Abstract
AbstractThe supported metallocene catalysts were obtained on the layered silicate montmorillonite (MMT), using AlMe3 and AliBu3 for synthesis of alkylaluminoxane directly on a support surface, followed by metallocene supporting. It was shown that the MMT‐H2O/AliBu3 forms with ansa‐Zr‐cenes of C1 and C2‐symmetry the significantly more active supported metal‐alkyl complexes in propene polymerization, than MMT‐H2O/AlMe3. The MMT‐H2O/AliBu3 is the effective activator of the ansa‐Hf‐cenes, in contrast to MAO and MMT‐H2O/AlMe3, giving the high active supported catalysts for synthesis of isotactic and elastic polypropene. The character of influence of metallocene fixation on support on the isotactic pentad [mmmm] content in polymer, compared to homogeneous analogues, depends on the metallocene nature. The introduction of borate Ph3CB(C6F5)4 in the case of both Zr‐cene and Hf‐cene catalysts increases significantly the activity at the reduced ratio of Al/Zr, Hf (100–500 instead of 2000–3000) and stabilizes the catalytic complexes.
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