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US 10,597,306 B2Granted
Photocatalytic roofing granules, photocatalytic roofing products, and process for preparing same
AssigneeCertainTeed Corporation
InventorsKeith C. Hong, Gregory F. Jacobs
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Abstract
Photocatalytic roofing granules include a binder and inert mineral particles, with photocatalytic particles dispersed in the binder.
Claims13
A process for preparing a photocatalytic roofing granule, the process comprising:
- (a) providing a porous granule body comprising inert mineral particles bound together with a binder;
- and then
- (b) providing photocatalytic titanium dioxide or vanadium oxide particles within the pores of the porous granule body by
- treating the porous granule body with a suspension or slurry of photocatalytic titanium dioxide or vanadium oxide particles in a volatile medium, the suspension or slurry being drawn into the pores of the porous granule body by capillary action;
- and
- subsequently removing the volatile medium by drying to form the photocatalytic roofing granule,
- wherein the providing of the photocatalytic titanium dioxide or vanadium oxide particles within the pores of the porous granule body does not form a coating on the porous granule body.
4 more elements
Dependencies are inferred from the claim text.