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US 4,726,984 AGranted
Oxygen barrier oriented film
AssigneeW. R. Grace & Co.
InventorGautam P. Shah
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Abstract
A coextruded multiple layer oriented film is provided which comprises a core layer of ethylene vinyl alcohol copolymer, two intermediate adhesive layers, and two outer layers of a blend of ethylene propylene copolymer and polypropylene. A preferred embodiment of the multi-layer film exhibits excellent optical properties, and shrink properties while providing high oxygen barrier especially useful in food packaging applications.
Claims10
A coextruded thermoplastic multi-layer oriented packaging shrink film comprising:
- (a) a core layer comprising ethylene vinyl alcohol copolymer;
- (b) two intermediate layers, on opposite surfaces of the core layer, comprising polymeric adhesive;
- (c) two outer layers disposed on respective surfaces of the intermediate layers, opposite the core layer, and comprising a blend of ethylene propylene copolymer and polypropylene;
- and
- (d) said film having a total thickness ranging from about 0.5 to 4 mils.
2 more elements
Dependencies are inferred from the claim text.