New Isotactic Polypropylenes via Metallocene Catalysts

  • W. Spaleck
  • M. Antberg
  • M. Aulbach
  • B. Bachmann
  • V. Dolle
  • S. Haftka
  • F. Küber
  • J. Rohrmann
  • A. Winter


Chiral bridged bisindenyl zirconoeenes with special substitution patterns on the aromatic rings are potentially commercial catalysts for the production of isotactic polypropylenes. The performance characteristics of these systems are different, the variations being induced by size and position of the substituents. The novel catalysts will be used for the production of new iPP grades with enhanced properties or unprecedented property combinations. Typical features of metailocene iPP polymers are higher stiffness, higher transparency, and a lower level of extractables than conventional products. The most recent new designs of metailocene PP catalysts are discussed. These include asymmetric systems and metallocenes inducing two-step-polymerization mechanisms.


Isotactic Polypropylene Metallocene Catalyst Polymerization Procedure Liquid Propylene Atactic Polypropylene 
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.

List of Abbreviations and Symbols


atactic polypropylene






maximum of loss factor


melting enthalpy


electron donor






isotactic polypropylene




percentage of isotactic pentades


molecular mass (number average)


melting point


molecular mass (weight average)


molecular weight distribution






glass transition temperature


melting point


polymerization temperature


polymerization time


weight percent


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Copyright information

© Springer-Verlag Berlin Heidelberg 1995

Authors and Affiliations

  • W. Spaleck
    • 1
  • M. Antberg
    • 1
  • M. Aulbach
    • 1
  • B. Bachmann
    • 1
  • V. Dolle
    • 1
  • S. Haftka
    • 1
  • F. Küber
    • 1
  • J. Rohrmann
    • 1
  • A. Winter
    • 1
  1. 1.Hoechst AGFrankfurt a. M.Germany

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