C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
C08F 4/64 (2006.01) C08F 4/60 (2006.01) C08F 10/00 (2006.01) C08F 10/06 (2006.01)
Patent
CA 2518358
Metallocene catalysts useful for the preparation of syndiotactic/atactic block polyolefins have the general formula R" (C4R'm C5C4R'n)XmeQ wherein X is a 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; (C4R'm C5C4R'n) is a fluorenyl or a symmetrically substituted fluorenyl or cyclopentadienyl ring; 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 0, 1, 2, 3 or 4, with the proviso that the bilaterally symmetry is maintained; R" is a structural bridge between X and the (C4R'm C5C4R'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. Olefin monomers (particularly propylene) polymerized using those catalysts to form syndiotactic/atactic block polymers of high molecular weight and comprising at least 70% of syndiotactic triads.
Fina Research S.a.
Gowling Lafleur Henderson Llp
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