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Catalyst composition and process for polymerizing polymers having multimodal molecular weight distribution

  • US 5,032,562 A
  • Filed: 12/27/1989
  • Issued: 07/16/1991
  • Est. Priority Date: 12/27/1989
  • Status: Expired due to Term
First Claim
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1. An olefin polymerization catalyst precursor composition supported on a porous carrier which has active OH groups comprising a magnesium compound, a zirconium compound, and TiCl4, wherein the magnesium compound has the formula:

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    space="preserve" listing-type="equation">Mg(OR).sub.2, R.sup.1.sub.m MgR.sup.2.sub.n or R.sup.3.sub.k MgX.sub.(2-k)where R, R1, R2, and R3 each are each alkyl groups, X is a halogen, m and n are each 0, 1 or 2, providing that m+n equals the valence of Mg, and k is 0, 1, or 2; and

    wherein the zirconium compound has the formula
    
    
    space="preserve" listing-type="equation">Cp.sub.m ZrY.sub.n X.sub.(2-m)wherein Cp is cyclopentadienyl, m is 1, 2 or 3, Y and X are each the same or different halogen, a C1 -C6 alkyl or hydrogen and n is 0 or 1, which is produced by impregnating a reaction product of said carrier and said magnesium compound with said zirconium compound;

    wherein the reaction product is treated with said titanium compound prior to impregnating.

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