Univation Technologies, LLC

Exxonmobil Chemical Patents Inc.

Xerox Corporation

Exxon Chemical Patents, Inc.

Dongming Li

Ching-Tai Lue

Matthew William Holtcamp

Francis Charles Rix

Daniel Paul Zilker, Jr

Adriana S Silva

Matthew S Bedoya

David F Sanders

Timothy Marlow Boller

Mark Gregory Goode

Sun-Chueh Kao

Hsien-Chang Wang

Rainer Kolb

Laughlin G McCullough

Chi-I Kuo

James McLeod Farley

C Jeff Harlan

Mark Bradley Davis

Porter Clarke Shannon

Subramaniam Kuppuswamy

Pradeep P Shirodkar

Fathi David Hussein

Hui Chang

Fred David Ehrman

Cesar Alberto Garcia-Franco

Tae Hoon Kwalk

J Stephen Kittelberger

Kevin A Stevens

Steven A Best

Keith Wesley Trapp

Rakesh Kumar

Guerino G Sacripante

Robert D Bayley

Daniel A Foucher

Marko D Saban

Garth Ronald Giesbrecht

Xuan Ye

Donald A White

Charles J Harlan

Joseph L Leonardo

R Eric Pequeno

David Michael Fiscus

Ryan Winston Impelman

Stephen Paul Jaker

Alan E Toth

Hasnain Rangwalla

Richard E Pequeno

Yelena Lipovetskaya

Dennis G Peiffer

John Robert Hagadorn

Jo Ann M Canich

Scott M Silence

Jian Yang

Jean M Frechet

Samir Kumar

Kenneth W Powers

Juan A Morales-Tirado

Eugene Frederick Young

Phillip Thomas Matsunaga

Gang Huang

William H Hollenbaugh, Jr

Stefan B Ohlsson

Rohan A Hule

Cliff Robert Mure

Gerardo Leute

John J Ianni

Amy L Stamp

Chester W Elspass

Paul Lynn Jacobs

Daniel P Zilker

Joseph Moebus

Parul A Khokhani

Thomas Chen-Chi Yu

Arturo Leyva

Barbara J Kopp

Susan J Lafica

Ramyaa Mathialagan

Yan Jiang

Dennis J O'Keefe

Ling Ge

Sun-Cheuh Kao

Ru Xie

Gregory J Smith-Karahalis

Laura A Williams

Nilmarie Santos-Roman

Daniel Andrew Harrington

Kiran B Sheth

Robert Edward Lutz

Louis Joseph Kurtic, Jr

Qingyun Qian

Matthew F Yott

Jeff Harlan C

Timothy M Boller

Fathi D Hussein

Cesar A Garcia-Franco

Jr Daniel P Zilker

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

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

A system and method of producing polyethylene, including: polymerizing ethylene in presence of a catalyst system in a reactor to form polyethylene, wherein the catalyst system includes a first catalyst and a second catalyst; and adjusting reactor conditions and an amount of the second catalyst fed to the reactor to control melt index (MI), density, and melt flow ratio (MFR) of the polyethylene.

Method of producing polyethylene and polyethylene thereof

Provided herein are polyethylene films made of the polyethylene blends having improved properties, particularly in Elmendorf tear and puncture resistance. The polyethylene blends include two primary polyethylene blends.

Polyethylene blends and films

Embodiments relate to polyolefin compositions containing one or more high-density polyethylenes (HDPEs) and linear low-density polyethylenes (LLDPEs) and methods for forming the same. The polyolefin composition contains about 40 wt % to about 60 wt % of HDPE and about 40 wt % to about 60 wt % of LLDPE, by weight of the polyolefin composition. The HDPE has a density of greater than 0.93 g/cmand a melt index of about 0.2 dg/min to about 10 dg/min. The LLDPE has a density of less than 0.915 g/cmand a melt index of about 0.2 dg/min to about 10 dg/min. The polyolefin composition has a density of about 0.91 g/cmor greater, a melt index of about 0.5 dg/min to about 6 dg/min, and a T&#x2212;Tvalue of about &#x2212;25&#xb0; C. or less.

Polyethylene compositions with improved sealing performance and tear strength

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.

This invention relates to a polyethylene composition, and films therefrom, comprising at least 65 wt % ethylene derived units and from 0.1 to 35 wt % of C-Colefin comonomer derived units, where the polyethylene composition has: a) an RCI,m of less than 85 kg/mol; b) a Tw&#x2212;Twvalue of from &#x2212;15 to &#x2212;40&#xb0; C.; and c) an Mw/Mwvalue of less than 1.5 where the film has a) a heat seal initiation temperature of X &#xb0; C. or less at 5 N of force, where X=0.0015&#xd7;Y(psi)+62.6 (where Y is the average 1% Secant modulus ((MD+TD)/2)) of the film; b) a dart drop impact of 300 g/mil or more; c) an MD Elmendorf tear of 230 g or more; and d) average 1% Secant modulus ((MD+TD)/2) of 20,000 psi or more.

Polyethylene compositions and articles made therefrom

The present disclosure provides films made of polyethylene (PE) compositions. In at least one embodiment, a film includes a polyethylene composition, comprising: ethylene content and from 0 to 25 mol % of C-Colefin comonomer content, based upon the total weight of the polyethylene composition, the polyethylene composition having a total internal plus terminal unsaturation greater than 0.7 unsaturations per 1000 carbon atoms, the film having: an Elmendorf Tear value in the machine direction of from 10 g/mil to 300 g/mil, and a Dart Drop Impact of from 100 g/mil to 800 g/mil. In at least one embodiment, the present disclosure provides for processes to make a film.

Films made from polyethylene compositions and processes for making same

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.

A film formed from a polyethylene copolymer using a reduced chromium oxide catalyst, ethylene monomers and a co-monomer selected from butene monomers or 1-hexene, where the polyethylene copolymer has a density in the range of from about 0.935 to about 0.950 g/cmand an I/Iin a range of about 18.0 to about 30.0. The film formed from the polyethylene copolymer has a dart drop impact (g/&#x3bc;m) that significantly greater as compared to a film of the polyethylene copolymer formed using a silyl chromate catalyst in place of the reduced chromium oxide catalyst. A method of making such films is also provided.

Polyolefin film with improved toughness

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

Growing community of inventors

Houston, TX, United States of America

Dongming Li