| abstract |
(57) [Summary] [Object] To provide a method for producing a film having a uniform porous structure of a polyester elastomer having excellent heat resistance, chemical resistance, moldability and the like. [Structure] A polyester elastomer comprising a crystalline polyester containing an aromatic dicarboxylic acid as a main acid component as a hard segment and a polyether and / or a low crystalline or amorphous polyester as a soft segment, A solution composition dissolved in a polar solvent miscible with water is cast on a supporting substrate, then cooled to gel the solution composition, and then the polar solvent is extracted with an aqueous solvent, Obtain a porous film. |