The Dow Chemical Company

E.i. Dupont De Nemours and Company

Donald E Gessell

Kirby Lowery, Jr

Ricardo Fuentes, Jr

Ronald L Gibbs

David M Courter

Gaylon L Dighton

Luis Daniel Valenzuela-Bernal

Olefins are polymerized in the presence of, as a catalyst therefor, the unseparated catalytic reaction product resulting from heating a mixture of

Process for polymerizing olefins in the presence of a catalyst prepared

Catalysts having high efficiency in preparing olefin polymers while controlling molecular weight distribution are disclosed. The catalysts utilize magnesium siloxide supports and the product polymer molecular weight distribution can be controlled by the catalyst preparation.

High efficiency catalysts for varying olefin polymer molecular weight

A method is provided for preparing hydrocarbon soluble magnesium siloxide supports comprising contacting such supports with sufficient aluminum alkoxide or organic ethers to render the supports hydrocarbon soluble. Thereafter the supports are contacted with a transition metal compound and halogenated to obtain polymerization catalysts.

Hydrocarbon soluble catalyst supports and resultant polymerization

A catalyst for polymerizing olefins is the reaction product of (A) the reaction product of (1) the reaction product of (a) an alkyl magnesium compound such as dibutylmagnesium, with (b) an oxygen-containing and/or nitrogen-containing compound such as n-propyl alcohol, or isopropylamine, with (2) a halide source such as titanium tetrachloride or silicon tetrachloride; and (B) a transition metal compound such as titanium tetrachloride and (C) a reducing agent such as triisobutylaluminum. Also disclosed is a non-transition metal containing catalyst support for use in preparing olefin polymerization catalysts. The polymers which are produced in the presence of this catalyst and a cocatalyst such as triethylaluminum have a low catalyst support to transition metal ratio and therefore, the catalyst efficiency based on quantity of polymer per quantity of total catalyst is very high resulting in a polymer having good color and very little, if any, corrosion.

Catalyst prepared from organo-magnesium compound; oxygen- or

A catalyst for polymerizing olefins is the product resulting from heating in an inert hydrocarbon diluent a mixture of (A) an organomagnesium material, (B) an organic hydroxyl-containing material, (C) a reducing halide source and (D) a transition metal compound.

Catalyst prepared from organomagnesium compound, organic

A process for polymerizing olefins employing as a catalyst therefor, the reaction product of (A) the reaction product of (1) the reaction product of (a) an alkyl magnesium compound such as dibutylmagnesium, with (b) an oxygen-containing and/or nitrogen-containing compound such as n-propyl alcohol, or isopropylamine, with (2) a halide source such as titanium tetrachloride or silicon tetrachloride; and (B) a transition metal compound such as titanium tetrachloride and (C) a reducing agent such as triisobutylaluminum. The polymers which are produced in the presence of this catalyst and a cocatalyst such as triethylaluminum have a low catalyst support to transition metal ratio and therefore, the catalyst efficiency based on quantity of polymer per quantity of total catalyst is very high resulting in a polymer having good color and very little, if any, corrosion.

Process for polymerizing olefins employing a catalyst prepared from

An improved process for polymerizing olefins in the presence of a catalyst employing hydrogen for molecular weight control is disclosed wherein the improvement resides in adding additional hydrogen to the polymer slurry produced in the reactor system so as to eliminate or reduce the formation of gels in articles fabricated from the resultant polymer.

Method for reducing gels in polyolefin

Solid supported catalysts which can be employed for the polymerization of .alpha.-olefins are prepared by (A) reacting in the presence of a diluent such as n-hexane a mixture of (1) the reaction product of (a) an organo magnesium compound such as dibutyl magnesium and (b) at least one of water, carbon dioxide or an organic, oxygen-containing compound such as n-propyl alcohol; and (2) a transition metal halide such as titanium tetrachloride and (B) recovering the solid precipitate such as by decanting and (C) washing the solid with a solvent such as n-hexane. The resultant solid supported catalyst contains sufficient transition metal which when activated with a suitable activating agent serves as a polymerization catalyst for .alpha.-olefins. The polymers prepared employing these catalysts have a relatively narrow molecular weight distribution and low residual amounts of transition metal and halides.

High efficiency catalyst for polymerizing olefins

Compositions exhibiting high catalytic activity in the polymerization of .alpha.-olefins are provided by reacting an ester of titanium, a so-called titanate such as tetra(isopropoxy)titanium, an organomagnesium compound or complex such as a hydrocarbon soluble complex of dialkyl magnesium and an alkyl aluminum, e.g., di-n-butylmagnesium.1/6 triethylaluminum and an alkyl aluminum halide. Polymerization processes employing this catalyst composition do not require conventional catalyst removal steps in order to provide polymers having suitable color and other physical characteristics.

High efficiency titanate catalyst for polymerizing olefins

Hydrocarbon-soluble compositions useful as the transition metal component in the Ziegler polymerization of .alpha.-olefins are provided by reacting molecular nitrogen or hydrogen with a transition metal compound such as titanium trichloride to form a dinitrogen or dihydrogen complex of the transition metal compound.

Hydrocarbon soluble catalyst containing dinitrogen or dihydrogen

Compositions exhibiting high catalytic activity in the polymerization of .alpha.-olefins are provided by reacting compound of titanium, e.g., a titanate such as tetra(isopropoxy)titanium, an organomagnesium compound or complex such as a hydrocarbon soluble complex of dialkyl magnesium and an alkyl aluminum, e.g., di-n-butylmagnesium 1/6 triethylaluminum and an alkyl aluminum halide. The organomagnesium component is highly concentrated in hydrocarbon diluent at the time it reacts with the metallic halide. The resulting catalysts when used in slurry polymerization processes produce polyolefin powders having higher bulk densities than those produced using conventional high efficiency catalysts.

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Baton Rouge, LA, United States of America

Donald E Gessell