Patent ID: 7651559
Filing Date: 2010-01-26
Classification: A01N,C04B,E04D,Y10T

Abstract:
1. A mineral composition comprised of at least 90 weight percent of roofing granules, wherein said roofing granules are comprised of 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, wherein said pigmented material is comprised of from about 10 to about 35 weight percent of pigment and from about 90 to about 65 weight percent of a resin, and wherein: (a) said roofing granules are comprised of amine antistrip agent; (b) at least 80 weight percent of said roofing granules have sizes in the range of from about 600 to about 1400 microns; (c) less than about 4 weight percent of said roofing granules are smaller than 250 microns; (d) said roofing granules are comprised of at least 95 weight percent of particles smaller than 1700 microns; (e) said roofing granules are comprised of at least 30 weight percent of particles smaller than 850 microns; and (f) said roofing granules are comprised of at least 3 weight percent of particles smaller than 600 microns.