Multi-Layered Assembly With Tight Peel Control

Abstract

Embodiments disclosed herein provide for multi-layered assemblies comprising a carrier having opposed sides; a heat sealable layer disposed on at least a portion of one of said sides of the carrier, said heat sealable layer comprising a partially salt neutralized ionomer; and a polymeric film comprising polyurethane and having opposed sides, wherein one of said sides of the polymeric film in at least in partial contact with said heat sealable layer, methods of making the same as well as other variations.

1 .- 68 . (canceled) 
     
     
         69 . A multi-layered assembly comprising:
 a carrier having opposed sides;   a heat sealable layer disposed on at least a portion of one of said sides of the carrier, said heat sealable layer comprising a partially salt neutralized ionomer; and   a polymeric film comprising polyurethane and having opposed sides, wherein one of said sides of the polymeric film is in at least partial contact with said heat sealable layer; and   wherein said polyurethane comprises any of an aromatic polyether urethane, an aliphatic polyether urethane, a poly (ether ester) block copolymer, or a poly (ether ester) block terpolymer.   
     
     
         70 . The multi-layered assembly of  claim 69 , wherein the polymeric film comprises a pressure sensitive adhesive layer disposed on a side thereof opposed to the side that is in at least partial contact with said heat sealable layer. 
     
     
         71 . The multi-layered assembly of  claim 70 , further comprising a protective release liner disposed on the pressure sensitive adhesive layer. 
     
     
         72 . The multi-layered assembly of  claim 69 , wherein said partially salt neutralized ionomer exhibits a salt neutralization level in a range of about 5% to about 70%. 
     
     
         73 . The multi-layered assembly of  claim 69 , wherein said salt comprises any of a sodium, a potassium, a magnesium, a calcium, or a zinc salt. 
     
     
         74 . The multi-layered assembly of  claim 69 , wherein said partially salt neutralized ionomer comprises a partially salt neutralized ethylene acrylic acid copolymer. 
     
     
         75 . The multi-layered assembly of  claim 74 , wherein said partially salt neutralized ethylene-acrylic acid copolymer exhibits a salt neutralization level in range of about 5% to about 70%. 
     
     
         76 . The multi-layered assembly of  claim 70 , wherein said heat sealable layer exhibits an FTIR spectrum exhibiting a peak at about 1700 cm −1  and a peak in the range of about 1500 to about 1560 cm −1 . 
     
     
         77 . The multi-layered assembly of  claim 76 , wherein a ratio of the height of the peak at about 1700 cm −1  to the height of the peak in the range of about 1500 to about 1560 cm −1  is in a range from about 20 to about 0.5. 
     
     
         78 . The multi-layered assembly of  claim 69 , wherein said peel force varies by less than 25% when said assembly is exposed to a temperature of about 50° C. for 24 hours. 
     
     
         79 . The multi-layered assembly of  claim 69 ,
 wherein said peel force varies by less than 25% after said assembly is subjected to ethylene oxide sterilization or by less than 10% after said assembly is subjected to gamma ray sterilization.   
     
     
         80 . A collection of multi-layered assemblies, comprising
 a plurality of multi-layered assemblies each of which comprises a carrier having opposed sides,   a heat sealable layer disposed on at least a portion of one of said sides of the carrier, said heat sealable layer comprising a partially salt neutralized ionomer, and   a polymeric film comprising polyurethane and having opposed sides, wherein one of said sides of the polymeric film is in at least partial contact with said heat sealable layer,   wherein said polyurethane comprises any of an aromatic polyether urethane, an aliphatic polyether urethane, a poly (ether ester) block copolymer, or a poly (ether ester) block terpolymer; and   wherein the variation in peel force among said assemblies as measured by 3 times the standard deviation as a percent of the average peel force is less than 30%.   
     
     
         81 . The multi-layered assembly of  claim 80 , wherein said peel force is in a range of about 200 grams/inch to about 500 grams/inch. 
     
     
         82 . The multi-layered assembly of  claim 81 , wherein said partially salt neutralized ionomer comprises a partially salt neutralized ethylene acrylic acid copolymer.