US2006105166A1PendingUtilityA1

Breathable packaging film having enhanced thermoformability

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Assignee: LISCHEFSKI ANDREW JPriority: Nov 17, 2004Filed: Nov 17, 2004Published: May 18, 2006
Est. expiryNov 17, 2024(expired)· nominal 20-yr term from priority
Inventors:Andrew J. LischefskiKevin Nelson
Y10T428/2826Y10T428/2817Y10T428/2878Y10T428/269Y10T428/31797B32B 2307/406Y10T428/31938Y10T428/27Y10T428/26Y10T428/31909Y10T428/28Y10T428/31786Y10T428/31913B32B 2307/724Y10T428/31928Y10T428/31855Y10T428/31935B32B 2307/738B32B 2250/24B32B 27/08B32B 27/308Y10T428/2813B32B 2439/70B32B 27/36B32B 27/32
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Claims

Abstract

The present invention describes thermoformable coextruded film suitable for use in packaging applications having at least a first polymeric layer serving as an outermost exterior-film layer and comprising a cycloaliphatic polyester, an aromatic polyester or blends thereof; a second polymeric layer serving as a thermoforming-assist layer and comprising a polyolefin; and a third polymeric layer serving as an innermost exterior-film layer and comprising a heat-sealing polyolefinic material. The films of the present invention are oxygen-permeable in that they exhibit an oxygen transmission rate of between 2-1000 cm 3 /100 in 2 /24 h.atm.

Claims

exact text as granted — not AI-modified
1 . A thermoformable coextruded packaging film comprising: 
 (a) at least a first polymeric layer, a second polymeric layer, and a third polymeric layer;    (b) wherein said first polymeric layer is an outermost exterior-film layer and comprises a material selected from the group consisting of cycloaliphatic polyesters, polyethylene terephthalate (PET), polyethylene terephthalate glycol (PETG), polypropylene terephthalate (PPT), polybutylene terephthalate (PBT) and blends thereof.;    (c) wherein said second polymeric layer comprises polypropylene or cross-linked polyethylene;    (d) wherein said third polymeric layer is an innermost exterior-film layer comprising a heat-sealable polyolefin;    (e) wherein said film has an oxygen transmission rate at 73° C. and 0% R.H. of between 2-1000 cm 3 /100 in 2 /24 h. (31-15,500 cm 3 /m 2 /24 h.) as measured in accordance with ASTM D-3985-02 test method; and    (f) wherein said film comprises an unrestrained linear thermal shrinkage at 80° C. of 0-20% in both the machine and transverse direction as measured in accordance with ASTM D-2732-96 test method.    
   
   
       2 . A thermoformable coextruded packaging film according to  claim 1 , wherein said film is formed by blown film coextrusion.  
   
   
       3 . A thermoformable coextruded packaging film according to  claim 1 , wherein said first polymeric layer, said second polymeric layer, and said third polymeric layer are free of polyamide.  
   
   
       4 . A thermoformable coextruded packaging film according to  claim 1 , wherein said film comprises an unrestrained linear thermal shrinkage at 80° C. of 0-10% in both the machine and transverse direction as measured in accordance with ASTM D-2732-96 test method.  
   
   
       5 . A thermoformable coextruded packaging film according to  claim 4 , wherein said film comprises an unrestrained linear thermal shrinkage at 80° C. of 0-5% in both the machine and transverse direction as measured in accordance with ASTM D-2732-96 test method.  
   
   
       6 . A thermoformable coextruded packaging film according to  claim 1 , wherein said film comprises a gloss value at 45° of at least 60% as measured in accordance ASTM D-2457-03 test method.  
   
   
       7 . A thermoformable coextruded packaging film according to  claim 1 , wherein said film comprises a haze value of less than 20% as measured in accordance with ASTM D-1003-00 test method.  
   
   
       8 . A thermoformable coextruded packaging film according to  claim 1 , wherein said film has an oxygen transmission rate at 73° C. and 0% R.H. of between 10-1000 cm 3 /100 in 2 /24 h. (155-15,500 cm 3 /m 2 /24 h.) as measured in accordance with ASTM D-3985-02 test method.  
   
   
       9 . A thermoformable coextruded packaging film according to  claim 1 , wherein said film has an oxygen transmission rate at 73° C. and 0% R.H. of between 20-1000 cm 3 /100 in 2 /24 h. (310-15,500 cm 3 /m 2 /24 h.) as measured in accordance with ASTM D-3985-02 test method.  
   
   
       10 . A thermoformable coextruded packaging film according to  claim 1 , wherein said third polymeric layer comprises polyethylene.  
   
