	US 11,718,991 B2
	Coated roofing granules, roofing materials made therefrom and methods of preparing coated roofing granules
David D. Kragten, Burnsville, NC (US); and Daniel E. Rardon, Greencastle, PA (US)
Assigned to Specialty Granules Investments LLC, Parsippany, NJ (US)
Filed by Specialty Granules Investments LLC, Parsippany, NJ (US)
Filed on Sep. 29, 2021, as Appl. No. 17/488,925.
Application 17/488,925 is a division of application No. 16/803,544, filed on Feb. 27, 2020, granted, now 11,136,760.
Prior Publication US 2022/0018134 A1, Jan. 20, 2022
Int. Cl. E04D 1/20 (2006.01); C09D 133/04 (2006.01); E04D 1/00 (2006.01)

CPC E04D 1/20 (2013.01) [C09D 133/04 (2013.01); E04D 2001/005 (2013.01)]

20 Claims

1. A coated roofing granule comprising:

(a) a granule having a granule color; and

(b) a post-treatment coating on the granule, the post-treatment coating comprising:

(i) at least one silicon-containing oligomer or silicon-containing polymer, and

(ii) an acrylic resin having a glass transition temperature of −18° C. to 60° C.,

wherein the coating is substantially free of water, and

wherein the coated roofing granule exhibits a granule color having an L value, as measured by a Hunter L, a, and b color scale, that is 80 percent to 100 percent of an L value of the granule without the post-treatment coating.