Patent ID: 11970613
Assignee: SK MICROWORKS CO., LTD.
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C | IPC C

Claim 2:
3. The polymer film of claim 1, which has a ΔYI24 value represented by the following Equation 2a of 30% or less, and a ΔRo24 value represented by the following Equation 3a of 8% or less:, Δ
      ⁢
      
       
        YI
        
         2
         ⁢
         4
        
       
       (
       %
       )
      
     
     =
     
      
       
        
         ❘
         "\[LeftBracketingBar]"
        
        
         
          YI
          
           2
           ⁢
           4
          
         
         -
         
          Y
          ⁢
          
           I
           0
          
         
        
        
         ❘
         "\[RightBracketingBar]"
        
       
       
        Y
        ⁢
        
         I
         0
        
       
      
      ×
      100
     
    
   
   
    
     Equation
     ⁢
        
     2
     ⁢
     a
    
   
  
 

 
  
   
    
      
     
      
       Δ
       ⁢
       
        
         Ro
         
          2
          ⁢
          4
         
        
        (
        %
        )
       
      
      =
      
       
        
         
          ❘
          "\[LeftBracketingBar]"
         
         
          
           Ro
           
            2
            ⁢
            4
           
          
          -
          
           R
           ⁢
           
            o
            0
           
          
         
         
          ❘
          "\[RightBracketingBar]"
         
        
        
         R
         ⁢
         
          o
          0
         
        
       
       ×
       1
       ⁢
       0
       ⁢
       0
      
     
    
   
   
    
     Equation
     ⁢
        
     3
     ⁢
     a
    
   
  
 

wherein in Equation 2a,
YI0 refers to the yellow index before the film is treated in an autoclave, and
YI24 refers to the yellow index after the film is treated in an autoclave,
wherein in Equation 3a,
Ro0 refers to the in-plane retardation before the film is treated in an autoclave,
Ro24 refers to the in-plane retardation after the film is treated in an autoclave,
and the autoclave treatment means that an autoclave is filled with water and a film is treated therein at a temperature of 120° C. and a pressure of 1.2 atm for 24 hours.