| 摘要 |
PROBLEM TO BE SOLVED: To provide S/O/W emulsion which disperses fine S/O particles therein, contains a large content of enclosed material therein, and inhibits the leak of the enclosed material, and a manufacturing method therefor. SOLUTION: S/O suspension disperses water-soluble solid substances as particles of an average diameter of 20 nm to 10μm in an oil phase. A S/O suspension manufacturing method is to dehydrate a W/O emulsion. In the S/O/W emulsion, the S/O particles each where the water-soluble solid substances are enclosed in the oil phase are dispersed in an external water phase, and the S/O particles have an average diameter of 100 nm to 100μm. The S/O/W emulsion manufacturing method comprises making the S/O suspension permeat through a porous membrane and dispersing it in the external water phase. In a releasing method where the water-soluble solid substances are released by using the S/O/W emulsion, the osmotic pressure of the external water phase in the S/O/W emulsion is made lower than that in the saturated solubility of the water-soluble solid substances, thereby releasing the water-soluble solid substances from the oil phase. COPYRIGHT: (C)2004,JPO
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