| 摘要 |
PROBLEM TO BE SOLVED: To obtain a film capable of forming surface microprotrusions with slight surface coarse protrusions and developing excellent surface properties by using an aromatic polysulfone and an aromatic polyamide. SOLUTION: This film comprises (A) an aromatic polyamide and (B) an aromatic polysulfone having 235-400 deg.C glass transition temperature and has <=100 coarse protrusions having >=0.27μm height/100 cm2 in at least one surface. The component B preferably has 0.2-1.2 dL/g intrinsic viscosity. The constituent ratio of the components A and B of the film is preferably 90-99.9 wt.% of the component A and 0.1-10 wt.% of the component B based on the whole film. In the film, the number of surface protrusions having 5-30 nm height is preferably 2,000,000-30,000,000/mm2. The film is suitable as a magnetic recording medium having a high output and defectless properties. |
