Nova Chemicals (international) S.a.

Du Pont of Canada Limited

Nova Chemicals Inc.

Clayton Trevor Elston

Stephen John Brown

Christopher John Brooke Dobbin

Gilbert Alexander Arnould

Norman Dorien Joseph Aubee

Mark Edmund Weber

Sarah Marshall

Lawrence Thomas Kale

Christopher John Dobbin

Norman Dorien Aubee

Mark Weber

Novel polyethylene copolymer compositions prepared with a homogeneous catalyst system are characterized by having a unique high molecular weight, low comonomer (high density) fraction. These heterogeneous/homogeneous compositions may be prepared using a solution polymerization process in which the polymerization reactor contains a gradient in temperature, catalyst concentration or monomer concentration. The heterogeneous/homogeneous compositions of this invention are easily processed into films having excellent tear strengths and low hexane extractables.

Heterogeneous/homogeneous copolymer

A polymer of an alpha-olefin and at least one diene with low residual unsaturation and long chain branching and the process for preparing said polymer. The process comprises polymerizing an alpha-olefin (ethylene) with at least one diene in the presence of a coordination catalyst, the diene being selected from linear .alpha.,.omega.-dienes of at least eight carbon atoms (1,7-octadiene) and cyclic endomethylenic dienes (bicyclo(2,2,1)-2-5-heptadiene, dinorbornene), the diene being characterized in that each one of the two double bonds is readily polymerizable.

Ethylene polymers with long chain branching

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Kingston, Canada

Clayton Trevor Elston