Ethylene/tetrafluoroethylene copolymer
US11905349B2 · kind B2 · utility
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5References
17Claims
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Key dates
| Filing date | Oct 31, 2022 |
| Grant date | Feb 20, 2024 |
| Priority date | — |
| Expiry date | Oct 31, 2042 |
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): 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.