Easy-open reclosable films having an interior frangible interface and articles made therefrom
First Claim
1. A peelable resealable multilayer film comprising:
- at least a first thermoplastic layer, a second thermoplastic layer and a third thermoplastic layer;
wherein said first layer is an exterior film layer and comprises a homopolymer or copolymer selected from the group consisting of polyolefin, ionomer and blends thereof;
wherein said second layer is in direct contact with and bonded to both said first and third layers;
wherein said second layer comprises a tacky pressure-sensitive adhesive;
wherein said third layer comprises cyclic olefin copolymer;
wherein said bond between said second and third layers comprises a peelable resealable interface having a first interfacial peel strength “
A” and
a second interfacial peel strength “
B”
such that the value of A is less than 3500 gram-force/inch (1350 newton/meter) as measured in accordance with ASTM F-904 test method when peeled from a second thermoplastic film to which said film has been heat-sealed, and the value of B is at least 330 gram-force/inch (127 newton/meter) as measured in accordance with ASTM F-904 when peeled from and resealed to said second film;
and wherein the relative values of A and B satisfy the relationship A≧
B.
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Accused Products
Abstract
The present invention relates to peelable resealable multilayer films which include at least a first polymer layer, a second polymer layer of pressure-sensitive adhesive in direct contact with and bonded to both the first and third layers. The bond formed between the second and third layers includes a peelable resealable interface having a first interfacial peel strength, A, and a second interfacial peel strength, B. The peelable resealable interface includes a first interfacial peel strength, A, having a value of less than 3500 gram-force/inch (1350 newton/meter) as measured in accordance with ASTM F-904-98 test method when the films of the present invention are peeled from a second thermoplastic film to which the film has been heat-sealed. The second interfacial peel strength, B, has a value of at 400 gram-force/inch (154 newton/meter) as measured in accordance with ASTM F-904-98 test method when the films are peeled from and re-adhered to a second film.
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Citations
12 Claims
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1. A peelable resealable multilayer film comprising:
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at least a first thermoplastic layer, a second thermoplastic layer and a third thermoplastic layer; wherein said first layer is an exterior film layer and comprises a homopolymer or copolymer selected from the group consisting of polyolefin, ionomer and blends thereof; wherein said second layer is in direct contact with and bonded to both said first and third layers;
wherein said second layer comprises a tacky pressure-sensitive adhesive;wherein said third layer comprises cyclic olefin copolymer; wherein said bond between said second and third layers comprises a peelable resealable interface having a first interfacial peel strength “
A” and
a second interfacial peel strength “
B”
such that the value of A is less than 3500 gram-force/inch (1350 newton/meter) as measured in accordance with ASTM F-904 test method when peeled from a second thermoplastic film to which said film has been heat-sealed, and the value of B is at least 330 gram-force/inch (127 newton/meter) as measured in accordance with ASTM F-904 when peeled from and resealed to said second film;and wherein the relative values of A and B satisfy the relationship A≧
B. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification