Controlled comonomer distribution along a reactor for copolymer production
US7053163B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 22, 2005 |
| Grant date | May 30, 2006 |
| Priority date | — |
| Expiry date | Feb 22, 2025 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/901
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The tendency of copolymer fluff grains of propylene and ethylene to agglomerate is reduced by injecting at least one olefin comonomer, such as ethylene monomer, into more than one point along the length of the reactor, rather than injecting all of the ethylene at one point. This process reduces the tendency of copolymer fluff grains to agglomerate and cause processing problems as compared with injecting the comonomer at only one point. Copolymer made by this process is expected to have lower substantially amorphous polypropylene content and better organoleptics than copolymer made where the ethylene is injected at only one point. In one non-limiting embodiment the copolymerization reactor is a loop-type reactor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.