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Tear resistant multilayer films and articles incorporating such films

  • US 5,427,842 A
  • Filed: 05/27/1994
  • Issued: 06/27/1995
  • Est. Priority Date: 10/01/1992
  • Status: Expired due to Term
First Claim
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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%.

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