Packaging material for long-term storage of shelf stable food products and method of making same
AssigneeW. R. Grace & Co., Cryovac Div.
InventorsRandal M. Koteles, John G. Bradfute
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Abstract
A thermoplastic laminate suitable for long-term storage of shelf stable food products includes a first substrate comprising a layer of ethylene vinyl alcohol copolymer and a layer of a polyamide; and a second substrate bonded to the first substrate and comprising a vinylidene chloride copolymer. Polyamide may be included in a separate and distinct third substrate disposed between the first and second substrates.
Claims16
A thermoplastic laminate comprising:
- (a) a first substrate comprising a layer of ethylene vinyl alcohol copolymer, a layer of a polyamide, and an outer layer of linear low density polyethylene;
- and
- (b) a second substrate bonded to the first substrate and comprising a vinylidene chloride copolymer, and an outer layer of linear low density polyethylene.
A thermoplastic laminate comprising:
- (a) a first substrate comprising a layer of an ethylene vinyl alcohol copolymer and a layer of a polyamide;
- (b) a second substrate comprising a vinylidene chloride copolymer;
- and
- (c) a third substrate disposed between and bonded by a lamination adhesive to the first and second substrates and comprising a polyamide.
A process for making a thermoplastic laminate comprising:
- (a) coextruding a first substrate comprising a layer of ethylene vinyl alcohol, a layer of a polyamide, and an outer layer of linear low density polyethylene;
- (b) extruding a second substrate comprising a vinylidene chloride copolymer and an outer layer of linear low density polyethylene;
- and
- (c) adhering the first substrate to the second substrate.
A process for making a thermoplastic laminate comprising:
- (a) extruding a first substrate comprising a layer of an ethylene vinyl alcohol copolymer and a layer of a polyamide;
- (b) extruding a second substrate comprising a vinylidene chloride copolymer;
- (c) extruding a third substrate comprising a polyamide;
- and
- (d) adhering the first and second substrates to opposite surfaces of the third substrate by means of a lamination adhesive.
Dependencies are inferred from the claim text.