Algae resistant roofing granules with controlled algaecide...

Details Algae resistant roofing granules with controlled algaecide... Algae resistant roofing granules with controlled algaecide...

B - Operations, Transporting

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B32B 11/00 (2006.01) B32B 5/16 (2006.01) B32B 33/00 (2006.01) C09C 1/04 (2006.01) C09K 3/00 (2006.01) E04D 1/12 (2006.01) E04D 7/00 (2006.01) E04D 13/00 (2006.01)

Patent

CA 2471215

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.

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