Thick shrink film having high oxygen transmission rate

B - Operations – Transporting – 32 – B

Patent

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Details

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

Patent

CA 2517891

A multilayer film with an oxygen transmission rate of at least 10,000 cc/mil/24 hour@STP. The film is particularly suited for the packaging of fresh seafood. The film has a first neat and a second layer which serves as a high 02-transmission layer. The first layer has a thickness of from 2 to 20 percent of a total thickness of the multilayer film. The second layer comprises at least one member selected from the group consisting of: (i) ethylene/butyl acrylate copolymer, (ii) homogeneous ethylene/alpha-olefin copolymer having a density of from 0.86 to 0.91 g/cc; (iii) heterogeneous ethylene/alpha-olefin copolymer having a density of from 0.89 to 0.91 g/cc; (iv) ethylene/methyl acrylate copolymer having a methyl acrylate mer content of from 20 to 24 mole percent; (v) ethylene/vinyl acetate copolymer having a vinyl acetate mer content of from 10 to 30 mole percent; and (vi) styrene butadiene block copolymer. The film is at least 38 microns (1.5 mils) thick. The invention also pertains to a bag made from the film, as well as a packaged product utilizing the film.

L'invention concerne un film à couches multiples possédant un taux de transmission à l'oxygène d'au moins 10,000 cc/mil/24 heure@STP. Le film est particulièrement conçu pour l'emballage d'aliments d'origine marine frais. Le film comprend une première couche externe de thermoscellage et une seconde couche servant de couche de transmission à l'0¿2? élevée. L'épaisseur de la première couche représente entre 2 et 20 % de l'épaisseur totale du film à couches multiples. La seconde couche comprend au moins un élément sélectionné dans le groupe comprenant: (i) un copolymère d'éthylène/butyl acrylate, (ii) un copolymère homogène d'éthylène/alpha-oléfine à densité comprise entre 0,86 et 0,91 g/cc; (iii) un copolymère hétérogène d'éthylène/alpha-oléfine à densité comprise entre 0,89 et 0,91 g/cc; (iv) un copolymère d'éthylène/méthyl acrylate à teneur en méthyl acrylate mer comprise entre 20 et 24 mol %; (v) un copolymère d'éthylène/vinyl acétate à teneur en vinyl acétate mer comprise entre 10 et 30 mol %; et (vi) un copolymère séquencé de styrène butadiène. L'épaisseur du film est d'au moins 38 microns (1,5mils). L'invention concerne également un sac conçu à partir du film, ainsi qu'un produit emballé utilisant le film.

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