| abstract |
A process for the production of an electrolytic copper foil from a sulfurically acidic copper sulfate electrolytic solution which contains additives of 0.1 to 1.0 g/# of an oxyethylenic surfactant, 50 to 250 mg/# of a chloride, 1 to 10 mg/# of a glue or gelatin and 1 to 10 mg/# of a nitrogen-containing organic compound. The nitrogen-containing organic compound may be α-naphthoquninoline; 1,10-phenanthroline; 4,7-diphenyl-1,10- phenanthroline; 2,9-dimethyl-1,10-phenanthroline; 4,7-diphenyl-2,9-dimethyl-1,10-phenanthroline; pyridine; nicotic acid; or triazine. The dyestuff thioflavine T or Janus Green may also be used. The foil formed has a Vickers hardness of 180-320 at 25‹C and a Vickers hardness of not less than 150 after 30 minutes of heat treatment at 220‹C. |