Polymerisation catalyst.

摘要

A polymerisation catalyst comprises (A) the reaction product of a magnesium salt of a carboxylic acid which comprises an aromatic or heterocyclic ring, a transition metal of group IVA, VA or VIA of the periodic table and an ester of an aromatic carboxylic acid, (B) an organic compound of aluminium and/or of a metal of group IIA of the periodic table and (C) a Lewis base which contains a SiOR, SiOCOR or SiNR bond.