Nova Chemicals (international) S.a.

The Governors of the University of Alberta

Peter Phung Minh Hoang

Victoria Ker

Charles Ashton Garret Carter

Cliff Baar

Yan Jiang

Patrick Lam

Xiaoliang Gao

Darryl Morrison

Benjamin Milton Shaw

Lee Douglas Henderson

Ian Ronald Jobe

Jason Roy Kearns

Peter Zoricak

Yves Lacombe

Dusan Jeremic

Nai-Hong Li

Robert D Donaldson

Sergio Alejandro Guillen-Castellanos

Charles Russell

Sieghard E Wanke

Paul Mesquita

David T Lynch

Iain McLaren Coulter

P Scott Chisholm

Matthew Gerald Kowalchuk

Bradley Wade Funk

Billy Santos

Patrick Drew Evans

Jessie Leighton

Amy Phinney

Gail Baxter

Robert Joseph Louis Quaiattini

Martina Elissa Djatmiko

Rajesh Dahyabhai Patel

Andy Mak

Amy Marie Jones

A method for altering the melt flow ratio (MFR) of ethylene copolymers made in a gas phase reactor using a supported Ziegler-Natta catalyst treated with a catalyst modifier. The method involves changing the amount of the catalyst modifier added to the supported Ziegler-Natta polymerization catalyst to effect changes in the MFR of the resulting polymer.

Method for altering melt flow ratio of ethylene polymers

A process for controlling the placement of alpha olefins within an ethylene copolymer. The process involves polymerizing ethylene and an alpha olefin in the gas phase while changing the breadth of control over the molar ratio of ethylene to comonomer and/or hydrogen which is being fed to a polymerization reactor. At tighter control breadths, the alpha olefin may be incorporated mainly in the higher molecular weight portions of the ethylene copolymer. At looser control breadths, the alpha olefin may be incorporated more evenly throughout the ethylene copolymer or mainly in the lower molecular weight portions of the ethylene copolymer.

Controlling the placement of comonomer in an ethylene copolymer

Ethylene copolymers having a relatively high melt flow ratio and a multimodal profile in a temperature rising elution fractionation (TREF) plot are disclosed. The copolymers can be made into film having good dart impact values and good stiffness properties under decreased extruder pressures.

Ethylene copolymer compositions, film and polymerization processes

Ethylene copolymers, film and polymerization process

Olefin polymerization is carried out with a supported phosphinimine catalyst which has been treated with a long chain substituted amine compound.

Modified phosphinimine catalysts for olefin polymerization

A supported catalyst system comprising a phosphinimine ligand containing catalyst on an alumina support treated with a metal salt has improved reactor continuity in a dispersed phase reaction in terms of initial activation and subsequent deactivation. The resulting catalyst has a lower consumption of ethylene during initiation and a lower rate of deactivation. Preferably the catalyst is used with an antistatic agent.

Reactor continuity

A highly active, supported phosphinimine catalyst is fed to a gas phase reactor as a slurry in a liquid hydrocarbon. Feeding the catalyst to a gas phase reactor in a viscous liquid hydrocarbon modifies catalyst initiation kinetics.

Feeding highly active phosphinimine catalysts to a gas phase reactor

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Peter Phung Minh Hoang