| 摘要 |
PROBLEM TO BE SOLVED: To provide a polyester films excellent in the deformation under elongation of tapes and dimensional stability under the conditions of temperature and humidity assumed for service circumstances. SOLUTION: This polyester film has ethylene terephthalate as the major component and a long period of 110-120Å, a ratio (I 847/I 874) of the peak intensity at 847 cm-1 to that at 874 cm-1 of 0.08-0.15, and a ratio (I 1041/I 874) of the peak intensity at 1041 cm-1 to that at 847 cm-1 of 0.35-0.45 in the infrared spectroscopy.
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