Roofing granules with high solar reflectance, roofing materials with high solar reflectance, and the process of making the same
AssigneeCertainTeed Corporation
InventorsMing Liang Shiao, Jennifer A. Sharp, Gregory F. Jacobs
Life of this patent
Estimating the term…
Abstract
Roofing granules include a core having an average ultraviolet transmission of greater than sixty percent and an average near infrared reflectance of greater than sixty percent and a UV coating layer on the exterior surface. The coating provides UV opacity, while the core provides near infrared reflectance.
Claims36
Roofing granules comprising:
- (a) a core having an average ultraviolet transmission of greater than sixty percent and an average near infrared reflectance of greater than sixty percent, the core having an exterior surface, and
- (b) a UV coating layer to cover the exterior surface, the UV coating layer having an average ultraviolet transmission of less than ten percent and an average transmission in the near infrared and visible ranges of the electromagnetic spectrum of greater than sixty percent.
A process for preparing roofing granules, the process comprising:
- (a) providing cores having an average ultraviolet transmission of greater than sixty percent and an average solar reflectance of greater than sixty percent, the core having an exterior surface;
- (b) applying a UV coating composition on the exterior surface of the cores;
- (c) curing the UV coating composition to provide a coating on the exterior surface of the cores to form a UV coating layer, the UV coating having an average ultraviolet transmission of less than ten percent and an average near infrared transmission of greater than sixty percent.
A roofing granule comprising a core comprising an agglomerate comprising base particles and an agglomerate binder, the base particles having an average ultraviolet transmission of greater than about 60 percent and an average near infrared reflectance of greater than about 60 percent, and the agglomerate binder having an average ultraviolet transmission of less than 10 percent and an average transmission in the near infrared and visible ranges of the electromagnetic spectrum of greater than about 60 percent.
Dependencies are inferred from the claim text.