Provided are: an oil-in-water type emulsion composition which has excellent temporal and temperature stability and exerts a good feeling of use; and a method of producing the same. Emulsification is carried out through a specific intermediate phase formed by mixing a surfactant capable of forming an Lα phase, a surfactant capable of forming an H1 phase, and water. The intermediate phase preferably has an interfacial tension of 0.01 to 8 mN/m in terms of relative value with respect to polyperfluoromethylisopropyl ether. The oil-in-water type emulsion composition is produced by a production method that includes the step of sequentially adding an oil phase component and an aqueous phase component to the intermediate phase. In addition, it is preferred to use a combination of a first surfactant and a second surfactant, in which combination the viscosity of a mixed aqueous solution of the first and second surfactants is less than half of the sum of the viscosity values of individual aqueous solutions of the first and second surfactants at the same concentration as the total concentration of the surfactants in the mixed aqueous solution.
本文提供了一种
水包油型乳液组合物,该组合物具有极佳的时间稳定性和温度稳定性,并具有良好的使用感;还提供了一种生产该组合物的方法。乳化是通过将能形成 Lα 相的表面活性剂、能形成 H1 相的表面活性剂和
水混合形成的特定中间相进行的。相对于聚
全氟甲基异丙基醚,中间相的界面张力最好在 0.01 至 8 mN/m 之间。
水包油型乳液组合物的生产方法包括向中间相依次添加油相组分和
水相组分的步骤。此外,最好使用第一种表面活性剂和第二种表面活性剂的组合,在这种组合中,第一种和第二种表面活性剂的混合
水溶液的粘度小于在与混合
水溶液中表面活性剂总浓度相同的浓度下,第一种和第二种表面活性剂的单个
水溶液的粘度值之和的一半。