Article comprising film having polyamide sealant, polyamide...

B - Operations – Transporting – 32 – B

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Details

B32B 27/28 (2006.01) B32B 27/08 (2006.01) B32B 27/34 (2006.01) B65D 65/40 (2006.01) B65D 81/34 (2006.01)

Patent

CA 2262799

An article, such as a bag, pouch, or casing, is made from a multilayer film (10) which has: (a) a first layer (12), which is an outer film layer, comprising a polyamide having a melting point of from about 250 °F to 400 °F, the first layer (12) having a thickness of less than about 18 percent, based on a total thickness of the multilayer film; (b) a second layer (14) comprising at least one member selected from the group consisting of polyamide 6, polyamide 9, polyamide 10, polyamide 11, polyamide 12, polyamide 66, polyamide 610, polyamide 612, polyamide 6I, polyamide 6T, polyamide 69, and copolymers thereof, the second layer (14) having a thickness of from about 3 to 30 percent of the total thickness of the multilayer film; and (c) a third layer (16) which serves as an O2-barrier layer and comprises at least one member selected from the group consisting of ethylene/vinyl alcohol copolymer, polyvinylidene chloride, and polyalkylene carbonate. The first layer (12) of the film is sealed to itself. The article is suitable for use as a packaging film to be used for cook-in end use. The film provides the article with enhanced sealing and toughness properties. Also disclosed are a bag comprising this multilayer film, as well as a packaged product comprising this multilayer film.

La présente invention concerne un article, tel qu'un sac, un sachet ou une boîte, fait d'un film multicouche (10) comportant: (a) une première couche (12), qui est une couche de film extérieur, faite d'un polyamide dont le point de fusion se situe environ entre 250 DEG F (120 DEG C) et 400 DEG F (200 DEG C), l'épaisseur de la première couche (12) représentant moins d'environ 18 % de l'épaisseur totale du film multicouche; (b) une deuxième couche (14) comportant au moins un élément appartenant au groupe des polyamide 6, polyamide 9, polyamide 10, polyamide 11, polyamide 12, polyamide 66, polyamide 610, polyamide 612, polyamide 61, polyamide 6T, polyamide 69 et certains de leurs copolymères, l'épaisseur de la deuxième couche (14) représentant environ 3 % à 30 % de l'épaisseur totale du film multicouche; et (c) une troisième couche (16) servant de couche barrière anti-O2 et comportant au moins un élément appartenant au groupe des copolymère d'éthylène alcool ou de vinyle alcool, chlorure de polyvinyldène et carbonate de polyalkylène. La première couche (12) du film est soudée sur elle-même. L'article convient à l'utilisation comme films d'emballage destinés à la cuisson des aliments. Ce film confère à l'article des propriétés accrues d'étanchéité et de résistance. L'invention concerne également un sac fait de ce film multicouche, ainsi qu'un produit emballé à l'aide de ce film multicouche.

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