Method for producing fine particles for a twisting ball display

摘要

A precipitation liquid (6) held under temperature control is stirred at a desired speed in a glass container (3). A small amount of a raw material solution (5) having an organic raw material dissolved therein is injected into the precipitation liquid (6) by using a syringe (4) or the like to granulate fine organic particles (7) in the precipitation liquid (6). The raw material solution (5) is prepared by dissolving the organic raw material in a low-boiling point solvent having a lower boiling point than that of the precipitation liquid (6) and having a higher dissolvability for the organic raw material than that of the precipitation liquid. With this method, fine organic particles (7) having a particle size of 20 mu m to 300 mu m are obtained in the precipitation liquid (6). Thus, fine organic particles suitable for use in an electric twist ball display can be mass-produced at reduced costs without performing mechanical cutting and abrasion operations. <IMAGE>