Process for the production of elastomeric, primarily isotactic polyolefins and catalysts for use in said process

摘要

A process for the production of elastomeric, primarily isotactic polyolefins which comprises polymerizing olefins in the presence of a catalyst which comprises the reaction product of a magnesium alkoxide and a tetravalent titanium halide wherein the reaction takes place in the presence of an electron donor which is an effectively hindered heterocyclic aromatic nitrogen compound and an organoaluminum compound.