US Patent 7125460 Fire resistant nonwoven batt having both charring and oxygen-depleting fibers

Disclosed are uni-layer and bi-layer FR nonwoven fiber batts formed of various blends of charring fibers such as FR treated rayon, oxygen-depleting fibers such as modacrylic fibers and nonwoven fibers such as carrier fibers and binder fibers and associated methods for forming the same. Variously, the uni-layer and bi-layer FR nonwoven fiber batts may include layers formed entirely of blends of charring fibers and nonwoven fibers, layers formed entirely of blends of oxygen-depleting fibers and nonwoven fibers and/or layers formed of blends of charring fibers, oxygen-depleting fibers and nonwoven fibers.