Propylene preliminary polymerization
US12319756B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 27, 2022 |
| Grant date | Jun 3, 2025 |
| Priority date | — |
| Expiry date | Jun 27, 2042 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F4/655
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for propylene preliminary polymerization in liquid phase that occurs in a continuous preliminary polymerization reactor may include feeding a propylene monomer and a Ziegler-Natta catalyst system having (a) a pro-catalyst having an internal electron donor comprising a substituted phenylene aromatic diester, (b) a catalyst activator and optionally (c) an external donor, into the continuous preliminary polymerization reactor, wherein the feeding is carried out without pre-contact of the pro-catalyst with the catalyst activator, and also without pre-contact of the catalyst activator with the propylene monomer before entering the continuous preliminary polymerization reactor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.