| 摘要 |
PURPOSE:To provide a polyamide film reduced in pinhole formation, excellent in abrasion resistance, etc., and suitable as a packaging material or the like, by melt-mixing a polyamide with a specified ethylene copolymer at a specified weight ratio, forming the mixture into a film and biaxially orienting this film. CONSTITUTION:99.9-95pts.wt. polyamide (A) (e.g., nylon 6 or nylon 66) is melt- mixed with 0.1-5pts.wt. ethylene copolymer (B) comprising 95-50wt.% ethylene, 0.1-10wt.% unsaturated carboxylic acid (e.g., maleic anhydride) and 4.9-40wt.% alkyl ester of an unsaturated carboxylic acid (e.g., ethyl acrylate) and having a melt index of 0.1-60g/10min. The obtained melt is formed into a film, and this film is biaxially oriented to obtain the title film which is a biaxially oriented film of a thickness of 1-50mu and in which the number of pinholes formed when it is subjected to a flex fatigue test including repeated flex of 1,000 runs at 5 deg.C is at most 10 and a haze <=7% when subjected to the same test. |
