Organic compounds -- part of the class 532-570 series – Organic compounds – Heavy metal containing
Reexamination Certificate
2007-12-12
2008-12-23
Gonzalez, Porfirio Nazario (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Heavy metal containing
C556S011000, C556S012000, C526S160000, C526S943000, C502S103000
Reexamination Certificate
active
07468452
ABSTRACT:
The present invention is directed to a method of making a ligand which can be used to form an ansa-metallocene. Further, the present invention is directed to a method of making the ansa-metallocene. In both methods the process steps employed to form the ligand are conducted in the presence of tetrahydrofuran, a substituted tetrahydrofuran, tetrahydropyran, a substituted tetrahydropyran or ethylene glycol dimethyl ether.
REFERENCES:
patent: 5416228 (1995-05-01), Ewen et al.
patent: 5449651 (1995-09-01), Reddy et al.
patent: 2007/0179044 (2007-08-01), Yang et al.
patent: 2007/0197374 (2007-08-01), Yang et al.
Kaminsky et al., Journal of Organometallics, vol. 684, pp. 200-205 (2003).
Alt, Helmut G., et al., C1-Bridged fluorenylidene cyclopentadienylidene complexes of the type (C13H8-CR1R2-C5H3R)ZrCl2(R1, R2=alkyl, phenyl, alkenyl; R=H, alkyl, alkenyl, substituted silyl) as catalyst precursors for the polymerization of ethylene and propylene,Journal of Organometallic Chemistry, 568, 1998, 87-112.
Miller, Stephen A., et al., Highly Stereoregular Syndiotactic Polypropylene Formation with Metallocene Catalysts via Influence of Distal Ligand Substituents,Organometallics, 2004, 23, 1777-1789.
Martin Joel L.
Masino Albert P.
Yang Qing
Chevron Phillips Chemical Company LP
Gonzalez Porfirio Nazario
Merchant & Gould P.C.
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