This invention provides a W/O emulsifying composition using a organic modified clay mineral sheet-like particles and having low viscosity without separation even under high temperature. The W/O emulsifying composition of the present invention comprises:(A) an organic modified clay mineral being sheet-like particles having an average thickness equal to or lower than 0.1μm and an average long diameter of 0.5 to 5 0μm, and(B) a polyoxyalkylene/alkyl co-modified branched siliconeand the viscosity of the W/O emulsifying composition is equal to or lower than 10,000 mPa‧s. Furthermore, by incorporating (C) a glycerin siliconated at both ends, the temporal viscosity stability is improved.本發明提供一種在使用有機改質黏土礦物板狀粒子之W/O乳化組成物當中,低黏度且於高溫下不會分離之W/O乳化組成物。本發明之W/O乳化組成物之特徵為含有:(A)有機改質黏土礦物,其係平均厚度為0.1μm以下且平均長徑為0.5至50μm的板狀粒子;與(B)聚氧伸烷基-烷基共改質分枝鏈聚矽氧;並且,該W/O乳化組成物之黏度為10,000mPa‧s以下。此外,藉由調配(C)兩末端聚矽氧化甘油而改善歷時之黏度安定性。
