A POLYMERISATION PROCESS

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A polymerisation process for the preparation of vinylic polymers from the corresponding vinylic monomers which process comprises the step of reacting a vinylic monomer in the presence of a catalyst system comprising a) a metal complex of general formula (I) where A is selected from the group consisting of nickel, iron, cobalt, chromium, manganese, titanium, zirconium, vanadium and the rare earth metals; L, L, Land Lare ligands and b) a Lewis acid of general formula (II) wherein at least one of W, Y or Z is capable of forming a co-ordination bond with A and the others of W, Y and Z are bulky groups; D is selected from the group consisting of aluminium, magnesium, zinc and boron.