Roofing membranes and related methods
Some embodiments relate to a roofing membrane. The roofing membrane comprises a scrim. The scrim has a top surface and a bottom surface. The roofing membrane comprises a cap layer on the top surface of the scrim. The cap layer comprises a first non-styrenic polypropylene polymer, a first polypropylene impact copolymer, and a first olefin block copolymer. The roofing membrane comprises a core layer on the bottom surface of the scrim. The core layer comprises a second non-styrenic polypropylene polymer, a second polypropylene impact copolymer, and a second olefin block copolymer. The roofing membrane is configured to prevent migration of at least one oil from a layer to the roofing membrane. Some embodiments relate to a roofing structure comprising the roofing membrane, a method for installing the roofing membrane, and the like.
1. A roofing membrane comprising:
a cap layer,
wherein the cap layer comprises:
a first non-styrenic polypropylene copolymer;
a first polypropylene impact copolymer; and
a first olefin block copolymer,
wherein the cap layer comprises no greater than 10% by weight of the first olefin block copolymer based on a total weight of the cap layer;
a core layer,
wherein the core layer comprises:
a second non-styrenic polypropylene copolymer;
a second polypropylene impact copolymer; and
a second olefin block copolymer; and
a scrim between the cap layer and the core layer.
2. The roofing membrane of claim 1 , wherein the cap layer comprises 10% to 90% by weight of the first non-styrenic polypropylene copolymer based on the total weight of the cap layer.
3. The roofing membrane of claim 1 , wherein the cap layer comprises 10% to 90% by weight of the first polypropylene impact copolymer based on the total weight of the cap layer.
4. The roofing membrane of claim 1 , wherein the cap layer comprises 1% to 10% by weight of the first olefin block copolymer based on the total weight of the cap layer.
5. The roofing membrane of claim 1 , wherein the core layer comprises 10% to 90% by weight of the second non-styrenic polypropylene copolymer based on a total weight of the core layer.
6. The roofing membrane of claim 1 , wherein the core layer comprises 10% to 90% by weight of the second polypropylene impact copolymer based on a total weight of the core layer.
7. The roofing membrane of claim 1 , wherein the core layer comprises no greater than 10% by weight of the second olefin block copolymer based on a total weight of the core layer.
8. The roofing membrane of claim 1 , wherein a weight ratio of the first polypropylene impact copolymer to the first non-styrenic polypropylene copolymer is 1:1 to 1:5.
9. The roofing membrane of claim 1 , wherein a weight ratio of the second polypropylene impact copolymer to the second non-styrenic polypropylene copolymer is 1:10 to 1:15.
10. The roofing membrane of claim 1 , wherein a weight ratio of the first polypropylene impact copolymer to the first olefin block copolymer is 1:100 to 1:2.
11. The roofing membrane of claim 1 , wherein a weight ratio of the first polypropylene impact copolymer to the first olefin block copolymer is 2:1 to 100:1.
12. The roofing membrane of claim 1 , further comprising an adhesive layer on a bottom surface of the core layer.
13. A roofing membrane comprising:
a cap layer,
wherein the cap layer comprises:
a first non-styrenic polypropylene copolymer;
a first polypropylene impact copolymer; and
a first polypropylene elastomer,
wherein the cap layer comprises no greater than 10% by weight of the first polypropylene elastomer based on a total weight of the cap layer;
a core layer,
wherein the core layer comprises:
a second non-styrenic polypropylene copolymer;
a second polypropylene impact copolymer; and
a second polypropylene elastomer; and
a scrim between the cap layer and the core layer.
14. The roofing membrane of claim 13 , wherein a weight ratio of the first polypropylene impact copolymer to the first non-styrenic polypropylene copolymer is 1:1 to 1:5.
15. The roofing membrane of claim 13 , wherein the first polypropylene elastomer is a random polypropylene copolymer comprising polypropylene units with random distribution of alpha-olefin units.
16. The roofing membrane of claim 13 , wherein a weight ratio of the second polypropylene impact copolymer to the second non-styrenic polypropylene copolymer is 1:10 to 1:15.
17. The roofing membrane of claim 13 , wherein the second polypropylene elastomer is a random polypropylene copolymer comprising polypropylene units with random distribution of alpha-olefin units.
18. A method of installing a roofing membrane comprising:
obtaining a roofing membrane,
wherein the roofing membrane comprises:
a cap layer,
wherein the cap layer comprises:
a first non-styrenic polypropylene copolymer;
a first polypropylene impact copolymer; and
a first olefin block copolymer,
wherein the cap layer comprises no greater than 10% by weight of the first olefin block copolymer based on a total weight of the cap layer;
a core layer,
wherein the core layer comprises:
a second non-styrenic polypropylene copolymer;
a second polypropylene impact copolymer; and
a second olefin block copolymer;
a scrim between the cap layer and the core layer;
an adhesive layer on a bottom surface of the core layer; and
applying the adhesive layer of the roofing membrane to a roofing substrate.
19. The method of claim 18 , wherein the applying comprises adhering.
20. The method of claim 18 , wherein the roofing substrate comprises at least one of plywood, cement, concrete, asphaltic shingles, compressed fiberboard, gypsum, oriented strand board, concrete masonry units, masonry blocks, bricks, polyiso foam, polyisocyanurate, steel, aluminum, copper, minerals, limestone, thermoplastic polyolefin, polyvinyl chloride, silicone, polyvinylidene fluoride, polymethyl methacrylate, acrylic or combinations thereof.