Vanadium-containing polymerization catalyst
AssigneeQuantum Chemical Corporation
InventorsChi-I Kuo, Michael W. Lynch
Life of this patent
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Abstract
A vanadium-containing catalyst is prepared as the product of admixing an inorganic oxide, inorganic phosphate or mixtures thereof, a zinc-containing composition, and a vanadium-containing composition. An auxiliary compound such as, for example, an aluminum halide compound may optionally be admixed. The catalyst may be combined with a co-catalyst such as an aluminum alkyl and, optionally, a halocarbon promotor to yield an olefin polymerization catalyst system. The resulting catalyst system exhibits high activity, excellent hydrogen response and produces a polymer having a narrow to broad molecular weight distribution with a bimodal profile. The catalyst is especially useful in ethylene homopolymerization and co-polymerization.
Claims41
A catalyst comprising the product obtained by admixing:
- (a) a solid inorganic oxide, inorganic phosphate, or mixtures thereof;
- (b) a zinc-containing composition selected from the group consisting of a zinc compound having the formula
- ZnR.sub.2
- wherein R is a hydrocarbyl having 1 to about 12 carbon atoms, a zinc complex having the formula
- ZnX.sub.2.2AlR.sub.3.sup.1
- wherein X is halogen and R.sup.1 is hydrocarbyl having 1 to about 12 carbon atoms, and mixtures thereof;
- and
- (c) a vanadium-containing composition selected from the group consisting of compounds having the formula
- VX.sub.b.sup.1 (OR.sup.2).sub.a-b
- wherein X.sup.1 is a halogen, R.sup.2 is hydrocarbyl having 1 to about 18 carbon atoms, a is the valence of vanadium and is 3 or 4, and b is 0 or an integer from 1 to a,
- VOX.sup.2 c(OR.sup.3).sub.3-c
- wherein X.sup.2 is halogen, R.sup.3 is hydrocarbyl having 1 to about 18 carbon atoms, and c is 0 or an integer from 1 to 3, and mixtures thereof, wherein said product does not contain titanium.
Dependencies are inferred from the claim text.