| 摘要 |
PROBLEM TO BE SOLVED: To produce spherical particles which are almost perfect spheres by means of a gelation method. SOLUTION: In the method for producing particles, the surface of reaction liquid is covered with a cushion layer and raw material liquid is dropped to the cushion layer on the basis of the external gelation method. Preferably, the surface of the reaction liquid is covered with an air bubble layer of the reaction liquid, the height of the air bubble layer is 1 mm to 50 mm, the air bubble layer is formed of minute air bubbles of average particle size 4 mm or less. Otherwise, preferably, surface viscosity of the air bubble layer is 20 - 150 g/sec and bubble life of the air bubble layer is 30 - 150 sec. In the method for producing gel particle, the raw material liquid is dropped to the cushion layer formed of the air bubble layer above described. The spherical particles produced by this method has a sphericity less than 1.4. COPYRIGHT: (C)2005,JPO&NCIPI
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