Nova Chemicals (international) S.a.

Norman Dorien Joseph Aubee

P Scott Chisholm

Tony Tikuisis

Sarah Marshall

Denny Paul Sauvageau

Patrick Lam

Douglas Checknita

Tingting Yu Chuang

Stephen John Brown

XiaoChuan Wang

Peter Zoricak

Shivendra K Goyal

Christopher John Brooke Dobbin

Gilbert Alexander Arnould

Mark Edmund Weber

Owen Lightbody

Kam Wah Ho

Nitin Borse

Ian Gibbons

Clayton Trevor Elston

Lawrence Thomas Kale

Laura Elaine Ellis

Jamie Michael Marler

Shrink film having a desirable balance of properties is manufactured from a polyethylene blend composition having a fractional melt index and a molecular weight distribution of from about 2.5 to about 7. The blend composition comprises a first blend component that is made with a single site catalyst and has a molecular weight of greater than about 140,000 and a first density, d. The blend composition also contains a second blend component having a lower molecular weight and a second density, d, that is greater than the density of din an amount of from about 0.018 to about 0.032 g/cc. The films of this disclosure may be used, for example, as an overwrap or pallet wrap to protect goods during shipping and in food packaging applications (such as shrink wrap for frozen poultry).

Shrink film from single site catalyzed polyethylene

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

A new additive for plastics (for example, polyethylene) is prepared by reacting a fatty acid ester of glycerol (such as glycerol monostearate) with a source of a reactive divalent metal selected from zinc, calcium, and magnesium. In an embodiment, Zinc oxide is the reactive divalent metal and the reaction is conducted in the presence of an acid such as zinc acetate. In one embodiment, a molar excess of zinc oxide (compared to the fatty acid ester) is used. The additive is suitable for use in the preparation of injection molded parts, rotomolded parts, and films.

Polyethylene additive

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 must contain at least one aryl monophosphite and at least one diphosphite. The process of this invention is especially suitable for the manufacture of polyethylene film.

Phenol free stabilization of polyethylene film

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

&ldquo;Cast&rdquo; films having excellent puncture resistance and tear strength are manufactured from &ldquo;pseudohomogeneous&rdquo; linear low-density polyethylene resin. The preferred pseudohomogeneous resins used in the present invention are prepared with an advanced Ziegler Natta catalyst (having a magnesium component and a titanium component), preferably in medium pressure solution polymerization process. The films of this invention are especially suitable for &ldquo;pallet wrapping&rdquo; and for wrapping goods of unusual or uneven shapes and sizes.

Cast films

Growing community of inventors

Okotoks, Canada

Norman Dorien Joseph Aubee