Exxonmobil Chemical Patents Inc.

Adriana S Silva

Matthew William Holtcamp

Matthew S Bedoya

David F Sanders

Ching-Tai Lue

Dongming Li

Wen Li

Jianya Cheng

Xuan Ye

Charles J Harlan

Alexander I Norman

Laughlin G McCullough

Subramaniam Kuppuswamy

Periagaram Srinivasan Ravishankar

Kevin A Stevens

Ryan Winston Impelman

Richard E Pequeno

Peijun Jiang

Abdelhadi Sahnoune

David Michael Fiscus

Arturo Leyva

Joshua P Olson

David John Lohse

Weiqing Weng

Edward N Kresge

Timothy Marlow Boller

Porter Clarke Shannon

Timothy D Shaffer

Pamela Jean Wright

Arnold Lustiger

Rohan A Hule

Thomas T Sun

Johannes Matthieu Soulages

Joseph Moebus

Madhavi Vadlamudi

Hasnain Rangwalla

Scott C Solis

Matthew F Yott

Ru Xie

Gregory S Caraway

Miguel O Mota

Matthew W Holtcamp

Laughlin G Mccullough

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

In some embodiments, the present disclosure provides a composition comprising 1) about 97.5 wt % to about 99.9 wt % of a first polyethylene having a density of about 0.91 g/cmto about 0.94 g/cm, and a melt strength of about 10 mN or greater; and 2) about 0.1 wt % to about 2.5 wt % of a second polyethylene having an Mw of about 500,000 g/mol or more. In some embodiments, the composition is a film. In some embodiments, the present disclosure provides a method of making a composition comprising blending a first polyethylene of any embodiment described herein and a second polyethylene of any embodiment described herein.

Enhanced processability of LLDPE by addition of ultra-high molecular weight density polyethylene

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 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

The present disclosure provides processes for polymerizing olefin(s). Methods can include contacting a first composition and a second composition in a line to form a third composition. The first composition can include a contact product of a first catalyst, a second catalyst, a support, a first activator, a mineral oil. The second composition can include a contact product of an activator, a diluent, and the first catalyst or the second catalyst. Methods can include introducing the third composition from the line into a gas-phase fluidized bed reactor, introducing a condensing agent to the line and/or the reactor, exposing the third composition to polymerization conditions, and/or obtaining a polyolefin. Polyethylene compositions including at least 65 wt % ethylene derived units, based upon the total weight of the polyethylene composition, are provided.

Polymerization processes and polymers made therefrom

Catalyst systems including more than one metallocene catalysts and processes for using the same are provided to produce polyolefin polymers such as polyethylene polymers.

Catalyst systems and polymerization processes for using the same

Polyethylene compositions including at least 65 wt % ethylene derived units, based upon the total weight of the polyethylene composition, are provided.

A polyethylene useful for a film including ethylene derived units and within a range from 0.5 to 20 wt % of C3 to C12 &#x3b1;-olefin derived units, an Ivalue within a range from 0.5 to 20 g/10 min, an Ivalue within a range from 5 to 100 g/10 min, the polyethylene formed from a process comprising combining a bridged bis-cyclopentadienyl Group 4 metal catalyst, an unbridged bis-cyclopentadienyl Group 4 metal catalyst, and an activator with ethylene and within a range from 0.1 to 5 wt %, relative to the weight of all monomers, of a C3 to C12 &#x3b1;-olefin at a temperature within a range from 60 to 100&#xb0; C.

Broad orthogonal distribution metallocene polyethylenes for films

A method of forming a blown film comprising extruding a molten composition through a die opening to form a film; wherein the molten composition comprises at least one polyethylene and within the range from 0.10 wt % to 10 wt % of a cyclic-diene terpolymer by weight of the composition; causing the film to progress in a direction away from the die opening; cooling the film at a distance from the die opening, the distance adjusted to effect the properties of the film; and isolating a blown film therefrom.

Cyclic-diene additives in polyethylene films and enhanced film orientation balance in production thereof

A method of forming a finished film comprising extruding a molten polyethylene comprising a diene terpolymer modifier through a die opening to form a film, wherein the diene-terpolymer modifier is a terpolymer comprising ethylene-derived units, Cto C&#x3b1;-olefin derived units, and diene-derived units; causing the film to progress in a direction away from the die opening; cooling the film at a distance from the die opening, the distance adjusted to allow relaxation of the molten polyethylene prior to solidification and/or crystallization upon cooling; and isolating a finished film therefrom. Desirably, the polyethylene is a linear low density polyethylene, and the die and cooling is suitable for forming a blown film.

Polyethylene films and production of such films

Growing community of inventors

Houston, TX, United States of America

Adriana S Silva