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US 2006/0068985 A1Published application
Dual site catalyst system comprising a hafnocene component for the production of bimodal polyolefins in a single reactor
AssigneeTotal Petrochemicals Research Feluy
InventorAbbas Razavi
Life of this patent
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Abstract
The present invention discloses a metallocene catalyst system for producing polyolefins comprising: A. a hafnocene-based catalyst component suitable for producing the high molecular weight fraction of the polyolefin; B. one or more metallocene or post-metallocene components different from the component A and suitable for producing the low molecular weight fraction of the polyolefin; C. an actvating agent having a low or no coordinating capability.
Claims22
1-20. (canceled)
A metallocene catalyst system for producing a polyolefin comprising:
- (a) a first constituent comprising a hafnocene-based catalyst component having at least one cyclopentadienyl group effective for producing a high molecular weight fraction of the polyolefin;
- (b) a second constituent comprising at least one metallocene or post-metallocene component different from component (a) and effective for producing a low molecular weight fraction of the polyolefin and wherein the metallocene catalyst component is unbridged;
- and
- (c) an activating agent having a low or no coordinating capability and selected from the group consisting of a borate, a boronate or an aluminate.
1 more element
A process for the polymerization of an olefin comprising:
- (a) providing a metallocene catalyst system for producing a polyolefin comprising:
- (1) a first constituent comprising a hafnocene-based catalyst component having at least one cyclopentadienyl group effective for producing a high molecular weight fraction of the polyolefin;
- (2) a second constituent comprising at least one metallocene or post-metallocene component different from said first constituent and effective for producing a low molecular weight fraction of the polyolefin and wherein the metallocene catalyst component is unbridged;
- (3) an activating agent having a low or no coordinating capability and selected from the group consisting of a borate, a boronate or an aluminate;
- (b) introducing an olefin monomer and said metallocene catalyst system into a polymerization reaction zone;
- (c) maintaining said reaction zone under polymerization conditions and polymerizing said olefin monomer to produce a polymer of said monomer having a high molecular weight fraction and a low molecular weight fraction;
- and
- (d) extracting said polymer having said high molecular weight and low molecular weight fractions from said polymerization reaction zone.
5 more elements
Dependencies are inferred from the claim text.