Algae resistant roofing granules with controlled algaecide leaching rates, algae resistant shingles, and process for producing same
US7687106B2 · kind B2 · utility
6Cited by
45References
28Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 20, 2003 |
| Grant date | Mar 30, 2010 |
| Priority date | — |
| Expiry date | Jul 16, 2026 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2438
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Algae-resistant roofing granules are formed by coating mineral particles with a clay-silicate binder including a metal oxide algaecide and small organic particles. When the particles are heated to cure the binder, the organic particles pyrolyse to form pores in the coating. Release of the algaecide is controlled by the structure of the granules.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.