PRODUCTION METHOD OF ELECTRO-DEPOSITED COPPER FOIL, ELECTRO-DEPOSITED COPPER FOIL OBTAINED BY THE PRODUCTION METHOD, SURFACE-TREATED COPPER FOIL OBTAINED BY USING THE ELECTRO-DEPOSITED COPPER FOIL AND COPPER-CLAD LAMINATE OBTAINED BY USING THE ELECTRO-DEPOSITED COPPER FOIL OR THE SURFACE-TREATED COPPER FOIL

摘要

An object of the present invention is to provide a production method which enables efficient production of an electro-deposited copper foil with further lower profile when compared to the low-profile electro-deposited copper foils which have been supplied to the market and is excellent in mechanical strength. For the purpose of achieving the object, a production method adopted obtains the electro-deposited copper foil by electrolyzing a sulfuric acid based copper electrolytic solution which contains a quaternary ammonium salt polymer having cyclic structure and chlorine, wherein for the quaternary ammonium salt polymer contained in the sulfuric acid based copper electrolytic solution, a DDAC dimer or higher polymer is used. For the quaternary ammonium salt polymer, a diallyl dimethyl ammonium chloride polymer having a number average molecular weight of 300 to 10000 is preferably used. The sulfuric acid based copper electrolytic solution preferably contains bis(3-sulfopropyl) disulfide or 3-mercapto-1-propanesulfonic acid that is a compound having a mercapto group.