Schering Aktiengesellschaft

Atotech Deutschland Gmbh

Klaus Gedrat

Heinrich Meyer

Walter J Meyer

Burkhard Bressel

Hartmut Mahlkow

Hans-Jurgen Ehrich

Joachim Wolff

The process for directly metallizing a circuit board having nonconductor surfaces, includes reacting the nonconductor surface with an alkaline permanganate solution to form manganese dioxide chemically adsorbed on the nonconductor surface; forming an aqueous solution of a weak acid and of pyrrole or a pyrrole derivative and soluble oligomers thereof; contacting the aqueous solution containing the pyrrole monomer and its oligomers with the nonconductor surface having the manganese dioxide adsorbed chemically thereon to deposit an adherent, electrically conducting, insoluble polymer product on the nonconductor surface; and directly electrodepositing metal on the nonconductor surface having the insoluble adherent polymer product formed thereon. The oligomers are advantageously formed in aqueous solution containing 0.1 to 200 g/l of the pyrrole monomer at a temperature between room temperature and the freezing point of the solution.

Process for metallization of a nonconductor surface

The process for directly metallizing a circuit board having nonconductor surfaces, includes reacting the nonconductor surface with an alkaline permanganate solution to form manganese dioxide chemically adsorbed on the nonconductor surface; forming an aqueous solution of a weak acid having an acid dissociation constant, for loss of a proton in aqueous solution, between 0.1 and 0.01, and of pyrrole or a pyrrole derivative and soluble oligomers thereof; contacting the aqueous solution containing the pyrrole monomer and its oligomers with the nonconductor surface having the manganese dioxide adsorbed chemically thereon to deposit an adherent, electrically conducting, insoluble polymer product on the nonconductor surface; and directly electrodepositing metal on the nonconductor surface having the insoluble adherent polymer product formed thereon. The oligomers are advantageously formed in aqueous solution containing 0.1 to 200 g/l of the pyrrole monomer at a temperature between room temperature and the freezing point of the solution.

Process for metallization of a nonconductor surface, especially on a

A method for producing printed circuits. An epoxy resin reinforced with glass fiber is used as basis material, coated with copper, drilled and activated. In one embodiment, the circuit diagram is applied after covering the non-desired regions with a resistance, by screen or photo printing. A nickel, cobalt, or nickel-cobalt layer is deposited onto the circuit, the circuit is covered with a solder prevention lacquer, then the eyes and bore holes are covered with copper. Alternatively, after pre-treatment and activation, all areas except the soldering eyes and bore holes are covered with resist, a nickel, cobalt or nickel-cobalt layer is applied, the circuit diagram is printed using a resist, and the eyes and bore hole are treated as above.

Method for producing printed circuits

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Berlin, Germany

Klaus Gedrat