Catalyst composition with mixed selectivity control agent and method
US7893003B2 · kind B2 · utility
5Cited by
13References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 23, 2009 |
| Grant date | Feb 22, 2011 |
| Priority date | — |
| Expiry date | Feb 23, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F2400/02
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present disclosure provides a Ziegler-Natta catalyst composition comprising a procatalyst, a cocatalyst and a mixed external electron donor comprising a first selectivity control agent, a second selectivity control agent, and an activity limiting agent. A polymerization process incorporating the present catalyst composition produces a high-stiffness propylene-based polymer with a melt flow rate greater than about 50 g/10 min. The polymerization process occurs in a single reactor, utilizing standard hydrogen concentration with no visbreaking.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.