Process to produce bimodal polyolefins with metallocene catalysts using two reaction zones
US6380311B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 7, 2000 |
| Grant date | Apr 30, 2002 |
| Priority date | — |
| Expiry date | Feb 7, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2314/06
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for the preparation of polyolefins having a bi- or multimodal molecular weight distribution, the process comprising the steps of: (i) contacting an olefin monomer and a first co-reactant with a catalyst system in a first reaction zone under first polymerization conditions to produce a product comprising a first polyolefin having a first molecular weight distribution; and (ii) contacting an olefin monomer and a second co-reactant with a catalyst system in a second reaction zone under second polymerization conditions to produce a product comprising a second polyolefin having a second molecular weight distribution different from the first molecular weight distribution; wherein the first and second polyolefins are mixed together, wherein one of the co-reactants is hydrogen and the other is a comonomer selected from butene, methylpentene, hexene or octene, and wherein each catalyst system comprises (a) a metallocene catalyst component comprising a bis tetrahydroindenly compound of the general formula (IndH4)2R″MQ2 in which each Ind is the same or different and is indenyl or substituted indenyl, R″ is a bridge which comprises a C1-C4 alkylene radical, a dialkly mern…
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