| 摘要 |
PURPOSE:To obtain the subject film, consisting of a polycyclohexylenedimethylene terephthalate film having a specific value or below of humidity expansion coefficient and useful as microphones, speakers, etc., without causing deterioration in flatness even when used at high temperatures and humidities for a long period. CONSTITUTION:The objective film consisting of a poly-1,4 cyclohexylenedimethylene terephthalate having <=10(10<-6>/RH%), preferably <=2(10<-6>/RH%) humidity expansion coefficient beta. Furthermore, the above- mentioned film preferably has <=0.5% heat shrinkage factor after treatment at 180 deg.C for 15min and <=0.35% saturation water absorptivity. |
