Polyolefin production
US6515086B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 18, 2000 |
| Grant date | Feb 4, 2003 |
| Priority date | — |
| Expiry date | Feb 18, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/943
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for preparing polyolefins having a monomer length of up to C10, which comprises first contacting: (1) a metallocene catalyst component for the preparation of a polyolefin which comprises an isotactic polyolefin or syndiotactic/isotactic block polyolefin having a monomer length of up to C10, the component having the general formula:R″(CpR1R2R3)(Cp′R1′R2′)MQ2wherein Cp is a cyclopentadienyl ring substituted with at least one substituent of R1R2 and/or R3; Cp′ is a substituted fluorenyl ring with substituents R1′ and R2′; R″ is a structural bridge imparting stereorigidity to the component; R1 is a substituent on the cyclopentadienyl ring which is distal to the bridge; R2 is a substituent on the cyclopentadienyl ring which is proximal to the bridge and positioned either non-vicinal or vicinal to the distal substituent; R3 is a substituent on the cyclopentadienyl ring which is proximal to the bridge; R1′ and R2′ are each independently substituent groups on the fluorenyl ring; M is a Group IVB transition metal or vanadium; and each Q is hydrocarbyl, and (2) an aluminum- or boron-containing co-catalyst capable of activa…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.