Mineral composition
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United States of America Patent
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Jan 26, 2010
Grant Date -
Jul 24, 2008
app pub date -
Dec 4, 2007
filing date -
Nov 4, 2005
priority date (Note) -
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Abstract
A mineral composition comprised of at least about 90 weight percent of roofing granules, at least about 50 weight percent of calcium carbonate with a hardgrove grindability index of less than about 70, from about 0.1 to about 1.0 weight percent of a pigmented material, from about 0.1 to about 1.0 weight percent of a composition for inhibiting the growth of an organism selected from the group consisting of algae, bacteria, and mixtures thereof, and less than about 100 parts per million of a metal selected from the group consisting from the group consisting of arsenic, barium, cadmium, chromium, lead, mercury, selenium, and silver, and less than about 100 parts per million of a polycyclic aromatic hydrocarbon. The mineral composition, when tested in accordance with by ASTM Standard Test D 4977-03, loses less than 5 grams of material.
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