Patent ID: 7661190

Claim:
A process for producing a multilayer printed wiring board, comprising the steps of: causing the surface of a resin layer, which is uncured or partly-cured and made of a curable composition comprising an insulation polymer and a curing agent, to come in contact with i) a liquid heterocyclic compound containing a nitrogen atom, an oxygen atom, or a sulfur atom, in the ring thereof and having an amino group, thiol group, carboxyl group or cyano group or ii) a solution of a heterocyclic compound containing a nitrogen atom, an oxygen atom, or a sulfur atom, in the ring thereof and having an amino group, thiol group, carboxyl group or cyano group as a main component; the resin layer being formed on an internal layer substrate comprising a formed body of an electrical insulation material and a first conductive layer as the outermost layer, which is formed on the formed body; subsequently, curing the resin layer to form an electrical insulation layer wherein the surface of the obtained electrical insulation layer is the same as the surface of the resin layer; oxidizing the surface of the obtained electrical insulation layer until the surface average roughness of the electrical insulation layer becomes within the range not less than 0.05 μm and less than 0.2 μm and the surface ten-point average roughness thereof within the range not less than 0.3 μm and less than 4 μm; and thereafter forming a second conductive layer on the electrical insulation layer using a plating method.