Ethylene/tetrafluoroethylene copolymer
US11548960B2 · kind B2 · utility
1Cited by
4References
14Claims
0Family size
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Key dates
| Filing date | Nov 8, 2018 |
| Grant date | Jan 10, 2023 |
| Priority date | — |
| Expiry date | Apr 23, 2039 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2203/202
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
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)PIA/(PIB+PIC+PID+PIE+PIF+PIG+PIH)≥0.60 (2)
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.