Exxonmobil Chemical Patents Inc.

Exxonmobil Research and Engineering Company

Charles J Harlan

Matthew William Holtcamp

Matthew S Bedoya

Xuan Ye

David F Sanders

Subramaniam Kuppuswamy

Adriana S Silva

Quanchang Li

Kevin A Stevens

John Robert Hagadorn

Jo Ann M Canich

Ching-Tai Lue

Chi-I Kuo

Lubin Luo

Ryan Winston Impelman

Machteld M W Mertens

Richard E Pequeno

Francis Charles Rix

Laughlin G McCullough

Dongming Li

Richard B Pannell

Joshua P Olson

Steven C Haas

Peijun Jiang

Machteld Maria Mertens

Bruce Jon Savatsky

George Rodriguez

Catherine Anne Faler

David Charles Calabro

Michael F McDonald, Jr

Rohan A Hule

William Anthony Lamberti

Florin Barsan

Aaron Sattler

Michelle E Titone

Anupriya Jain

Hasnain Rangwalla

Nikola S Lambic

Gerardo J Majano Sanchez

Danica L Nguyen

Kevin M Ferreira

Valerie H Markham

Aakriti Jain

Micah A McClure

Justin A Federici

Michael E Titone

The present disclosure provides metallocene catalyst compounds including at least one —Si— containing linker, catalyst systems including such compounds, and uses thereof. Catalyst compounds of the present disclosure can be hafnium-containing compounds having one or more cyclopentadiene ligand(s) substituted with one or more silyl neopentyl groups and linked with at least one —Si-containing linker. In another class of embodiments, the present disclosure is directed to polymerization processes to produce polyolefin polymers from catalyst systems including one or more olefin polymerization catalysts, at least one activator, and an optional support.

Metallocenes and methods thereof

In an embodiment, a method for producing a polyolefin includes contacting a first composition and a second composition in in a line to form a third composition, wherein: the first composition comprises a contact product of a first catalyst, a second catalyst, a support, a first activator, and a diluent, wherein the mol ratio of second catalyst to first catalyst is from 60:40 to 40:60, the second composition comprises a contact product of the third catalyst, a second activator, and a second diluent, and the third composition comprises a mol ratio of the third catalyst to the second catalyst to the first catalyst of from 10:35:55 to 60:15:25, such as 30:20:30; introducing the third composition from the line into a gas-phase fluidized bed reactor; exposing the third composition to polymerization conditions; and obtaining a polyolefin.

On-line adjustment of catalysts by trim and olefin polymerization

In an embodiment, a method for producing a polyolefin is provided. The method includes: contacting a first composition and a second composition in a line to form a third composition, wherein: the first composition comprises a contact product of a first catalyst, a second catalyst, a support, and a diluent, wherein the mol ratio of second catalyst to first catalyst is from 60:40 to 40:60, the second composition comprises a contact product of the second catalyst and a second diluent; introducing the third composition from the line into a gas-phase fluidized bed reactor; exposing the third composition to polymerization conditions; and obtaining a polyolefin.

On-line adjustment of mixed catalyst ratio by trim and olefin polymerization with the same

It has become desirable to limit or exclude aromatic solvents, such as toluene, from polymerization reactions. For polymerization reactions employing a non-metallocene transition metal complex as a precursor to a polymerization catalyst, exclusion of aromatic solvents may be difficult due to the limited solubility of such complexes in aliphatic hydrocarbon solvents. Aliphatic hydrocarbon solutions suitable for conducting olefin polymerization reactions, particularly solution polymerization reactions, may comprise: a non-metallocene transition metal complex dissolved in an aliphatic hydrocarbon solvent at a concentration ranging from about 2 mM to about 20 mM at 25&#xb0; C. in the presence of an organoaluminum compound. A molar ratio of aluminum of the organoaluminum compound to transition metal of the transition metal complex is about 1:1 or greater, and the organoaluminum compound comprises at least about 8 carbons per aluminum.

Solubility improvement of non-metallocene transition metal complexes in aliphatic hydrocarbon solvents

Provided herein are methods and systems for at least partially deactivating at least one component of a reactor effluent from gas phase polyolefin polymerization processes utilizing at least one glycol.

Deactivation methods for active components from gas phase polyolefin polymerization processes

A process to synthesize a Group 4 ansa-metallocene. The process includes reacting an alkaline earth metal dianion dicyclopentadiene ligand-Lewis base complex with a Group 4 metal tetrahalide in the presence of an alkali metal halide, and forming the Group 4 ansa-metallocene dihalide with high yield and purity.

