| 摘要 |
PROBLEM TO BE SOLVED: To provide a capacitor-metallized polyester film, having a high breakdown voltage at a high temperature and capacitor using the same. SOLUTION: A polyester film is provided, formed of polyester (A) and polyether imide (B) and has an extrapolated glass transition start temperature in the range of 90 deg.C to less than 130 deg.C, and a safety mechanism margin part equipped with a metallized film part serving as an electrode possessed of surface resistance of 1Ω/(square) to 15Ω/(square), a free margin part having a surface resistance of 1×1010Ω/(square) or higher, and constricted parts of demarcating the metallized film part and electrically connecting the demarcated metallized parts together or electrically connecting the demarcated metallized part to the other demarcated metallized part connected to the outside is formed at least on the one side of the above polyester film for the formation of a capacitor metallized polyester film, and a capacitor using the metallized polyester film.
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