Polymerization catalyst

Details Polymerization catalyst Polymerization catalyst

C - Chemistry, Metallurgy

08

F

402/613, 402/636

C08F 4/68 (2006.01) C08F 10/00 (2006.01)

Patent

CA 1207742

ABSTRACT OF THE DISCLOSURE Catalyst compositions which are particularly useful for the preparation of ethylene polymers having a narrow molecular weight distri- bution are obtained by (1) drying an inorganic oxide having surface hy- droxyl groups, e.g., silica, alumina, magnesia, etc., to remove adsorbed water, (2) reacting the surface hydroxyl groups with at least a stoichio- metric amount of an organometallic compound having at least one alkyl group attached to a Group III metal, e.g., a trialkylaluminum, (3) react- ing the thus-treated inorganic oxide with a vanadium halide, such as (a) VOCl3, VOBr3, and/or mono-, di-, and/or trihydrocarbyloxy derivatives thereof and/or (b) VCl4, VBr4, and/or mono-, di-, tri-, and/or tetrahy- drocarbyloxy derivatives thereof, and (4) reacting that reaction product with at least about 0.1 mol, per mol of organometallic compound, of an alcohol containing 1 to 18 carbon atoms.

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