Nova Chemicals (international) S.a.

Lawrence VanAsseldonk

XiaoChuan Wang

Qinyan Wang

Peter Zoricak

Brian Molloy

Stephen Salomons

Niousha Kazemi

Norman Aubee

Fazle Sibtain

Kenneth Edward Taylor

Hamidreza Khakdaman

Monika Kleczek

Mehdi Keshtkar

Zengrong Zhang

Charles Carter

Christopher Dobbin

Stephen John Brown

Yves Lacombe

Marissa Clapson

Holly Kalma

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

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

Disclosed are methods and conditions for manufacturing a polyethylene polymer or copolymer in a liquid/liquid biphasic non-adiabatic reaction, and the compositions and articles made therefrom.

Non adiabatic 2-phase (liquid-liquid) polymerization process

This disclosure relates to a continuous solution three reactor polymerization process. Process solvent, ethylene, optional comonomers, optional hydrogen and a single site catalyst system are injected into a first and second reactor configured in parallel to one another. A third reactor receives effluent from the first reactor, the second reactor, or a combination of the first and second reactors. Fresh monomer is feed to the third reactor for further polymerization and to give a final polyethylene product.

Growing community of inventors

Sarnia, Canada

Lawrence VanAsseldonk