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Abstract

A catalyst for olefin polymerization of the formula: R'(C.sub.4 R'.sub.m C.sub.5 C.sub.4 R'.sub.n)XMeQ wherein X is an hetero atom ligand with one or two lone pair electrons selected from the elements of Group VA or VIA which is substituted or non-substituted: (C.sub.4 R.sub.m 'C.sub.5 C.sub.4 R.sub.n ') is a 3,6-substituted fluorenyl; R' is hydrogen or hydrocarbyl radical having 1-20 carbon atoms, a halogen, an alkoxy, an alkoxy alkyl or an alkylamino or alkylsilyo radical, each R' being the same or different and m and n independently are 1, 2, 3 or 4, with bilateral symmetry maintained; R' is a structural bridge between S and (C.sub.4 R'.sub.m C.sub.5 C.sub.4 R'.sub.n) to impart stereorigidity; Q is a hydrocarbyl radical having 1-20 carbon atoms or a halogen; Me is a Group IIIB, IVB, VB, or VIB metal having any of its theoretically possible oxidation states. Olefin monomers polymerised using these catalysts to form syndiotactic/atactic block polymers of high molecular weight and comprising at least 70% of syndiotactic triads.

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