Nova Chemicals (International) S.a.

Nova Chemicals Inc.

Novacor Chemicals Ltd.

P Scott Chisholm

Tony Tikuisis

Norman Dorien Joseph Aubee

Douglas Checknita

Xiaoliang Gao

Denny Paul Sauvageau

Patrick Lam

Owen Lightbody

Sarah Marshall

Janelle Smiley-Wiens

Tingting Yu Chuang

Stephen John Brown

Darryl Morrison

Cliff Baar

Ian Douglas McKay

Robert D Donaldson

Matthew Gerald Kowalchuk

Fazle Sibtain

Kenneth Edward Taylor

Hamidreza Khakdaman

Shivendra K Goyal

Christopher John Brooke Dobbin

Yves Lacombe

Norman Aubee

Charles Carter

Cheng Fan

Derek Wasylenko

Graham Lee

Fraser Waldie

Qinyan Wang

Peter Zoricak

Peter Phung Minh Hoang

Brian Molloy

Charles Ashton Garret Carter

Eric Clavelle

Dusan Jeremic

Kamal Elias Serhal

Isam Jaber

Andrzej Z Krzywicki

Daryll G Harrison

Nitin Borse

Ian Gibbons

Ian Ronald Jobe

Alison Ciupa

Nick K Bohnet

Jessie Leighton

James T Goettel

Frederick Chiu

Vernon Lindsay Strom

Oleksiy Golovchenko

Jared Taylor

Chia Yun Chang

Alva Woo

Anita Sylvia Magis

Dale Alexander Sieben

Michel Berghmans

Keith WAyne Besenski

Russell Kirk Archer

Jamie Michael Marler

Laura Elaine Ellis

Mackenzie Alexander Harris

Rajesh Dahyabhai Patel

Fraser D Cole Waldie

Stephen J Brown

Shivendra Kumar Goyal

Christopher Dobbin

Kamal Serhal

Peter Phung Hoang

Tingting Chuang

Charles A G Carter

Norman Dorien Aubee

James Goettel

Charles A Carter

Kenneth Taylor

Cliff Robert Baar

Andrzej Krzywicki

Charles Ashton Carter

Ian Mckay

Ian Robert Gibbons

Owen C Lightbody

A polymer processing aid (PPA) reduces melt defects in extruded polyolefins in the absence of fluoropolymers. The polymer processing aid comprises a polyalkylene glycol such as a polyethylene glycol together with a high pressure low density polyethylene (LDPE) and reduces melt defects well in a thermoplastic polyolefin such as a linear low density polyethylene (LLDPE).

Fluoropolymer free polymer processing aids

Provided in this disclosure are zirconium and hafnium complexes that contain 1) a cyclopentadienyl ligand; 2) an adamantyl-phosphinimine ligand; and 3) at least one other ligand. The use of such a complex, in combination with an activator, as an olefin polymerization catalyst is demonstrated. The catalysts are effective for the copolymerization of ethylene with an alpha olefin (such as 1-butene, 1-hexene, or 1-octene).

Cyclopentadienyl/adamantyl phosphinimine zirconium and hafnium complexes

Provided in this disclosure are titanium complexes that contain 1) a cyclopentadienyl ligand; 2) an adamantyl-phosphinimine ligand; and 3) at least one activatable ligand. The use of such a complex, in combination with an activator, as an olefin polymerization catalyst is demonstrated. The catalysts are effective for the copolymerization of ethylene with an alpha olefin (such as 1-butene, 1-hexene or 1-octene) and enable the production of high molecular weight copolymers (Mw greater than 25,000) at high productivity under solution polymerization conditions.

Cyclopentadienyl/adamantyl phosphinimine titanium complexes

In the manufacture of extruded polymers there are a number of surface defects referred to as sharkskin, snakeskin and orange peel which all generally relate to the rheology of the polymer melt. A severe form of surface defect is 'melt fracture' which is believed to result when the shear rate at the surface of the polymer is sufficiently high that the surface of the polymer begins to fracture. That is, there is a slippage of the surface of the extruded polymer relative to the body of the polymer melt. The surface generally can't flow fast enough to keep up with the body of the extrudate and a fracture in the melt occurs generally resulting in a severe loss of surface properties for the extrudate. A polymer extension process is disclosed wherein these undesirable surface defects are eliminated.

