At least 10000 polyethylene molecules per zirconium atom can be obtained with a Ziegler catalyst made up of Cp2ZrMe2 and [Al(Me)O]n. Depending upon the conditions, the molecular weight of the polymer lies between 100000 and 200000. All the results available so far are in accord with the following concept: A molecule of organozirconium compound diffuses into an associate of aluminoxanes. H-transfer leads to zirconium hydrides which add ethylene to form alkyl compounds and thus give rise to active sites.
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