Process and catalyst for polyolefin density and molecular weight control
Patent 5324800 Issued on June 28, 1994. Estimated Expiration Date: 
August 30, 2011. 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.
August 30, 2011. 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.Patent References 3104249 3161629 Preparing ethylene polymers using Ziegler catalyst comprising cyclodienyl compound of zirconium Process for the preparation of polyolefins Patent #: 4542199 InventorsAssigneeApplicationNo. 752415 filed on 08/30/1991US Classes:526/160, Transition metal bonded to carbon atom502/103, 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.)502/117, Component B metal is other than titanium or vanadium526/127, Contains non-transition free metal, hydride thereof, or carbon to non-transition metal atom bond526/129, Silicon present in inorganic oxygen-containing compound526/150, At least one atom of Ge, Sn, or Pb in elemental form or bonded to hydrogen or carbon atom526/156, Inorganic oxygen containing aluminum compound526/348, From hydrocarbon526/352, From ethylene only526/904, MONOMER POLYMERIZED IN PRESENCE OF TRANSITION METAL CONTAINING CATALYST AT LEAST PART OF WHICH IS SUPPORTED ON A POLYMER; E.G., PREPOLYMERIZED CATALYSTS, ETC.526/943POLYMERIZATION WITH METALLOCENE CATALYSTSExaminersPrimary: Smith, Edward J.Attorney, Agent or FirmForeign Patent References
International ClassesC08F 004/602C08F 010/00 AbstractCatalysts comprising (a) derivatives of mono, bi and tricyclopentadienyl coordination complexes with a transition metal and (b) and an alumoxane are employed in a process of producing polyolefins of controlled molecular weight.Other References
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 Contains non-transition free metal, hydride thereof, or carbon to non-transition metal atom bond Transition metal bonded to carbon atom Contains non-transition elemental metal, hydride thereof, or carbon to non-transition metal atom bond At least one atom of Ge, Sn, or Pb in elemental form or bonded to hydrogen or carbon atom |
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