Amidinato catalyst systems for the polymerization of olefins

Abstract

Catalyst systems which are suitable for the polymerization of olefinically unsaturated hydrocarbons contain, as active components, A) an amidinato metal complex of the formula A ##STR1## where M is a metal from group IIIb, IVb, Vb or VIb of the Periodic Table of Elements or a metal from the lanthanide group, X is a negative leaving atom or a negative leaving group, and the radicals X may be identical or different if (n-m)>1, R.sup.1, R.sup.2 and R.sup.3 are each a C-organic or Si-organic radical, n is the valency of M in the metal complex A and m is from 1 to 5, with the proviso that n-m.gtoreq.0, and, B) an activator in a molar ratio of activator B to metal complex A of from 0.5:1 to 10,000:1.

Dependencies are inferred from the claim text.