Modified (MAO + aluminum alkyl) activator
AssigneeNOVA Chemicals (International) S.A.
InventorsIsam Jaber, John Swabey, Xiaoliang Gao, Charles Carter, Cliff Baar
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Abstract
A cocatalyst system for olefin polymerization comprises an aluminoxane (especially methylaluminoxane, or “MAO”), an aluminum alkyl and a halogenated phenol. The preferred halogenated phenol is pentafluorophenol. The use of pentafluorophenol permits the substitution of a portion of the MAO cocatalyst (which is expensive) with inexpensive aluminum alkyl. The cocatalyst is most preferably employed in combination with an organometallic catalyst having at lease one pi ligand.
Claims13
A cocatalyst system for olefin polymerization comprising:
- 1) methylaluminoxane having a molar aluminum concentration of A1;
- 2) additional aluminum alkyl in a molar amount A2, wherein said aluminum alkyl is defined by the formula Al(R)a(OR)bXx;
- wherein each R and R1 is a C1 to 10 hydrocarbyl;
- X is a halide;
- and
- a+b+c=3 with the provisos that a≧2 land A2<A1;
- and
- 3) a halogenated phenol.
A catalyst system for olefin polymerization comprising (A) a group 3-10 metal catalyst;
- and (B) a catalyst activator system comprising a cocatalyst system for olefin polymerization comprising:
- 1) methylaluminoxane having a molar alumina concentration of A1;
- 2) additional aluminum alkyl in a molar amount A2, wherein said aluminum alkyl is defined by the formula Al(R)a(OR)bXc;
- wherein each R and R1 is a C1 to 10 hydrocarbyl;
- X is a halide;
- and
- a+b+c=3 with the provisos that a≧1and A2<A1;
- and
- 3) a halogenated phenol.
Dependencies are inferred from the claim text.