US 11,987,025 B2
Thermoplastic roofing membranes for fully-adhered roofing systems
Hao Wang, Carmel, IN (US); and Donna C. Tippmann, Fishers, IN (US)
Assigned to Holcim Technology Ltd, Zug (CH)
Appl. No. 17/429,396
Filed by Firestone Building Products Company, LLC, Nashville, TN (US)
PCT Filed Feb. 10, 2020, PCT No. PCT/US2020/017410
§ 371(c)(1), (2) Date Aug. 9, 2021,
PCT Pub. No. WO2020/163844, PCT Pub. Date Aug. 13, 2020.
Claims priority of provisional application 62/803,551, filed on Feb. 10, 2019.
Prior Publication US 2022/0143962 A1, May 12, 2022
Int. Cl. B32B 27/32 (2006.01); B32B 5/02 (2006.01); B32B 7/027 (2019.01); B32B 27/08 (2006.01); B32B 27/12 (2006.01); B32B 27/20 (2006.01); B32B 27/34 (2006.01); E04D 5/10 (2006.01); E04D 5/14 (2006.01); E04D 11/02 (2006.01)
CPC B32B 27/32 (2013.01) [B32B 5/028 (2013.01); B32B 7/027 (2019.01); B32B 27/08 (2013.01); B32B 27/12 (2013.01); B32B 27/20 (2013.01); B32B 27/34 (2013.01); E04D 5/10 (2013.01); B32B 2264/108 (2013.01); B32B 2270/00 (2013.01); B32B 2307/3065 (2013.01); B32B 2307/546 (2013.01); B32B 2419/06 (2013.01); E04D 5/148 (2013.01); E04D 11/02 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A thermoplastic roofing membrane comprising:
a first layer and second layer, which are laminated to one another with a reinforcing scrim disposed between the first and second laminated layers;
wherein the first layer includes compositionally distinct coextruded layers;
wherein a first coextruded layer of the membrane, which forms a planar surface of the membrane that is exposed to weather upon installation, includes an ethylene-based olefinic block copolymer and a fatty acid amide;
wherein the other layers of the membrane are devoid of fatty acid amides;
wherein the fatty acid amide is present at from about 0.20 wt % to about 2.0 wt % based upon the total weight of the top layer; and
where the amount of fatty acid amide provides the planar surface with a coefficient of friction (ASTM D 1894) of less than 0.250.