| 摘要 |
PROBLEM TO BE SOLVED: To provide a refining method of a polymer for removing a low solubility component that causes development defects, and to provide a polymer solution obtained by the refining method. SOLUTION: The refining method includes: a first step of dissolving a polymer insoluble in an alkali or hardly soluble with in alkali and converted into alkali-soluble by an action of an acid, into a good solvent that dissolves the polymer to obtain a polymer solution; a second step of adding a poor solvent that does not dissolve the polymer but is compatible with the good solvent, to the polymer solution in a range not to induce sedimentation by the polymer; and a third step of filtering the polymer solution after the second step. The poor solvent is added in an amount not more than 100 parts by mass with respect to 100 parts by mass of the good solvent, and the filter used for filtration has a pore diameter of not more than 1.0μm. COPYRIGHT: (C)2010,JPO&INPIT
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