Nova Chemicals (international) S.a.

University of Alberta

Other

Nova Chemicals Inc.

Qinyan Wang

Peter Zoricak

XiaoChuan Wang

Brian Molloy

Lawrence VanAsseldonk

Stephen John Brown

Ronald G Cavell

Aparna Kasani

Wei Xu

Xiaoliang Gao

Norman Aubee

Zengrong Zhang

Rupert Edward Von Haken Spence

Douglas W Stephan

Fazle Sibtain

Kenneth Edward Taylor

Patrick Lam

Stephen Salomons

Hamidreza Khakdaman

Niousha Kazemi

Monika Kleczek

Mehdi Keshtkar

Charles Carter

Christopher Dobbin

Amy Baltimore

Ruppa P Kamalesh Babu

Steven Clemens

Mohamed Aiffa

Tyler Craig

Holly Ann Severin

Rupert Edward Spence

Isam Jaber

Ian Douglas McKay

Daryll G Harrison

Linda Koch

Bradley Wade Funk

Lawrence Martin Josef Van Asseldonk

Garry Takashi Yamashita

Helena Ouskine

Perry Dewit

Dusan Jeremic

John William Swabey

Ryan Paul Wurz

Jeff C Stewart

Savini Udara Suduweli Kondage

Savina Udara Suduweli Kondage

Amy Marie Baltimore

Ian Mckay

P Scott Chisholm

Mark Kelly

Matthew Gerald Kowalchuk

Scott Collins

John McMeeking

James Arthur Auger

Gail Baxter

Lianyou Fan

Holly Kalma

Rainer Vollmerhaus

Marissa Clapson

Ruppa P Babu

Kevin Dickinson

Jessamyn Ross Logan

Kondage Savini Udara Suduweli

Holly Severin

Lawrence Martin Van Asseldonk

John Mcmeeking

Savini Udara Kondage

Lawrence Van Asseldonk

Jessamyn Logan

Savini Kondage

Lawrence Vanasseldonk

Bradley Funk

A polyethylene composition which when made into a film layer having a thickness of about 1 mil has a machine direction (MD) 1% secant modulus of ≥200 MPa and an oxygen transmission rate (OTR) of ≥600 cmper 100 inchper day and when made into a film layer having a thickness of about 2 mil has a seal initiation temperature (SIT) of ≤90° C. and an area of hot tack window (AHTW) of ≥160 Newtons·° C.

Polyethylene composition and film having high stiffness, outstanding sealability and high permeability

The copolymerization of ethylene with a cyclic mono olefin (such as norbornene) is conducted in the presence of a catalyst system comprising a bridged hafnocene catalyst and a three part activator. The catalyst system provides excellent activity at high polymerization temperatures. Copolymers produced according to this invention have unique microstructure (with methyl branching being observed) and unique rheology.

Ethylene-cyclic mono olefin copolymerizations

A polyethylene composition including a first polyethylene which is an ethylene copolymer having a weight average molecular weight of from 70,000 to 250,000 and a molecular weight distribution M/Mof &#x3c;2.3, a second polyethylene which is an ethylene copolymer or homopolymer having a weight average molecular weight of from 50,000 to 200,000 and a molecular weight distribution M/Mof &#x3c;2.3, and a third polyethylene which is an ethylene copolymer or homopolymer having a weight average molecular weight of from 70,000 to 200,000 and a molecular weight distribution M/Mof &#x3c;2.3, where the first polyethylene has more short chain branching than the second polyethylene or the third polyethylene.

Polyethylene composition and film having outstanding properties

A polyethylene composition includes a first polyethylene which is an ethylene copolymer having a weight average molecular weight of from 70,000 to 250,000 and a molecular weight distribution Mw/Mn of &#x3c;2.3, a second polyethylene which is an ethylene copolymer or homopolymer having a weight average molecular weight of from 15,000 to 100,000 and a molecular weight distribution Mw/Mn of &#x3c;2.3, and a third polyethylene which is an ethylene copolymer or homopolymer having a weight average molecular weight of from 70,000 to 250,000 and a molecular weight distribution Mw/Mn of &#x3e;2.3, where the first polyethylene has more short chain branching than the second polyethylene or the third polyethylene. The polyethylene composition has a soluble fraction in a CEF analysis of at least 10 weight percent. Film made from the polyethylene composition may have a machine direction 1% secant modulus of &#x25a1;190 MPa (at a film thickness of about 1 mil), a seal initiation temperature (SIT) of &#x2264;100&#xb0; C. (at a film thickness of about 2 mil), an area of hot tack window (AHTW) of &#x2265;160 Newtons&#xb7;C&#xb0; (at a film thickness of about 2 mil) and an oxygen transmission rate (OTR) of &#x2265;650 cm3 per 100 inch2 per day (at a film thickness of about 1 mil).

