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
US6538082B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 5, 2000 |
| Grant date | Mar 25, 2003 |
| Priority date | — |
| Expiry date | Dec 5, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/943
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Novel asymmetric silicon-bridged metallocenes useful as catalysts in the polymerization of olefins and process for preparing said metallocenes.The novel metallocenes are represented by the general formula (I):(SiR′R″)(Cp)(Cp′)MXX′  (I) whereinCp is a partially or fully hydrogenated fluorenyl moiety selected from those of formula (II) and (III) Cp′ is an indenyl group selected from those of formula (IV) M represents a transition metal selected from Ti, Zr and Hf,X and X′ represent, same or different from each other, a halogen atom,R1, R2 and R3 are, same or different from each other, an alkyl group containing 1 or 2 carbon atoms, an aryl group containing from 6 to 10 carbon atoms or a hydrogen atom,(SiR′R″) is a divalent group which bridges the two groups Cp and Cp′ repectively on position 9 and 1,R′ and R″ are, same or different from each other, an alkyl or aryl group containing from 1 to 10 carbon atoms.Process for producing said metallocenes and process for the polymerization of &agr;-olefins such as ethylene and propylene by means of said metallocenes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.