Metallocene synthesis process

This invention relates to supported catalyst compositions of transition metal complexes of a dianionic, tridentate ligand that features a central neutral heterocyclic Lewis base and two phenolate donors, where the tridentate ligand coordinates to the metal center to form two eight-membered rings. Preferably the bis(phenolate) complexes are represented by Formula (I): where M, L, X, m, n, E, E', Q, R, R, R, R, R, R, R, R, A, A, AA, and AAare as defined herein, where AQAare part of a heterocyclic Lewis base containing 4 to 40 non-hydrogen atoms that links Ato Avia a 3-atom bridge with Q being the central atom of the 3-atom bridge.

Supported transition metal bis(phenolate) complexes and their use as catalysts for olefin polymerization

This invention relates to metallocene compounds represented by the formula: catalyst systems comprising said metallocene compound and an activator or a reaction product of the metallocene compound with the at least one activator, and polymerization processes using such metallocene compounds and activators, where Cpand Cpare optionally-substituted cyclopentadienyl rings; A is bridging group; q is zero or 1; Q is O, O(CRR), (CRR)O, or (CRR); m is 0 to 18; Z is (CRR); LA is a Lewis acid; M is a transition metal; Xand Xare independently Ror OR; Rand Rare independently selected from optionally-substituted hydrocarbyl groups; Rand Rare independently selected from the group consisting of H, halogen, and an optionally-substituted hydrocarbyl group; and Ris alkyl, aryl, perfluoroalkyl, or perfluoroaryl.

Metallocene compounds having appended Lewis acids and polymerization therewith

The present disclosure provides a method for preparing a catalyst system comprising contacting in an aliphatic solvent at a temperature of from less than 0&#xb0; C. to &#x2212;60&#xb0; C. at least one support material having absorbed water and at least one hydrocarbyl aluminum compound to form a supported alumoxane (catalyst precursor) and contacting the supported alumoxane with at least one catalyst compound having a Group 3 through Group 12 metal atom or lanthanide metal atom. The supported alumoxane may be heated prior to contact with the catalyst compound.

Toluene free silica supported single-site metallocene catalysts from in-situ supported MAO formation in aliphatic solvents

A process including contacting one or more monomers, at least one catalyst system, and a condensing agent including &#x2265;10 mol % tetramethylsilane under polymerizable conditions to produce a polyolefin polymer is provided.

Polymerization process

A method for making a polymer, having the steps of (a) polymerizing one or more monomers in the presence of a solvent and a catalyst to form a reaction product; (b) removing an effluent from the reaction product, where the effluent comprises an active catalyst and one or more unreacted monomers; (c) combining a quench, comprising carbon dioxide, with the effluent to form a quenched polymer stream, having a carboxyl metal complex; and (d) recovering a polymer from the quenched polymer stream.

Carbon dioxide as a catalyst quench agent in solution polymerization, and products made therefrom

The present disclosure provides methods for preparing a catalyst system comprising contacting in an aliphatic solvent at least one support material, at least one hydrocarbyl aluminum compound and at least one non-hydrolytic active oxygen-containing compound to form a supported alumoxane (catalyst system precursor) and contacting the supported alumoxane with at least one catalyst compound having a Group 3 through Group 12 metal atom or lanthanide metal atom. The supported alumoxane may be heated prior to contact with the catalyst compound.

Toluene free silica supported single-site metallocene catalysts from in-situ supported alumoxane formation in aliphatic solvents

Catalyst systems including a catalyst compound having a Group 3 through Group 12 metal atom or lanthanide metal atom, an activator, and a support material composition, are provided. The support material composition may have a volume percent of pores with a pore size of from 300 angstroms to 1500 angstroms of 10 vol % to 80 vol %. Processes for producing a polyolefin composition utilizing such catalyst systems are also provided.

Catalyst systems and polymerization processes for using the same

Polyethylene compositions including at least 65 wt % ethylene derived units and from 0 to 35 wt % of C-Colefin comonomer derived units, based upon the total weight of the polyethylene composition are provided. The polyethylene compositions have a) an RCI,m of 100 kg/mol or greater and one or both of: b) a Tw-Twvalue of from &#x2212;16 to &#x2212;38&#xb0; C.; and c) an Mw/Mwvalue of at least 0.9. The polyethylene compositions may be used to manufacture articles such as films.

Polyethylene compositions and articles made therefrom

Growing community of inventors

Houston, TX, United States of America

Charles J Harlan