Adhered thermoplastic membrane roofing system
An adhered roofing system comprising a roof substrate, a thermoplastic membrane including at least one layer that includes a functionalized thermoplastic polymer, and an adhesive securing the membrane to the substrate, where the adhesive includes a cured residue of a polymer having a silicon-containing hydrolyzable terminal group.
1. An adhered roofing system comprising:
i. a roof substrate;
ii. a thermoplastic membrane including an upper thermoplastic polymer layer and a lower thermoplastic polymer layer, where the lower layer includes from about 3 to about 50 weight percent of a functionalized thermoplastic polyolefin polymer having a polar group, based upon the entire weight of the lower layer, and where the upper layer is devoid of a functionalized thermoplastic polyolefin polymer; and
iii. an adhesive securing the membrane to the substrate, where the adhesive includes a cured residue of a polymer having a silicon-containing hydrolyzable terminal group, where the lower layer of the thermoplastic membrane is in direct contact with said adhesive.
2. The roofing system of claim 1 , where the adhered roofing system is a fully-adhered roofing system.
3. The roofing system of claim 1 , where the functionalized thermoplastic polymer is maleated polypropylene.
4. The roofing system of claim 1 , where the functionalized thermoplastic polymer is a maleated propylene-based polymer.
5. The roofing system of claim 1 , where the thermoplastic membrane is a two-layered, laminated membrane.
6. The roofing system of claim 1 , where the thermoplastic membrane is a multi-layered membrane including two or more coextruded layers.
7. The roofing system of claim 1 , where the roof substrate includes an insulation board or a cover board.
8. The roofing system of claim 1 , where the roof substrate includes an existing membrane.
9. The roofing system of claim 1 , where the lower layer that includes a functionalized polymer includes from about 5 to about 25 weight percent of the functionalized polymer, based upon the entire weight of the layer that includes the functionalized polymer.
10. The roofing system of claim 1 , where the lower layer that includes a functionalized polymer includes from about 7 to about 15 weight percent of the functionalized polymer, based upon the entire weight of the layer that includes the functionalized polymer.
11. The roofing system of claim 1 , where the functionalized thermoplastic polymer is a maleated polyolefin.
12. The roofing system of claim 1 , where the polar group is selected from the group consisting of hydroxyl, carbonyl, ether, ester, halide, amine, imine, nitrile, oxirane, and isocyanate groups.
13. The roofing system of claim 1 , where the polar group is selected from carboxylic acid, anhydride, ketone, acid halide, ester, amide, and imide groups, and derivatives thereof.
14. The roofing system of claim 1 , where the functionalized thermoplastic polyolefin polymer includes at least 0.2 weight percent of a pendent polar functional group, based upon the total weight of the functionalized thermoplastic polyolefin polymer.
15. The roofing system of claim 1 , where the membrane further includes a scrim layer disposed between the upper layer and the lower layer.
16. A method for forming an adhered membrane roof system, the method comprising:
i. applying a bond adhesive to a substrate on a roof to form an adhesive layer, where the bond adhesive includes a polymer having a silicon-containing hydrolyzable terminal group; and
ii. applying a thermoplastic membrane directly to the adhesive layer, where the thermoplastic membrane includes an upper thermoplastic polymer layer and a lower thermoplastic polymer layer, where the lower layer includes from about 3 to about 50 weight percent of a functionalized thermoplastic polyolefin polymer having a polar group, based upon the entire weight of the lower layer, where the upper layer is devoid of a functionalized thermoplastic polyolefin polymer, and where the lower layer is in contact with said adhesive layer.
17. The method of claim 16 , where the substrate is completely covered with the adhesive.
18. The method of claim 16 , where the substrate is partially covered with the adhesive.
19. The method of claim 16 , where the adhesive is applied to the roof substrate in the form of a bead that is from about ¼ in to about 1 in. in diameter or thickness.
20. The method of claim 16 , where the functionalized thermoplastic polymer is maleated polypropylene.
21. The method of claim 16 , where the functionalized thermoplastic polymer is a maleated propylene-based polymer.
22. The method of claim 16 , where the lower layer includes from about 5 to about 25 weight percent of the functionalized thermoplastic polyolefin polymer, based upon the entire weight of the lower layer.