Electrolytic copper foil, cleaning fluid composition and method for cleaning copper foil

Abstract

An electrolytic copper foil includes a copper foil body; and a IIA-group metal adhered to a surface of the copper foil body, wherein a signal strength of the IIA group metal is greater than 0.1% based on a signal strength of copper element as 100% analyzed by a secondary ion mass spectrometer. The present invention also provides a method for cleaning copper foil and a cleaning fluid composition which is used in the cleaning method.

1 - 3 . (canceled) 
     
     
         4 . A cleaning fluid composition for cleaning electrolytic copper foil, comprising:
 a liquid medium; and   a salt of a group-IIA metal, wherein a content of a metal ion dissociated from the salt in the liquid medium is 10 mg/L or more.   
     
     
         5 . The cleaning fluid composition of  claim 4 , wherein the content of the metal ion dissociated from the salt in the liquid medium is 32 mg/L or more. 
     
     
         6 . The cleaning fluid composition of  claim 5 , wherein the content of the metal ion dissociated from the salt in the liquid medium is 63 mg/L or more. 
     
     
         7 . The cleaning fluid composition of  claim 4 , wherein the liquid medium is deionized water or pure water. 
     
     
         8 . The cleaning fluid composition of  claim 4 , wherein the metal ion is magnesium ion or calcium ion. 
     
     
         9 . The cleaning fluid composition of  claim 4 , wherein the salt of the group-IIA metal is at least one of magnesium chloride and calcium chloride. 
     
     
         10 . A method for cleaning an electrolytic copper foil, comprising a step of applying the cleaning fluid composition of  claim 4  to the electrolytic copper foil. 
     
     
         11 . The method of  claim 10 , further comprising performing an anti-rust treatment on the electrolytic copper foil. 
     
     
         12 . The method of  claim 10 , further comprising rinsing the electrolytic copper foil with a fluid. 
     
     
         13 . The method of  claim 12 , wherein the rinsing is performed by spraying the fluid in fan-shaped spray-column to the electrolytic copper foil. 
     
     
         14 . The method of  claim 10 , wherein the step of applying the cleaning fluid composition includes immersing the electrolytic copper foil in the cleaning fluid composition of  claim 4 . 
     
     
         15 . The method of  claim 14 , wherein the electrolytic copper foil is immersed in the cleaning fluid composition for 0.1 to 20 seconds.