PREPARATION OF ETHYLENE POLYMERIZATION CATALYST Russian patent published in 1997 - IPC

FIELD: catalysts for olefin polymerization processes. SUBSTANCE: invention relates to catalyst for low-pressure polymerization of ethylene. Simplified process and increased catalyst activity are achieved by means of changing reagents and conditions. Catalyst is prepared from magnesium and allyl chloride at molar ratio (1.3-1.9):1 in hydrocarbon medium. Organomagnesium component thus obtained is treated by a certain chlorination agent - ethyl- or diethylaluminum chloride in molar ratio(1-2):1, whereupon vanadium oxychloride is added in carbon tetrachloride solution. Liquid phase is then decanted, catalyst is washed with hexane to yield one containing e.g. 2.5 wt % VOCl₃ on magnesium-containing carrier. The latter e.g. contains (in wt %): 20.1 Mg, 2.9 Al, 74 Cl, and 3 polymer moiety. Catalyst provides productivity with regard to polymer from 2 to 4.7 kg/g catalyst per 1 hour. EFFECT: increased catalyst activity. 2 tbl