Multilayer, coextruded, biaxially stretched high-barrier plastic casing
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United States of America Patent
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Feb 11, 2003
Grant Date -
N/A
app pub date -
Sep 11, 2000
filing date -
Sep 14, 1999
priority date (Note) -
Expired
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Abstract
A multilayered, coextruded tubular biaxially stretched casing, having oxygen and water vapor barrier properties plus reduced adhesion to contents, e.g., foodstuffs, contained within the casing, is disclosed. The tubular casing has five layers in the order of A.vertline.B.vertline.C.vertline.D.vertline.E. Outer layer A, contains as its principal component at least one polyamide. Layer B has oxygen barrier properties, and may be composed of a substantially hydrolyzed copolymer of ethylene and vinyl acetate. The core layer C contains as its principal component at least one polyamide. Layer D contains a modified polyolefin. Inner layer E (i.e., the layer that is in contact with the contents of the tubular casing) is a water vapor barrier layer, that contains as its principal component at least one member selected from the group consisting of homopolyolefin and copolyolefin. The tubular casing is useful for encasing foodstuffs, such as pasty or liquid foodstuffs.
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