Patent ID: 7927453

Claim:
A method of manufacturing a copper foil provided with a semi-cured insulating layer containing a skeletal component on one side surface of the copper foil which method is a method of manufacturing a copper foil with an insulating layer, wherein a first semi-cured thermosetting resin layer is provided on one side surface of the copper foil; a nonwoven fabric not impregnated with resin or a woven cloth not impregnated with resin to be the skeletal component is press-bonded onto said first semi-cured thermosetting resin layer; a second thermosetting resin is applied onto a surface of the press-bonded nonwoven fabric or woven cloth to form a second thermosetting resin layer; wherein said second thermosetting resin is applied onto the surface of the press-bonded nonwoven fabric or woven cloth as a liquid resin which liquid resin comprises a combination of a resin and a solvent; and a semi-cured insulating layer which contains a nonwoven fabric or a woven cloth on one side surface of the copper foil is formed by subsequently drying the second thermosetting resin layer into a semi-cured state.