Polymer extrusion process

Barrier films are prepared from a composition comprising 1) a blend of two high density polyethylene HDPE blend components, 2) zinc glycerolate and 3) a dispersion aid/synergist. The two high density polyethylene blend components have substantially different melt indices. It is difficult to properly mix the zinc glycerolate into this HDPE blend. The use of the dispersion aid/synergist improves the water vapor transmission rate (WVTR) of polyethylene film (in comparison to barrier films made with zinc glycerolate, in the absence of the dispersion aid/synergist). The resulting barrier films are suitable for the preparation of packaging for dry foods such as crackers and breakfast cereals.

Barrier film composition

Provided in this disclosure are organometallic complexes that contain i) a metal atom selected from Hf and Zr; 2) a phosphinimine ligand; 3) an amido-ether ligand and at least one other ancillary ligand. The use of such a complex, in combination with an activator, as an olefin polymerization catalyst is demonstrated. The catalysts are effective for the copolymerization of ethylene with an alpha olefin (such as 1-butene, 1-hexene, or 1-octene) and enable the production of high molecular weight copolymers (Mw greater than 25,000) with good comonomer incorporation at high productivity.

Phosphinimine amido-ether complexes

This disclosure relates to a continuous solution polymerization process where ethylene interpolymer products having an improved color index; for example, products having higher whiteness (Whiteness Index (WI)) and lower yellowness (Yellowness Index (YI)). Product color was improved by adjusting selected solution polymerization reaction conditions. The disclosed ethylene interpolymer products have improved color relative to comparative polyethylene compositions.

Ethylene interpolymers having improved color

A solution polymerization process uses a reactor system in which a first stage is operated in a non adiabatic (cooled) manner and is connected to a second stage containing a downstream reactor that is operated adiabatically. In an embodiment, the first reactor stage includes at least one loop reactor and the second stage includes a tubular reactor. In an embodiment, the first stage is operated with a single site catalyst and at least one downstream reactor uses a Ziegler Natta catalyst.

Solution polymerization process

In some embodiments, this disclosure provides a process for the stabilization of thermoplastic polyolefins during melt processing operations. In some embodiments, the stabilizer package disclosed herein is 'phenol free' and contains at least one solid aryl monophosphite and a specific liquid phosphite. The processes disclosed herein are suitable for the manufacture of polyethylene film.

Mixed phosphite stabilization of polyethylene film

The oligomerization of ethylene using a chromium catalyst having a heteroatomic ligand may be used to provide oligomerization products that are selective towards hexene and/or octene. However, such processes also typically produce some polymer as an undesirable by product. The present invention is directed towards improvements in the selective oligomerization of ethylene.

Heat management in ethylene oligomerization

Barrier films are prepared from a blend of two high density polyethylene blend components and a high performance organic nucleating agent. The two high density polyethylene blend components have substantially different melt indices. Large reductions in the moisture vapor transmission rate of the film are observed in the presence of the nucleating agent when the melt indices of the two blend components have a ratio of greater than 10/1. The resulting barrier films are suitable for the preparation of packaging for dry foods such as crackers and breakfast cereals.

Barrier film for food packaging

A multilayer film is prepared from a high impact strength polyethylene (HI polyethylene); a Ziegler Natta catalyzed polyethylene (Z/N polyethylene) and a high pressure low density polyethylene (LD polyethylene) with i) at least one skin layer consists essentially of HI polyethylene and ii) at least one core layer comprises a blend of Z/N polyethylene and said LD polyethylene. The HI polyethylene has a density of from 0.915 to about 0.930 g/cc and a normalized impact strength of at least about 300 g/mil. The amount of HI polyethylene is from about 30 to about 55 weight % (based on the combined weights of the HI+Z/N+LD polyethylenes). The films described herein are readily prepared on blown film equipment and provide an excellent balance of mechanical properties.

Multilayer films

This invention provides a process for the stabilization of thermoplastic polyolefins during melt processing operations. The stabilizer package of this invention is 'phenol free' and comprises at least two selected phosphite stabilizers. In some embodiments, the process is suitable for the manufacture of polyethylene film.

Phenol free stabilization of polyethylene

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Calgary, Canada

P Scott Chisholm