Bayer Aktiengesellschaft

Friedrich Langer

Rudolf Merten

Kirkor Sirinyan

Gerhard D Wolf

Ulrich Von Gizycki

Conductor boards with well adhering conductor tracks are obtained if the substrates, which are clad on both sides with copper foils, have said cladding removed chemically or mechanically, are activated, if necessary sensitized, and are provided with a 0.05-2.0 .mu.m thick layer of nickel, cobalt, manganese, a nickel/iron or nickel/cobalt mixture in an electroless metallizing bath, a 0.5-5.0 .mu.m thick copper layer is applied in a subsequent copper bath and the conductor pattern is then built up by the standard semi-additive methods.

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Bergisch-Gladbach, Germany

Friedrich Langer