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US 12,195,973 B2Granted
Flame-resistant composite substrates for bituminous membranes
AssigneePOLITEX s.a.s. di FREUDENBERG POLITEX s.r.l.
InventorLuigi Rocchetta
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Abstract
A porous composite substrate for producing bituminous membranes, comprising a first nonwoven and a second nonwoven layer which comprise polyester fibers, and an intermediate nonwoven layer comprising organic flame-resistant fibers. A combustion temperature of the organic flame-resistant fibers is at least 500° C. and/or a limiting oxygen index (LOI) of the organic flame-resistant fibers is at least 25%. The composite substrate is mechanically consolidated.
Claims21
A porous composite substrate for producing bituminous membranes, comprising
- a first nonwoven and a second nonwoven layer which comprise polyester fibers, and
- an intermediate nonwoven layer comprising organic flame-resistant fibers, wherein a combustion temperature of the organic flame-resistant fibers is at least 500° C. and/or a limiting oxygen index (LOI) of the organic flame-resistant fibers is at least 25%,
- wherein the composite substrate is mechanically consolidated,
- wherein a linear density of the organic flame-resistant fibers of the intermediate nonwoven layer is from 0.5 to 20 dtex, and
- wherein no inorganic flame-resistant nonwoven fibers are present in the intermediate layer.
2 more elements
Dependencies are inferred from the claim text.