Polymerization catalyst system and polymerization process
US6291608A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 23, 1998 |
| Grant date | Sep 18, 2001 |
| Priority date | — |
| Expiry date | Dec 23, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F110/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process is provided to prepare polyolefins having a multimodal molecular weight distribution comprising contacting at least one mono-1-olefin in a polymerization zone, under polymerization conditions, with a dual catalyst system comprising a first catalyst system which comprises a metallocene catalyst and a cocatalyst and a second catalyst system which comprises diimine nickel complexes which further comprise additional ligands selected from the group consisting of .varies.-deprotoned-.beta.-diketones, .varies.-deprotoned-.beta.-ketoesters, halogens and mixtures thereof. The resultant, recovered polymer has at least a bimodal, or broad, molecular weight distribution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.