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KMID : 0604520190450020199
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Journal of the Society of Cosmetic Scientists of Korea
2019 Volume.45 No. 2 p.199 ~ p.208
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Development of Water-Resistant O/W Emulsion-Typed Sunscreening Cosmetics through Triblock Polymeric Surfactant-Mediated Re-emulsification Inhibition
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Lee Ji-Hyun
Hong Sung-Yun
Lee Jin-Yong
An So-Youn
Lee Hyo-Jin
Kim Sung-Yong
Lee Jun-Bae
Kim Jin-Woong
Shin Kyoung-Hee
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Abstract
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This study reports water-resistant oil-in-water (O/W) emulsion-based sunscreening formulations prepared using a poly(ethylene glycol)-poly(ε-caprolactone)-poly(ethylene glycol) (PEG-PCL-PEG) triblock polymeric surfactant. As a result of a variety of outdoor recreational activities such as swimming and hiking, consumer needs for development of advanced water-resistant sunscreen formulations are increasing. Water-resistant sunscreens are mostly based on water-in-oil (W/O) emulsions, because they should not be wiped off by water or sweat. However, the W/O emulsion formulations have a disadvantage in that the feeling of use is oily and difficult to remove. On the other hand, the O/W emulsion formulations are excellent in achieving the better skin feel as well as the easier removal. However, it is difficult to provide the O/W emulsion formulations with the water-repelling performance, since re-emulsification likely occurs upon getting touch with water. To solve this problem, this study proposes a O/W emulsion-based sunscreen formulation, a triblock polymeric surfactant having relatively high interfacial tension HLB value (~ 10). This allows the sunscreen formulations to exhibit the improved water repellence function by preventing their re-emulsification. The sunscreen formation system prepared in this study would be useful for diversification of functional sunscreen products, taking advantages of its excellent emulsion stability, UV protection performance, long lasting water-resistant function and selective cleansing effect with only foam cleanser.
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KEYWORD
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triblock copolymer surfactant, water-resistant sunscreen, interfacial tension, re-emulsification, O/W emulsion
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