B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
B32B 7/10 (2006.01) B32B 15/04 (2006.01) B32B 15/08 (2006.01) B32B 15/20 (2006.01) B32B 27/08 (2006.01) B32B 27/32 (2006.01) H05H 1/24 (2006.01) B32B 31/16 (1995.01) B32B 31/30 (1995.01)
Patent
CA 2278791
A multi-layer film having enhanced barrier properties against transmission of oxygen and water vapor is provided. The multi-layer film includes a polypropylene base layer, with a high density polyethylene layer on at least one surface of the polypropylene base layer. The polyethylene layer includes a surface which has been subjected to plasma treatment with a hydroxyl-donating material such as a methanol. The film further includes a metal layer deposited on the plasma treated surface, such as a layer of vacuum deposited aluminum. Multi-layer films according to the present invention are particularly useful as packaging films for food products.
L'invention concerne un film multicouche ayant des propriétés de barrière améliorées vis-à-vis de la transmission d'oxygène ou de vapeur d'eau. Ce film multicouche inclut une couche de base en polypropylène comportant une couche de polypropylène de haute densité sur au moins une de ses surfaces. La couche de polypropylène présente une surface soumise à un traitement plasmatique réalisé avec un matériau à base d'hydroxyle, comme le méthanol. Le film inclut en outre une couche métallique déposée sur la surface à traitement plasmatique, telle qu'une couche d'aluminium déposée sous vide. Les films multicouche fabriqués suivant le procédé de l'invention conviennent particulièrement comme films d'emballage de produits alimentaires.
Mount Eldridge Milford III
Wagner John Robert Jr.
Gowling Lafleur Henderson Llp
Mobil Oil Corporation
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