Hydrophobic self-cleaning coating compositions
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United States of America Patent
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Apr 3, 2012
Grant Date -
Apr 28, 2011
app pub date -
Oct 26, 2009
filing date -
Oct 26, 2009
priority date (Note) -
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Abstract
Coating compositions of the present invention comprise hydrophobic particles, an alcohol, a solvent, and an effective amount of water such that coatings formed therefrom are hydrophobic. The hydrophobic particles may comprise a metal oxide, such as silica (SiO2), alumina (Al2O3), titania (TiO2), or zinc oxide (ZnO), or combinations thereof. In one embodiment, the hydrophobic particles comprise fumed silica. The amount of hydrophobic particles is in the range of from about 0.3 wt. % to about 2 wt. %. In one embodiment, the effective amount of water is at least about 0.066 wt. %. The ratio of the amount of the solvent to the amount of the alcohol is slightly less than 100, and, in another embodiment, is at least about 50 to 50. A surface treated with the composition is characterized by a water contact angle of 115° or more, and more particularly 135° or more.
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