Exxonmobil Chemical Patents Inc.

Other

Exxonmobil Research and Engineering Company

David F Sanders

Matthew William Holtcamp

Matthew S Bedoya

Xuan Ye

Laughlin G McCullough

Gregory S Day

Ching-Tai Lue

Adriana S Silva

Dongming Li

Subramaniam Kuppuswamy

Charles J Harlan

Kevin A Stevens

Rohan A Hule

Antonios K Doufas

Crisita Carmen H Atienza

Ryan Winston Impelman

Derek Wade Thurman

Michelle E Titone

Joshua P Olson

John Robert Hagadorn

Jo Ann M Canich

Bruce Jon Savatsky

David A Cano

Sarah J Mattler

Alexander I Norman

Richard E Pequeno

Hasnain Rangwalla

Francis Charles Rix

David Charles Calabro

Lubin Luo

Quanchang Li

Timothy Marlow Boller

Machteld M W Mertens

Carlos R Lopez-Barron

Joseph Moebus

Derek W Thurman

James R Aspinwall

Garry A Armbruster

Ru Xie

Keith R Green

Matthew W Holtcamp

Laughlin G Mccullough

Hasain Rangwall

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

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

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

Methods for scale-up from a pilot plant to full production of a bimodal polymer product having a density, melt index, and a melt index ratio are provided herein. The methods provide for adjusting reactor conditions and catalyst ratio of a bimodal catalyst system to optimize the transition from single catalyst to bimodal polymer compositions on a full-scale process plant consistent with pilot plant development.

Methods for scale-up from a pilot plant to a larger production facility

Methods for scale-up from a pilot plant to a larger production facility of a bimodal polymer product having a density, a melt index and melt index ratio are provided herein.

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.

Provided herein are polyethylene compositions with broad orthogonal composition distribution. The polyethylene compositions may comprise at least 65 wt % ethylene-derived units and from 0 to 35 wt % of Cto Colefin comonomer-derived units, and furthermore may exhibit a reversed comonomer index (RCI,m) of 100 kg/mol or greater, a Tw-Twvalue of from &#x2212;16 to &#x2212;38&#xb0; C., and an Mw/Mwvalue of at least 0.9, such as 0.9 to 4. Also provided are processes for making the polyethylene compositions, as well as films made from the polyethylene compositions. Such films may feature superior film stiffness for a given polyethylene composition density, and accordingly such films in some embodiments have average MD/TD modulus and density satisfying the following equation: Avg. Modulus&#x2265;1.2*(C1*Density&#x2212;C2), where C1 and C2 are constants, such as C1=2,065,292 and C2=1,872,345.

Polyethylene compositions and films made therefrom

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

Beaumont, TX, United States of America

David F Sanders