| abstract |
Particularly for the renewable production of uniform, shiny, ie smooth, flexible and very shiny copper coatings, copper plating baths are used which comprise a mixture of oligomeric phenazinium compounds as additives. The mixture is at least one penagee selected from the group comprising a compound comprising two monomer units and a compound comprising three monomer units, having the general formulas <I> and <II> described in the claims and the specification. Nium compounds, and also additional oligomer phenazinium compounds. |