Oxygen tailoring of polyethylene
US9284415B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 12, 2012 |
| Grant date | Mar 15, 2016 |
| Priority date | — |
| Expiry date | Dec 12, 2032 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2323/06
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Processes are disclosed for oxygen-tailoring polyethylene, particularly polyethylenes suitable for wire and cable applications. One process includes conveying a first polyethylene having a melt index ≦5.0 and an MWD ≦5.0 through mixing or extrusion apparatus having a feed zone, a melt-mixing zone downstream of the feed zone, and a melt zone downstream of the melt-mixing zone, wherein the temperature of the first polyethylene in the melt zone ranges from about 180° C. to about 300° C.; and contacting the first polyethylene with an amount of an oxygen-containing gas having at least about 20.0 parts by weight oxygen per million per parts by weight of the first polyethylene (ppm (wt) O2). Polyethylene compositions having improved properties, particularly for wire and cable applications are disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.