Multistage process for producing polyethylene compositions
US10000592B2 · kind B2 · utility
1Cited by
14References
29Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 12, 2014 |
| Grant date | Jun 19, 2018 |
| Priority date | — |
| Expiry date | Dec 12, 2034 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2205/03
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention is a process for producing copolymers of ethylene and alpha-olefins having from 4 to 10 carbon atoms in three polymerization stages where a low molecular weight copolymer of ethylene is produced in two of the stages and a high molecular weight copolymer in one of the stages. The resulting copolymers have a low content of extractable material and can be extruded to films which can be used in food contact applications.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.