Polyethylene composition and film having a good permeability, stiffness and sealability

A polyethylene composition comprises a first polyethylene which is an ethylene copolymer having a weight average molecular weight of from 70,000 to 250,000 and a molecular weight distribution M/Mof &#x3c;2.3, a second polyethylene which is an ethylene copolymer or homopolymer having a weight average molecular weight of from 50,000 to 200,000 and a molecular weight distribution M/Mof &#x3c;2.3, and a third polyethylene which is an ethylene copolymer or homopolymer having a weight average molecular weight of from 70,000 to 200,000 and a molecular weight distribution M/Mof &#x3c;2.3, where the first polyethylene has more short chain branching than the second polyethylene or the third polyethylene. The polyethylene composition has a composition distribution breadth index, CDBIobtained from a crystallization elution fractionation (CEF) analysis of &#x3c;45 weight %. A film made from the polyethylene composition may have a machine direction 1% secant modulus of &#x2265;200 MPa (at a film thickness of about 1 mil), a seal initiation temperature (SIT) of &#x2264;85&#xb0; C. (at a film thickness of about 2 mil), an area of hot tack window (AHTW) of &#x2265;220 Newtons&#xb7;C&#xb0; (at a film thickness of about 2 mil), an oxygen transmission rate (OTR) of &#x2265;600 cmper 100 inchper day (at a film thickness of about 1 mil), a dart impact strength of &#x2265;400 g/mil, and a machine direction (MD) tear strength of &#x2265;400 g/mil.

A polyethylene composition includes a first polyethylene which is an ethylene copolymer having a weight average molecular weight of from 70,000 to 250,000 and a molecular weight distribution M/Mof &#x3c;2.3, a second polyethylene which is an ethylene copolymer or homopolymer having a weight average molecular weight of from 15,000 to 100,000, a molecular weight distribution M/Mof &#x3e;2.3, and a third polyethylene which is an ethylene copolymer or homopolymer having a weight average molecular weight of from 70,000 to 250,000 and a molecular weight distribution M/Mof &#x3e;2.3, where the first polyethylene has more short chain branching than the second polyethylene or the third polyethylene. The polyethylene composition has a soluble fraction in a CEF analysis of at least 10 weight percent. Film made from the polyethylene composition may have a machine direction 1% secant modulus of 200 &#x2265;MPa (at a film thickness of about 1 mil), a seal initiation temperature (SIT) of &#x2264;90&#xb0; C. (at a film thickness of about 2 mil), an area of hot tack window (AHTW) of &#x2265;160 Newtons&#xb7;C&#xb0; (at a film thickness of about 2 mil) and an oxygen transmission rate (OTR) of &#x2265;600 cmper 100 inch per day (at a film thickness of about 1 mil).

A polyethylene composition including a first polyethylene which is an ethylene copolymer having a weight average molecular weight of from 70,000 to 250,000 and a molecular weight distribution M/Mof &#x3c;2.3, a second polyethylene which is an ethylene copolymer or homopolymer having a weight average molecular weight of less than 75,000 and a molecular weight distribution M/Mof &#x3c;2.3, and a third polyethylene which is an ethylene copolymer or homopolymer having a weight average molecular weight of from 100,000 to 300,000 and a molecular weight distribution M/Mof &#x3e;2.3, where the first polyethylene has more short chain branching than the second polyethylene or the third polyethylene. The polyethylene composition has a soluble fraction in a CEF analysis of at least 15 weight percent. A film made from the polyethylene composition may have a machine direction 1% secant modulus of &#x2265;200 MPa (at a film thickness of about 1 mil) and an oxygen transmission rate (OTR) of &#x2265;700 cmper 100 inchper day (at a film thickness of about 1 mil). A film made from the polyethylene composition retains much of its dart impact performance on downgauging from a thickness of 1 mil to a thickness of 0.75 mil.

