Process for making tailored polyetheylene resins for sheets
US9492963B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 9, 2007 |
| Grant date | Nov 15, 2016 |
| Priority date | — |
| Expiry date | May 19, 2031 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2323/08
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
This invention relates to coupling of polyethylene resins, more specifically coupling of polyethylene resins for use in extruded profiles, especially extruded profiles for sheet extrusion and cut sheet thermoforming applications and geomembranes. The process involves conveying a HDPE resin through an extruder, wherein the extruder comprises a feed zone, a first melt zone downstream of the feed zone, a second melt zone downstream of the first melt zone, and a third melt zone downstream of the second melt zone. The resin is melted in the first zone, contacted with oxygen in the second melt zone, and contacted antioxidant in the third melt zone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.