FILM MANUFACTURING PROCESS

摘要

PROBLEM TO BE SOLVED: To provide a film manufacturing process which reduces defects such as scratches and streaks of a film obtained and yields a polyarylene film with an excellent appearance in obtaining the film from a composition containing a polyarylene having sulfonic acid groups and an organic solvent by casting.

SOLUTION: The film manufacturing process involves a step (1) to form a coated film by coating a composition containing a polyarylene having sulfonic acid groups and an organic solvent on a substrate and drying the composition and a step (2) to reduce the content of the remaining organic solvent in the coated film. The sulfonic acid equivalent of the polyarylene is ≥0.3 meq/g. The content of the remaining organic solvent in 100 pts.wt. of the coated film obtained in the step (2) is ≤0.5 pt.wt. The peel strength between the coated film obtained in the step (2) and the substrate is 0.05-2 N/25 mm width at a pulling rate of 0.7 m/min in the 180° peel test.

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