PROBLEM TO BE SOLVED: To provide a method for manufacturing an S/O suspension which has a wide range of choice of an oil phase, is easy to increase the concentration of a water soluble solid chemical agent, and does not need a removal process of an organic solvent.SOLUTION: The method for manufacturing the S/O suspension includes: a mixing step (S2) of mixing the water soluble solid chemical agent, water, a first surfactant, a second surfactant that has an HLB value that is larger than that of the first surfactant a complexing step (S3) of removing moisture from the mixed liquid obtained by the mixing process to obtain a water soluble solid chemical agent-surfactant complex and a dispersion step (S4) of dispersing the water soluble solid chemical agent-surfactant complex to an oil phase to obtain the S/O suspension.COPYRIGHT: (C)2012,JPO&INPIT【課題】、油相の選択の幅が広く、水溶性固体薬剤の濃度を高めることが容易で、有機溶媒の除去工程を必要としないS/Oサスペンションの製造方法を提供する。【解決手段】本発明のS/Oサスペンションの製造方法は、水溶性固体薬剤と、水と、第1の界面活性剤と、該第1の界面活性剤よりも大きなHLB値を有する第2の界面活性剤と、を混合する混合工程(S2)と、該混合工程で得られた混合液から水分を除去して水溶性固体薬剤-界面活性剤の複合体を得る複合化工程(S3)と、該水溶性固体薬剤-界面活性剤の複合体を油相に分散させてS/Oサスペンションとする分散工程(S4)と、を有することを特徴とする。【選択図】図2
