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Metallocene-catalyzed olefin polymerization in the absence of aluminoxane

  • US 6,121,394 A
  • Filed: 05/25/1995
  • Issued: 09/19/2000
  • Est. Priority Date: 07/24/1990
  • Status: Expired due to Term
First Claim
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1. A method for polymerizing an α

  • -olefin comprising by bringing the α

    -olefin into contact with a catalyst which is obtained by reacting a halogenated metallocene compound with an organometallic compound, and then bringing the resultant reaction product into contact with an ionic compound or an electrophilic compound;

    wherein the halogenated metallocene compound is a compound represented by the formula (I) or (II) ##STR4## wherein A and B or A'"'"' and B'"'"' are mutually identical or different and are unsaturated hydrocarbon residues coordinated to a central atom;

    R is a divalent straight-chain hydrocarbon residue which may have a side chain;

    or a residue in which a part or all of the carbon atoms of the straight-chain may be substituted by silicon atoms, germanium atoms or tin atoms;

    X is a halogen atom; and

    M is a zirconium atom or a hafnium atom;

    the organometallic compound is triethylaluminum, tripropylaluminum, triisopropylaluminum, tributylaluminum, triisobutylaluminum, tripentylaluminum, trihexylaluminum, triheptylaluminum, trioctylaluminum, tridecylaluminum, isoprenylaluminum, diethylaluminum hydride, diisopropylaluminum hydride, diisobutylaluminum hydride, diethylzinc, diphenylzinc, divinylzinc, dimethylmagnesium, diethylmagnesium, dibutylmagnesium, dihexylmagnesium or butylethylmagnesium;

    the ionic compound is represented by the formula (V)
    
    
    space="preserve" listing-type="equation">[Q].sub.m [Y].sub.m- (V)wherein Q is a cationic component of the ionic compound, and is selected from carbonium cation, tropylium cation, ammonium cation, oxonium cation, sulfonium cation and phosphonium cation, cations of metals and cations of organometals which are easily reduced, Y is an anionic component of the ionic compound selected from the anionic components of an ionic organoboron, organoaluminum, organogallium, organophosphorus, organoarsenic and organoantimony, and m denotes valency and the electrophilic compound comprises magnesium halides or inorganic oxides having Lewis acidity, which method is performed in the absence of an aluminoxane.

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