| abstract |
Ethylene polymers are made by bringing ethylene under polymerization conditions at low pressures into contact with a catalyst comprising a titanium halide, a vanadium halide and an organoaluminum compound. Molecular weight distribution of the polymers is controlled by reacting the titanium halide, the vanadium halide and the organoaluminum compound in such proportions that the Al/(Ti+V) ratio is between about 0.1 and 0.5 and admixing the resulting catalyst complex with a mixture of an alkylaluminum sesquiethoxide and a trialkylaluminum prior to contacting of ethylene therewith. |