Method of producing fine particles of organic material and electric twist ball display using the fine particles

摘要

A precipitation liquid held under temperature control is stirred at a desired speed in a glass container. A small amount of a raw material solution having an organic raw material dissolved therein is injected into the precipitation liquid by using a syringe or the like to granulate fine organic particles in the precipitation liquid. The raw material solution 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 and having a higher dissolvability for the organic raw material than that of the precipitation liquid. With this method, fine organic particles having a particle size of 20 mum to 300 mum are obtained in the precipitation liquid. 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.