Cable and method for using a cable-sheathing composition including an ethylene polymer mixture
US6329054A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 15, 1998 |
| Grant date | Dec 11, 2001 |
| Priority date | — |
| Expiry date | May 15, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2947
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A cable-sheating composition and its use as outer sheath for a power cable or a communication cable are disclosed. The cable-sheating composition is a multimodal, preferably bimodal, mixture of olefin polymers, preferable ethylene plastics, having a density of about 0.915-0.955 g/cm.sup.3 and a melt flow rate of about 0.1-0.3 g/10 min, said olefin polymer mixture comprising at least a first and a second olefin polymer, of which the first has a density and a melt flow rate selected from (a) about 0.930-0.975 g/cm.sup.3 and about 50-2000 g/10 min and (b) about 0.88-0.93 g/cm.sup.3 and about 0.1-0.8 g/10 min. Preferably, the olefin polymer mixture has been obtained by coordination-catalyzed polymerization of at least one .alpha.-olefin in several stages, preferably two stages consisting of a loop reactor/a gas-phase reactor or a gas-phase reactor/a gas-phase reactor, through polymerization or copolymerization of ethylene in the first stage and copolymerization of ethylene with butene, 4-methyl-1-pentene, 1-hexene or 1-octene in the second stage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.