Olefin polymerization catalysts
Patent 5055438 Issued on October 8, 1991. Estimated Expiration Date: 
June 4, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
June 4, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.InventorAssigneeApplicationNo. 533245 filed on 06/04/1990US Classes:502/117, Component B metal is other than titanium or vanadium502/103, Component A metal is Group IA, IIA or IIIA and component B metal is Group IVB to VIIB or VIII (i.e., alkali metal, alkaline earth Metal, Be, Mg, Al, Ga, In or Tl and Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Mn, Tc, Re, iron Group or Platinum group) (e.g., Ziegler Catalyst, etc.)502/121, Nonmetallic organic phosphorus containing502/122, Nonmetallic organic sulfur containing502/123, Nonmetallic organic nitrogen containing502/124, Including element in addition to carbon, hydrogen, and nitrogen (e.g, nitro, etc.)502/125, Nonmetallic organic oxygen containing526/141, Non-metal material is organic nitrogen-containing compound526/160, Transition metal bonded to carbon atom526/943, POLYMERIZATION WITH METALLOCENE CATALYSTS556/11Heavy metal bonded directly to unsaturated five-membered carbocyclic ringExaminersPrimary: Garvin, Patrick P.Foreign Patent References
International ClassC08F 004/642AbstractThe invention is a polymerization catalyst system including an alumoxane and a Group IV B metallocene having a heteroatom ligand. The catalyst system can be employed to polymerize olefins to produce a high molecular weight polymer.Field of SearchComponent A metal is Group IA, IIA or IIIA and component B metal is Group IVB to VIIB or VIII (i.e., alkali metal, alkaline earth Metal, Be, Mg, Al, Ga, In or Tl and Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Mn, Tc, Re, iron Group or Platinum group) (e.g., Ziegler Catalyst, etc.)Component B metal is other than titanium or vanadium Nonmetallic organic phosphorus containing Nonmetallic organic sulfur containing Nonmetallic organic nitrogen containing Including element in addition to carbon, hydrogen, and nitrogen (e.g, nitro, etc.) Nonmetallic organic oxygen containing |
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