Solar heat-reflective roofing granules, solar heat-reflective shingles, and process for producing the same
AssigneeCertainTeed Corporation
InventorsMing Liang Shiao, Tihana Fuss, Husnu M. Kalkanoglu, Walter T. Stephens
Life of this patent
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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.
Claims24
A process for forming bituminous roofing products with high solar heat reflectance, the process comprising:
- (a) providing a ceramic-forming material comprising at least one aluminosilicate;
- (b) forming the ceramic-forming material into green granules;
- (c) sintering the green granules at a temperature of at least 900 degrees Celsius until the crystalline content of the sintered granules is at least ten percent as determined by x-ray diffraction;
- (d) providing a bituminous roofing sheet material having an upper surface;
- and
- (e) applying the sintered granules to the upper surface of a bituminous roofing sheet material.
A process for forming bituminous roofing products with high solar heat reflectance, the process comprising:
- (a) providing a ceramic-forming material comprising at least one aluminosilicate;
- (b) providing base particles comprising material thermally stable up to a temperature of at least 900 degrees Celsius;
- (c) applying the ceramic-forming material to the base particles to form a green coating layer on the base particles to form green granules;
- (d) sintering the green granules at a temperature of at least 900 degrees Celsius until the crystalline content of the coating layer of the granules is at least ten percent as determined by x-ray diffraction;
- (e) providing a bituminous roofing sheet material having an upper surface;
- and
- (f) applying the sintered granules in the upper surface of a bituminous roofing sheet material.
A process for forming bituminous roofing products with high solar heat reflectance, the process comprising:
- (a) providing a ceramic-forming material comprising at least one aluminosilicate;
- (b) forming the ceramic-forming material into green granules;
- (c) sintering the green granules at a temperature of at least 900 degrees Celsius until the crystalline content of the sintered granules is at least ten percent as determined by x-ray diffraction;
- (d) providing a matrix material for securing the sintered granules;
- (e) forming a solar reflective sheet comprising sintered granules and matrix material;
- (f) providing a bituminous roofing sheet material with an upper surface;
- and
- (g) applying the solar reflective sheet to the upper surface of a bituminous roofing sheet material.
- (h) applying the solar reflective sheet to the upper surface of a bituminous roofing sheet material.
Dependencies are inferred from the claim text.