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US 11,692,351 B2Granted
Solar heat-reflective roofing granules, solar heat-reflective shingles and process for producing the same
AssigneeCertainTeed Corporation
InventorsMing Liang Shiao, Tihana Tresler, Husnu M. Kalkanoglu, Walter T. Stephens
Life of this patent
Estimating the term…
Abstract
A process for preparing roofing granules includes forming kaolin clay into green granules and sintering the green granules at a temperature of at least 900 degrees Celsius to cure the green granules until the crystalline content of the sintered granules is at least ten percent as determined by x-ray diffraction.
Claims16
A plurality of roofing granules, each roofing granule comprising a base particle of material thermally stable up to a first temperature of at least 900 C.;
- and
- coated on the base particle, a coating layer of sintered kaolin, sintered bauxite, or a sintered combination of kaolin and bauxite, the coating layer having a crystalline content of at least 90 percent as determined by x-ray diffraction, wherein the crystalline content is the proportion, on a weight basis, of anhydrous crystalline material.
Dependencies are inferred from the claim text.