| abstract |
A process and a catalyst for the production of elastomeric, primarily stereoregular poly-α-olefin characterized by a relatively narrow distribution of relatively short block lengths, which comprise the polymerization of α-olefin of at least 3 carbon atoms in the presence of a catalyst which comprises the reaction product of a magnesium oxy compound and a tetravalent titanium halide in the presence of an electron donor, an organoaluminum compound and a selectivity control agent which is an aromatic heterocyclic nitrogen compound. |