Patent ID: 7678257

Claim:
A method of manufacturing an electrolytic copper foil comprising the step of electrodepositing a copper foil on a rotating cathode drum from a copper electrolytic solution containing, as additives, an organo-sulfur compound expressed by the following general formula (4) or (5) X—R 1 —(S) n —R 2 —Y (4) R 4 —S—R 3 —SO 3 Z (5), wherein R 1 , R 2 and R 3 each independently are an alkylene group with 1-8 carbon atoms, R 4 is a group selected from the group consisting of hydrogen, X is selected from the group consisting of hydrogen, a sulfonic acid group, a phosphoric acid group and an alkali metal salt group or ammonium salt group of sulfonic acid or phosphonic acid, Y is selected from the group consisting of a sulfonic acid group, a phosphonic acid group and an alkali metal salt group of sulfonic acid or phosphonic acid, Z is hydrogen or an alkali metal and n is 2 or 3, and a quaternary amine compound polymer obtained by homopolymerizing a compound expressed by the following general formula (2) or (3) wherein R 1 ′ is hydrogen or an alkyl group with 1-5 carbon atoms, R 2 ′ is an alkyl group with 1-5 carbon atoms, R 3 ′ is an alkyl group with 1-5 carbon atoms, a benzyl group or an allyl group, X 1 is Cl, Br or CH 3 SO 4 and n 1 is an integer of 1-5, or copolymerizing the compound of formula (2) or (3) with another compound having an unsaturated bond.