Insulating composition for an electric power cable
US6369129B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 30, 2000 |
| Grant date | Apr 9, 2002 |
| Priority date | — |
| Expiry date | Jun 30, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L23/0815
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An insulating composition for an electric power cable, and an electric power cable comprising a conductor surrounded by an inner semiconducting layer, an insulating layer, and an outer semiconducting layer, where the insulating layer consists of said insulating composition, are disclosed. The insulating composition comprises a crosslinkable multimodal ethylene copolymer obtained by coordinating catalysed polymerization of ethylene and at least one alpha-olefin, and has a density of 0.890-0.940 g/cm3 and an MFR2 of 0.1-10 g/10 min. The insulating composition is characterized in that the ethylene copolymer has an MWD of 3-12, a melting temperature of at most 125° C., and a viscosity of 2500-7000 Pa.s at 135° C. and a shear rate of 10 s−1, 1000-1800 Pa.s at 135° C. and a shear rate of 100 s−1, and 250-400 Pa.s at 135° C. and a shear rate of 1000 s−1, and that the multimodal ethylene copolymer includes an ethylene copolymer fraction selected from (a) a low molecular weight ethylene copolymer having a density of 0.900-0.950 g/cm3 and an MFR2 of 25-300 g/10 min and (b) a high molecular weight ethylene copolymer having a density of 0.870-0.940 g/cm3 and a…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.