Homogeneous α-olefin polymerizations over racemic Ethylene-bridged ansa-Bis(2-(tert-butyldimethylsiloxy)-1-indenyl) and ansa-Bis(2-tert-butyldimethylsiloxy)-4,5,6,7-tetrahydro-1-indenyl metallocene dichlorides

Reko Leino, Hendrik J G Luttikhedde, Petri Lehmus, Carl-Eric Wilén, Rainer Sjöholm, Ari Lehtonen, Jukka V. Seppälä, Jan H. Näsman*

*Corresponding author for this work

    Research output: Contribution to journalArticleScientificpeer-review

    60 Citations (Scopus)

    Abstract

    Ethylene and propylene were polymerized over the siloxy-substituted bis(indenyl) ansametallocenes, rac-[ethylenebis(2-(tert-butyldimethylsiloxy)indenyl)]zirconium dichloride (1), rac-[ethylenebis(2-(tert-butyldimethylsiloxy)-4,5,6,7-tetrahydroindenyl)] zirconium dichloride (2), and rac-[ethylenebis(2-(tert-butyldimethylsiloxy)indenyl)]hafnium dichloride (3), using methylaluminoxane (MAO) and trityl tetrakis(pentafluorophenyl)borate as cocatalysts. Especially complex 1 forms a highly active catalyst precursor for the polymerization of α-olefins. Synthesis and characterization of 2 and 3 are described. The 1/MAO and 3/MAO catalyst systems show high polymerization activities at exceptionally low [Al]: [Zr] ratios [(100-250):1]. For both catalysts, extensive chain transfer to aluminum is observed as the predominant chain-transfer mechanism. Preliminary results from copolymerization of ethylene with 1-hexene and 1-hexadecene over 1/MAO indicate a good comonomer response.

    Original languageEnglish
    Pages (from-to)3477-3483
    Number of pages7
    JournalMacromolecules
    Volume30
    Issue number12
    DOIs
    Publication statusPublished - 16 Jun 1997
    MoE publication typeA1 Journal article-refereed

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