Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Reexamination Certificate
2007-12-18
2007-12-18
Lu, Caixia (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
C526S134000, C526S161000, C526S165000, C526S319000, C526S335000, C526S943000, C502S103000, C502S152000, C502S155000
Reexamination Certificate
active
10543670
ABSTRACT:
The present invention discloses a metallocene catalyst component of the formula (I) [(Flu-R″-Cp)2M]−[Li(ether)4]+, wherein Cp is a cyclopentadienyl, substituted or unsubstituted, Flu is a fluorenyl, substituted or unsubstitutted, M is a metal Group III of the Periodic Table, and R″ is a structural bridge between Cp and Flu imparting stereorigidity to the component. It further discloses a process for preparing said metallocene catalyst component and its use in controlled polymerisation.
REFERENCES:
patent: 07 258319 (1995-10-01), None
Evans, William J., “Activity of [Sm(C5Me5)3] in Ethylene Polymerization and Synthesis of [U(C5Me5)3), the first tris (pentamethylcyclopentadienyl) 5f-Element Complex” Angewandte Chemie, Intl Edition in English, 36(7), 774-776, 1997.
Qian, Changtao, “Cs-Symmetric ansa-Lanthanocenes Designed for Sterospecific Polymerization of Methyl Methacrylate. Synthesis and Structural Characterization of Silylene-Bridge Fluorenyl Cyclopentadienyl Lanthanide Halides, Amides, and Hydrocarbyls” Organometallics 2000, 19, pp. 4134-4140.
Barbier-Baudry, Denise et al: “Non-hindered ansasamarocenes, versatile catalysts for diene/olefin/polar monomer copolymerizations. What is really the active species?” Journal of Organometallic Chemistry, 647(1-2), 167-179, 2002.
Kirillov, Evgueni et al, “(Cp-CMe2-Flu)2Ln]-Li(ether)n]+(Ln=Y, La): Complexes with Unusual Coordination Modes of the fluorenyl Ligand and the First Examples of Bis-Ansa Lanthanidocenes” ORGANOMETALLICS, 22(20), 403824046, 2003.
Carpentier Jean-Francois
Kirillov Evgueni
Razavi Abbas
Jackson William D.
Kilpatrick-Lee Diane L.
Lu Caixia
Total Petrochemicals Research Feluy
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