Patent ID: 9585261
Date: 2017-02-28
CPC Classifications: H05K,Y10T

Claim:
1. A manufacturing method of a multilayer printed wiring board employing a coreless build-up method using a copper foil with carrier foil, the manufacturing method comprising: preparing the copper foil with carrier foil consisting of at least four layers, in the following order: a carrier foil/a release layer/a heat-resistant metal layer/a copper foil layer, and wherein the thickness of the carrier foil is greater than the thickness of the copper foil layer; manufacturing a supporting substrate consisting of the copper foil with carrier foil and an insulating layer constituting material by laminating the insulating layer constituting material to the copper foil layer surface of the copper foil with carrier foil; manufacturing a build-up wiring layer by forming the build-up wiring layer on the carrier foil surface in the supporting substrate; manufacturing a multilayered laminate by separating the supporting substrate with the build-up wiring layer at the release layer in the supporting substrate, wherein the supporting substrate comprises the release layer, the heat-resistant metal layer, the copper foil, and the insulating layer, in this order; and manufacturing the multilayer printed wiring board by processing the multilayered laminate.