Battery package and method for producing the same

Abstract

The present invention provides a battery package excellent in strength, impact resistance and transparency, wherein main components thereof are all made of a biodegradable resin by vacuum forming. The battery package includes a base and a container composed of a drawn sheet of biodegradable aliphatic polyester. The drawn sheet is made of a composition containing a polylactic polymer and at least one of polybutylene succinate and polycaprolactone.

1 . A battery package comprising a base and a container including a drawn sheet of biodegradable aliphatic polyester, wherein said drawn sheet comprises a composition containing a polylactic polymer and either of polybutylene succinate and polycaprolactone.  
     
     
         2 . The battery package in accordance with  claim 1 , wherein said base comprises a biodegradable aliphatic polyester.  
     
     
         3 . The battery package in accordance with  claim 1 , further comprising a laminate layer comprising a biodegradable aliphatic polyester arranged between said base and said container.  
     
     
         4 . The battery package in accordance with  claim 2 , wherein said biodegradable aliphatic polyester constituting said base is a polylactic polymer.  
     
     
         5 . The battery package in accordance with  claim 1 , wherein said base has a first printing layer, an anti-offset layer and a second printing layer laminated in this order on the surface thereof opposite to the container-side surface.  
     
     
         6 . A method for producing a battery package comprising the steps of: 
 forming a drawn sheet of biodegradable aliphatic polyester into a container having a holder portion by vacuum forming; and    integrating said container with a base comprising a drawn sheet of biodegradable aliphatic polyester to obtain a battery package.    
     
     
         7 . The method for producing a battery package in accordance with  claim 6 , wherein said drawn sheet comprises a composition containing a polylactic polymer and either of polybutylene succinate and polycaprolactone.  
     
     
         8 . The method for producing a battery package in accordance with  claim 6 , further comprising the steps of: 
 bonding a laminate layer comprising a drawn sheet of biodegradable aliphatic polyester to said base to obtain a bonded product; and    heat sealing said laminate layer and said container to integrate said base and said container.    
     
     
         9 . The method for producing a battery package in accordance with  claim 6 , further comprising the steps of: 
 bending the peripheral edges of said container on the opposite side of said holder portion to form folds; and    inserting said base in said folds to integrate said container and said base.    
     
     
         10 . The method for producing a battery package in accordance with  claim 6 , wherein said base comprises a biodegradable aliphatic polyester.  
     
     
         11 . The method for producing a battery package in accordance with  claim 10 , wherein said biodegradable aliphatic polyester constituting said base is a polylactic polymer.