Exxonmobil Chemical Patents Inc.

Univation Technologies, LLC

Ramot at Tel-aviv University Ltd.

Exxonmobil Research and Engineering Company

Other

Matthew William Holtcamp

Matthew S Bedoya

Gregory S Day

David F Sanders

John Robert Hagadorn

Laughlin G McCullough

Subramaniam Kuppuswamy

Xuan Ye

Ching-Tai Lue

Charles J Harlan

Garth Ronald Giesbrecht

Donna Jean Crowther

David A Cano

Moshe Kol

Adriana S Silva

Kevin A Stevens

Patrick Brant

Dongming Li

Rohan A Hule

Jian Yang

Konstantin Press

Jo Ann M Canich

Machteld M W Mertens

Lubin Luo

Crisita Carmen H Atienza

Quanchang Li

Charles James Ruff

Renuka N Ganesh

Michelle E Titone

Caol P Huff

Catherine Anne Faler

Antonios K Doufas

David Michael Fiscus

Hasnain Rangwalla

Celestino M Perez, Jr

Ramyaa Mathialagan

Gerardo J Majano Sanchez

Hong Cheng

Glen Barry Brons

David H McConville

Ryan Winston Impelman

Sarah J Mattler

Derek Wade Thurman

Clarence E Chase

Patrick J Palafox

Richard E Pequeno

Joshua P Olson

George Rodriguez

David Charles Calabro

Timothy Marlow Boller

Man Kit Ng

Donald R Loveday

Alexander I Norman

Andrew G Narvaez, Jr

Xiongdong Lian

Meagan E Evans

Eric D Whetmore

Ayellet Stopper

Jihad Mohammed Dakka

James C Vartuli

Machteld Maria Mertens

Gary David Mohr

Tan-Jen Chen

Aspy Keki Mehta

Francis Charles Rix

Mun Fu Tse

Bruce Alan Harrington

Prasadarao Meka

Kevin Bruce Stavens

Jacqueline A Lovell

William Anthony Lamberti

Carlos R Lopez-Barron

Steven D Brown

Joseph Moebus

ManKit Ng

JoAnn M Canich

Steven C Haas

Keith R Green

Luo Lubin

Tan H Pham

Lian Xiongdong

Yang Jian

Robert L Halbach

Ru Xie

Laughlin G Mccullough

Renuka Ganesh

A polyethylene comprising of ethylene derived units and 0.5 wt % to 10 wt % Cto Cα-olefin derived units may be synthesized using a mixed catalyst that comprises rac-dimethylsilylbis(tetrahydroindenyl)zirconium dichloride and a zirconium co-catalyst in a mole ratio of 50:50 to 90:10, and wherein the zirconium co-catalyst is a poor comonomer incorporator as compared to the rac-dimethylsilylbis(tetrahydroindenyl)zirconium dichloride catalyst. Such a polyethylene may have a density of 0.91 g/cmto 0.93 g/cm, an Ivalue of 0.5 g/10 min to 2 g/10 min, an Ivalue of 25 g/10 min to 75 g/10 min, an I/Iratio of 25 to 75, a molar reversed-co-monomer index (RCI,m) of 30 to 180, a phase angle equal or lower than 70° at complex modulus G* of 10,000 Pa, a Θof 1.5 radians to −1.5 radians, and a low density population of 50% and 70% by weight of the polyethylene.

Broad orthogonal distribution polyethylenes for films

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

A process for polymerizing polyethylene is disclosed. The process comprises contacting ethylene and at least one comonomer with a catalyst system to produce a polyolefin. The first catalyst and at least a portion of the second catalyst are co-supported to form a commonly-supported catalyst system. The catalyst system is introduced to a line as a dry-feed. The line is coupled with a polymerization reactor. A carrier fluid is added to the line to form a slurry. The slurry is introduced to the polymerization reactor.

