THERMOPLASTIC MEMBRANES CONTAINING EXPANDABLE GRAPHITE
A multi-layered membrane comprising a first thermoplastic first layer and a second thermoplastic layer, where the second layer includes expandable graphite.
1 . A multi-layered membrane comprising:
i. a first thermoplastic first layer; and
ii. a second thermoplastic layer, where the second layer includes expandable graphite.
2 . The membrane of claim 1 , where the membrane further includes a reinforcing scrim.
3 . The membrane of claim 1 , where the first and second layers are laminated to one another.
4 . The membrane of claim 1 , where the first layer includes at least two sub-layers that are formed by co-extrusion.
5 . The membrane of claim 4 , where at least one of the layers formed by co-extrusion includes the expandable graphite.
6 . The membrane of claim 1 , where the second layer includes at least two sub-layers that are formed by co-extrusion.
7 . The membrane of claim 6 , where at least one of the layers formed by co-extrusion includes the expandable graphite.
8 . The membrane of claim 1 , where the second thermoplastic layer includes a thermoplastic polymer, and where the second layer includes at least 5 parts by weight expandable graphite per 100 parts by weight of the thermoplastic polymer.
9 . A multi-layered thermoplastic membrane comprising:
at least one thermoplastic layer having dispersed therein expandable graphite.
10 . The membrane of claim 9 , where the at least one layer includes at least 3 percent by weight expandable graphite based on the entire weight of the layer.