The Dow Chemical Company

Fred L Vance, Jr

Kirby Lowery, Jr

Christopher P Christenson

Randall S Shipley

Wilbur L Bressler

Rafael E Guerra

Alpha-Olefins are polymerized in the presence of a catalyst which comprises (A) the reaction product of (1) a tetrahydrocarbyloxy zirconium compound such as tetraisopropoxy zirconium or a tetravalent hydrocarbyloxy zirconium halide such as triisopropoxy zirconium halide with (2) a chromium compound such as CrO.sub.3 ; (B) a solid catalyst support; (C) an organometallic activating agent or cocatalyst and (D) a trivalent or tetravelent titanium compound. The resultant polymers have a high molecular weight and a narrow molecular weight distribution.

Polymerization of olefins from catalysts prepared from organo

Olefins are polymerized in the presence of chromium-containing catalysts which have been improved by depositing the chromium onto the inorganic oxide support in the vapor phase rather than as an inorganic or organic compound. The resulting polymers exhibit a higher molecular weight as compared to those polymers prepared in the presence of such chromium-containing catalysts prepared in the conventional manner.

Polymerization of olefins in the presence of chromium-containing

Dual transition metal compounds containing zirconium and chromium are prepared by reacting a tetrahydrocarbyloxy zirconium compound such as tetraisopropoxy zirconium or a tetravalent hydrocarbyloxy zirconium halide such as triisopropoxy zirconium halide with a chromium compound such as CrO.sub.3. These compounds, as well as combinations of other soluble chromium and zirconium compounds, are useful in the polymerization of .alpha.-olefins to produce polymers having a high molecular weight and a narrow molecular weight distribution.

Organo zirconium-chromium compound, catalyst prepared therefrom and

Inorganic oxide supported chromium-containing catalysts are improved by depositing the chromium onto the inorganic oxide support in the vapor phase rather than as an inorganic or organic compound. Polymers resulting from polymerizing one or more .alpha.-olefins in the presence of such catalysts exhibit a higher molecular weight as compared to those polymers prepared in the presence of such chromium-containing catalysts prepared in the conventional manner.

Chromium-containing catalysts for polymerizing olefins

Dual transition metal compounds containing titanium and chromium are prepared by reacting a hydrocarbyloxy titanium halide with CrO.sub.3. The compounds are useful in catalysts for the polymerization of .alpha.-olefins.

Organo titanium chromium compound, catalyst prepared therefrom and

A catalyst mixture containing at least two independently supported catalysts, at least one of which is an inorganic halide supported titanium and/or vanadium Ziegler type catalyst and at least one other is an inorganic oxide supported, chromium catalyst. These catalyst mixtures are suitable for polymerizing one or more .alpha.-olefins.

Dual, independently supported catalyst mixtures

Alpha-olefins are polymerized in the presence of at least two independently supported catalysts, one of which is an inorganic halide supported titanium and/or vanadium Ziegler type catalyst and at least one other is inorganic oxide supported, chromium catalyst. This dual catalyst increases catalyst efficiency and/or provides more flexible control of the properties of the resulting polymers.

Polymerization of olefins with dual, independently supported catalysts

.alpha.-olefins are polymerized with a catalyst prepared from (1) an inert support, (2) the reaction product of a tetravalent hydrocarbyloxy titanium halide such as di-n-butoxy titanium dichloride and hexavalent chromium oxide and (3) an organometal activating agent such as a tri alkyl aluminum.

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Lake Jackson, TX, United States of America

Fred L Vance, Jr