Assignee: DAIKIN INDUSTRIES, LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC C  H | IPC C  H

Claim 0:
1. An ethylene/tetrafluoroethylene copolymer satisfying the following formula (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),

75≤ tan δ(60)/tan δ(5)×100≤225  (1), wherein
tan δ(5): a loss tangent after five minutes from start of measurement in dynamic mechanical analysis in an air atmosphere at 320° C.; and
tan δ(60): a loss tangent after 60 minutes from the start of measurement in the dynamic mechanical analysis in the air atmosphere at 320° C.,

PIA/(PIB+PIC+PID+PIE+PIF+PIG+PIH)≥0.60  (2), wherein
PIA: the peak intensity of vibration derived from the —CF2H group;
PIB: the peak intensity of vibration derived from the CF2CH2COF group;
PIC: the peak intensity of vibration derived from the —COF group;
PID: the peak intensity of vibration derived from the —COOH group;
PIE: the peak intensity of vibration derived from the dimer of the —CF2COOH group and the monomer of the CF2CH2COOH group;
PIF: the peak intensity of vibration derived from the —COOCH3 group;
PIG: the peak intensity of vibration derived from the —CONH2 group; and
PIH: the peak intensity of vibration derived from the —CH2OH group.