| abstract |
PURPOSE: To easily obtain particles having excellent particle size uniformity, sphericity and porosity at a low cost, by dissolving a cellulose fatty acid ester and a small amount of gelatinizing agent in a solvent, forming a droplet of the solution in an aqueous medium, gelatinizing the droplet with a coagulation promoter and separating the particle from the system. n CONSTITUTION: A cellulose fatty acid ester and a gelatinizing agent for said cellulose fatty acid ester are dissolved in an organic solvent and the obtained solution is dripped into an aqueous medium under agitation to form liquid droplets. A coagulation promoter is added to the medium to convert the cellulose fatty acid ester in the droplet to a gel particle, from which the gelatinizing agent, the coagulation promoter and the solvent are removed. The organic solvent is a halogenated hydrocarbon containing a lower alcohol. The gelatinizing agent is a long-chain aliphatic carboxylic acid, a long-chain aliphatic alcohol, etc., and the coagulation promoter is a lower alcohol. n COPYRIGHT: (C)1988,JPO&Japio |