Open-pentadienyl metallocenen ligands, polymerization catalysts/catalyst precursors and polymers therefrom
US6069237A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 11, 1995 |
| Grant date | May 30, 2000 |
| Priority date | — |
| Expiry date | Sep 11, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F4/61912
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
New metallocene ligand systems and catalysts/catalyst precursors are described where the ligand system contains at least one open-pentadienyl ligand characterized by an acyclic six .pi. electron delocalized, five atomic center structure. The open pentadienyl ligand is bonded to either another pentadienyl ligand or a Cp ligand by a bridging group. The metal is from group 3-5 or the Lanthanides. These metallocene catalysts/catalyst precursors optionally in combination with co-catalysts can be used to generate a wide variety of different polymer types including HDPE, LLDPE, LHDPE, ethylene/propylene elastomers, tactiospecific C3+ .alpha.-olefins, intimate mixture thereof and the like.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.