| 摘要 |
PURPOSE: To obtain a polyethylene naphthalate film having high rigidity and satisfactory thermal stability. CONSTITUTION: The film has a value of B of 0.07-0.31, provided that B=Eβ/Eα, wherein Eαis the maximum mechanical loss tangent, tanδ, of the main dispersion at around 175 deg.C and Eβis that of the subdispersion at around 100 deg.C. |
