Container of biodegradable heat-resistant hard resin molding

Abstract

A shaped container of biodegradable, heat-resistant and rigid resin having a laminate structure including a glycolic acid polymer layer and another biodegradable resin layer, is formed by shaping under heating so that another biodegradable resin forms an outer and/or inner layer. The container is excellent in biodegradability, stiffness and heat resistance as well as excellent see-through of contents, and is suitable as a temporary preservation container for food, etc.

1 . A shaped container of biodegradable, heat-resistant and rigid resin, having a laminate structure including a glycolic acid polymer layer and another biodegradable resin layer, which has been shaped under heating so that said another biodegradable resin layer forms an outer and/or inner layer.  
   
   
       2 . A shaped container according to  claim 1 , wherein said another biodegradable resin layer is disposed at least as the outer layer outside the glycolic acid polymer layer.  
   
   
       3 . A shaped container according to  claim 2 , wherein said outer layer of another biodegradable resin comprises a lactic acid polymer.  
   
   
       4 . A shaped container according to  claim 2 , further including said another biodegradable resin layer also as an inner layer disposed inside the glycolic acid polymer layer.  
   
   
       5 . A shaped container according to  claim 4 , wherein said inner layer of another biodegradable resin comprises a lactic acid polymer.  
   
   
       6 . A shaped container according to  5   claim 1 , further including an adhesive layer between the glycolic acid polymer layer and the outer and/or inner biodegradable resin layer.  
   
   
       7 . A shaped container according to  claim 1 , wherein the glycolic acid polymer layer and another biodegradable resin layer have a total thickness of 100-5000 μm, of which the thickness of the glycolic acid polymer layer occupies 2-98%.  
   
   
       8 . A shaped container according to  claim 1 , which has been treated for heat-setting after the shaping under heating.  
   
   
       9 . A shaped container according to  claim 1 , exhibiting a flexural modulus Ef of at least 100 kg/mm 2  as measured in a state where a load is applied from the outer resin layer.  
   
   
       10 . A shaped container according to  claim 9 , exhibiting a flexural modulus Ef (as measured in a state where a load is applied to the outer resin layer) and a container thickness t giving a product Ef×t of at least 1 kg/mm.  
   
   
       11 . A package, comprising a shaped container of biodegradable, heat-resistant and rigid resin according to  claim 1  and a biodegradable film.  
   
   
       12 . A package according to  claim 11 , wherein the biodegradable film is heat-shrinkable.  
   
   
       13 . A package according to  claim 11  wherein the biodegradable film includes at least one glycolic acid polymer layer.  
   
   
       14 . A package according to  claim 12 , wherein the biodegradable film has a gas-barrier property.