| US 7,595,107 B2 | ||
| Algae resistant roofing system containing silver compounds, algae resistant shingles, and process for producing same | ||
| Husnu M. Kalkanoglu, Swarthmore, Pa. (US); Keith C. Hong, Lititz, Pa. (US); Ming Liang Shiao, Collegeville, Pa. (US); and Gregory F. Jacobs, Oreland, Pa. (US) | ||
| Assigned to CertainTeed Corporation, Valley Forge, Pa. (US) | ||
| Filed on Dec. 18, 2006, as Appl. No. 11/611,939. | ||
| Claims priority of provisional application 60/597894, filed on Dec. 22, 2005. | ||
| Prior Publication US 2007/0148340 A1, Jun. 28, 2007 | ||
| Int. Cl. B32B 5/66 (2006.01) | ||
| U.S. Cl. 428—402 [428/403; 428/404; 428/405; 428/406; 428/407; 427/212; 427/213.32] | 22 Claims |
| 1. Algae-resistant roofing granules comprising:
(a) a base particle comprising an inert mineral;
(b) an exterior coating layer on the base particle, the exterior coating including biocidal particles selected from the group
consisting of:
(1) biocidal particles having an average size from about 0.1 micrometers to about 5 millimeters and having a surface coating
comprising at least one silver biocide selected from the group consisting of metallic silver and silver compounds; and
(2) microcapsules having an average size from about 200 micrometers and 5 millimeters, and having a capsule wall environmentally
degradable in a controlled manner and a core comprising a plurality of biocidal particles having an average size from about
0.1 micrometers to about 0.5 millimeters, the biocidal particles having a surface coating comprising at least one silver biocide
selected from the group consisting of metallic silver and silver compounds.
|