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Ionomer for food wrap has enhanced permeability.

A novel family of ionomers boasts breakthrough performance for fresh food packaging that requires selective high permeability to oxygen and moisture. Developed by DuPont Packaging & Industrial Polymers, Wilmington, Del., Selar VP resins are based on a patented technology of highly neutralized ionic compositions of ethylene ionomers modified with fatty-acid salts. Thirty percent of the resin's content is from renewable sources. It can be processed on conventional cast or blown film equipment.

The first of the new resins boasts high oxygen transmission rates (OTR) plus tight cling to product, good machineability, and ease of cutting. Applications include multilayer films for premade bags, form-fill-seal, and vacuum skin packaging of fresh produce and fish. These resins are also well-suited to monolayer thermoformed packages for single-serve fresh-fruit cups.

Properties include a 0.94 g/cc density, oxygen permeation value (OPV) of 1300 cc-mil/100 in. (2)-day, secant flex modulus of 21,000 psi, and tensile strength of 24,000 psi. The modified ionomers have improved heat resistance, so they can be used as the outer layer of a multilayer structure, and are stiffer than other materials with high OTR, such as EVA, EMA, and mLLDPE (especially at lower densities). Tel: (302) 999-5912 *

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Title Annotation:KEEPING UP WITH: Materials
Publication:Plastics Technology
Date:Mar 1, 2007
Previous Article:Stiff, tough, clear PP for rigid packaging.
Next Article:LCP offers increased heat resistance.

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