PURPOSE: To obtain excellent adhesiveness of an insulative resin layer with a copper foil and an aluminum core by etching and roughing the aluminum surface with an acidic aqueous solution containing chlorine ions, by coating thinly the surface with a coupling agent and by heating and pressing a lamination of a specified insulative resin layer and the copper foil with each other.
CONSTITUTION: An aluminum 3 the surface of which has been etched and roughed with an acidic aqueous solution containing chlorine ions are thereafter is being coated thinly with a coupling agent, an insulative resin layer 2 consisting of polyethylene, cross-linked polyethylene or polymethylpentene and a copper foil whose roughed surface is being coated with a coupling agent are put one upon another and heated and pressed. The resin 2 has poor adhesiveness, but by using this method, very strong adhesion between the aluminum plate 3 and the copper foil 1 can be obtained because of a physical anchor effect and a chemical adhesive effect.
YOKOTA MITSUO
IIJIMA TOSHIYUKI
