| 摘要 |
Fatty acid is dissolved in a second solvent to prepare a fatty acid solution. The fatty acid solution is added to a dope prepared by dissolving cellulose acylate and a plasticizer in a first solvent. Thereby, a casting dope containing the fatty acid is prepared. The mass of the fatty acid to be added to the dope is in the range of 1×10-4 to 3×10-3 relative to the sum of the mass of the cellulose acylate and the mass of the plasticizer. The casting dope is discharged from a casting die to the circumferential surface of a drum to form a casting film. The casting film is peeled from the drum and dried to be a film.
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