| 摘要 |
A peeling force controller is added to a dope to be cast on a support. The peeling force controller is polycarboxylic derivatives, in which a content of said polycarboxylic acid is at most 50 wt. %. During peeling the cast dope as a film from the support, the peeling force is at most 60x9.8 (mN) per 1 cm in width of the film. Thus the film is peeled stably and speedy from the support, and the generation of metal salts of the peeling force controller is reduced such that the pollution of a film production apparatus is prevented. Accordingly, the film excellent in optical property is continuously produced at high speed.
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