Mineral composition
AssigneeL Hoist North America, Inc.
InventorsRobert H. Whitaker, Richard Brann, Randall P. Downing
Life of this patent
Estimating the term…
Abstract
A roofing shingle that contains a roofing granules. The roofing granules contain at least about 95 weight percent of calcium carbonate with a hardgrove grindability index of less than about 70, and from about 0.1 to about 1.0 weight percent of a pigmented material; the pigmented material contains from about 10 to about 35 weight percent of pigment and from about 90 to about 65 weight percent of a resin; and the roofing granules are coated with an amine antistrip agent.
Claims24
A shingle assembly comprised of a fiber mat and an asphaltic coating material, wherein said asphaltic coating material is comprised of asphalt, a mineral filler disposed within said asphaltic coating material, and coated roofing granules embedded within said asphaltic coating material, wherein said coated roofing granules are comprised of limestone particles that have a hardgrove grindability index of less than 70, and wherein said coated roofing granules are coated with oil.
Dependencies are inferred from the claim text.