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US 4,038,452 AGranted
Bulky non-woven fabric
AssigneeAsahi Kasei Kogyo Kabushiki Kaisha
InventorsTadahiro Kobayashi, Eiichi Wakita, Hideo Fukuda, Yukio Matsubayashi
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AssigneeAsahi Kasei Kogyo Kabushiki Kaisha
InventorsTadahiro Kobayashi, Eiichi Wakita, Hideo Fukuda, Yukio Matsubayashi
Estimating the term…
A bulky non-woven fabric of improved softness and uniformity in surface density, flatness and thickness is provided. The non-woven fabric comprises (a) 50 to 95% by weight of spontaneously crimped acrylonitrile polymer fibers having lengths of 4mm to 20mm and at least 20 crimps per inch of length, said acrylonitrile polymer consisting essentially of, in polymerized form, 80 to 100% by weight of acrylonitrile and 0 to 20% by weight of a copolymerizable monoethylenically unsaturated monomer, and (b) 5 to 50% by weight of fibrillated fibers of at least one acrylonitrile polymer, said acrylonitrile polymer comprising, in polymerized form, 60 to 98% by weight of acrylonitrile and 2 to 40% by weight of a copolymerizable monoethylenically unsaturated monomer having a carboxyl group or an amide or N-alkyl substituted amide group. The non-woven fabric is in the form of a web having a structure such that said spontaneously crimped fibers are entangled with both each other and with said fibrillated fibers, and having an apparent density of 0.05 to 0.25 g/cm.sup.3.
A bulky non-woven fabric comprising (a) 50 to 95% by weight of spontaneously crimped acrylonitrile polymer fibers having lengths of 4mm to 20mm and at least 20 crimps per inch of length, said acrylonitrile polymer fibers consisting essentially of, in polymerized form, 80 to 100% by weight of acrylonitrile and 0 to 20% by weight of at least one copolymerizable monoethylenically unsaturated monomer, and (b) 5 to 50% by weight of fibrillated fibers of at least one acrylonitrile polymer, said acrylonitrile polymer comprising, in polymerized form, 60 to 98% by weight of acrylonitrile and 2 to 40% by weight of at least one copolymerizable monoethylenically unsaturated monomer having a carboxyl group or an amide or N-alkyl substituted amide group, said non-woven fabric being in the form of a web having a structure such that said spontaneously crimped acrylonitrile polymer fibers are entangled with each other and are caught in and adhere to the fibrils of said fibrillated acrylonitrile polymer fibers, and having an apparent density of 0.05 to 0.25 g/cm.sup.3.
Dependencies are inferred from the claim text.