Cyclosiloxane attained a crucial position due to its good miscibility with various ingredients in addition to the general benefits of silicone oil. In detergent formulae, it is expected to play a key role in cleansing a soil with polymeric siloxane, which is normally hard to remove. Self-organized structure such as a microemulsion that solubilizes oil can provide a specific function as a reflection of the property of the aggregates. In this article, a new approach to prepare the microemulsion using a versatile POE alkyl type surfactant combined with cyclosiloxane in the presence of ethanol is presented. Solubilizing property of cyclosiloxane, the effect of addition of polar oil, and a structural effect of the selforganized solution on the detergency are discussed. Recent material progress strongly requires the development of physico-chemical study of detergent such as phase optimization study.

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W/O emulsions are suitable for cosmetic foundations, as they are excellent in water repellency. In particular when silicone oils are used for the oil a feeling of W/O emulsions is good. In order to obtain the structure condition as W/O type surfactants to prepare stable W/O silicone emulsions, glycerylether derivatives with silicone chains were focused on. And stable low-viscosity W/O emulsions were prepared by using the most suitable glycerylether modified silicone. And the addition of ethanol to W/O silicone emulsion gives good feeling but makes emulsion stability worse seriously. In this report, I introduced that the W/O silicone emulsion which contained ethanol was stabilized by the amphiphilic polymer (OXP-SI). The emulsion obtained from the region of the particular silicone / ethanol ratio in which the polymer was dissolved extending was stable and had elastic properties. In this paper stabilization mechanisms and the application example for cosmetic foundations are discribed.

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