Organometal compound catalyst

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.