MAGNESIUM HALIDE SUPPORT FOR TITANIUM HALIDE CATLAYSTS

摘要

A process for preparing an effective support for the titanium halide component of a coordinate complex catalyst for the polymerization of alpha-olefins comprises the steps of: (a) intimately contacting a magnesium or manganese chloride or bromide with a drying agent at an elevated temperature, (b) milling the magnesium or manganese chloride or bromide so as to activate its surface; and (c) repeat contacting step (a) and milling step (b) for two or more cycles, whereby the effective support is produced.