Abstract: Catalysts effective for the polymerization of olefins at high productivity formed upon mixing (1) a solution of a titanium tetrahydrocarbyloxide or a zirconium tetrahydrocarbyloxide and an organoaluminum halide with (2) a dihydrocarbylmagnesium compound alone or admixed with a minor amount of a trialkylaluminum and (3) combining the product obtained in (2) with a metal halide selected from a silicon tetrahalide and a titanium tetrahalide. The catalyst component thus produced can be combined with an organoaluminum compound as a cocatalyst component.

Abstract: A silica base for a chromium olefin polymerization catalyst is subjected to a high temperature treatment as for instance by passing the silica through a flame in order to alter the surface characteristics. The chromium can be present during the flame treatment or added later. The result is a catalyst capable of giving a broader molecular weight distribution polymer which is of particular value with the silica-titania coprecipitated catalyst used in slurry olefin polymerization.

Abstract: Catalysts effective for the polymerization of olefins at high productivity formed upon mixing (1) a solution of titanium tetrahydrocarbyloxide or a zirconium tetrahydrocarbyloxide and an organoaluminum halide with (2) a dihydrocarbylmagnesium compound alone or admixed with a minor amount of a trialkylaluminum and (3) combining the product obtained in (2) with a metal halide selected from a silicon tetrahalide and a titanium tetrahalide. The catalyst component thus produced can be combined with an organoaluminum compound as a cocatalyst component.

Abstract: A transition metal compound and a metal halide compound are chemically combined to form a composition of matter. The composition of matter is rapidly mixed with a precipitating agent to form an active olefin polymerization catalyst.

Abstract: Polymerization of alpha-monoolefins employing a catalyst comprising (A) a milled admixture of a titanium halide, anhydrous magnesium or manganous chloride, optionally a Lewis base, and (B) a dihydrocarbylaluminum halide, a dihydrocarbylaluminum hydride, and an ether-alcohol.

Abstract: A silica base for a chromium olefin polymerization catalyst is subjected to a high temperature treatment as for instance by passing the silica through a flame in order to alter the surface characteristics. The chromium can be present during the flame treatment or added later. The result is a catalyst capable of giving a broader molecular weight distribution polymer which is of particular value with the silica-titania coprecipitated catalyst used in slurry olefin polymerization.

Abstract: Polymerization of alpha-monoolefins employing a catalyst comprising (A) a milled admixture of a titanium halide, anhydrous magnesium or manganous chloride, optionally a Lewis base, and (B) a dihydrocarbylaluminum halide, a dihydrocarbylaluminum hydride, and an ether-alcohol.

Abstract: A transition metal compound and a metal halide compound are chemically combined to form a composition of matter. The composition of matter is rapidly mixed with a precipitating agent to form an active olefin polymerization catalyst under an olefin atmosphere and prepolymer is formed on said catalyst to yield a catalyst capable of producing low fines content polymer.

Abstract: Polymerization of alpha monoolefins employing a catalyst comprising (A) a component formed by intensive mixing (milling) of titanium halide, a Lewis base, anhydrous magnesium or manganese chloride, and an unsaturated additive, (B) trihydrocarbylaluminum and, optionally, a Lewis base, and optionally (C) a dihydrocarbylaluminum halide.

Abstract: Polymerization of alpha monoolefins employing a catalyst comprising (A) a component formed by intensive mixing (milling) of titanium halide, a Lewis base, anhydrous magnesium or manganese chloride, and an unsaturated additive, (B) trihydrocarbylaluminum and, optionally, a Lewis base, and optionally (C) a dihydrocarbyl aluminum halide.

Abstract: A catalyst for producing polymers of ethylene in which a first composition prepared by reacting an inorganic support containing surface hydroxyl groups with titanium or vanadium compounds which also comprise halogen and/or OR groups wherein R is hydrocarbyl is further reacted to form a second composition by subsequent contact with a compound of titanium or vanadium as defined above chosen from compounds of the metal not reacted to form the first composition, producing a third composition by reaction of the second composition with an organoaluminum compound with the third composition being reacted with titanium tetrahalide to form the catalyst composite. A method for producing polymers of ethylene by contacting ethylene monomer in the presence of the catalyst composite described above and an organoaluminum compound under conditions suitable for polymerization.

Abstract: Aliphatic monoolefins are polymerized employing a catalyst consisting of a first component formed by co-comminuting a mixture of a halogenated titanium compound, a magnesium or manganese dihalide, a Lewis base, and an aromatic compound which is normally liquid at about 25.degree. C; a second component consisting of a trialkylaluminum compound and a Lewis base; and, optionally, third component which is a dialkylaluminum halide.