Asymmetric silicon-bridged metallocenes useful as catalysts in the polymerization of &agr;-olefins, process for their preparation and use of said metallocenes for the polymerization of &agr;-olefins
US6355747B1 · kind B1 · utility
12Cited by
1References
5Claims
0Family size
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Key dates
| Filing date | Aug 17, 1999 |
| Grant date | Mar 12, 2002 |
| Priority date | — |
| Expiry date | Aug 17, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/943
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Asymmetric silicon-bridged metallocenes represented by the general formula: whereinM represents a transition metal selected from Ti, Zr and Hf.X and X′ represent a halogen atom,R1, R2, R3 represent alkyl groups containing 1 or 2 carbon atoms or hydrogen atoms, providing that at least two of R1, R2, R3 are alkyl groups, andR4 and R5 represent alkyl or aryl group containing from 1 to 10 carbon atoms. A process for their preparation and polymerization of olefins in the presence of the asymmetric silicon-bridged metallocenes are disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.