Abstract: According to an embodiment of the present invention, a conductive membrane transfer sheet including a first release sheet and a conductive membrane is provided. The first release sheet includes a liquid-permeable sheet. The conductive membrane includes a conductive fiber supported on a first major surface of the first release sheet. The first release sheet and the conductive membrane contain a first liquid.

Abstract: Disclosed is a resin composition comprising a thermosetting resin, a thermoplastic resin and a filler. The cured resin of the resin composition has a fine phase separated structure, and the filler is distributed in one of the thermosetting resin rich phase and the thermoplastic resin rich phase. The resin composition of the present invention permits obtaining an insulating layer, which has a high resistance to heat, has a high toughness, is small in thermal deformation, exhibits a high bonding strength with a copper wiring, and permits forming a fine pattern.