   
       11 . A thermoformable multilayer packaging film according to  claim 1 , wherein said film further comprises a fourth polymeric layer disposed between said first and second polymeric layers.  
   
   
       12 . A thermoformable coextruded packaging film according to  claim 11 , wherein said film further comprises a fifth polymeric layer disposed between said second and third polymeric layers.  
   
   
       13 . A thermoformable coextruded packaging film according to  claim 11 , wherein said fourth polymeric layer comprises a polyalkyl acrylate copolymer or blend thereof.  
   
   
       14 . A thermoformable coextruded packaging film according to  claim 13 , wherein said polyalkyl acrylate copolymer comprises an ethylene/alkyl acrylate copolymer or blends thereof.  
   
   
       15 . A thermoformable coextruded packaging film according to  claim 14 , wherein said ethylene/alkyl acrylate copolymers comprise a material selected from the group consisting of ethylene/methyl acrylate copolymer (E/MA), ethylene/ethyl acrylate copolymer (E/EA), ethylene/butyl acrylate copolymer (E/BA), and ethylene/methyl methacrylate copolymer (E/MMA).  
   
   
       16 . A thermoformable coextruded packaging film according to  claim 12 , wherein said fifth polymeric layer comprises a material selected from the group consisting of polypropylene, polyethylene, anhydride-modified polyolefin and blends thereof.  
   
   
       17 . A thermoformable coextruded packaging film according to  claim 12 , wherein said film further comprises a sixth polymeric layer and a seventh polymeric layer.  
   
   
       18 . A thermoformable coextruded packaging film according to  claim 17 , wherein said sixth and seventh polymeric layers each comprises a material selected from the group consisting of polyethylene, polypropylene and blends thereof.  
   
   
       19 . A thermoformable coextruded packaging film according to  claim 1 , wherein said film has a thickness range between 0.8-15 mils (20.32-381 μm).  
   
   
       20 . A thermoformable coextruded packaging film according to  claim 19 , wherein said film has a thickness range between 0.8-10 mils (20.32-254 μm).  
   
   
       21 . A thermoformable coextruded packaging film according to  claim 20 , wherein said film has a thickness range between 0.8-8.0 mil (20.32-203.2 μm).  
   
   
       22 . A thermoformable coextruded packaging film according to  claim 1 , wherein said film forms a package or a portions thereof.  
   
   
       23 . A thermoformable coextruded packaging film comprising: 
 (a) at least a first polymeric layer, a second polymeric layer, a third polymeric layer, a fourth polymeric layer, and a fifth polymeric layer;    (b) wherein said first polymeric layer is an outermost exterior-film layer and comprises a material selected from the group consisting of cycloaliphatic polyesters, polyethylene terephthalate (PET), polyethylene terephthalate glycol (PETG), polypropylene terephthalate (PPT), polybutylene terephthalate (PBT) and blends thereof.;    (c) wherein said second polymeric layer is directly contacting said first and third polymeric layers and comprises an polyalkyl acrylate copolymer or blend thereof;    (d) wherein said third polymeric layer is directly contacting said second and fourth polymeric layers and comprises either polypropylene or cross-linked polyethylene;    (e) wherein said fourth polymeric layer is directly contacting said third and fifth polymeric layers and comprises a material selected from the group consisting of polyethylene, polypropylene, anhydride-modified polyolefin and blends thereof;    (f) wherein said fifth polymeric layer is directly contacting said fourth and sixth polymeric layers and comprises a heat-sealable polyolefin;    (g) wherein said film has an oxygen transmission rate at 73° C. and 0% R.H. of between 2-1000 cm 3 /100 in 2 /24 h. (31-15,500 cm 3 /m 2 /24 h.) as measured in accordance with ASTM D-3985-02 test method; and    (h) wherein said film comprises an unrestrained linear thermal shrinkage at 80° C. of 0-5% in both the machine and transverse direction as measured in accordance with ASTM D-2732-96 test method.    
   
   
       24 . A thermoformable coextruded packaging film according to  claim 23 , wherein said film is formed by blown film coextrusion.  
   
