Packaging laminates and articles made therefrom
AssigneeCurwood, Inc.
InventorsAndrea Schell, Christopher Harvey
Life of this patent
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Abstract
Film laminates for packaging applications having at least two polymer layers which are formed together as a coextruded blown film such that the first polymer layer is a surface layer relative to the film and comprises a heat-sealable material having a melt index of at least 20 g/10 min. The first polymer layer of the coextruded film has a thickness A and the film has a total thickness B, such that the relative values of A and B satisfy the relationship A/B≧0.3. The present invention further provides food packages formed from these film laminates.
Claims40
A multi-layered thermoplastic film laminate for packaging applications comprising:
- a) at least a first polymer layer and a second polymer layer;
- b) wherein said first and second polymer layers are formed together as a blown coextruded film;
- c) wherein said first polymer layer is a surface layer relative to said film which comprises a heat-sealable resin having a melt index of at least 20 g/10 min. as measured in accordance with ASTM D-1238 test method at 190° C./2.16 kg;
- and
- d) wherein said first polymer layer comprises a thickness A and said film comprises a total thickness B such that the relative values of A and B satisfy the relationship A/B>0.3.
A multi-layered thermoplastic film laminate for packaging applications comprising:
- a) at least a first polymer layer and a second polymer layer;
- b) wherein said first and second polymer layers are formed together as a blown coextruded film;
- c) wherein said first polymer layer is a surface layer relative to said film which comprises a heat-sealable resin having a melt index of at least 20 g/10 min. as measured in accordance with ASTM D-1238 test method at 190° C./2.16 kg;
- wherein said heat-sealable resin comprises a material selected from the group consisting of acrylate-based resin, acrylic acid-based resin, ionomer, ethylene/α-olefin copolymer (E/AO), and blends thereof;
- and
- d) wherein said first polymer layer comprises a thickness A and said film comprises a total thickness B such that the relative values of A and B satisfy the relationship A/B>0.3.
A multi-layered thermoplastic film laminate for packaging applications comprising:
- a) at least a first polymer layer;
- a second polymer layer, a third polymer layer, a fourth polymer layer, and a fifth polymer layer;
- b) wherein said first, second, third, fourth, and fifth polymer layers are formed together as a blown coextruded film;
- c) wherein said first polymer layer is a surface layer relative to said film which comprises a heat-sealable resin having a melt index of at least 20 g/10 min. as measured in accordance with ASTM D-1238 test method at 190° C./2.16 kg;
- wherein said heat-sealable resin comprises a material selected from the group consisting of acrylate-based resin, acrylic acid-based resin, ionomer, ethylene/α-olefin copolymer (E/AO), and blends thereof;
- d) wherein said first polymer layer comprises a thickness A and said film comprises a total thickness B such that the relative values of A and B satisfy the relationship A/B>0.3;
- e) wherein said second polymer layer comprises nylon;
- wherein said second polymer layer is disposed between said first and third polymer layers;
- f) wherein said third polymer layer comprises an oxygen barrier material selected from the group consisting of ethylene/vinyl alcohol copolymer (E/VOH), polyvinylidene chloride copolymer (PVDC), and blends thereof;
- said third is disposed between said second and fourth polymer layers;
- g) wherein said fourth polymer layer comprises nylon;
- wherein said fourth polymer layer is disposed between said third and fifth polymer layers;
- and
- h) wherein said fifth polymer layer comprises polyolefin.
Dependencies are inferred from the claim text.