Polyionic transition metal catalyst composition
US5427991A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 12, 1993 |
| Grant date | Jun 27, 1995 |
| Priority date | — |
| Expiry date | Mar 12, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F4/65927
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Ionically activated metallocene catalyst compositions which are useful in the polymerization of olefins comprise transition metal cationic components associated with and stabilized by a polyanionic moleties constituted of non-coordinating anionic groups chemically bonded to core components. The transition metal cationic components typically are cyclopentadienyl-group containing Group 4, 5, and 6 metal compounds having a hydrolyzable ligand such that they react with the activator compounds so as to form the cationic components in non-coordinating association with bulky, labile anions derived from the activator compound which in turn is chemically bound to the core component, such as a polymeric or metal oxide support.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.