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In this study, bicontinuous microemulsions (D phase) was prepared by mixing decamethyl cyclopentasiloxane (DC), which is a good solvent for silicone soils, with cosmetic grade alkyl type surfactant polyoxyethylene (8 mol) glyceryl monoisostearate (PGMI) and ethanol aqueous solution. In the pseudo ternary phase diagram of DC/PGMI/15% ethanol aqueous solution system, a ME region exists from the water corner to the center of the ternary diagram. The ME solution solubilizes at most 15% of DC. However, by replacing half the amount of DC by a polar oil cetyl isooctanoate (CIO), the ME region extended continuously from the aqueous corner to the oil-rich region (60% DC). Self-diffusion coefficient measurement by using NMR and FF-TEM observation indicated a bicontinuous structure that solubilizes a large amount of oil and water for the oil-water ratios between 3/7-7/3. Detergency of cosmetic soils containing polymeric siloxane in the ME solution showed the highest value between the oil-water ratios of 1/1 and 7/3, where the ME with bicontinuous structure exists. These results show that bicontinuous type ME containing DC provides a good solution for cleansing silicone soils.

Bicontinuous Microemulsion Type Cleansing Containing Silicone Oil. II. Characterization of the Solution and Its Application to Cleansing Agent