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This invention provides catalyst compositions that are useful for polymerizing at least one monomer to produce a polymer. This invention also provides catalyst compositions that are useful for polymerizing at least one monomer to produce a polymer, wherein said catalyst composition comprises a post-

This invention provides catalyst compositions that are useful for polymerizing at least one monomer to produce a polymer. This invention also provides catalyst compositions that are useful for polymerizing at least one monomer to produce a polymer, wherein said catalyst composition comprises a post-contacted organometal compound, a post-contacted organoaluminum compound, and a post-contacted treated solid oxide compound.

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1. A polymer produced using a polymerization process comprising contacting, under polymerization conditions, at least one monomer and a catalyst composition which is substantially free of aluminoxanes;wherein the catalyst composition is produced by a process comprising: (1) contacting alumina with a

1. A polymer produced using a polymerization process comprising contacting, under polymerization conditions, at least one monomer and a catalyst composition which is substantially free of aluminoxanes;wherein the catalyst composition is produced by a process comprising: (1) contacting alumina with a solution containing a zirconium tetraalkoxide, (Zr(OR)4), where R is an aliphatic radical containing one to twelve carbons, to produce a zirconium-containing alumina having from 1 to 10 weight percent zirconium based on the weight of the zirconium-containing alumina before calcining; (2) calcining the zirconium-containing alumina at a temperature within a range of 350 to 600° C. for 3 to 20 hours to produce a calcined composition; (3) contacting the calcined composition with carbon tetrachloride in an amount equal to 0.05 to 1 times the weight of the alumina before calcining for 10 minutes to 30 minutes to produce a chlorided, zirconium-containing alumina; (4) combining the chlorided, zirconium-containing alumina and bis(n-butylcyclopentadienyl) zirconium dichloride at a temperature within a range of 15° C. to 80° C. for about 1 minute to 1 hour to produce a mixture; and (5) combining the mixture with triethylaluminum to produce the catalyst composition. 2. An article that comprises the polymer produced according to claim 1.3. The The polymer of claim 1, wherein the zirconium tetraalkoxide is zirconium tetrapropoxide or zirconium tetrabutoxide.4. The polymer of claim 1, wherein the chlorided zirconium-containing alumina is contacted with at least one additional metal.5. The polymer of claim 4, wherein the one additional metal is selected from zinc, silver, copper, antimony, gallium, tin, nickel, tungsten, or mixtures thereof.6. The polymer of claim 1, wherein the polymerization conditions comprise slurry polymerization conditions.7. The polymer of claim 6, wherein the polymerization takes place in a loop reaction zone.8. The polymer of claim 7, wherein the polymerization is conducted in the presence of a diluent that comprises, in major part, isobutane.9. The polymer of claim 1, wherein the catalyst composition has an activity greater than 500 g/g/hr under slurry polymerization conditions, using isobutane as a diluent, with a polymerization temperature of 90° C., and an ethylene pressure of 550 psig.10. The polymer of claim 1, wherein at least one monomer is ethylene.11. The polymer of claim 1, wherein the polymer comprises ethylene and at least one aliphatic 1-olefin having 3 to 20 carbon atoms per molecule.12. The polymer of claim 11, wherein the aliphatic 1-olefin having 3 to 20 carbon atoms per molecule is selected from propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, or 1-octene, or mixture thereof.13. The polymer of claim 1, wherein at least one monomer is selected from ethylene, propylene, 1-butene, 3-methyl-1-butene, 1-pentene, 3-methyl-1-pentene, 4-methyl-1-pentene, 1-hexene, 3-ethyl-1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, 1,3-butadiene, isoprene, piperylene, 2,3-dimethyl-1,3-butadiene, 1,4-pentadiene, 1,7-hexadiene or mixture thereof.14. The polymer of claim 1, wherein the weight ratio of the post-contacted triethylaluminum to the post-contacted chlorided zirconium-containing alumina in the catalyst composition ranges from about 5:1 to about 1:1000.15. The polymer of claim 1, wherein the weight ratio of the post-contacted chlorided zirconium-containing alumina to the post-contacted bis(n-butylcyclopentadienyl) zirconium dichloride in the catalyst composition ranges from about 10,000:1 to about 1:1.16. The article of claim 2, wherein the article is selected from household containers, utensils, film products, drums, fuel tanks, pipes, geomembranes or liners.