| 摘要 |
PCT No. PCT/JP97/02791 Sec. 371 Date Mar. 6, 1998 Sec. 102(e) Date Mar. 6, 1998 PCT Filed Aug. 8, 1997 PCT Pub. No. WO98/06776 PCT Pub. Date Feb. 19, 1998Biaxially oriented polypropylene film excellent in heat resistance and long-term dielectric properties at high temperatures, reduced insulation defects, and excellent impregnation of insulating oil into the clearance between film layers and swelling resistance when immersed in the insulating oil; in a capacitor having excellent heat resistance, dielectric properties, corona resistance, long-term thermal durability and electric current resistance, with the polypropylene film serving as dielectric; the film is a biaxially oriented polypropylene film characterized by 98 to 99.5% isotacticity, 99% or more in isotactic pentad fraction, 30 ppm or less in ash content and 0.01 to 0.4 mu m in center line average surface roughnesses on both sides.
|
