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US 10,309,111 B2Granted
Roofing granules with improved luster, roofing products including such granules, and process for preparing same
AssigneeCertainTeed Corporation
InventorsMing Liang Shiao, Van Nhan Nguyen, Emmanuel Garre
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Abstract
A coating composition including an inorganic sol material and an organic colorant is applied to mineral particles and cured at a temperature less than 200 degrees Celsius provides roofing granules with improved luster.
Claims20
A process for producing roofing granules having a cured coating layer, the process comprising:
- (a) providing base particles;
- (b) providing a coating composition comprising an inorganic sol material and at least one synthetic organic colorant, the at least one synthetic organic colorant being selected to provide a cured coating layer having an L* of less than 30;
- (c) applying the coating composition to the base particles to form a coating layer on the base particles;
- and
- (d) curing the coating layer at a temperature less than 200 degrees Celsius.
2 more elements
Dependencies are inferred from the claim text.