Patent ID: 6551433
Filing Date: 2003-04-22
Classification: B32B,H05K,Y10S,Y10T

Abstract:
A method for producing a copper-clad laminate, which method includes hot-pressing, in a build-up process, an outer copper foil layer onto an inner layer substrate having a through hole or a cavity serving as interlayer electrical connection means such as an interstitial via hole (IVH) or a blind via hole (BVH), the method comprising the steps of:hot-pressing resin-coated copper foil onto a surface of the inner layer substrate; and optionally reducing the thickness of a copper foil layer which is to serve as an outer layer, the resin-coated copper foil being formed of copper foil having a thickness of 15 &mgr;m or more and a rupture strength of 275 kN/m2 or more to prevent dent faults in said copper foil as measured through a bulge test performed after the foil is heated, wherein the resin-coated copper foil has a resin layer on one side of the copper foil, and hot-pressing being performed while the resin layer of the resin-coated copper foil is in contact with a surface of the inner layer substrate.