Process and catalyst for producing isotactic polyolefins
US6262199A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 29, 1998 |
| Grant date | Jul 17, 2001 |
| Priority date | — |
| Expiry date | May 29, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/943
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
This invention is for a metallocene catalyst component comprising a bridged metallocene in which the two substituted indenyl rings are complexed to a metal hydrocarbyl or metal halide. This metallocene catalyst component is useful for polymerizing olefins having three or more carbon atoms to produce a polymer with a isotactic stereochemical configuration. The catalyst component is a stereorigid metallocene described by the formula: EQU R"(CpR.sub.2 C.sub.4 R.sub.4)(CpR'.sub.2 C.sub.4 R'.sub.4)MeQ.sub.k wherein (CpR.sub.2 C.sub.4 R.sub.4) and (CpR.sub.2 C.sub.4 R.sub.4) are substituted indenyl rings; each R and R' is a hydrogen or a hydrocarbyl radical having 1-20 carbon atoms; R" is a structural bridge between the two indenyl rings imparting stereorigidity to the indenyl rings; Me is a transition metal; and each is a hydrocarbyl radical or is a halogen. Further, one R and R' is a hydrocarbyl radical having 1-20 carbon atoms in a proximal position adjacent to the bridgehead carbon of the indenyl rings. The invention also includes a process of preparing isotactic polyolefins that comprises the use of one or more of the disclosed catalyst components and also a process for preparing th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.