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New Photochemistry of UV-Absorbing Chemicals in Phase-Controlled Polymer Microspheres  

Lee Jong-Suk (Amore Pacific R&D Center)
Kim Jin-Woong (Amore Pacific R&D Center)
Kim Junoh (Amore Pacific R&D Center)
Han Sang-Hoon (Amore Pacific R&D Center)
Chang Ih-Seop (Amore Pacific R&D Center)
Publication Information
Journal of the Society of Cosmetic Scientists of Korea / v.30, no.3, 2004 , pp. 361-367 More about this Journal
Abstract
In this study, a different UV (ultra-violet) ray absorption system is presented in which butyl methoxydiben-zoylmethane (BMDM, a model UV-A absorbent, 320$\~$400 nm) is stabilized in phase-controlled poly(methyl methacrylate) (PMMA) microspheres. The photochemistry of BMDM in the microspheres was investigated considering its phase characteristics therein. The analysis of a differential scanning calorimeter and X-ray diffractometer showed that the BMDM in the microspheres was present with a non-crystalline state. The phase control of BMDM in the polymer microsphere has an excellent ability to protect UV-A with maintaining its photo- and thermal stability. The results obtained in this study illustrate well that the phase control of the UV absorbents in the polymer microspheres is another key factor that de-termines its photochemistry and photostability in the final formulations.
Keywords
UV ray absorption; phase-controlled; non-crystalline; photostability; photochemistry;
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