US4038452A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bulky non-woven fabric
Assignee: Asahi Kasei Corp
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Filing: 1975-05-07
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Granted: 1977-07-26
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Expires: 1995-05-07
Abstract
Abstract 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 3 .
Inventors
- 👤 Tadahiro Kobayashi
- 👤 Eiichi Wakita
- 👤 Hideo Fukuda
- 👤 Yukio Matsubayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:58
CPC Classifications
D; D21; D21H; D21H15/00; D21H15/02; D21H15/04; D04; D04H; D04H1/00; D04H1/40; D04H1/42; D04H1/4282; D04H1/43; D04H1/4391; D04H1/43918; D21H5/00; D21H5/12; D21H5/1218; Y; Y10; Y10S; Y10S428/00; Y10S428/904; Y10T; Y10T428/00; Y10T428/29; Y10T428/2904; Y10T428/2909; Y10T428/2913; Y10T428/2922; Y10T428/298; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T442/00; Y10T442/60; Y10T442/608; Y10T442/627; Y10T442/632; Y10T442/633
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
172 words
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 3 .
Claim 2
Dependent Claim
172 words
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 3 .
Claim 3
Dependent Claim
107 words
A bulky non-woven fabric according to claim 1 wherein said fibrillated fibers are made of a mixture of (b 1 ) 50 to 90% by weight of a polymer 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 2 ) 10 to 50% by weight of a polymer consisting essentially of, in polymerized form, 30 to 90% by weight of acrylonitrile and 10 to 70% by weight of at least one copolymerizable monoethylenically unsaturated monomer having a carboxyl group or an amide or N-alkyl substituted amide group.
Claim 4
Dependent Claim
39 words
A bulky non-woven fabric according to claim 1 wherein said copolymerizable monoethylenically unsaturated monomer having a carboxyl group or an amide group is at least one monomer selected from the group consisting of acrylic acid, methacrylic acid and acrylamide.
Claim 5
Dependent Claim
58 words
A bulky non-woven fabric according to claim 1 which consists essentially of (a) 50 to 95% by weight of said spontaneously crimped acrylonitrile polymer fibers, (b) 5 to 45% by weight of said fibrillated acrylonitrile polymer fibers and (c) 5 to 45% by weight based on the total weight of the components (a) and (b) of binder resin.
Claim 6
Dependent Claim
27 words
A bulky non-woven fabric according to claim 1 which has the dense surface texture and an air permeability of more than 7 seconds per 100cc of air.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |