METHOD OF SPHERING THERMOPLASTIC SYNTHETIC RESIN

摘要

PURPOSE:To form a thermoplastic synthetic resin or elastomer into true spheres by dispersing particles of the resin or elastomer with diameters of 5-3,000mum into a medium and melting the particles while preventing the particles from fusing to one another. CONSTITUTION:A thermoplastic synthetic resin or elastomer (A) is dispersed into an organopolysiloxane (B) having a structure represented by the formula. The dispersion is gradually heated to a temp. higher than the melting point of the polymer (A) when it is noncrystalline, or to a temp. higher than the glass transition temp. of the polymer (A) when it is crystalline. The polymer (A) is thus melted in the medium (B), while the dispersion is being stirred. Because the solubility parameter of the polymer (A) and that of the medium (B) differ to such an extent that the two are incompatible or immiscible with each other, the particles of the polymer (A) do not swell during melting and dispersion. The molten particles become truly spherical during stirring due to interfacial tension.