US 12,391,029 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)
Filed by Holcim Technology Ltd, Zug (CH)
Filed on May 15, 2024, as Appl. No. 18/665,468.
Application 18/665,468 is a continuation of application No. 17/429,396, granted, now 11,987,025, previously published as PCT/US2020/017410, filed on Feb. 10, 2020.
Claims priority of provisional application 62/803,551, filed on Feb. 10, 2019.
Prior Publication US 2024/0300230 A1, Sep. 12, 2024
Int. Cl. B32B 27/34 (2006.01); B32B 5/02 (2006.01); B32B 7/027 (2019.01); B32B 7/12 (2006.01); B32B 27/08 (2006.01); B32B 27/12 (2006.01); B32B 27/20 (2006.01); B32B 27/32 (2006.01); E04D 5/10 (2006.01); E04D 11/02 (2006.01); E04D 5/14 (2006.01)
CPC B32B 27/32 (2013.01) [B32B 5/028 (2013.01); B32B 7/027 (2019.01); B32B 7/12 (2013.01); 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)] 20 Claims
OG exemplary drawing
 
1. A thermoplastic roofing membrane comprising:
a first thermoplastic layer laminated to a second thermoplastic layer with a reinforcing scrim disposed between the first and second thermoplastic layers;
wherein the first thermoplastic layer includes compositionally distinct coextruded layers;
wherein a first coextruded layer of the first thermoplastic layer, which forms a planar surface of the membrane and is exposed to weather upon installation, includes an ethylene-based olefinic block copolymer and a fatty acid amide, where the fatty acid amide is present at from about 0.20 wt % to about 2.0 wt % based upon the total weight of the first coextruded layer of the first thermoplastic layer, where the amount of fatty acid amide provides the planar surface with a coefficient of friction (ASTM D 1894) of less than 0.250;
wherein a second coextruded layer of the first thermoplastic layer, which is adjacent to said reinforcing scrim, includes a fatty acid amide, where the fatty acid amide is present at less than 0.20 wt % based upon the total weight of the second coextruded layer of the first thermoplastic layer;
wherein the second thermoplastic layer includes coextruded layers, wherein the coextruded layers of the second thermoplastic layer are optionally compositionally distinct coextruded layers;
wherein a first coextruded layer of the second thermoplastic layer, which is adjacent to said reinforcing scrim, optionally includes less than 0.20 wt % of a fatty acid amide based upon the total weight of the first coextruded layer of the second thermoplastic layer; and
wherein a second coextruded layer of the second thermoplastic layer, which forms a planar surface of the membrane and is adjacent to a roof when installed, includes an ethylene-based olefinic block copolymer and a fatty acid amide.