Polyolefin thermoplastic roofing membranes with improved burn resistivity
AssigneeHolcim Technology Ltd
InventorsHao Wang, Donna Tippmann, Michael J. Hubbard, Todd Taykowski, Timothy McQuillen
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Abstract
A multi-layered thermoplastic roofing membrane comprising a planar body including at least three layers, said at least three layers including (i) a top layer that includes magnesium hydroxide dispersed within a thermoplastic resin, (ii) an upper middle layer disposed below said top layer and including magnesium hydroxide and calcium carbonate dispersed within a thermoplastic resin, and (iii) a lower layer disposed below said upper middle layer and including magnesium hydroxide and calcium carbonate dispersed within a thermoplastic resin.
Claims12
A roof system comprising:
- a roof substrate and a thermoplastic roofing membrane affixed to the roof substrate, where the thermoplastic roofing membrane is a planar body including
- (a) an upper coextrudate layer including (i) a top layer that includes magnesium hydroxide dispersed within a polyolefin-based thermoplastic resin, and (ii) an upper middle layer including magnesium hydroxide and calcium carbonate dispersed within a polyolefin-based thermoplastic resin, and
- (b) a lower extrudate layer laminated to the upper coextrudate layer and including magnesium hydroxide and calcium carbonate dispersed within a polyolefin-based thermoplastic resin, where the lower extrudate layer is closer to the roof substrate compared to the upper coextrudate layer.
Dependencies are inferred from the claim text.