In-line trimming of dry catalyst feed

A polyethylene composition having from about 0.5 to about 20 wt % of alpha-olefin derived units other than ethylene-derived units, with the balance including ethylene-derived units, total internal unsaturations (Vy1+Vy2+T1) of from about 0.15 to about 0.40 per 1000 carbon atoms, an MI of from about 0.1 to about 6 g/10 min, an HLM1 of from about 5.0 to about 40 g/10 min, a density of from about 0.890 to about 0.940 g/ml, a Tw-Twvalue of from about &#x2212;50 to about &#x2212;23&#xb0; C., an Mw/Mwvalue of from about 2.0 to about 3.5, an Mw/Mn of from about 4.5 to about 12, an Mz/Mw of from about 2.5 to about 3.0, an Mz/Mn of from about 15 to about 25, and a g'greater than 0.90.

Polyethylene compositions and films prepared therefrom

This invention relates to a supported catalyst system comprising: (i) at least one first catalyst component comprising a group 4 bis(phenolate) complex; (ii) at least one second catalyst component comprising a 2,6-bis(imino)pyridyl iron complex; (iii) activator; and (iv) support. The catalyst system may be used for preparing polyolefins, such a bimodal polyethylene, typically in a gas phase polymerization.

Supported catalyst systems and processes for use thereof

The present disclosure related to iron-containing compounds including a 2,6-diiminoaryl ligand and one or more substituted hydrocarbyl substituents. Catalysts, catalyst systems, and processes of the present disclosure can provide polyolefins with high or low molecular weight, low comonomer content, narrow polydispersity indices, and broad orthogonal composition distribution. The present disclosure provides new and improved iron-containing catalysts with enhanced solubility in hydrophobic (nonpolar) solvents.

Iron bis(imino) aryl catalysts and methods thereof

A catalyst system including the product of the combination of an unbridged Group 4 metallocene compound and a 2,6-bis(imino)pyridyl iron complex is provided. A process for the polymerization of monomers (such as olefin monomers) and a polymer produced therefrom are also provided.

Catalyst systems and polymerization processes for using the same

This invention relates to a catalyst system including the reaction product of a support (such as a fluorided silica support that preferably has not been calcined at a temperature of 400&#xb0; C. or more), an activator and at least two different transition metal catalyst compounds; methods of making such catalyst systems, polymerization processes using such catalyst systems and polymers made therefrom.

Supported catalyst systems and methods of using same

The present disclosure provides bridged metallocene catalyst compounds comprising &#x2014;Si&#x2014;Si&#x2014; bridges, catalyst systems comprising 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 an Si&#x2014;Si-containing bridge. In another class of embodiments, the present disclosure is directed to polymerization processes to produce polyolefin polymers from catalyst systems comprising one or more olefin polymerization catalysts, at least one activator, and an optional support.

Metallocenes with Si&#x2014;Si bridges

The present disclosure provides bridged metallocene catalyst compounds including at least two &#x2014;Si&#x2014;Si&#x2014; bridges, 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 two Si&#x2014;Si-containing bridges. 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 with two -Si-Si- bridges

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

A polyethylene composition comprising from about 0.5 to about 20 wt % of alpha-olefin derived units other than ethylene-derived units, with the balance including ethylene-derived units, total internal unsaturations (Vy1+Vy2+T1) of from about 0.10 to about 0.40 per 1000 carbon atoms, an MI of from about 0.1 to about 6 g/10 min, an HLMI of from about 5.0 to about 40 g/10 min, a density of from about 0.890 to about 0.940 g/ml, a Tw-Twvalue of from about &#x2212;25 to about &#x2212;20&#xb0; C., an Mw/Mwvalue of from about 1.2 to about 2.0, an Mw/Mn of from about 4.5 to about 12, an Mz/Mw of from about 2.0 to about 3.0, an Mz/Mn of from about 7.0 to about 20, and a g'greater than 0.90.

Growing community of inventors

Huffman, TX, United States of America

Matthew William Holtcamp