Abstract: A flexible metal foil laminate sheet wherein a polyimide layer comprises a polyimide laminate having a three-layer structure in which thermoplastic polyimide layers are formed on both the surfaces of a polyimide film; metal foil layers are heated and pressed against both the sides of the polyimide laminate; and the thickness of the thermoplastic polyimide layer is 100% or more of an average roughness at 10 points on the surface of the metal foil which contacts the thermoplastic polyimide layer; and a method for manufacturing the flexible metal foil laminate sheet. According to the present invention, there can be manufactured the flexible metal foil laminate sheet in which a necessary and sufficient adhesive force is present in an interface between a metal foil and an insulating layer and which is excellent in heat resistance, chemical resistance, electrical properties and the like.

Abstract: An insulating adhesive tape which comprises a base supporting film and an adhesive layer formed on at least one surface thereof, said adhesive layer being formed of a thermoplastic polymer comprising a thermoplastic polyimide, wherein said thermoplastic polymer has a glass transition temperature ranging from 180.degree. C. to 280.degree. C. and an elastic modulus ranging from 10.sup.10 dyne/cm.sup.2 to 10.sup.11 dyne/cm.sup.2 at 25.degree. C., said modulus including a value ranging from 10.sup.2 dyne/cm.sup.2 to 10.sup.9 dyne/cm.sup.2 at a temperature between 250.degree. C. and 300.degree. C.