Mobil Oil Corporation

Univation Technologies, LLC

Exxonmobil Oil Corporation

Exxonmobil Chemical Patents Inc.

Bp Chemicals Limited

Mobil Corporation

Robert I Mink

Thomas E Nowlin

Yury V Kissin

Pradeep P Shirodkar

Sandra Denise Schregenberger

Grace O Tsien

Gary Michael Diamond

Kenneth George Schurzky

Robert O Hagerty

Chunming Wang

Per K Husby

Hitesh A Fruitwala

Shih-May Christine Ong

David Bruce Barry

Robert Lynn Santana

Vaseem Firdaus

Ahmed H Ali

Vincent Joseph Crotty

Keith Dackson

David B Barry

Brian J Egan

Yuri V Kissin

David John Ashton

Frederick Yip-Kwai Lo

Lawrence T Kale

Tomas A Geoghegan

James F Lottes

Jill Helaine Paul

A J Brandolini

Bimetallic catalyst for producing polyethylene resins with a bimodal molecular weight distribution, its preparation and use. The catalyst is obtainable by a process which includes contacting a support material with an organomagnesium component and carbonyl-containing component. The support material so treated is contacted with a non-metallocene transition metal component to obtain a catalyst intermediate, the latter being contacted with an aluminoxane component and a metallocene component, This catalyst may be further activated with, e.g., alkylaluminum cocatalyst, and contacted, under polymerization conditions, with ethylene and optionally one or more comonomers, to produce ethylene homo- or copolymers with a bimodal molecular weight distribution and improved resin swell properties in a single reactor. These ethylene polymers are particularly suitable for blow molding applications.

Bimetallic catalyst for producing polyethylene resins with bimodal molecular weight distribution, its preparation and use

An ethylene/&#x3b1;-olefin copolymer comprising a component produced by a non-single-site polymerization catalyst and a component produced by a single-site polymerization catalyst, its preparation and use are described. The copolymer has an &#x3b1;-olefin content of 5 to 20 percent by weight and shows at least two CRYSTAF peak temperatures differing by at least 15&#xb0; C. and/or at least two DSC melting peak temperatures differing by at least 15&#xb0; C.

Ethylene/&#x3b1;-olefin copolymer made with a non-single-site/single-site catalyst combination, its preparation and use

Methods of preparing bimetallic catalysts are disclosed. The methods include the steps of providing a supported non-metallocene catalyst, contacting a slurry of the supported non-metallocene catalyst in a non-polar hydrocarbon with a solution of a metallocene compound and an alumoxane, and drying the contact product to obtain a supported bimetallic catalyst. The supported non-metallocene catalyst is prepared by dehydrating a particulate support material at a temperature of greater than 600&#xb0; C., preparing a slurry of the dehydrated support in a non-polar hydrocarbon, contacting the slurry with an organomagnesium compound and an alcohol, contacting the resulting slurry with a non-metallocene compound of a Group 4 or Group 5 transition metal, and drying the contact product to obtain a supported non-metallocene catalyst as a free-flowing powder. The bimetallic catalysts show increased activity relative to catalysts prepared using support materials dehydrated at lower temperatures.

Method of making a bimetallic catalyst with higher activity

Bimetallic catalyst for producing polyethylene resins with a bimodal molecular weight distribution, its preparation and use. The catalyst is obtainable by a process which includes contacting a support material with an organomagnesium component and carbonyl-containing component. The support material so treated is contacted with a non-metallocene transition metal component to obtain a catalyst intermediate, the latter being contacted with an aluminoxane component and a metallocene component. This catalyst may be further activated with, e.g., alkylaluminum cocatalyst, and contacted, under polymerization conditions, with ethylene and optionally one or more comonomers, to produce ethylene homo- or copolymers with a bimodal molecular weight distribution and improved resin swell properties in a single reactor. These ethylene polymers are particularly suitable for blow molding applications.

