US 11,987,986 B2
Multi-layered thermoplastic roofing membranes
Hao Wang, Carmel, IN (US); Donna C. Tippmann, Fishers, IN (US); and Michael J. Hubbard, Goshen, IN (US)
Assigned to Holcim Technology Ltd, Zug (CH)
Appl. No. 17/421,751
Filed by Holcim Technology Ltd, Zug (CH)
PCT Filed Jan. 14, 2020, PCT No. PCT/US2020/013529
§ 371(c)(1), (2) Date Jul. 9, 2021,
PCT Pub. No. WO2020/150252, PCT Pub. Date Jul. 23, 2020.
Claims priority of provisional application 62/792,699, filed on Jan. 15, 2019.
Claims priority of provisional application 62/792,299, filed on Jan. 14, 2019.
Prior Publication US 2022/0090382 A1, Mar. 24, 2022
Int. Cl. E04D 5/10 (2006.01); B32B 27/08 (2006.01); B32B 27/12 (2006.01); B32B 27/20 (2006.01); B32B 27/32 (2006.01); B32B 37/15 (2006.01); C08F 10/02 (2006.01); C08K 3/34 (2006.01); C08K 3/36 (2006.01)
CPC E04D 5/10 (2013.01) [B32B 27/08 (2013.01); B32B 27/12 (2013.01); B32B 27/20 (2013.01); B32B 27/32 (2013.01); B32B 37/153 (2013.01); B32B 2250/05 (2013.01); B32B 2250/242 (2013.01); B32B 2250/40 (2013.01); B32B 2307/308 (2013.01); B32B 2307/732 (2013.01); B32B 2419/06 (2013.01); C08F 10/02 (2013.01); C08K 3/346 (2013.01); C08K 3/36 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A multi-layered membrane comprising:
(i) a top layer including an ethylene-based olefinic block copolymer;
(ii) an upper-middle layer including a propylene-based elastomer;
(iii) a lower-middle layer propylene-based elastomer; and
(iv) a bottom layer including an ethylene-based olefinic block copolymer, said top layer and said bottom layer forming said skin layers, and said upper-middle layer and said lower-middle layer forming said core layers, where the skin layers include at least 40 weight % an ethylene-based olefinic block copolymer based on the total polymeric content of the layer, where the core layers includes greater than 15% by weight propylene-based elastomer based on the polymeric content of the layers, where the top layer includes greater than 25% by weight magnesium hydroxide based upon the entire weight of the layer, and where the core layers include greater than 25% by weight calcium carbonate based upon the entire weight of the layer, wherein the top and bottom layers are substantially devoid of propylene-based elastomer.