Nova Chemicals (international) S.a.

Nova Chemicals Inc.

Yves Lacombe

Stephen John Brown

XiaoChuan Wang

Stephen Salomons

Eric Clavelle

Celine Bellehumeur

Mark Hoidas

Victoria Ker

Peter Phung Minh Hoang

P Scott Chisholm

Brian Molloy

Lawrence VanAsseldonk

Niousha Kazemi

Mark Edmund Weber

Peter Phung Hoang

Fazle Sibtain

Charles Ashton Garret Carter

Yan Jiang

Kamal Elias Serhal

Benjamin Milton Shaw

Andrzej Z Krzywicki

Isam Jaber

Mehdi Keshtkar

Douglas Checknita

Mark Rejman

Matthew Zaki Botros

Renee Laurel Anseeuw

Ian Ronald Jobe

Geoffrey Harding

Patrick Drew Evans

Craig Allan Hulet

Andrew Hawryluk

Lawrence Van Asseldonk

Vernon Lindsay Strom

Dale Alexander Sieben

Joel Racle

Ian Woods

Marion Walls

Anita Sylvia Magis

Mackenzie Alexander Harris

Russell Kirk Archer

Keith WAyne Besenski

Michel Berghmans

Oleksiy Golovchenko

Geoffrey Richard Harding

Andrzej Krzywicki

Craig Hulet

Douglas Walter Checknita

Stephen Brown

Renée Laurel Anseeuw

Disclosed herein are polymerization processes where recycled polymeric material is fed to polymerization process to produce a blend of virgin polymer with recycled polymeric content.

Processes for producing polyethylene containing recycled polymeric material

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

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

The various embodiments of the present invention relate to a polymerization reactor where the agitator mixing performance is optimized for use with a high activity catalyst and methods for developing the same.

Optimized agitator system for production of polyolefin

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

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.

Multi reactor solution polymerization

Resins suitable for rotomolded articles comprise a bimodal polyethylene copolymer comprising from 0.1 to 5 weight % of one or more Calpha olefins and the balance ethylene, comprising from 20 to 50 weight % of a higher molecular weight polymer component having an Mw greater than 120,000 and correspondingly from 80 to 50 weight % of a lower molecular weight polymer component having an Mw less than 100,000 having a density greater than 0.942 g/cc [but less than 0.965 g/cc] and a bent strip ESCR as determined by ASTM D 1693 in 100% Igepal&#xae; CO-630 (ethoxylated nonylphenols) for conditions A and B of greater than 1000 hours. The resulting articles have a very good balance of properties and significant ESCR.

Rotomolding resin

A dual reactor solution process gives high density polyethylene compositions containing a first ethylene copolymer and a second ethylene copolymer and which have good processability, toughness, and environmental stress crack resistance combined with good organoleptic properties. The polyethylene compositions are suitable for compression molding or injection molding applications and are particularly useful in the manufacture of caps and closures for bottles.

Polyethylene compositions and closures for bottles

Resins suitable for rotomolded articles comprise a bimodal polyethylene copolymer comprising from 0.1 to 5 weight % of one or more Calpha olefins and the balance ethylene, comprising from 20 to 50 weight % of a higher molecular weight polymer component having an Mw greater than 120,000 and correspondingly from 80 to 50 weight % of a lower molecular weight polymer component having an Mw less than 100,000 having a density greater than 0.942 g/cc [but less than 0.965 g/cc] and a bent strip ESCR as determined by ASTM D 1693 in 100 % Igepal&#xae; CO-630 (ethoxylated nonylphenols) for conditions A and B of greater than 1000 hours. The resulting articles have a very good balance of properties and significant ESCR.

A dual reactor solution polymerization process gives high density polyethylene compositions containing a first ethylene copolymer and a second ethylene copolymer and which have high dimensional stability, excellent processability as well as good organoleptic properties and reasonable stress cracking resistance. The polyethylene compositions are suitable for compression molding or injection molding applications and are useful, for example, in the manufacture of caps and closures for bottles, and for example, in bottles containing non-pressurized liquids.

Polyethylene compositions having high dimensional stability and excellent processability for caps and closures

A scavenger is used to indirectly control the ratio of polymer components in a polyethylene composition made using a combination catalyst comprising an inorganic chromium catalyst, and a group 4 single site catalyst.

Adjusting polymer composition

The present invention provides a method to calibrate a NIR analyzer to measure monomer concentrations at one or more locations in a reactor system. The regression coefficients for the NIR analyzer are transferable between reactors using the same process (solution polymerization to solution polymerization) and may be used to control the reaction, or calibrate flow meters on line.

Double derivative NIR process control

In the high pressure of polymerization of ethylene homopolymer or copolymers conditions in the reactor may become unstable leading to the decomposition ('decomp') of the reaction mixture. Monitoring temperature excursions traveling through the reactor over close thermocouples (a roller) to detect changes in the mean temperature and the moving temperature front for a group of thermocouples detects conditions potentially leading to a decomp.

Roller detection

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Calgary, Canada

Yves Lacombe