Polymerization process
US6300437A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 1997 |
| Grant date | Oct 9, 2001 |
| Priority date | — |
| Expiry date | Jul 31, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/943
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for preparing polyolefins having at least 0.01 long chain branches (LCB)/1000 carbon atoms along the polymer backbone as measured by flow activation and a molecular weight distribution greater than 2.5 comprises polymerization in the presence of a metallocene complex having the formula: ##STR1## wherein PA1 Cp.sup.1, Cp.sup.2 are independently a substituted or unsubstituted indenyl or hydrogenated indenyl group, PA1 Y is a univalent anionic ligand, PA1 M is zirconium, titanium or hafnium, and PA1 Z is a bridging group comprising an alkylene group having 1 to 20 carbon atoms or a dialkyl silyl- or germyl- group, or alkyl phophine or amine radical. Polyolefins prepared from such a process show specific flow activation energy/LCB relationships.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.