| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing a polymer solution which is applicable in an industrial scale, ensures high removability of a hydrophilic organic solvent and hydrophilic compounds such as a hydrophilic reaction byproduct generated in polymer synthesis, also ensures a high polymer recovery rate, and can be used also as a coating liquid, and a method for purifying a polymer.SOLUTION: The method for producing a polymer solution, which contains a polymer containing a unit represented by general formula (A) and a unit represented by general formula (B) and an alcohol having a ratio of the number of carbon atoms to the number of OH groups of 4-7, includes: an addition step of adding the alcohol to a polymer solution A containing the polymer and an organic solvent which dissolves the polymer and is compatible with the alcohol to obtain a polymer solution B, and an extraction step of subjecting the polymer solution B to an extraction treatment with water. |
