| 摘要 |
PURPOSE:To obtain the title film having excellent resistance to pinhole formation even at a low temperature, by melt-mixing a polyamide with a specified polycaprolactone, forming the melt into a film and stretching this film. CONSTITUTION:99.9-95wt.% polyamide (A) (e.g., polycaprolactam) is melt-mixed with 0.1-5wt.% polycaprolactone (B) of an MW of 5,000-100,000, and the melt is formed into an unstretched film. This film is biaxially stretched consecutively or simultaneously at a stretch ratio of 1.2-6 to obtain the title film having a thickness of 1-50mu and forms at most ten pinholes when subjected to a flex fatigue test (1,000 repeated runs at 5 deg.C). |
