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US 5,698,279 AGranted
Heat shrinkable nylon food casing having a functionalized ethylenic polymer core layer
AssigneeViskase Corporation
InventorStephen James Vicik
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Abstract
Tubular, biaxially stretched, heat shrinkable multilayer film food casings comprising inner and outer polyamide layers on either side of a core layer predominantly of one or more ethylenic polymers having a functional moiety selected from the group of esters, anhydrides, and carboxylic acids, and a coextrusion process for making the film.
Claims27
A seamless tubular, biaxially stretched, heat shrinkable, multilayer film, food casing having inner and outer surfaces, said casing comprising:
- (a) an inner layer comprising a polyamide;
- (b) a water vapor barrier core layer comprising at least 50% by weight of ethylene vinyl acetate copolymer having at least 70 weight % ethylene units blended with at least 10% by weight of ethylene methacrylic acid copolymer;
- and
- (c) an outer oxygen barrier layer comprising a polyamide;
- wherein said casing comprising three polymeric layers (a),(b), and (c) wherein said core layer (b) is between layers (a) and (c) and in direct adhering contact with said layers (a) and (c), with said inner layer (a) being continuous over said inner surface of said tubular casing, and said multilayer film has a shrinkage value of at least 10% in at least one direction at 90.degree. C.
2 more elements
Dependencies are inferred from the claim text.