Patent ID: 6248685
Filing Date: 2001-06-19
Classification: C08F,Y10S

Abstract:
A method of making a catalyst suitable for the polymerization of olefins, which method comprisesmixing an ether having a total number of carbon atoms equal to or greater than 8, with hydrated magnesium chloride having a water content of between 0.02 mole of water/1 mole of magnesium chloride and 2 moles of water/1 mole of magnesium chloride, to produce partially activated magnesium chloride;mixing a trialkyl aluminum in liquid form or as a solution in an inert hydrocarbon liquid, with the partially activated magnesium chloride, to form an unwashed activated magnesium chloride slurry;washing the unwashed activated magnesium chloride in the slurry with an inert saturated hydrocarbon liquid, to obtain an activated magnesium chloride-containing slurry;mixing a plurality of alcohols with the activated magnesium chloride-containing slurry to form an activated magnesium chloride/alcohol complex; andmixing titanium tetrachloride with the activated magnesium chloride/alcohol complex, to form a magnesium chloride supported titanium catalyst.