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US 5,843,581 AGranted
Barrier blend and food packaging film containing the blend
AssigneeCryovac, Inc.
InventorsMario Paleari, Tito Fornasiero
Life of this patent
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Abstract
A copolymer blend comprising vinylidene chloride-vinyl chloride copolymer, vinylidene chloride-methyl acrylate copolymer or a mixture thereof, from 2 to 20% by weight of CO-modified ethylene vinyl acetate copolymer or CO-modified ethylene alkyl acrylate copolymer and preferably up to 5%, of a plasticizer and/or stabiliser, relative to the total weight of the blend is useful as a barrier layer in a multi-layer film for packaging food such as cheese. A multi-layer film comprising such a blend, a method of producing such a blend or multi-layer film and a package or bag formed from the film.
Claims20
A film comprising:
- a) an abuse-resistant layer;
- b) a heat-sealable layer;
- and
- c) disposed between said abuse-resistant layer and said heat-sealable layer, a barrier layer comprising
- 1) a vinylidene chloride/vinyl chloride copolymer, a vinylidene chloride/methyl acrylate copolymer, or a mixture of the foregoing,
- 2) based on 100 parts of said copolymer, from 2 to 20 parts by weight of a terpolymer including mer units derived from ethylene, carbon monoxide, and either vinyl acetate or a C.sub.1 -C.sub.4 alkyl acrylate, and
- 3) based on 100 parts of said copolymer, up to about 5 parts by weight of a liquid plasticizer, said film having a carbon dioxide transmission rate greater than the oxygen transmission rate of said film.
4 more elements
Dependencies are inferred from the claim text.