Basell Polyolefine Gmbh

Frank Küber

Andreas Winter

Walter Spaleck

Volker Dolle

Martin Antberg

Bernd Bachmann

Jürgen Rohrmann

A process for the preparation of an olefin polymer by polymerization or copolymerization of an olefin of the formula R&#x2014;CH&#x2550;CH&#x2014;R, in which Rand Rare identical or different and are a hydrogen atom or a hydrocarbon radical having 1 to 14 carbon atoms or Rand R, together with the atoms connecting them, can form a ring, at a temperature of from &#x2212;60&#xb0; to 200&#xb0; C., at a pressure of from 0.5 to 100 bar, in solution, in suspension or in the gas phase, in the presence of a catalyst formed from a metallocene in the meso-form or a meso:rac mixture, with meso:rac&#x3e;1:99, as transition-metal compound and a cocatalyst, wherein the metallocene is a compound of the formula I,in which Mis Zr or Hf, Rand Rare identical or different and are methyl or chlorine, Rand Rare identical or different and are methyl, isopropyl, phenyl, ethyl or trifluoromethyl, Rand Rare hydrogen or as defined for Rand R, or Rforms an aliphatic or aromatic ring with R, or adjacent radicals Rform a ring of this type, and Ris aradical, and m plus n is zero or 1.

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Oberusel, Germany

Frank Küber