| 摘要 |
PROBLEM TO BE SOLVED: To obtain a polyester film for capacitor excellent in withstand voltage characteristic in high-temperature and long time load, hardly causing lowering of insulation resistance and excellent in productivity by specifying between residual amount of metal and phosphorus of the polyester film. SOLUTION: This polyester film has 0.8-4M/P [M and P each represent a residual amount (equivalent) of a metal (except antimony metal) and phosphorus in polymer], 0.1-2μm maximum roughness and 0.003-0.8-μm surface roughness Ra. Furthermore, the polyester film has a polyester (urethane)-based or an acrylic resin coating film on at least one side and uses a metal layer, especially a metallized polyester film on at leas one side. |
