Patent ID: 6569964
Filing Date: 2003-05-27
Classification: C08F

Abstract:
A process comprising the steps of:(a) preparing a catalyst precursor by reacting a mixture of at least one transition metal compound, at least one electron donor and at least one alkali earth halide or alkali metal halide complex in an effective amount of a hydrocarbon liquid, while heating said mixture over a temperature range of from about 60Â° C. to 75Â° C., refluxing said mixture under an inert atmosphere to form said catalyst precursor; (b) partially activating said catalyst precursor with an effective amount of an alumoxane or a physical mixture comprising an alumoxane and an organoaluminum compound selected from the group consisting of triethyl aluminum, diethyl aluminum chloride, tri-n-hexel aluminum and mixtures thereof; (c) adding a slurry of a support material into the reactor and forming an impregnated, supported, partially activated catalyst precursor; (d) recovering said impregnated, supported, partially activated catalyst precursor; (e) adding said impregnated supported, partially activated catalyst precursor to a polymerization reactor containing a solution comprising a cocatalyst selected from the group consisting of (i) an alumoxane and (ii) a mixture of an alumoxane and an organoaluminum compound selected from the group consisting of trihexyl aluminum, triethyl aluminum, trimethyl aluminum, tri-isobutyl aluminum, diethyl aluminum chloride and mixtures thereof; (f) introducing olefinic monomers into said reactor and polymerizing said monomers over a polymerization temperature range of from about 30Â° C. to about 120Â° C. to form a polymeric product having a single melting point peak; and (g) recovering said polymeric product.