| 摘要 |
PROBLEM TO BE SOLVED: To obtain the subject film excellent in solvent resistance (fuel resistance), good in moldability after being laminated, and capable of maintaining corrosion resistance after being molded, by using a specific copolyester and specifying the refractive index. SOLUTION: This polyester film contains a lubricant (e.g. spherical silica) having an average particle diameter of <=2.5μm, comprises a copolyester having a melting point of 210-245 deg.C, and has a refractive index of 1.505 to 1.545 in the thickness direction of the film. The copolyester is preferably an isophthalic acid-copolymerized polyethylene terephthalate. The film is obtained e.g. by melting a copolyester containing a lubricant and copolymerized with isophthalic acid, etc., extruding the melted copolymer from a die, biaxially orienting the film, and subsequently thermally setting the oriented film. |