The invention relates to a process for uniformly dispersing a transition metal metallocene complex on a carrier comprising

Bimetallic catalyst for ethylene polymerization reactions with uniform component distribution

A process of forming a bimetallic catalyst composition comprising a cocatalyst (a trialkylaluminum compound) and a catalyst precursor. The precursor comprises at least two transition metals; a metallocene complex is a source of one of said two transition metals. The precursor is produced in a single-pot process by contacting a porous carrier, in sequence, with a dialkylmagnesium compound, an aliphatic alcohol, a non-metallocene transition metal compound, a contact product of a metallocene complex and a trialkyl-aluminum compound, and methylalumoxane.

One pot preparation of bimetallic catalysts for ethylene 1-olefin copolymerization

The present invention provides cocatalysts for activating metallocene complexes in olefin polymerization reactions, and metallocene catalyst systems using the cocatalysts. The cocatalysts of the present invention include: (a) a halo-organoaluminum compound of the formula Al R X , where Al is aluminum, each R is independently a C to C alkyl group, X is a halide, n is 1 or 2, and m is determined by the valency of Al; and (b) a dialkylmagnesium compound of the formula MgR&prime; , where Mg is magnesium and R&prime; is a C to C alkyl group. The components (a) and (b) are used in amounts such that the molar ratio of Al:Mg is at least 2, preferably from 2:1 to 5:1.

Co-catalysts for metallocene complexes in olefin polymerization reactions

A catalyst composition for the polymerization of one or more 1-olefins (e.g., ethylene) comprises a transition metal catalyst precursor and a cocatalyst, the transition metal catalyst precursor comprising a contact product of an unsubstituted metallocene compound and an aluminum alkyl compound in a hydrocarbon solvent solution. In another embodiment, the transition metal catalyst precursor is bimetallic and contains a non-metallocene transition metal catalyst component. When a bimetallic catalyst precursor is used, the resin product exhibits improved properties, and has a bimodal molecular weight distribution, long chain branching (LCB), and good bubble stability.

Metallocene catalyst compositions, processes for making polyolefin resins using such catalyst compositions, and products produced thereby

A process of forming a bimetallic catalyst composition comprising a cocatalyst (a trialkylaluminum compound) and a catalyst precursor. The precursor comprises at least two transition metals; a metallocene complex is a source of one of said two transition metals. The precursor is produced in a single-pot process by contacting a porous carrier, in sequence, with a dialkylmagnesium compound, an aliphatic alcohol, a non-metallocene transition metal compound, a contact product of a metallocene complex and a trialkylaluminum compound, and methylalumoxane.

Premium pipe resins

An ethylene-alpha-olefin copolymerization catalyst is prepared by impregnating a silica calcined at elevated temperature sequentially with an organomagnesium compound such as dialkylmagnesium compound, a silane compound which is free of hydroxyl groups, such as tetraethyl orthosilicate. A transition metal component such as titanium tetrachloride is then incorporated into the support. Unexpectedly, the calcination temperature of the silica used to prepare the catalyst precursors has a strong influence on polymer product properties. By increasing the calcination temperature of the silica from 600&deg; to 700&deg; C. or higher temperatures, a catalyst precursor when activated produced ethylene/1-hexene copolymers with narrower molecular weight distributions (MWD) as manifested by a decrease of resin MFR values of &tilde;3-4 units. Activation of this catalyst precursor with a trialkylaluminum compound results in a catalyst system which is effective for the production of ethylene copolymers.

High activity catalyst prepared with alkoxysilanes

The supported catalyst disclosed herein is a contact product of two components. One component is the contact product of silica containing hydroxyl groups and alumoxane. This second component is the paraffinic-hydrocarbon soluble contact product of a metallocene compound of a transition metal and a trialkylaluminum compound.

Preparation of supported catalyst using trialkylaluminum-metallocene

The present invention relates to a high activity catalyst composition for the (co-)polymerisation of ethylene, optionally with an alpha olefin of 3 to 10 carbon atoms, comprising a catalyst precursor and an organoaluminium cocatalyst, wherein the catalyst precursor consists of:

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Warren, NJ, United States of America

Robert I Mink