Process for gas-phase polymerization having high bed bulk density
US10647790B2 · kind B2 · utility
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18Claims
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Key dates
| Filing date | Jun 30, 2011 |
| Grant date | May 12, 2020 |
| Priority date | — |
| Expiry date | Dec 6, 2034 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F210/06
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention relates to an improvement for gas-phase olefin polymerization process having relatively high bed bulk density. The improvement involves the use of mixed external electron donors when polymerizing propylene in a gas-phase reactor having a polymer bed with a bulk density greater than 128 kg/m3, optionally with one or more comonomers, wherein the mixed electron donor system comprises at least a first external electron donor and a second external electron donor, and wherein the first external electron donor is a carboxylate compound.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.