| 摘要 |
PURPOSE:To realize a metallized polypropylene film which can provide a capacitor excelling in breakdown voltage and dielectric loss tangent by applying a metallic layer to the surface of a specified polypropylene film and making the thickness of the metallic layer thicker on the edge of the lead takeout side than on the normal part in a heavy edge construction. CONSTITUTION:A polypropylene film 1, the surface atomic ratio of which is that the number of nitrogen atoms/the number of carbon atoms is in the range of over 0.11 and under 0.22 and the number of oxygen atoms/the number of carbon atoms is in the range of over 0.1 and under 0.20, is used. A metallic layer 2 comprising zinc or aluminum alone or two kinds of zinc and aluminum is applied to the surface of this polypropylene film 1. And a heavy edge construction 4 is to be employed where the thickness of this metallic layer 2 so that the edge of the lead takeout side is thicker than a normal part 3. Further, the film resistance of the normal part 3 of this metallic layer 2 is set in a range over 6OMEGA/square and under 50OMEGA/square and the film resistance of the heavy edge part 4 in a range over 1.0OMEGA and under 5.0OMEGA/square. |
