| http://www.w3.org/ns/prov#value | - However, if the obtained coarse reaction product includes impurities such as a residual thiol group-containing compound and the thiol-modified monomer of the present invention needs to be purified by removing these impurities, for example, the solidified coarse reaction product may be dried and pulverized and then washed with a solvent which dissolves the impurities such as the thiol group-contain
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