Patent ID: 11932725
Assignee: ECOVANCE CO. LTD.
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C  Y | IPC C

Claim 4:
5. The biodegradable polyester resin of claim 1, wherein a biodegradable polyester film comprising the biodegradable polyester resin has a biodegradability of 90% or more as measured by the amount of carbon dioxide generated according to KS M3100-1 and a water degradability reduction rate represented by the following Equation 4 of 85% or more:, Water
      ⁢
         
      degradability
      ⁢
         
      reduction
      ⁢
         
      rate
      ⁢
         
      
       (
       %
       )
      
     
     =
     
      
       
        
         M
         ⁢
         
          n
          A
         
        
        -
        
         M
         ⁢
         
          n
          B
         
        
       
       
        M
        ⁢
        
         n
         A
        
       
      
      ×
      1
      ⁢
      0
      ⁢
      0
     
    
   
   
    
     [
     
      Equation
      ⁢
         
      4
     
     ]
    
   
  
 

in Equation 4, MnA and MnB are each a number average molecular weight of a biodegradable polyester sheet prepared from the biodegradable polyester resin as measured using gel permeation chromatography (GPC) in which the biodegradable polyester sheet is immersed in water and subjected to water degradation acceleration at 80° C. in a hot air oven,
MnA is the initial number average molecular weight of the biodegradable polyester sheet, and
MnB is the number average molecular weight of the biodegradable polyester sheet after 3 months of the water degradation acceleration.