Long-Chain Branched Polyethene via Metallocene-Catalysis: Comparison of Catalysts

  • Esa Kokko
  • Petri Lehmus
  • Anneli Malmberg
  • Barbro Löfgren
  • Jukka V. Seppälä
Conference paper

Abstract

Metallocene catalysts have enabled the production of long-chain branched (LCB) polyethene at low pressure and temperature. The assumed LCB mechanism for the branched structure is the copolymerization of vinyl terminated macromonomers with ethene. In order to obtain LCB polyethene effectively, the employed metallocene-catalyst should be able to produce polyethene with vinyl terminals and effectively copolymerize the formed macromonomers with ethene. We present results of our recent investigation in which we have compared the properties of polyethenes polymerized with five conventional metallocene catalysts activated with methylaluminoxane (MAO); Et[Ind]2ZrCl2, Et[H4Ind]2ZrCl2, (n-BuCp)2ZrCl2, Me2Si[Ind]2ZrCl2 and Cp2ZrCl2. We have examined and discussed the relation between chain transfer mechanisms, hydrogen effect, copolymerization abilities, and rheological behavior of the polyethenes.

Keywords

Chain Transfer Ethene Concentration Hydrogen Effect Metallocene Catalyst Monomer Reactivity Ratio 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© Springer-Verlag Berlin Heidelberg 2001

Authors and Affiliations

  • Esa Kokko
    • 1
  • Petri Lehmus
    • 2
  • Anneli Malmberg
    • 2
  • Barbro Löfgren
    • 1
  • Jukka V. Seppälä
    • 1
  1. 1.Department of Chemical TechnologyHelsinki University of TechnologyHutFinland
  2. 2.Borealis PolymersPorvooFinland

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