High modulus oxygen-permeable multilayer film, packaging...

B - Operations – Transporting – 32 – B

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B32B 27/08 (2006.01) B32B 27/32 (2006.01) B65D 65/40 (2006.01)

Patent

CA 2245678

A multilayer film has a first outer layer, an inner layer, and a second outer layer. The first outer layer comprises a homogeneous ethylene/alpha-olefin copolymer. The inner layer comprises a thermoplastic elastomer. The second outer layer comprises a second ethylene/alpha-olefin copolymer. The inner layer is between the first outer layer and the second outer layer, and is chemically different from the first outer layer and the second outer layer. The multilayer film has an O2-transmission rate of from about 500 to 50,000 cc/m2 24hr STP, and a modulus of at least 60,000 psi. The multilayer film is especially useful for the packaging of O2-sensitive products, such as produce. The high modulus of the film enhances its performance in form-fill- and-seal operations.

Un film ou pellicule multicouche possède une première couche externe, une couche interne et une seconde couche externe. La première couche externe comprend un copolymère homogène éthylène/alpha-oléfine. La couche interne comprend un élastomère thermoplastique. La seconde couche externe comprend un second copolymère éthylène/alpha-oléfine. La couche interne est placée entre la première couche externe et la seconde couche externe et elle est différente d'un point de vue chimique de la première couche externe et de la seconde couche externe. Le film multicouche possède un taux de transmission d'oxygène compris entre 500 et 50 000 cc/m<2> environ par 24 heures dans des conditions de température et de pression standard, et un module d'au moins 60 000 psi. Le film multicouche est particulièrement utile pour l'emballage de produits sensibles à l'oxygène, tels que les légumes. Le module élevé du film améliore son comportement au cours des opérations de formage-remplissage-fermeture hermétique.

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