Dual metallocene catalysts for polymerization of bimodal polymers
US8138113B2 · kind B2 · utility
71Cited by
130References
21Claims
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Key dates
| Filing date | Apr 26, 2011 |
| Grant date | Mar 20, 2012 |
| Priority date | — |
| Expiry date | Apr 26, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/943
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
This invention relates to catalyst compositions, methods, and polymers encompassing at least one first Group 4 metallocene compound comprising bridging η5-cyclopentadienyl-type ligands, in combination with at least one second Group 4 metallocene with non-bridging η5-cyclopentadienyl-type ligands, typically in combination with at least one cocatalyst, and at least one activator. The compositions and methods disclosed herein provide ethylene polymers with a bimodal molecular weight distribution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.