Patent ID: 7163600

Claim:
A method of manufacturing a copper foil provided with a semi-cured insulating layer containing a backbone material on one side surface of the copper foil, said method comprising the steps of: 1) providing on one side surface of the copper foil a liquid thermosetting resin layer containing a solvent; 2) semi-curing said liquid thermosetting resin layer by drying to remove said solvent preliminarily; 3) placing a nonwoven fabric or woven cloth serving as a backbone material onto said semi-cured thermosetting resin layer; 4) heating said semi-cured thermosetting resin to flow and to allow said nonwoven fabric or woven cloth as the backbone material to be impregnated with the resin, and further allow the resin to exude to an opposite side of said nonwoven fabric or woven cloth to form a semi-cured insulating layer containing said nonwoven fabric or woven cloth on one side of the copper foil; and 5) adjusting said thermosetting resin layer to be X−30 (μm) to X−3 (μm) in thickness in relation to a thickness (X (μm)) of the formed insulating layer.