Patent ID: 11945925
Assignee: SK IE TECHNOLOGY CO., LTD.
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C  G | IPC C  G

Claim 0:
1. A polyimide-based film having a surface hardness change rate of 6 to 35%, wherein the surface hardness change rate is determined by measuring an initial surface hardness, H0 (GPa), of the polyimide-based film, immersing the polyimide-based film in 2-methoxyethanol at 25° C. for 5 minutes, and measuring a surface hardness, H1 (GPa), of the polyimide-based film after being immersed, and calculating the surface hardness change rate according to the following formula:, Surface
  ⁢
     
  hardness
  ⁢
     
  change
  ⁢
     
  rate
  ⁢
  
    
     
  
  ⁢
  
   
    (
    %
    )
   
   =
   
    
     
      
       H
       0
      
      -
      
       H
       1
      
     
     
      H
      0
     
    
    ×
    1
    ⁢
    0
    ⁢
    
     0
     .