| 摘要 |
The aromatic polyamide film of the present invention has microdomain structures having sizes of not less than 5 nm and not more than 600 nm. The film has an easily adhesive property and is suitable for use in printed circuit boards. In addition, it is preferable for use in magnetic recording media that the surface roughness Ra is not less than 0.25 nm and less than 25 nm and the planar orientation coefficient of the film is not less than 0.16 and not more than 0.60.And, in the production method of the present invention, the relation of a time T (minute) to the thickness t (mm) is limited to the expression; 1.2t (t+1)<=T, wherein a time T means the time of from the start of the coagulation process to the peeling of the coagulated film from the support and the thickness t means the thickness of the thin filmy product on the support just after cast. By the production method, the film having the above-mentioned characteristics can be produced in good productivity.
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