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US 11,427,507 B2Granted
Mineral roofing granules and methods for making them
AssigneeCertainTeed Corporation
InventorsBojana Lante, Tracy Panzarella, Rachel Z. Pytel
Life of this patent
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AssigneeCertainTeed Corporation
InventorsBojana Lante, Tracy Panzarella, Rachel Z. Pytel
Estimating the term…
The present disclosure relates to roofing granules, such as solar-reflective roofing granules having one or more of low crystalline silica content, high stain resistance and algae resistance. The present disclosure provides a mineral roofing granule having at its mineral outer surface a first fired mixture comprising an aluminosilicate clay, the first fired material having no more than 2 wt % crystalline silica. The present disclosure also provides a mineral roofing granule having a mineral body and a mineral outer surface, the mineral roofing granule having at its mineral outer surface a first fired material, the first fired material being a first fired mixture comprising an aluminosilicate clay; one or more of a feldspar, a sodium silicate and a nepheline syenite; and, optionally, a zinc source.
A mineral roofing granule comprising a mineral body and a mineral outer surface, the mineral roofing granule having at its mineral outer surface a first fired material, the first fired material being a fired product of a first fireable mixture comprising:
A mineral roofing granule comprising a mineral body and a mineral outer surface, the mineral roofing granule having at its mineral outer surface a first fired material, the first fired material being a fired product of a first fireable mixture comprising:
A mineral roofing granule comprising a mineral body and a mineral outer surface, the mineral roofing granule having at its mineral outer surface a first fired material, the first fired material being a fired product of a first fireable mixture comprising:
Dependencies are inferred from the claim text.