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Mixed metallocene catalyst systems containing a poor comonomer incorporator and a good comonomer incorporator

  • US 7,141,632 B2
  • Filed: 04/02/2004
  • Issued: 11/28/2006
  • Est. Priority Date: 07/19/2001
  • Status: Expired due to Term
First Claim
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1. A process for polymerizing olefin(s) to produce a polymer product, the process comprising contacting ethylene and at least one comonomer with a catalyst system, wherein the catalyst system comprises a poor comonomer incorporating catalyst compound comprising a metallocene structure comprising at least one fused ring cyclopentadienyl ligand bridged to another cyclopentadienyl ligand, where the bridge is a long bridge defined as a bridge containing an Si-O-Si group, and a good comonomer incorporating catalyst compound;

  • wherein the poor incorporator metallocene is a polymerization catalyst which when run under process conditions wherein (Ind)2ZrCl2 would produce a 0.920 g/cm3 density polyethylene, produces a polymer with a density greater than 0.920 g/cm3;

    further comprising isolating a polymer product having a density of from 0.910 to 0.940 g/cm3, an Mw/Mn value of from 2 to less than 10 and an I2 value of from 0.1 to 100 dg/min.

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