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Dual site catalyst system comprising a hafnocene component for the production of bimodal polyolefins in a single reactor

A metallocene catalyst, polyolefin technology, applied in the field of catalyst systems, can solve the problems of low activity and the like

Inactive Publication Date: 2005-10-19
TOTAL RES & TECH FELUY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, their activity is rather low

Method used

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  • Dual site catalyst system comprising a hafnocene component for the production of bimodal polyolefins in a single reactor
  • Dual site catalyst system comprising a hafnocene component for the production of bimodal polyolefins in a single reactor
  • Dual site catalyst system comprising a hafnocene component for the production of bimodal polyolefins in a single reactor

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Embodiment Construction

[0021] The hafnium-based metallocene component of the present invention has the following formula structure:

[0022] R” s (CpR n ) g (CpR n )MQ 3-g (I)

[0023] in

[0024] - each Cp is a substituted or unsubstituted cyclopentadienyl ring;

[0025] - each R may be the same or different and is a hydrogen or hydrocarbyl group, such as an alkyl, alkenyl, aryl, alkylaryl or aralkyl group or two carbon atoms containing 1 to 20 carbon atoms connected to form a C4-C6 ring;

[0026] -R" is a structural bridge between two Cp rings;

[0027] -M is hafnium;

[0028] -Q is a hydrocarbyl group such as an aryl, alkyl, alkenyl, alkylaryl or aralkyl group containing 1-20 carbon atoms, a hydrocarboxy group or halogen containing 1-20 carbon atoms , and they can be the same or different from each other;

[0029] -s is 0 or 1, g is 0, 1 or 2, and when g is 0, s is 0, when s is 1, n is 4, and when s is 0, n is 5.

[0030] By substitution, it means that the substituent which replaces...

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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 co-ordinating capability.

Description

technical field [0001] The present invention relates to a hafnium-based metallocene catalyst component and a catalyst system for preparing broad molecular weight distribution or multimodal molecular weight distribution polyolefins. The present invention also relates to a process for the polymerization of olefins using the catalyst component in a catalyst system. Background technique [0002] Polyolefins, typically of high molecular weight, such as polyethylene, have improved mechanical properties compared to corresponding low molecular weight materials. However, high molecular weight polyolefins are difficult to process and expensive to manufacture. [0003] For many high density polyethylene (HDPE) applications, it is important that the polyethylene has enhanced toughness, strength and resistance to environmental stress cracking (ESCR). These enhanced properties are easier to achieve with high molecular weight polyethylene. However, as the molecular weight of the polymer...

Claims

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Application Information

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IPC IPC(8): C08F4/64C08F4/70C08F10/00
CPCC08F10/00Y10S526/943Y10S526/941C08F4/65904C08F4/70C08F4/64
Inventor 阿巴斯·拉扎维
Owner TOTAL RES & TECH FELUY
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