Patent ID: 7074315

Claim:
An electrolytic copper plating bath for depositing a matt layer of copper comprising at least one copper salt, at least one acid, and at least one polyglycerin compound having at least one of the general formulae I, II or III: wherein n is an integer>1 and R 1 , R 2 , R 3 are identical or different and are selected from the group consisting of H, alkyl, acyl, phenyl and benzyl; or wherein n is an integer>0, m is an integer>0 and R 1 , R 2 , R 3 , R 4 are identical or different and are selected from the group consisting of H, alkyl, acyl, phenyl and benzyl; or wherein n is an integer>0, R 1 , R 2 , R 3 , R 4 are identical or different and are selected from the group consisting of H, alkyl, acyl, phenyl and benzyl.