Patent ID: 7614145

Claim:
A method for manufacturing a multilayer circuit board comprising: 1) step 1 of forming a curable resin composition layer containing an insulating resin and a curing agent on one or both sides of an inner layer board having an electrical insulating layer with a conductor circuit formed on one or both sides thereof, so as to cover said conductor circuit; 2) step 2 of bringing a compound having a structure capable of coordinating to metal atoms or metal ions into contact with the surface of said curable resin composition layer and removing an excess of said compound from the surface of said curable resin composition layer after said contact of said compound with the surface of said curable resin composition layer, wherein said compound is i) an organic compound having an amino group, a thiol group, a carboxyl group, or a cyano group, ii) a heterocyclic compound having a nitrogen atom, an oxygen atom, or a sulfur atom, or iii) an imidazole, a pyrazole, a triazole, or a triazine having an amino group, a thiol group, a carboxyl group, or a cyano group, wherein said compound is penetrated into the surface of said curable resin composition layer, and wherein the excess of said compound is removed from the surface of said curable resin composition layer whereby no layer of said compound is formed on the surface of said curable resin composition layer; 3) step 3 of forming an electrical insulating layer by curing said curable resin composition layer, wherein said compound having a structure capable of coordinating to metal atoms or metal ions has penetrated into the surface of the electrical insulating layer and is held within said electrical insulating layer; 4) step 4 of forming at least one metallic thin film layer on the surface of said electrical insulating layer of step 3; and 5) step 5 of forming a conductor circuit on the surface of said electrical insulating layer of step 3 utilizing said metallic thin film layer.