Polyethylene composition and film having retained dart impact

In some embodiments disclosed herein are polyethylene composition including a first polyethylene which is an ethylene copolymer having a weight average molecular weight of from 70,000 to 250,000 and a molecular weight distribution M/Mof &#x3c;2.3, a second polyethylene which is an ethylene copolymer or homopolymer having a weight average molecular weight of less than 75,000 and a molecular weight distribution M/Mof &#x3c;2.3, a third polyethylene which is an ethylene copolymer or homopolymer having a weight average molecular weight of less than 75,000 and a molecular weight distribution M/Mof &#x3c;2.3, and a fourth polyethylene which is an ethylene copolymer or homopolymer having a weight average molecular weight of from 100,000 to 250,000 and a molecular weight distribution M/Mof &#x3e;2.3, where the first polyethylene has more short chain branching than the second polyethylene or the third polyethylene. The polyethylene composition may have a soluble fraction in a CEF analysis of at least 7.5 weight percent. Film made from the polyethylene composition may have a machine direction 1% secant modulus of 200 MPa (at a film thickness of about 1 mil) and an oxygen transmission rate (OTR) of &#x2265;550 cmper 100 inch per day (at a film thickness of about 1 mil). Film made from the polyethylene composition retains much of its dart impact performance on downgauging from a thickness of 1 mil to a thickness of 0.75 mil.

Polyethylene composition and film

The various embodiments provide, a magnesium titanium polymerization procatalyst, and methods for making and using the same.

Off-line filter free Ziegler-Natta catalyst preparation

A continuous solution polymerization process is disclosed wherein at least two catalyst formulations are employed. A first homogeneous catalyst formulation is employed in a first reactor to produce a first ethylene interpolymer and a first heterogeneous catalyst formulation is employed in a second reactor to produce a second ethylene interpolymer. Optionally a third ethylene interpolymer is formed in a third reactor. The resulting ethylene interpolymer products possess desirable properties in a variety of end use applications, for example in film applications. A means for increasing the molecular weight of the first ethylene interpolymer is disclosed and/or a means for increasing the temperature of the first reactor, relative to a third homogeneous catalyst formulation. A means for reducing the (&#x3b1;-olefin/ethylene) weight ratio in the first reactor is disclosed and/or reducing the density of the first ethylene interpolymer, relative to a third homogeneous catalyst formulation.

Means for increasing the molecular weight and decreasing the density of ethylene interpolymers employing homogeneous and heterogeneous catalyst formulations

A continuous solution polymerization process is disclosed wherein at least two homogeneous catalyst formulations are employed. A first homogeneous catalyst formulation is employed in a first reactor to produce a first ethylene interpolymer and a second homogeneous catalyst formulation is employed in a second reactor to produce a second ethylene interpolymer. Optionally a third ethylene interpolymer is formed in a third reactor. The resulting ethylene interpolymer products possess desirable properties in a variety of end use applications, for example in film applications. A means for increasing the molecular weight of the first ethylene interpolymer is disclosed and/or a means for increasing the temperature of the first reactor, relative to the third homogeneous catalyst formulation. A means for reducing the (&#x3b1;-olefin/ethylene) weight ratio in the first reactor is disclosed and/or reducing the density of the first ethylene interpolymer, relative to the third homogeneous catalyst formulation.

Means for increasing the molecular weight and decreasing the density of ethylene interpolymers employing mixed homogeneous catalyst formulations

The various embodiments of the invention provide, a magnesium dichloride support and the magnesium titanium polymerization procatalyst made therefrom, and methods for making and using the same.

Synthesis of magnesium dichloride support for the AST off-line ZN catalyst with a plug flow reactor (PFR)

The various embodiments of the invention provide, a magnesium titanium polymerization procatalyst, methods for making and using the same.

Ziegler-Natta catalyst for high temperature polymerization

Growing community of inventors

Calgary, Canada

Qinyan Wang