Copper electrolytic solution containing organic sulfur compound and quaternary amine compound of specified skeleton as additives and electrolytic copper foil produced therewith
View Patent ↗It is an object of the present invention to obtain a low-profile electrolytic copper foil with a small surface roughness on the side of the rough surface (the opposite side from the lustrous surface) in the manufacture of an electrolytic copper foil using a cathode drum, and more particularly to obtain an electrolytic copper foil which allows fine patterning, and which is superior in terms of elongation and tensile strength at ordinary temperatures and high temperatures. Furthermore, it is an object of the present invention to obtain a copper electrolytic solution for this purpose. This copper electrolytic solution contains as additives an organo-sulfur compound and a quaternary amine compound with a specific skeleton.
1. 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 − .
2. The copper electrolytic solution according to claim 1 , characterized in that the organo-sulfur compound is a compound expressed by the following general formula (10) or (11)
X—R 1 —(S) n4 —R 2 —Y (10)
R 4 —S—R 3 —SO 3 Z (11),
wherein R 1 , R 2 and R 3 each separately is an alkylene group with 1 to 8 carbon atoms, R 4 is a group selected from the group consisting of hydrogen,
X is a group selected from the group consisting of a sulfonic acid group, a phosphonic acid group, and a sulfonic acid- or phosphonic acid-alkali metal salt group or ammonium salt group, Y is a group selected from the group consisting of a sulfonic acid group, a phosphonic acid group, and a sulfonic acid- or phosphonic acid-sodium or potassium salt group, Z is hydrogen, sodium or potassium, and n 4 is 2 or 3.