Ethylene polymer composition
US8653201B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 31, 2006 |
| Grant date | Feb 18, 2014 |
| Priority date | — |
| Expiry date | Aug 31, 2026 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2205/025
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A composition suitable for use in pressure pipes and pipe fittings is disclosed comprising polymer of ethylene and from 0.5 to 5 wt % of a C4-C8 alpha-olefin which has a natural density of 935-956 kg/m3, a melt index MI5 of 0.15-0.5 g/10 min, a dynamic complex viscosity at 100 rad/s and 190° C. (η100) of no more than 2500 Pa·s, a relationship between η100 and dynamic complex viscosity measured in Pa·s at 0.01 rad/s and 190° C. (η0.01) defined by the equation η0.01>115000+30. η100, and an environmental stress crack resistance as measured by a notched pipe test performed according to ISO13479:1997 on 110 mm SDR 11 pipes at 80° C. and a pressure of 9.2 bar, of greater than 1000 hours, or: wherein the C4-C8 alpha-olefin is 1-hexene or 1-octene.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.