Process for producing ethylene polymers having reduced hexane extractable content
AssigneeUnion Carbide Chemicals & Plastics Technology Corporation
InventorsRobert J. Jorgensen, Elton D. Fowler, George L. Goeke
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Abstract
A catalyst system of the Ziegler-Natta type suitable for producing ethylene copolymers having a reduced hexane extractable content comprising (a) an organoaluminum component and (b) a titanium trichloride component which has been prepared by reducing titanium tetrachloride with magnesium metal.
Claims26
A catalyst system comprising
- (a) an organoaluminum component, and
- (b) a titanium trichloride component prepared by (i) reducing titanium tetrachloride with magnesium metal by treating titanium tetrachloride in an electron donor solvent with a stoichiometric amount of magnesium metal required to reduce said titanium tetrachloride to titanium trichloride and produce magnesium dichloride, said electron donor solvent being free of radicals containing active hydrogen;
- (ii) adding additional magnesium dichloride to the resulting solution to increase the Mg/Ti ratio to a range of from 1:1 to 56:1;
- and then (iii) impregnating said solution in a suitable support or, alternatively, spray drying the solution with or without a suitable filler, to obtain discrete particles of catalyst.
A process for producing a titanium trichloride composition suitable for use as a component of a Ziegler-Natta catalyst system which comprises (i) reducing titanium tetrachloride to titanium trichloride by treating titanium tetrachloride in an electron donor solvent with a stoichiometric amount of magnesium metal required to reduce said titanium tetrachloride to titanium trichloride and produce magnesium dichloride;
- (ii) adding additional magnesium dichloride to the resulting solution to increase the Mg/Ti ratio to a range of from 1:1 to 56:1;
- and then (iii) impregnating said solution in a suitable support or, alternatively, spray drying the solution with or without a suitable filler, to obtain discrete particles of catalyst.
Dependencies are inferred from the claim text.