| http://www.w3.org/ns/prov#value | - A first aspect of the present invention is a method of treating a thermoplastic resin composition containing an additive, characterized by comprising: heating and agitating the thermoplastic resin composition containing the additive together with a solvent wherein a solubility parameter (SPsolvent) is not smaller than a solubility parameter of said thermoplastic resin component+1 (SPresin+1) ((MPa
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