PPG patents fluorescent colorants

January 12, 2009

Patent No. U.S. 7,338,704 B2
PPG Industries has obtained a patent for a coating composition for applying to a substrate comprised of a resinous binder having dispersed therein colorants and reflective pigments, wherein the colorants absorb visible light at a first wavelength band and produce fluorescent light at a second wavelength band when exposed to visible light, the coating composition exhibiting a first appearance on face dominated by absorbance of light by the colorants and a second appearance on flop dominated by fluorescence of the colorants, wherein the concentration of the colorants in the coating composition is approximately 0.001% weight to 50% weight and wherein when the colorant comprises colorant pigments, the size of the pigment is selected so that the pigment particles will not scatter light effectively.
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