| 摘要 |
A granular resin solid (a) that serves as a nucleus, has a particle size of 0.5 to 7 mm, and is composed of a molding thermoplastic resin, a powdered additive component (b), and a fixing resin (c) composed of a thermoplastic resin are stirred and mixed, the fixing resin (c) is melted by the frictional heat during stirring and mixing, the powdered additive component (b) is made to adhere to the surface of the granular resin solid (a) by the melted fixing resin (c), and the system is cooled while being stirred, which solidifies the fixing resin (c), thereby providing a granular additive with excellent dispersibility and a uniform particle size by an extremely simple method and at low cost. It is also possible to dissolve the fixing resin (c) in a solvent to obtain a liquid adhesive agent (d), which is then stirred and mixed into the granular resin solid (a) and the powdered additive component (b), causing the powdered additive component (b) to adhere to the surface of the granular resin solid (a), and evaporate the solvent of the liquid adhesive agent (d) by further stirring and solidify the fixing resin (c), thereby affixing the additive component (b) to the surface of the granular resin solid (a).
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