Organic compounds -- part of the class 532-570 series – Organic compounds – Heavy metal containing
Reexamination Certificate
2005-05-17
2005-05-17
Bell, Mark L. (Department: 1755)
Organic compounds -- part of the class 532-570 series
Organic compounds
Heavy metal containing
C356S027000, C356S043000, C356S053000, C356S058000
Reexamination Certificate
active
06894179
ABSTRACT:
This invention relates to metallocene compositions and their use in the preparation of catalyst systems for olefin polymerization, particularly propylene polymerization. The metallocene compositions are generally those of the bridged bis(2-R3-4-phenylindenyl)metallocene type wherein the bridge is represented by the formula:wherein: R17to R24are identical or different and are one of a hydrogen atom, a C1-C10alkyl group, a C1-C10alkoxy group, a C6-C10aryl group, a C6-C10aryloxy group, a C2-C10alkenyl group, a C7-C40arylalkyl group, a C7-C40alkylaryl group, a C8-C40arylalkenyl group, or a halogen atom, or a conjugated diene which is optionally substituted with one or more hydrocarbyl, tri(hydrocarbyl)silyl groups or hydrocarbyl, tri(hydrocarbyl)silylhydrocarbyl groups, said diene having up to 30 atoms not counting hydrogen; or two or more adjacent radicals R17to R24, including R20and R21, together with the atoms connecting them form one or more rings; preferably, R17to R24are hydrogen, and M2is carbon, silicon, germanium or tin, preferably silicon.
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Abstract for EP0576970, Jan. 5, 1994, Küber et al.
Burkhardt Terry J.
Haygood, Jr. William T.
Kuchta Matthew C.
Li Robert T.
Stehling Udo M.
Bell Mark L.
Exxon Mobil Chemical Patents Inc.
Pasterczyk J.
Schmidt Page
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