PREPARATION OF THE PLANARIZED $SIO_2$ PARTICLES TO MAKE IDEAL $SIO_2/TIO_2$ COMPOSITE PARTICLES FOR COSMETIC PRODUCTS

  • Published : 1999.12.31

Abstract

The planarized $SiO_2$ particles were prepared by two-step reduction method of making much smaller particles, micron-sized ones, to improve spreadability, adherence, and smoothness. Various pigments known as flaky extender usually have terrace layers on their surfaces, but $SiO_2$ particles in this study exhibit a smooth surface structure. These single $SiO_2$ particles were used as core particles to prepare the composite particles coated with ultra fine $TiO_2$ particles by a homogeneous precipitation method. The thickness and the morphology of the deposited $TiO_2$ layers could be modified by adjusting the reactant concentrations, the reaction time and the temperature. The characteristics of $SiO_2/TiO_2$ composite in the field of color cosmetics are to give an UV-cut effect and to enhance the chroma of human skin color, one of optical properties.

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References

  1. U.S. Patent, 4,882,133
  2. U.S. Patent, 4,842,848
  3. SHKIZAI v.68 no.12 Yamazaki, N.
  4. SHKIZAI v.55 no.10 Nobuoka, S.
  5. SHKIZAI v.69 no.4 Akitsu, M.;Okuda, H.;Futamata, H.;Hattori, M.
  6. Fragrance Journal v.10 Tsuneo, S.
  7. Cosmetics & Toiletries magazine v.111 no.6 Emmert, R.