Algae resistant roofing granules with controlled algaecide leaching rates, algae resistant shingles and process for producing same
US8039048B2 · kind B2 · utility
11Cited by
91References
19Claims
0Family size
Assignee
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Key dates
| Filing date | Nov 2, 2009 |
| Grant date | Oct 18, 2011 |
| Priority date | — |
| Expiry date | Jan 21, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2438
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A process for forming algae-resistant roofing shingles comprises producing algae-resistant granules, and adhering the granules to a shingle stock material. The algae-resistant roofing granules are produced by a process that includes coating mineral particles with a clay-silicate binder including a metal oxide algaecide and small organic particles. The particles are heated to cure the binder, and the organic particles pyrolyse to form pores in the coating. The release of the algaecide is controlled by the structure of the granules.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.