| 摘要 |
A film which is a biaxially oriented film comprising polyethylene-2,6-naphthalenedicaboxylate as a principal component, having a thermal strain ratio RMD (150) in the machine direction of the film at a temperature of 150° C. is -1.5%<=RMD (150)<=0.0% when the thermal strain ratio RMD (T) in the machine direction of the film at a temperature T° C. based on the length LMD (t) in the machine direction (MD) of the film at a temperature t° C. is defined by <?in-line-formulae description="In-line Formulae" end="lead"?>RMD(T)={[LMD(T)-LMD(35)]/LMD(35)}x100(%),<?in-line-formulae description="In-line Formulae" end="tail"?> excellent in insulation characteristics without lowering processing characteristics, especially the characteristics during hot-pressing and suitable as a dielectric for capacitors.
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