Patent ID: 11969978
Assignee: ARKEMA FRANCE
Field: Surface technology, coating (Chemistry)
Classification: CPC B  C | IPC B

Claim 7:
8. The film according to claim 1,
wherein a recovery force index Rv is represented by Equation 2 below, and the Rv of the elastic layer is greater than 50;, Rv
     =
     
      
       (
       
        
         
          X
          
           2
           ⁢
           %
          
         
         -
         Xf
        
        
         
          X
          
           2
           ⁢
           %
          
         
         -
         Xo
        
       
       )
      
      ×
      100
     
    
   
   
    
     [
     
      Equation
      ⁢
         
      2
     
     ]
    
   
  
 

where Xo is a length (mm) of the initial elastic layer, X2% is a length (mm) of the elastic layer after 2% length stretching, and when 1 cycle is defined as a process consisting of 2% length stretching at a rate of 50 mm/min and restoring to original length at a rate of 50 mm/min, Xf is a length (mm) of the elastic layer after 100 cycles.