| 摘要 |
A method for producing an aqueous solution of a polymer having a phosphorylcholine group in which a polymerizable composition containing a polymerizable monomer having the phosphorylcholine group represented by the formula (1) is polymerized in the presence of a non-metal polymerization initiator soluble in a water-containing medium, to obtain a crude polymer aqueous solution, and the crude polymer aqueous solution is purified with a separation membrane, and an aqueous solution of the polymer having the phosphorylcholine group obtained by the method and having not more than 2000 ppm of impurities.(X: a divalent organic residue, Y: an alkyleneoxy group having C1 to 6, Z: H, R5-O-CO-(R5: an alkyl group of C1 to 10), R1:H, CH3, R2, R3, R4: H, a hydrocarbon group or a hydroxy substituted hydrocarbon group of C1 to 6, m; 0 or 1)
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