US 12,410,610 B2
Flame retardant clear coatings for building panels
John E. Hughes, Lincoln University, PA (US); and Michelle X. Wang, Lititz, PA (US)
Assigned to AWI Licensing LLC, Wilmington, DE (US)
Filed by ARMSTRONG WORLD INDUSTRIES, INC., Lancaster, PA (US)
Filed on Feb. 7, 2022, as Appl. No. 17/665,813.
Application 17/665,813 is a continuation of application No. 15/994,160, filed on May 31, 2018, granted, now 11,274,439.
Claims priority of provisional application 62/513,115, filed on May 31, 2017.
Prior Publication US 2022/0154454 A1, May 19, 2022
Int. Cl. B32B 9/00 (2006.01); B32B 21/00 (2006.01); E04B 1/94 (2006.01); E04B 9/04 (2006.01); E04B 9/16 (2006.01); E04B 9/36 (2006.01); E04C 2/08 (2006.01); E04C 2/26 (2006.01); E04C 2/12 (2006.01)
CPC E04B 1/942 (2013.01) [B32B 21/00 (2013.01); E04B 9/045 (2013.01); E04B 9/16 (2013.01); E04B 9/366 (2013.01); E04C 2/08 (2013.01); E04C 2/26 (2013.01); E04C 2/12 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A flame-retardant coating composition comprising:
a coating comprising a first sub-layer, a second sub-layer atop the first sub-layer, and a third sub-layer atop the second sub-layer;
wherein the first sub-layer is an organic coating and comprises polymer produced from unsaturated monomers and the second sub-layer is an inorganic coating comprising aluminum carbonate, triethanolamine, and a blend of a first borate compound and a first phosphate compound;
wherein the aluminum carbonate is present in an amount of about 2.8 to about 4.8 wt. %;
wherein a weight ratio of first phosphate compound to the first borate compound within the second sub-layer is from about 5:1 to about 80:1;
wherein the third sub-layer is an inorganic coating composition comprising triethanolamine, a second borate compound, and a second phosphate compound; and
wherein the second borate compound is zinc borate and the first borate compound is boron trioxide.