METHODS OF PHOTOPROTECTING A MATERIAL AGAINST SOLAR UV RADIATION USING PHOTONIC PARTICLES; COMPOSITIONS
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United States of America Patent
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Sep 27, 2012
app pub date -
Oct 12, 2010
filing date -
Oct 12, 2009
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Abstract
A method of photoprotecting a material against solar UV radiation by treating the material using a composition having a dispersion of photonic particles with a mean size in the range 1 μm to 500 μm, each having a diffracting arrangement of monodisperse nanoparticles or voids, the diffraction spectrum of the arrangement including a first order reflection peak in the wavelength range 250 nm to 400 nm, or by integrating the dispersion of photonic particles into the material.
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