Transparent multilayer polypropylene container with barrier protection

Abstract

A multilayer plastic container comprises a layer of a polypropylene and a layer of EVOH directly adjacent the layer of polypropylene wherein at least one of the polypropylene and EVOH layers comprises an adhesive such as maleic anhydride concentrate mixed therein to adhere the layer of polypropylene to the layer of EVOH.

We claim:  
     
         1 . A multilayer injection molded container comprising: 
 a first layer comprising polypropylene; and    a second layer comprising a material selected from the group consisting of EVOH and nylon, directly adjacent to said first layer;    wherein at least one of said first and second layer further comprises an adhesive mixed therein.    
     
     
         2 . The container of    claim 1    wherein said first layer contains approximately 0.01% to 0.20% maleic anhydride.  
     
     
         3 . The container of    claim 1    wherein said first layer contains approximately 0.015% maleic anhydride.  
     
     
         4 . The container of    claim 1    wherein said container has a haze value of less than approximately 29% measured through a section of the bottle having a total thickness of greater than approximately 15 mils.  
     
     
         5 . The container of    claim 1    wherein said container has a haze value of approximately 10%-12% measured through a section of the bottle having a total thickness of greater than approximately 15 mils.  
     
     
         6 . The container of    claim 1    wherein said second layer comprises EVOH.  
     
     
         7 . The container of    claim 1    wherein said second layer comprises MXD6 nylon.  
     
     
         8 . The container of    claim 1    wherein said second layer comprises nylon 6.  
     
     
         9 . The container of    claim 1    wherein said second layer comprises nylon 6/66.