Bridged metallocenes for use in catalyst systems
US6002033A · kind A · utility
49Cited by
3References
21Claims
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Key dates
| Filing date | Jun 12, 1998 |
| Grant date | Dec 14, 1999 |
| Priority date | — |
| Expiry date | Jun 12, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/943
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Bridged metallocenes of Group IVb metals provide improved results when the bridge comprises a neutral electron-donor substituent of general formula EQU R'" Z R"".sub.j wherein PA1 R'" is a rigid unsaturated hydrocarbon radical between Z and the bridge, such that Z is separated from the bridge by 2 to 5 carbon atoms PA1 Z is nitrogen, phosphorus, oxygen or sulphur, PA1 R"" is H or an alkyl, cycloalkyl, aryl, alkylaryl or arylalkyl having a maximum of 15 carbon atoms, each R"" being the same or different, PA1 j is 1 when Z=O or S and 2 when Z=N or P.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.