Olefin polymerization process
US6127484A · kind A · utility
49Cited by
15References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 29, 1999 |
| Grant date | Oct 3, 2000 |
| Priority date | — |
| Expiry date | Apr 29, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2314/06
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A multiple stage or multiple zone process for making olefin polymers is disclosed. A single-site catalyst, preferably one that contains a heteroatomic ligand, is used in the first stage or zone, and a Ziegler-Natta catalyst is used at a higher temperature in later stages or zones. A parallel multiple zone process is also described. The processes, which can be performed adiabatically, give polymers with improved thermal processing ability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.