Fire resistant composite roofing membrane
AssigneeMilliken & Company
InventorDavid E. Wenstrup
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Abstract
A composite roofing membrane containing a single ply roofing membrane containing a first membrane, a scrim, and a second membrane. The first side of the first membrane forms the upper surface of the composite roofing membrane and contains a thermoplastic polymer. The scrim has a machine and cross-machine direction and contains a yarn or fiber selected from the group consisting of polyester and glass, and a tensile strength in the machine direction is at least about 100 N/cm2. The second membrane contains a thermoplastic polymer. The composite roofing membrane also contains a fire resistant fleece containing a plurality of FR rayon staple fibers and a plurality of char scaffold fibers selected from the group consisting of partially oxidized acrylonitrile and silica staple fibers.
Claims20
A composite roofing membrane having an upper surface and a lower surface comprising, in order:
- a first membrane having a first side and a second side, wherein the first side of the first membrane forms the upper surface of the composite roofing membrane, wherein the first membrane comprises a thermoplastic polymer;
- a first scrim having a first side and a second side, wherein the first side of the first scrim and the second side of the first membrane are in intimate contact, wherein the first scrim has a machine and cross-machine direction and comprises a yarn or fiber selected from the group consisting of polyester and glass, wherein the first scrim has a construction selected from the group consisting of a knit, woven, or non-woven, and wherein the tensile strength of the first scrim in the machine direction is at least about 100 N/cm2;
- a second membrane having a first side and a second side, wherein the first side of the second membrane and the second side of the first scrim are in intimate contact, wherein the second membrane comprises a thermoplastic polymer;
- and,
- a fire resistant (FR) fleece having a first side and a second side, wherein the first side of the FR fleece and the second side of the second membrane are in intimate contact, wherein the second side of the FR fleece forms the lower surface of the composite roofing membrane, wherein the FR fleece comprises a plurality of FR rayon staple fibers and a plurality of char scaffold fibers selected from the group consisting of partially oxidized acrylonitrile and silica staple fibers.
A composite roofing membrane having an upper surface and a lower surface comprising, in order:
- a first membrane having a first side and a second side, wherein the first side of the first membrane forms the upper surface of the composite roofing membrane, wherein the first membrane comprises a thermoplastic polymer;
- a first scrim having a first side and a second side, wherein the first side of the first scrim and the second side of the first membrane are in intimate contact, wherein the first scrim has a machine and cross-machine direction and comprises a yarn or fiber selected from the group consisting of polyester and glass, wherein the first scrim has a construction selected from the group consisting of a knit, woven, or non-woven, and wherein the tensile strength of the first scrim in the machine direction is at least about 100 N/cm2;
- a second membrane having a first side and a second side, wherein the first side of the second membrane and the second side of the first scrim are in intimate contact, wherein the second membrane comprises a thermoplastic polymer;
- and,
- a fire resistant (FR) fleece having a first side and a second side, wherein the first side of the FR fleece and the second side of the second membrane are in intimate contact, wherein the second side of the FR fleece forms the lower surface of the composite roofing membrane, wherein the FR fleece comprises a plurality of FR rayon staple fibers and a plurality of char scaffold fibers selected from the group consisting of partially oxidized acrylonitrile and silica staple fibers, wherein the FR fleece further comprises a second scrim embedded into the fleece, wherein the second scrim has a machine and cross-machine direction and comprises a plurality of glass fibers, wherein the second scrim has a construction selected from the group consisting of a knit, woven, or non-woven, and wherein the tensile strength of the second scrim in the machine direction is at least about 100 N/cm2.
Dependencies are inferred from the claim text.