Patent ID: 7144491

Claim:
In a copper electrolytic solution which is used in the manufacture of an electrolytic copper foil, the improvement comprising the copper electrolytic solution containing, as additives, an organo-sulfur compound and a quaternary amine compound with a specific skeleton expressed by the following general formulae (2)–(4), (6), (7) and (9), which is obtained by an addition reaction between a compound which has one or more epoxy groups per molecule and an amine compound, followed by a quaternization of the nitrogen, wherein n is an integer of 1 to 3 and, wherein R 1 and R 2 each indicate a group selected from the group consisting of a hydroxyalkyl group, an ether group, an aromatic group, an aromatic-substituted alkyl group, an unsaturated hydrocarbon group and an alkyl group, R 3 indicates a benzyl group, an allyl group or an alkyl group with 1 to 5 carbon atoms, and X 1 − indicates Cl − , Br − or CH 3 SO 4 − .