| 摘要 |
<p>The present invention comprises a two-layer biaxially oriented copolyester film useful for capacitor dielectrics. Such films have good winding characteristics, slipperiness, good mechanical properties, and excellent thermal stability. The two-layer biaxially oriented copolyester film comprises: (a) a two-layer biaxially oriented copolyester film, wherein at least one layer essentially consists of PENBB and which two-layer biaxially oriented copolyester film has a melting point sufficient to withstand a thermal treatment of about 260 °C for about 10 seconds or higher; and (b) an effective amount of one or more particulate materials uniformly dispersed in at least one layer of said two-layer biaxially oriented copolyester film sufficient to provide slip and good winding characteristics, whereby the average surface roughness Ra of one of said layers is ≤ 10 nm and that of the other layer is ⊃ 10 nm.</p> |
