Tear resistant multilayer films and articles incorporating such films
First Claim
1. A security control laminate comprising a first tear resistant film having a first face and a second face opposite the first face and a first layer of adhesive on the first face of the tear resistant film for bonding the security control laminate to a surface, the first tear resistant film comprising a total of more than five stiff and ductile layers situated one on the other in a parallel array, the layers occurring essentially randomly in the array, wherein (a) at least two of the layers are a stiff polyester or copolyester that has a tensile modulus greater than 200 kpsi, the layers of stiff polyester or copolyester having an average nominal thickness greater than about 1 μ
- m, and (b) at least two other layers are a ductile polymeric material that has been oriented in at least one direction, has a tensile modulus less than 200 kpsi, and has a tensile elongation greater than 50%.
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Abstract
A tear resistant film comprises more than five layers situated one on the other in a parallel array. The layers are individually selected from a stiff polyester or copolyester, a ductile polymeric material, and optionally, an intermediate material. The stiff polyester or copolyester is oriented in at least one direction. Tear resistance may be measured in a Graves area test and reflects the ability of the film to absorb energy. The films of the invention are useful in many articles including security control laminates for glazing members.
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Citations
43 Claims
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1. A security control laminate comprising a first tear resistant film having a first face and a second face opposite the first face and a first layer of adhesive on the first face of the tear resistant film for bonding the security control laminate to a surface, the first tear resistant film comprising a total of more than five stiff and ductile layers situated one on the other in a parallel array, the layers occurring essentially randomly in the array, wherein (a) at least two of the layers are a stiff polyester or copolyester that has a tensile modulus greater than 200 kpsi, the layers of stiff polyester or copolyester having an average nominal thickness greater than about 1 μ
- m, and (b) at least two other layers are a ductile polymeric material that has been oriented in at least one direction, has a tensile modulus less than 200 kpsi, and has a tensile elongation greater than 50%.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A security control laminate comprising a first tear resistant film having a first face and a second face opposite the first face and a first layer of adhesive on the first face of the tear resistant film for bonding the security control laminate to a surface, the first tear resistant film comprising a total of more than five stiff and ductile layers situated one on the other in a parallel array, the layers occurring essentially randomly in the array, wherein (a) at least two of the layers are a stiff polyester or copolyester that has a tensile modulus greater than 200 kpsi, the layers of stiff polyester or copolyester having an average nominal thickness of about 1 to 15 μ
- m, and (b) at least two other layers are a ductile polymeric material that has a tensile modulus less than 200 kpsi and a tensile elongation greater than 50%, wherein the ductile polymeric material is selected from the group consisting of ethylene copolymers, polyesters, copolyesters, polyolefins, and polyamides.
- View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. A security control laminate comprising a tear resistant film having a first face and a second face opposite the first face and a first layer of adhesive on the first face of the tear resistant film for bonding the security control laminate to a surface, the tear resistant film comprising a total of more than five stiff and ductile layers situated one on the other in a parallel array, the layers occurring essentially randomly in the array, wherein (a) at least two of the layers are a stiff polyester or copolyester that has a tensile modulus greater than 200 kpsi, the layers of stiff polyester or copolyester having an average nominal thickness of about 1 to 15 μ
- m, and (b) at least two other layers are a ductile polymeric material that has a tensile modulus less than 200 kpsi and a tensile elongation greater than 50%, the layers of ductile polymeric material having an average nominal thickness of less than 3 μ
m. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42)
- m, and (b) at least two other layers are a ductile polymeric material that has a tensile modulus less than 200 kpsi and a tensile elongation greater than 50%, the layers of ductile polymeric material having an average nominal thickness of less than 3 μ
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43. A security control laminate comprising:
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(A) a tear resistant film having a first face and a second face opposite the first face; (B) a first layer of adhesive on the first face of the tear resistant film for bonding the security control laminate to a surface; and (C) means for absorbing ultraviolet radiation, the means being either on or incorporated into a layer of the security control laminate; wherein the tear resistant film comprises a total of about thirteen alternating stiff and ductile layers situated one on the other in a parallel array, and further wherein; (a) about seven of the layers are a stiff polyester or copolyester that has a tensile modulus greater than 200 kpsi and that comprises the reaction product of (i) a dicarboxylic acid component selected from the group consisting of terephthalic acid, naphthalene dicarboxylic acid, and ester derivatives thereof, and (ii) a diol component selected from the group consisting of ethylene glycol and 1,4-butanediol, the layers of stiff polyester or copolyester having an average nominal thickness greater than about 1 μ
m;(b) about six other layers are a ductile polymeric material that has a tensile modulus less than 200 kpsi and a tensile elongation greater than 50%; (c) the tear resistant film has a Graves area in one direction of the film equal to at least about 40+0.4(x) kpsi %, wherein x is the nominal thickness of the tear resistant film in microns; (d) the tear resistant film has a Graves elongation at break of at least 20% in the tear direction of the film measured during the determination of Graves area; and (e) the tear resistant film has a tensile modulus of at least 175 kpsi in one direction of the film.
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Specification