PROCESS FOR THE MANUFACTURE OF A CATALYST

摘要

Process for the manufacture of a catalyst A catalyst of high activity and stereospecificity in .alpha.-olefin polymerization is obtained by subjecting titanium Trichloride, obtained by reduction of titanium tetrachloride with aluminum alkyl halides, to two thermal treatments, the second thermal treatment being carried out in the presence of a dialkyl ether and optionally of a cyclopolyene, and optionally subjecting the treated product to an after-treat-ment with an aluminum alkyl halide, optionally in the presence of a small amount of a cyclopolyene and/or an olefin.