Patent ID: 7166180

Claim:
A method of manufacturing a multi-layered printed wiring board of a build-up system in which conductive circuit layer and insulating layers are alternately piled up, wherein the insulating layers are made by a method of vacuum-laminating an adhesive film, wherein said adhesive film comprises a supporting base film and a resin composition having a thermal flowability and being in the solid state at normal temperature disposed on the surface of said supporting base film so that said resin composition is laminated on at least one surface of a pattern-processed circuit substrate under heating and pressing conditions, said method of vacuum-laminating an adhesive film comprising: (1) sheeting said adhesive film having the same size as or a smaller size than that of said circuit substrate in a state wherein the surface of said resin composition in said adhesive film is allowed to provisionally partially adhere to one surface or both surfaces of said circuit substrate; (2) disposing a protecting film having an area larger than that of said adhesive film on said adhesive film provisionally adhering to said circuit substrate so that the center of said protecting film is disposed at substantially the same position as that of the center of said adhesive film, followed by vacuum laminating under heating and pressing conditions; and post-treating said adhesive film to smooth said adhesive film comprising heating and pressing using a pressing metal plate or a laminating metal roll which can be used even while a protecting film having an area larger than that of said adhesive film is disposed between said supporting base film and said pressing metal plate or laminating metal roll, wherein said adhesive film comprises said supporting base film and said resin composition having a thermal flowability and being in the solid state at normal temperature disposed on the surface of said supporting base film and is vacuum laminated in the order of supporting base film/resin composition/circuit substrate.