Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Reexamination Certificate
2007-07-31
2007-07-31
Wu, David W. (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
C526S160000, C526S170000, C526S351000, C526S352000, C526S943000, C556S011000, C556S012000, C556S043000, C556S053000, C556S058000, C502S103000, C502S117000
Reexamination Certificate
active
10529248
ABSTRACT:
The present invention refers to a metallocene catalyst component for producing polyolefins according to formula (I) R″s(CpRn)g(CpRn) M Q3-g(I) or according to formula (II) R″(CpRn)MeXQ (II) wherein—each Cp is a substituted or unsubstituted cyclopentadienyl ring with the bridge-head position of at least one of the cyclopentadienyl rings being occupied by a silicon atom;—each R is the same or different and is hydrogen or a hydrocarbyl radical such as alkyl, alkenyl, aryl, alkylaryl or arylalkyl radical containing from 1 to 20 carbon atoms or two carbon atoms are joined together to form a C4-C6 ring; —R″ is a structural bridge between two Cp rings;—M is a group IIIB, IVB, VB or VIB metal;—Q is a hydrocarbyl radical such as aryl, alkyl, alkenyl, alkylaryl or arylalkyl radical having from 1 to 20 carbon atoms, a hydrocarboxy radical having from 1 to 20 carbon atoms or a halogen and can be the same or different from each other;—s is 0 or 1, g is 0, 1 or 2 and s is 0 when g is 0, n is 4 when s is 1 and n is 5 when s is 0, —X is an hetero atom ligand with one or two lone pair electrons and selected from the group VA or VIA, substituted or unsubstituted. Said metallocene catalyst component is used in a catalyst system for preparing polyolefins with desired properties.
REFERENCES:
patent: 4892851 (1990-01-01), Ewen et al.
patent: 5719241 (1998-02-01), Razavi et al.
patent: 6114481 (2000-09-01), McMeeking et al.
patent: 6448349 (2002-09-01), Razavi
patent: 6608224 (2003-08-01), Resconi et al.
patent: 6630550 (2003-10-01), Razavi
patent: 6855782 (2005-02-01), Shamshoum et al.
patent: 0 277 004 (1988-08-01), None
patent: 0 426 643 (1991-05-01), None
patent: 0 427 696 (1991-05-01), None
patent: 8-245715 (1996-09-01), None
patent: WO 91/03500 (1991-03-01), None
patent: WO 98/02469 (1998-01-01), None
JP 8-245715 (abstract and translation in English).
Dysard et al., J. Am. Chem. Soc. 200, 122, 3097-3105.
Dysard et al., Synthesis and Reactivity of n5-Silolyl, n5-Germolyl, and n5-Germole Dianion Complexes of Zirconium and Hafnium, Journal of the American (cont'd) Chemical Society, 2000, pp. 3097-3105, vol. 122, American Chemical Society, published on internet Mar. 18, 2000.
Watanabi et al., Reaction of Trimethylaluminum with [(tBu)AI(u3-O)]6: Hybrid tert-Butylmethylalumoxanes as Cocatalysts for Olefin Polymerization, (cont'd) Organometallics, 2001, pp. 460-467, vol. 20, American Chemical Society, published on internet Jan. 5, 2001.
Dysard et al., n5-Silolyl and n5-Germolyl Complexes of d0 Hafnium, Structural Characterization of an n5-Silolyl Complex, Journal of the American Chemical (cont'd) Society, 1998, pp. 8545-8246, vol. 120, American Chemical Society, published on internet Jul. 31, 1998.
Liu et al., Structure and Chemistry of 1-Silafluorenyl Dianion, Its Derivatives, and an Organosilicon Diradical Dianion, Journal of the American Chemical Society, (cont'd) 2002, pp. 49-57, vol. 124, No. 1, American Chemical Society, published on internet Dec. 6, 2001.
Francis, et al., “Hydroalumination of H2C=CHCH2SMe: Synthesis and Molecular Structure of (tBu)2AI(CH2CH2CH2Sme),” Main Group (cont'd) Chemistry, 1999, vol. 3, pp. 53-57, Overseas Publishers Association, Malaysia.
Francis, et al., “Are intramolecularly stabilized compounds of aluminum suitable structural models of the SN2 transition state? Molecular structure (cont'd) of [(tBu)2AI(u-OC6H4-2-OMe)]2,” Polyhedron, vol. 18, pp. 2211-2218, Elsevier Science Ltd.
Jackson William D.
Lee Rip A.
TOTAL Petrochemicals Research Feluy
Wu David W.
LandOfFree
Silicon containing cyclopentadienyl ring for metallocene... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Silicon containing cyclopentadienyl ring for metallocene..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Silicon containing cyclopentadienyl ring for metallocene... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3756582