| 摘要 |
PURPOSE:To obtain the title fine particles having a controlled narrow particle diameter distribution and a uniform particle diameter and being useful as a material for the production of carbonaceous microspheres, a material for ion exchange resin beads or powder molding, etc., by dropping a specified polymer solution into a nonsolvent and coagulating the polymer in the form of divided particles. CONSTITUTION:A polymer solution obtained by dissolving a polymer such as polyacrylonitrile in a solvent such as dimethylformamide is divided into particles by means of, for example, dropping through fine holes and dropped into a nonsolvent which does not dissolve the polymer and is mutually soluble in the solvent, such as methanol, and contacted with it to coagulate the polymer, and the coagulums are separated, dried and freed from the solvent.
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