| 摘要 |
PROBLEM TO BE SOLVED: To provide a means which can provide a quality film stably with a cost reduced by effectively using a part which is generated unavoidably in a solution film-making method and can not be used for a product. SOLUTION: In the solution film-making method in which a polymer solution in which the polymer is dissolved in a solvent is cast into the film, a product film is obtained from the produced film, and the rest is used as part of the polymer to be used for preparing the polymer solution.
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