Development of Novel Multifunctional Cosmetic Raw Materials and Their Applications. I. Characterization of a Random Copolymer of Polyoxyethylene / Polyoxypropylene Dimethyl Ether^†

Abstract

In this study, we developed novel multifunctional raw materials, polyoxyethylene/polyoxypropylene dimethyl ether (EPDME). EPDME is a random copolymer of ethylene oxide and propylene oxide. The structure of the obtained EPDME was confirmed by Infrared (IR) absorption and NMR spectra. EPDME, which dissolves in water and oil. The compound has the following effects: [1] a high moisture-retaining effect without sticky feeling, [2] a preventing effect on dry skin, and [3] an improving effect on dry skin by daily application. It was also found that the application of EPDME in combination with glycerol resulted in a synergistic effect on the dry skin. When EPDME was formulated to lipsticks (oily bases), a high moisture-retaining effect was found. EPDME is a useful cosmetic ingredient that can give a good skin care effect in both water-based formula and oil-based formula. As the polarity of EPDME can easily be controlled, it is expected to be applicable for various cosmetics in the near future.