Patent ID: 8114263

Claim:
An aqueous acidic solution for electrolytically depositing copper coatings said acidic solution containing copper ions, characterized in that said solution contains at least one polyvinylammonium compound selected from the group comprising compounds having general chemical formula (I): wherein l, m and n are indices of monomer units indicating the fraction, to be expressed in [mole %], of the respective monomer units in the polyvinylammonium compound, wherein l+m+n in the compound is 100 mole % with the proviso that 1) l+m is in a range of from 1 to 100 mole %, relating to l+m+n, and n is in a range of from 99 to 0 mole %, relating to l+m+n, and 2) m is in a range of from 1 to 100 mole %, relating to l+m, and l is in a range of from 99 to 0 mole %, relating to l+m, R 1 is a radical, selected from the group comprising substituted and unsubstituted aralkyl and alkenyl, R 2 is CHO or H, with R 2 being the same or different in all the monomer units having index l in the polyvinylammonium compound, with the proviso that the fraction of the H-containing monomer units having index l is within a range of from 1 to 100 mole %, relating to all the monomer units having index l, and that the fraction of the CHO-containing monomer units having index l is within a range of from 99 to 0 mole %, relating to all the monomer units having index l, R 3 is a radical selected from the group comprising saturated carboxylic acids having 1 to 6 carbon atoms, unsaturated carboxylic acids having 3 to 8 carbon atoms as well as esters, anhydrides, amides and nitriles of the said carboxylic acids, with R 3 being the same or different in all the monomer units having index n in the polyvinylammonium compound, and A − is an acid anion, as well as compounds having general chemical formula (I), wherein one of the monomer units having index l or m or both are present in the neutral form.