Nova Chemicals (international) S.a.

Nova Chemicals Inc.

Sarah Marshall

Patrick Lam

Norman Dorien Joseph Aubee

P Scott Chisholm

Tony Tikuisis

Douglas Checknita

Denny Paul Sauvageau

Tingting Yu Chuang

Stephen John Brown

Christopher John Brooke Dobbin

Gilbert Alexander Arnould

Mark Edmund Weber

John William Swabey

Clayton Trevor Elston

Lawrence Thomas Kale

Christopher John Dobbin

Norman Dorien Aubee

Tingting Chuang

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 blend of ethylene homopolymers contains at least one blend component having a very low molecular weight and a narrow molecular weight distribution. The blend has surprisingly high density and low hexane extractables. The blend is suitable for the manufacture of a wide variety of plastic goods including extruded goods and molded goods. Plastic film prepared from the blends of this invention have a low Water Vapor Transmission Rate ('WVTR').

High density homopolymer blends

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

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Calgary, Canada

Sarah Marshall