Nova Chemicals (international) S.a.

Nova Chemicals Inc.

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Tony Tikuisis

P Scott Chisholm

Shivendra K Goyal

Norman Aubee

Bronwyn Gillon

Derek Wasylenko

Fraser Waldie

Stephen John Brown

Patrick Lam

Norman Dorien Joseph Aubee

Maryam Fereydoon

Jared Taylor

Fraser D Cole Waldie

Lison Mark

Thomas Green

Christian Carello

A Biaxially Oriented Polyethylene (BOPE) process uses a selected polyethylene having a medium density and a very broad molecular weight distribution. The use of this selected polyethylene facilitates stretching in the BOPE process in comparison to previously used polyethylene resins having a higher density and/or a narrower molecular weight distribution.

Biaxially oriented MDPE film

An ethylene copolymer comprising ethylene and at least one alpha olefin having from 4 to 8 carbon atoms has a density f from 0.940 to 0.960 g/cm, a molecular weight distribution, Mw/Mn of from 9 to 12, and a Z-average molecular weight, Mz of greater than 500,000. The ethylene copolymer is made in a multi-zone reactor system under solution phase polymerization conditions and is useful in the preparation of biaxially oriented polyethylene (BOPE) films.

Ethylene copolymer for biaxial orientation

Barrier films are prepared from a composition comprising 1) a blend of two high density polyethylene HDPE blend components, 2) zinc glycerolate and 3) a dispersion aid/synergist. The two high density polyethylene blend components have substantially different melt indices. It is difficult to properly mix the zinc glycerolate into this HDPE blend. The use of the dispersion aid/synergist improves the water vapor transmission rate (WVTR) of polyethylene film (in comparison to barrier films made with zinc glycerolate, in the absence of the dispersion aid/synergist). The resulting barrier films are suitable for the preparation of packaging for dry foods such as crackers and breakfast cereals.

Barrier film composition

The present disclosure relates to systems including a ternary stabilization package that contains a first phosphite, a second phosphite and a primary antioxidant is used in combination with a polyethylene that is polymerized with a mixed catalyst system that contains two different types of catalysts. In some embodiments the stabilized polyethylene exhibits improved color performance.

Stabilization of mixed catalyst polyethylene

In some embodiments, this disclosure provides a process for the stabilization of thermoplastic polyolefins during melt processing operations. In some embodiments, the stabilizer package disclosed herein is 'phenol free' and contains at least one solid aryl monophosphite and a specific liquid phosphite. The processes disclosed herein are suitable for the manufacture of polyethylene film.

Mixed phosphite stabilization of polyethylene film

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 comprises at least two selected phosphite stabilizers. In some embodiments, the process is suitable for the manufacture of polyethylene film.

Phenol free stabilization of polyethylene

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.

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Calgary, Canada

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