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US 4,788,105 AGranted
Oxygen barrier laminates
AssigneeW. R. Grace & Co.
InventorsWalter B. Mueller, Henry G. Schirmer
Life of this patent
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Abstract
A thermoplastic laminate comprises an oxygen barrier film, and a second film adhered to the oxygen barrier film and comprising a polymeric material which adds heat resistance and stiffness to the laminate. Such materials are preferably polycarbonate, polyamide, polypropylene, and polyester.
Claims3
A thermoplastic laminate comprising:
- (a) a first film comprising a first layer of an ethylene vinyl acetate copolymer, a second layer of a linear low density polyethylene, a third layer of a polymeric adhesive, a fourth layer of a polymeric material having an oxygen transmission rate of less than 100 cubic centimeters per square meter in 24 hours at 73 degrees centigrade, a fifth layer as in said third layer, and a sixth bonding layer of an ethylene vinyl acetate copolymer;
- and
- (b) a second film adhered to the first film comprising a polymeric material selected from the group consisting of polyester, polyamide, polypropylene, and polycarbonate.
Dependencies are inferred from the claim text.