METHOD FOR PURIFYING POLYMER AND PROCESS FOR PRODUCING POLYMER USING THE METHOD

摘要

Disclosed is a method for purifying a polymer that can suppress a lowering in molecular weight of the polymer and can effectively reduce the amount of a residual catalyst which stays in the polymer. The polymer containing the residual catalyst is brought into contact with an organic acid-containing organic solvent having a pKa value in the range of 2 to 3.9, whereby the amount of the catalyst, which stays in the polymer, can be reduced and the polymer can be purified. Examples of organic acids include lactic acid.