Methods for operating a polymerization reactor
US11117991B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 5, 2019 |
| Grant date | Sep 14, 2021 |
| Priority date | — |
| Expiry date | Jan 2, 2040 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F2410/01
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Methods for olefin polymerization are described. The methods include a) forming a first polyolefin under a first set of polymerization conditions in the presence of a first catalyst composition and a first concentration of at least a first continuity additive composition, the first polyolefin composition having a target density, ρ1, and a target Flow Index, FI1; and b) forming a second polyolefin composition under a second set of polymerization conditions in the presence of a second catalyst composition and a second concentration of a second continuity additive composition, the second polyolefin composition having a target density, ρ2, and a target Flow Index, FI2; wherein the process is essentially free of providing a polymerization neutralizing composition between steps a) and b).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.