Method of formulating zinc oxide powder blends for balanced UVA/UVB attenuation
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United States of America Patent
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Jul 7, 2015
Grant Date -
Jun 11, 2009
app pub date -
Dec 4, 2008
filing date -
Dec 5, 2007
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Abstract
Disclosed is a composition that comprises an effective proportion of a first metal oxide powder having a primary particle size and a secondary particle size selected for the first metal oxide powder to attenuate UVA and an effective proportion of a second metal oxide powder having a secondary particle size selected for the second metal oxide powder to attenuate UVB. The mean secondary particle size of the first metal oxide powder is greater than the mean secondary particle size of the second metal oxide powder. In one embodiment, the first and the second metal oxide powders are both zinc oxide.
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