Process for production of high molecular weight EPDM elastomers using a metallocene-alumoxane catalyst system
Patent 5229478 Issued on July 20, 1993. Estimated Expiration Date: 
October 9, 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.
October 9, 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.Patent ReferencesProcess for the preparation of polyolefins New polymerization catalyst Process for production of a high molecular weight ethylene -olefin elastomer with a metallocene alumoxane catalyst Patent #: 5001205 InventorsAssigneeApplicationNo. 594776 filed on 10/09/1990US Classes:526/160, Transition metal bonded to carbon atom526/127, Contains non-transition free metal, hydride thereof, or carbon to non-transition metal atom bond526/129, Silicon present in inorganic oxygen-containing compound526/282, Contains an exterior ethylenic substituent bonded to a single carbon atom of the bridged ring system526/283, Compound containing dicyclopentadiene moiety526/336, Ethylenic groups are non-conjugated, e.g., divinylbenzene, etc.526/943POLYMERIZATION WITH METALLOCENE CATALYSTSExaminersPrimary: Teskin, FredAttorney, Agent or FirmForeign Patent References
International ClassesC08F 004/64C08F 236/20 AbstractA process for producing a high molecular weight EPDM elastomer having low crystallinity using a bridged bis-metallocene-alumoxane catalyst wherein the metallocene component of the catalyst has the formula: ##STR1## wherein "M" is titanium, zirconium or hafnium; each "R1 " independently is a C1 to C20 linear, branched or cyclic alkyl group or a C2 to C4 alkylene which forms a fused ring system; "R2 " is a C1 to C6 linear, branched or cyclic alkylene group, an alkyl substituted silanylene group or an alkyl substituted silaalkylene group; each "X" independently is a halogen, hydride, alkyl, aryl or chelating group, and "y" is an integer of 2 to 4.Other References
Field of SearchTransition metal bonded to carbon atomContains non-transition free metal, hydride thereof, or carbon to non-transition metal atom bond Silicon present in inorganic oxygen-containing compound Contains an exterior ethylenic substituent bonded to a single carbon atom of the bridged ring system Compound containing dicyclopentadiene moiety Ethylenic groups are non-conjugated, e.g., divinylbenzene, etc. | |
