US 11,053,684 B2
Solar heat-reflective roofing granules, solar heat-reflective shingles and process for producing the same
Ming Liang Shiao, Collegeville, PA (US); Tihana Tresler, Derry, NH (US); Husnu M. Kalkanoglu, Swarthmore, PA (US); and Walter T. Stephens, Cleveland, OH (US)
Assigned to CertainTeed Corporation, Malvern, PA (US)
Filed by CertainTeed LLC, Malvern, PA (US)
Filed on Apr. 25, 2019, as Appl. No. 16/394,963.
Application 14/247,761 is a division of application No. 12/886,721, filed on Sep. 21, 2010, granted, now 8,722,140, issued on May 13, 2014.
Application 16/394,963 is a continuation of application No. 14/247,761, filed on Apr. 8, 2014, abandoned.
Claims priority of provisional application 61/244,627, filed on Sep. 22, 2009.
Prior Publication US 2019/0249434 A1, Aug. 15, 2019
Int. Cl. C04B 35/64 (2006.01); C04B 33/04 (2006.01); E04D 1/20 (2006.01); C04B 33/32 (2006.01); C04B 35/10 (2006.01); C04B 35/18 (2006.01); C04B 35/626 (2006.01); C04B 35/636 (2006.01); C03C 10/00 (2006.01); E04D 1/16 (2006.01); E04D 1/00 (2006.01)
CPC E04D 1/20 (2013.01) [C03C 10/00 (2013.01); C04B 33/04 (2013.01); C04B 33/32 (2013.01); C04B 35/10 (2013.01); C04B 35/18 (2013.01); C04B 35/62695 (2013.01); C04B 35/636 (2013.01); C04B 35/64 (2013.01); E04D 1/16 (2013.01); C04B 2235/3217 (2013.01); C04B 2235/349 (2013.01); C04B 2235/528 (2013.01); C04B 2235/5427 (2013.01); C04B 2235/5436 (2013.01); C04B 2235/5463 (2013.01); C04B 2235/5472 (2013.01); C04B 2235/5481 (2013.01); C04B 2235/95 (2013.01); C04B 2235/9646 (2013.01); C04B 2235/9661 (2013.01); E04D 2001/005 (2013.01); Y02A 30/254 (2018.01); Y02B 80/00 (2013.01); Y10T 428/24413 (2015.01); Y10T 428/24421 (2015.01)] 20 Claims
OG exemplary drawing
 
1. A process for forming bituminous roofing products with high solar heat reflectance, the process comprising:
(a) providing a ceramic-forming material comprising at least one aluminosilicate;
(b) providing base particles comprising material thermally stable up to a temperature of at least 900 degrees Celsius;
(c) applying the ceramic-forming material to the base particles to form a green coating layer on the base particles to form green granules;
(d) sintering the green granules at a temperature of at least 900 degrees Celsius until the crystalline content of the coating layer of the granules is at least ten percent as determined by x-ray diffraction;
(e) providing a bituminous roofing sheet material having an upper surface; and
(f) applying the sintered granules in the upper surface of a bituminous roofing sheet material.