Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Reexamination Certificate
2005-05-17
2005-05-17
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...
C526S160000, C526S161000, C526S172000, C526S351000
Reexamination Certificate
active
06894132
ABSTRACT:
Provided is a catalyst for the polymerization of olefins of general formula:in-line-formulae description="In-line Formulae" end="lead"?R″(C4R′mC5C4R′n)XMeQin-line-formulae description="In-line Formulae" end="tail"?wherein X is an hetero-atom ligand with one or two lone pair electrons selected from the elements of Group VA or VIA which can be substituted or non-substituted: (C4Rm′C5C4Rn′) is a symmetrically substituted, 3,6-substituted fluorenyl; R′ is hydrogen or hydrocarbyl radical having from 1-20 carbon atoms, a halogen, an alkoxy, an alkoxy alkyl or an alkylamino or alkylsilylo radical, each R′ may be the same or different and m and n independently are 1, 2 3 or 4, with the proviso that the bilateral symmetry is maintained; R″ is a structural bridge between X and the (C4R′mC5C4R′n) ring to impart stereorigidity; Q is a hydrocarbyl radical having 1-20 carbon atoms or is a halogen; Me is a Group IIIB, IVB, VB, or VIB metal as positioned in the Periodic Table of Elements; and Me can be in any of its theoretically possible oxidation states.Also provided are olefin monomers (particularly propylene) polymerized using these catalysts to form syndiotactic/atactic block polymers of high molecular weight and comprising at least 70% of syndiotactic triads.
REFERENCES:
patent: 3258455 (1966-06-01), Natta et al.
patent: 3305538 (1967-02-01), Natta et al.
patent: 4404344 (1983-09-01), Sinn et al.
patent: 4767735 (1988-08-01), Ewen et al.
patent: 4892851 (1990-01-01), Ewen et al.
patent: 5270410 (1993-12-01), Job
patent: 5459117 (1995-10-01), Ewen
patent: 6407273 (2002-06-01), Razavi et al.
patent: 0226463 (1987-06-01), None
patent: 0277003 (1988-08-01), None
patent: 0277004 (1988-08-01), None
patent: 0310734 (1989-04-01), None
patent: 0628577 (1994-12-01), None
patent: WO 9319103 (1993-09-01), None
patent: WO 9600734 (1996-01-01), None
Llinas et al., Crystalline-Amorphous Block Polypropylene and Nonsymmetric arisa-Metallocene Catalyzed Polymerization, Macromolecules 1992, vol. 25, pp. 1242-1253.
Atofina Research S.A.
Jackson William D.
Lu Caixia
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