| http://www.w3.org/ns/prov#value | - In one example of the method for removing the catalyst, the copolymer obtained in the form of a powder-like solid by cooling the polymerization reaction solution is brought into contact with an acidic substance in the presence of a hydrophilic organic solvent with or without stirring the solution. [0093] Examples of the hydrophilic organic solvent used in this method include alcohols, such as meth
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