| 摘要 |
PURPOSE: Provided are a biaxially oriented polyester film for condenser, which can exhibit a good workability in process and an excellent progressing property, as well as more excellent electrical property and heat resistance at the same time, and a method for producing the same. CONSTITUTION: The method comprising polycondensing at least one of dicarbonic acid or terephthalate and at least one of glycols to form a resin, and molding the resin into a film, is characterized in that propionic acid derivative represented by formula 1 is added to the finally formed resin so that the resin comprises 0.01-1 wt% of phosphorus atom and 0.01-4.0 wt% of chlorine atom. In the formula 1, R1 is hydrogen, C1-C5 methyl group, substituted or unsubstituted phenyl group, cycloalkyl group, haloalkyl group, haloaryl group(wherein the substituents are C1-C5 alkyl group, metal sulfonate, or C1-C5 amine group, R2 is a substituted ethylene group, R3 is selected from bis-(4-hydroxyphenyl)propane having aryl group containing 1-8 chlorines, bis-(4-hydroxyphenyl)methane having aryl group containing 1-8 chlorines, or bis-(4-hydroxyphenyl)hexachloropropane having aryl group containing 1-8 chlorines).
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