This technology was presented at the 68th Divisional Meeting on Colloid and Interface Chemistry on September 7, 2017 in Kobe, Japan and at the 56th Annual Meeting of the Japan Oil Chemists' Society on September 11, 2017 in Tokyo, in which a Shiseido researcher, Yuki Sugiyama received the Young Researcher Encouragement Award of Japan Oil Chemists' Society, Kanto branch. The new emulsification technology will be applied to selected ANESSA products to be launched in February 2018.
Emulsification plays an esssential role in the development of smooth, high-quality lotions, emulsions and creams, in order to overcome the limitations of conventional emulsification methods that require surfactants or inorganic powders, Shiseido has developed a novel hydrophobic/hydrophilic polymer-particle emulsifier, "core-corona particle." Core-corona particles, more than hundred-fold larger in diameter compared to conventional surfactants, consist of an inner "core" framework with hydrophobic properties and an outer "corona" possessing hydrophilic properties. Core-corona particles realize oil-in-water emulsification with the unprecedented freedom in choice of formulation, which far exceeds what conventional emulsifiers could offer.
Furthermore, core-corona particles create a supreme texture with less sticky or powdery feel as they are softer than inorganic powders used in Pickering emulsion and can emulsify oil and water at a far lower concentration. According to Shiseido, the core-corona emulsion technology offers versatility in cosmetics application and enables chemists to create innovative formulas such as sunscreens with a dewy refreshing texture and high water resistance, and highly effective moisturizing cream without a sticky feel.