Abstract: When extrusion of a molten resin by means of an extruder is started, a simple polyetherimide resin is melt extruded from a lip portion 7a of a T-die 7, and a film of the simple polyetherimide resin is molded. The molding material is then switched to a resin composition including the polyetherimide resin and a fluorine resin and then a film of the resin composition is continuously extruded and molded from the T-die 7. Having been covered with a very thin film 8a of the simple polyetherimide resin, on a flow passage face of the lip portion 7a of the T-die 7, a resin composition layer 8b including a polyetherimide resin and a fluorine resin, which has affinity with the film 8a, is then formed at a center part.

Abstract: The present invention provides a method for manufacturing a film for a film capacitor making it possible to produce a film for a film capacitor which has a thickness of 10 ?m or less and which is excellent in a heat resistance and a voltage resistance at a high thickness accuracy by using a polyetherimide resin and provides as well a film for a film capacitor.

Abstract: An asymmetric membrane contains a porous layer and a dense layer adjacent thereto. The porous layer and the dense layer are formed of a polymeric material. The porous layer and/or dense layer contains a filler. The amount of the filler is 11 parts by mass or more per 100 parts by mass of the polymeric material contained in the asymmetric membrane.

Abstract: The present invention provides a method for manufacturing a film for a film capacitor in which a film can be prepared by melt extrusion molding in a thin film having a thickness of 10 ?m or less and in which a cost can be cut by simplifying a manufacturing step thereof and a film for a film capacitor. It is a method for manufacturing a film for a film capacitor comprising the steps of charging a melt extrusion molding equipment 10 with a molding material 1 to mold a film 20 for a film capacitor by extruding from a dice 12, interposing the above extruded and molded film 20 for a film capacitor between a pressing roll 31 and a metal roll 32 to cool it and winding up the cooled film 20 for a film capacitor having a thickness of 10 ?m or less in order on a winding tube 41 of a winding device 40, wherein the molding material 1 is prepared by adding a fluorocarbon resin to a PEI resin having a glass transition point of 200° C.

Abstract: When extrusion of a molten resin by means of an extruder is started, a simple polyetherimide resin is melt extruded from a lip portion 7a of a T-die 7, and a film of the simple polyetherimide resin is molded. The molding material is then switched to a resin composition including the polyetherimide resin and a fluorine resin and then a film of the resin composition is continuously extruded and molded from the T-die 7. Having been covered with a very thin film 8a of the simple polyetherimide resin, on a flow passage face of the lip portion 7a of the T-die 7, a resin composition layer 8b including a polyetherimide resin and a fluorine resin, which has affinity with the film 8a, is then formed at a center part.

Abstract: The present invention provides a method for manufacturing a film for a film capacitor making it possible to produce a film for a film capacitor which has a thickness of 10 ?m or less and which is excellent in a heat resistance and a voltage resistance at a high thickness accuracy by using a polyetherimide resin and provides as well a film for a film capacitor.

Abstract: Disclosed is an asymmetric membrane having a porous layer and a dense layer adjacent to the porous layer. The porous layer and the dense layer are made of a polymer material. The porous layer and/or the dense layer contains a filler.