Silica supported transition metal catalyst (SILICA SUPPORTED TRANSITION METAL CATALYST)

摘要

(A) in an inert atmosphere excluding oxygen and moisture, (1) having a hydroxyl group of 5 millimoles or less per gram of support material, a particle size of less than 10 microns and a surface area of from about 50 to about 800 m2 / g in an inert organic solvent medium Forming a slurry of a porous inorganic oxide support material selected from the group consisting of silica, alumina or a mixture of silica and alumina; (B) mixing the slurry with (2) the alkoxide and stirring the resulting mixture at a temperature of from about-20 C to about 120 C for a time sufficient to saturate the surface of the support material; (C) mixing a product from (B) with (3) a mixture of a titanium compound or a titanium compound and (4) a vanadium compound, and then reacting the titanium compound and the vanadium compound with the residual organomagnesium residue remaining on the solid support RTI ID = 0.0 120 C /RTI ; (D) an inert organic solution of the product from (C) and (5) a Group IIIA metal alkyl halide for a time sufficient to fully reduce the titanium and vanadium (if present) compounds to the final oxidized state at about-20C RTI ID = 0.0 120 C /RTI -Polymers of olefins A useful transition metal containing catalyst is prepared. A high density fraction greater than 17% and an ethylene / -olefin copolymers appear to be useful in producing cast films with good elongation and breakthrough resistance. Copolymers of the present invention with particular properties are particularly useful for making films.