   
       25 . A thermoformable coextruded packaging film comprising: 
 (a) at least a first polymeric layer, a second polymeric layer, a third polymeric layer, a fourth polymeric layer, a fifth polymeric layer, a sixth polymeric layer, and a seventh polymeric layer;    (b) wherein said first polymeric layer is an outermost exterior-film layer and comprises a material selected from the group consisting of cycloaliphatic polyesters, polyethylene terephthalate (PET), polyethylene terephthalate glycol (PETG), polypropylene terephthalate (PPT), polybutylene terephthalate (PBT) and blends thereof.;    (c) wherein said second polymeric layer is directly contacting said first and third polymeric layers and comprises an polyalkyl acrylate copolymer of blend thereof;    (d) wherein said third polymeric layer is directly contacting said second and fourth polymeric layers and comprises either polypropylene or cross-linked polyethylene;    (e) wherein said fourth polymeric layer is directly contacting said third and fifth polymeric layers and comprises a material selected from the group consisting of polyethylene, polypropylene and blends thereof;    (f) wherein said fifth polymeric layer is directly contacting said fourth and sixth polymeric layers and comprises a material selected from the group consisting of polyethylene, polypropylene and blends thereof;    (g) wherein said sixth polymeric layer is directly contacting said fifth and seventh polymeric layers and comprises a material selected from the group consisting of polyethylene, polypropylene, anhydride-modified polyolefin and blends thereof;    (h) wherein said seventh polymeric layer is an innermost exterior-film layer comprising a heat-sealable polyolefin;    (i) wherein said film has an oxygen transmission rate at 73° C. and 0% R.H. of between 2-1000 cm 3 /100 in 2 /24 h. (31-15,500 cm 3 /m 2 /24 h.) as measured in with ASTM D-3985-02 test method; and    (j) wherein said film comprises an unrestrained linear thermal shrinkage at 80° C. of 0-5% in both the machine and transverse direction as measured in accordance with ASTM D-2732-96 test method.    
   
   
       26 . A thermoformable coextruded packaging film according to  claim 25 , wherein said film is formed by blown film coextrusion.  
   
   
       27 . A thermoformable coextruded packaging film according to  claim 25 , wherein said first polymeric layer, said second polymeric layer, said third polymeric layer, said fourth polymeric layer, said fifth polymeric layer, said sixth polymeric layer, and said seventh polymeric layer are free of polyamide.  
   
   
       28 . A thermoformable coextruded packaging film according to  claim 25 , wherein said film comprises a gloss value at 45° of at least 60% as measured in accordance ASTM D-2457 test method.  
   
   
       29 . A thermoformable coextruded packaging film according to  claim 25 , wherein said film comprises a haze value of less than 20% as measured in accordance with ASTM D-1003-00 test method.  
   
   
       30 . A thermoformable coextruded packaging film according to  claim 25 , wherein said film has an oxygen transmission rate at 73° C. and 0% R.H. of between 10-1000 cm 3 /100 in 2 /24 h. (155-15,500 cm 3 /m 2 /24 h.) as measured in accordance with ASTM D-3985-02 test method.  
   
   
       31 . A thermoformable coextruded packaging film according to  claim 30 , wherein said film has an oxygen transmission rate at 73° C. and 0% R.H. of between 20-1000 cm 3 /100 in 2 /24 h. (310-15,500 cm 3 /m 2 /24 h.) as measured in accordance with ASTM D-3985-02 test method.  
   
   
       32 . A thermoformable coextruded packaging film according to  claim 25 , wherein said fourth polymeric layer comprises a polyalkyl acrylate copolymer or blend thereof.  
   
   
       33 . A thermoformable coextruded packaging film according to  claim 32 , wherein said polyalkyl acrylate copolymer comprises an ethylene/alkyl acrylate copolymers or blends thereof.  
   
   
       34 . A thermoformable coextruded packaging film according to  claim 33 , wherein said ethylene/alkyl acrylate copolymers comprise a material selected from the group consisting of ethylene/methyl acrylate copolymer (E/MA), ethylene/ethyl acrylate copolymer (E/EA), ethylene/butyl acrylate copolymer (E/BA), and ethylene/methyl methacrylate copolymer (E/MMA).  
   
   
       35 . A thermoformable coextruded packaging film according to  claim 25 , wherein said anhydride-modified polyolefin comprise an anhydride modified-polyethylene.  
   
   
       36 . A thermoformable coextruded packaging film according to  claim 25 , wherein said heat-sealable polyolefin comprises polyethylene.  
   
   
       37 . A thermoformable coextruded packaging film according to  claim 25 , wherein said film has a thickness range between 0.8-15 mils (20.32-381 μm).  
   
   
       38 . A thermoformable coextruded packaging film according to  claim 37 , wherein said film has a thickness range between 0.8-10 mils (20.32-254 μm).  
   
   
       39 . A thermoformable coextruded packaging film according to  claim 38 , wherein said film has a thickness range between 0.8-8.0 mil (20.32-203.2 μm).  
   
   
       40 . A thermoformable coextruded packaging film according to  claim 25 , wherein said film forms a package or a portion thereof.

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