Polymerization catalysts

摘要

Polymerization catalyst preparation comprising milling magnesium metal, an organic halide and titanium tetrahalide in the presence of a triaryl phosphite and an aluminum trihalide but in the absence of a complexing diluent. The titanium catalyst component is activated with an organoaluminum activator producing a catalyst for olefin polymerization. In one embodiment, the titanium catalyst component is milled in the presence of magnesium oxide. In another embodiment, the milled titanium catalyst component is subjected to heat treatment.