Multilayer structures of poly(1,3 propylene 2,6-naphthalate) and poly(ethylene terephthalate)

Abstract

Multilayer shaped articles, including films, preforms and containers, and method for forming the same, having at least one layer of poly(l, 3-propylene 2,6-naphthalate) and at least one layer of poly(ethylene terephthalate). Poly(1,3-propylene 2,6-naphthalate) can be co-stretched with poly(ethylene terephthalate) to form oriented multilayer structures which have superior barrier properties. The poly(l,3-propylene 2,6-naphthalate) and poly(ethylene terephthalate) layers have good adhesion and do not require an adhesive tie layer.

1 . A multilayer film or preform comprising at least a first resin layer and a second resin layer wherein the first resin layer is formed from poly(l,3-propylene 2,6-naphthalate) and the second resin layer is formed from poly(ethylene terephthalate). 
   
   
       2 . The multilayer film according to  claim 1  wherein the film is oriented in at least one direction. 
   
   
       3 . The multilayer film of  claim 2  wherein the film is biaxially oriented. 
   
   
       4 . (canceled) 
   
   
       5 . (canceled) 
   
   
       6 . (canceled) 
   
   
       7 . (canceled) 
   
   
       8 . (canceled) 
   
   
       9 . (canceled) 
   
   
       10 . (canceled) 
   
   
       11 . (canceled) 
   
   
       12 . The multilayer film of  claim 1  wherein the first resin layer is adjacent to the second resin layer, and the first resin layer is adhered to the second resin layer with or without the aid of an adhesive tie layer. 
   
   
       13 . The multilayer film of  claim 12  wherein the first resin layer is adhered to the second resin layer with the aid of an adhesive tie layer. 
   
   
       14 . The multilayer film of  claim 12  where in the first resin layer is adhere to the second resin layer without the aid of an adhesive tie layer. 
   
   
       15 . The multilayer film of  claim 2  where in the first resin layer is adjacent to the second resin layer and the first resin layer is adhere to the second resin layer with or without the aid of an adhesive tie layer. 
   
   
       16 . The multilayer film of  claim 15  wherein the first resin layer is adhered to the second resin layer with the aid of an adhesive tie layer. 
   
   
       17 . The multilayer film of  claim 15  where in the first resin layer is adhere to the second resin layer without the aid of an adhesive tie layer. 
   
   
       18 . The multilayer film of  claim 3  where in the first resin layer is adjacent to the second resin layer and the first resin layer is adhere to the second resin layer with or without the aid of an adhesive tie layer. 
   
   
       19 . The multilayer film of  claim 18  wherein the first resin layer is adhered to the second resin layer with the aid of an adhesive tie layer. 
   
   
       20 . The multilayer film of  claim 18  where in the first resin layer is adhere to the second resin layer without the aid of an adhesive tie layer. 
   
   
       21 . A multilayer film or preform consisting essentially of at least a first resin layer and a second resin layer wherein the first resin layer is formed from poly(l,3-propylene 2,6-naphthalate) and the second resin layer is formed from poly(ethylene terephthalate). 
   
   
       22 . The multilayer film of  claim 21  where in the first resin layer is adjacent to the second resin layer and the first resin layer is adhere to the second resin layer with or without the aid of an adhesive tie layer. 
   
   
       23 . The multilayer film of  claim 22  wherein the first resin layer is adhered to the second resin layer with the aid of an adhesive tie layer. 
   
   
       24 . The multilayer film of  claim 22  where in the first resin layer is adhere to the second resin layer without the aid of an adhesive tie layer.