Abstract: A process for manufacturing a multilayer wiring board including the steps of forming an insulating layer on a base provided with a bump for interlayer connection, bonding a copper foil onto the insulating layer by a thermocompression bonding by sandwiching the copper foil between stainless steel plates, and patterning the copper foil, in which a metal foil is interposed at least between each of the stainless plates and the copper foil at the time of the thermocompression bonding. At this time, a mold release layer is formed on a surface of the metal foil to be imposed. Thus, such a multilayer wiring board can be manufactured that prevents sticking of a product after molding (cementing of the copper foil) and excels in dimensional stability without occurrence of wrinkling and ruggedness.

Abstract: Disclosed is a multilayer wiring board in which a copper foil is bonded by a thermocompression bonding onto an insulating layer having a bump for interlayer connection buried therein, and the copper foil and the bump are electrically connected to each other. The copper foil is provided with an oxide film having a thickness of 50 ? to 350 ? on a surface in contact with the bump and an insulating layer. In a manufacturing process, for example, an oxide coating of the copper foil to be subject to the thermocompression bonding is removed by acid cleaning, and then an oxide film having an appropriate thickness is formed by irradiating the copper foil with ultraviolet light. Consequently, reliability in electrical connection between the copper foil and the burn is adequately ensured, while achieving sufficient mechanical connection strength between the copper foil and the insulating layer.

Abstract: Disclosed is a multilayer wiring board in which a copper foil is bonded by a thermocompression bonding onto an insulating layer having a bump for interlayer connection buried therein, and the copper foil and the bump are electrically connected to each other. The copper foil is provided with an oxide film having a thickness of 50 ? to 350 ? on a surface in contact with the bump and an insulating layer. In a manufacturing process, for example, an oxide coating of the copper foil to be subject to the thermocompression bonding is removed by acid cleaning, and then an oxide film having an appropriate thickness is formed by irradiating the copper foil with ultraviolet light. Consequently, reliability in electrical connection between the copper foil and the burn is adequately ensured, while achieving sufficient mechanical connection strength between the copper foil and the insulating layer.

Abstract: A process for manufacturing a multilayer wiring board including the steps of forming an insulating layer on a base provided with a bump for interlayer connection, bonding a copper foil onto the insulating layer by a thermocompression bonding by sandwiching the copper foil between stainless steel plates, and patterning the copper foil, in which a metal foil is interposed at least between each of the stainless plates and the copper foil at the time of the thermocompression bonding. At this time, a mold release layer is formed on a surface of the metal foil to be imposed. Thus, such a multilayer wiring board can be manufactured that prevents sticking of a product after molding (cementing of the copper foil) and excels in dimensional stability without occurrence of wrinkling and ruggedness.