Films useful in the modified atmosphere packaging of...

C - Chemistry – Metallurgy – 08 – J

Patent

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Details

C08J 5/18 (2006.01) B32B 27/32 (2006.01) B65D 65/40 (2006.01) B65D 81/20 (2006.01) C08L 23/08 (2006.01) C08L 23/10 (2006.01)

Patent

CA 2269125

The subject invention pertains to a film structure suitable for the packaging of perishable food, comprising at least one film layer which in turn comprises a blend of at least one homogeneous linear or substantially linear ethylene polymer and at least one polypropylene polymer, wherein the film structure is characterized as having a 2 percent secant modulus which is at least 8 percent greater than a comparable film structure prepared without the polypropylene polymer, an oxygen transmission rate of at least 700 cc(at STP)-mil/100 in.2-day-atm (0.027 cc-(at STP)-cm/cm2-day-MPa) at 25 °C. The inventive film structures exhibit an optimized balance of properties, making them especially useful in modified atmosphere packages for perishable goods. The inventive films are particularly suited for the packaging of fresh fruits, vegetables, and other perishable items which would benefit from controlled access to environmental oxygen.

L'invention concerne une structure de film appropriée pour le conditionnement de denrées périssables, comprenant au moins une couche de film, comprenant à son tour un mélange d'au moins un polymère d'éthylène homogène linéaire ou sensiblement linéaire et au moins un polymère de polypropylène. La structure de film est caractérisée par le fait qu'elle contient un module sécant de 2 %, au moins supérieur de 8 % à celui d'une structure de film comparable préparée sans le polymère de propylène, et un taux de transmission de l'oxygène d'au moins 700cc(à STP)-mil/100 in.<2>-jour-atm (0,027cc-(à STP)-cm/cm<2>-jour-MPa) à 25 DEG C. Les structures de film selon l'invention possèdent un équilibre de propriétés optimisé, ce qui les rend particulièrement utiles pour le conditionnement sous atmosphère modifiée de denrées périssables. Les films selon l'invention sont particulièrement indiqués pour le conditionnement de fruits et légumes frais ainsi que d'autres articles périssables pour lesquels un accès régulé à l'oxygène ambiant pourrait s'avérer profitable.

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