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Ethylene elastomer compositions

  • US 20080287620A1
  • Filed: 05/14/2007
  • Published: 11/20/2008
  • Est. Priority Date: 05/14/2007
  • Status: Active Grant
First Claim
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1. A process for producing an elastomer composition, the process comprising:

  • contacting a catalyst system comprising at least one metallocene catalyst compound and a non-coordinating anion activator with a monomer mixture comprising ethylene, at least one alpha-olefin, and at least one diene;

    wherein said at least one metallocene catalyst compound comprises an indenyl (In) complex having the general formula;

    (In1R1m)R3(In2R2p)MXq;

    wherein the or each R1 is a substituent of the indenyl ring In1 and the or each R2 is a substituent of the indenyl ring In2, each R1 and R2 is, independently, a halogen or a hydrocarbyl, halocarbyl, hydrocarbyl-substituted organometalloid or halocarbyl-substituted organometalloid group containing up to about 20 carbon atoms, and at least one R1 or R2 substituent is bonded to the 2-position or the 4-position of its associated indenyl ring;

    m is 1 to 6;

    p is 1 to 6;

    R3 is a bridging group, such that the number of atoms in the direct chain between the (In1R1m) ligand and the (In2R2p) ligand is from 1 to 8, M is a transition metal from Group 3, 4, 5 or 6 of the Periodic Table of the Elements, or an actinide or lanthanide metal atom;

    q is equal to the valence of M minus 2; and

    each X is a non-cyclopentadienyl ligand and is, independently, a hydrocarbyl, oxyhydrocarbyl, halocarbyl, hydrocarbyl-substituted organometalloid, oxyhydrocarbyl-substituted organometalloid or halocarbyl-substituted organometalloid group containing up to about 20 carbon atoms;

    provided that two X groups may be joined and bound to the metal atom to form a metallacycle ring containing from about 3 to about 20 carbon atoms;

    or two X groups together can be an olefin, diolefin or aryne ligand.

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