Packaging films containing coextruded polyester and nylon layers
AssigneeCurwood, Inc.
InventorAndrew John Lischefski
Life of this patent
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Abstract
Multilayer coextruded thermoformable structures for packaging film applications. The multilayer structures having at least a first layer comprising polyethylene terephthalate, a second layer of a first adhesive comprising a blend of at least an acrylate-based resin and either a modified polyolefin or a modified acrylate-based resin; a third layer of a thermoplastic oxygen barrier. The thermoplastic oxygen barrier may comprise ethylene/vinyl alcohol copolymer (EVOH), polyvinylidene chloride, or polyamide, preferably, a polyamide blend containing between 1-29% amorphous polyamide. The present invention may further comprise at least 5-7 thermoplastic layers.
Claims90
A coextruded multilayered thermoformable film comprising:
- (a) a first layer comprising polyethylene terephthalate, wherein said first layer is an exterior-surface layer of said film;
- (b) a second layer of a first adhesive comprising a blend of at least an acrylate-based resin and either a modified polyolefin or a modified acrylate-based resin;
- and
- (c) a third layer of a thermoplastic material;
- wherein said second layer is adhered to said first layer and to said third layer.
A coextruded multilayered thermoformable film comprising:
- (a) a first layer comprising polyethylene terephthalate;
- wherein said first layer is an exterior-surface layer of said film;
- (b) a second layer of a first adhesive comprising a blend of at least an acrylate-based resin and either a modified polyolefin or a modified acrylate-based resin;
- (c) a third layer of a thermoplastic material;
- wherein said second layer is adhered to said first layer and to said third layer;
- (d) a fourth layer of a thermoplastic material;
- and
- (e) a fifth layer of a thermoplastic material.
A coextruded multilayered thermoformable film comprising:
- (a) a first layer comprising polyethylene terephthalate;
- wherein said first layer is an exterior-surface layer of said film;
- (b) a second layer of a first adhesive comprising a blend of at least an acrylate-based resin and either a modified polyolefin or a modified acrylate-based resin;
- (c) a third layer of a thermoplastic material;
- wherein said second layer is adhered to said first layer and to said third layer;
- (d) a fourth layer of a thermoplastic material;
- (e) a fifth layer of a thermoplastic material;
- (f) a sixth layer of a thermoplastic material;
- and
- (g) a seventh layer of a thermoplastic material.
Dependencies are inferred from the claim text.