Colored Roofing Granules With Increased Solar Heat Reflectance, Solar Heat-Reflective Shingles, and Process For Producing Same

Abstract

Solar-reflective roofing granules having deep-tone colors are formed by coating base mineral particles with a coating composition including an infrared-reflective pigment. Color is provided by colored infrared pigment, light-interference platelet pigment, or a metal oxide.

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       33 . A process for increasing the infrared reflectance of colored roofing granules, the process comprising: 
 (a) coating colored roofing granules with a coating composition including a coating binder and at least one infrared-reflective functional pigment selected from the group consisting of light-interference platelet pigments including mica, light-interference platelet pigments including titanium dioxide, mirrorized silica pigments based upon metal-doped silica, and alumina; and    (b) curing the coating binder to provide colored, infrared-reflective roofing granules.    
   
   
       34 . A process according to  claim 33 , the infrared reflectance of the coated roofing granules being at least about 20 percent greater than the infrared reflectance of the uncoated roofing granules, the total color difference ΔE* of the coated roofing granules relative to uncoated roofing granules being no more than  10  units.  
   
   
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