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US4485141A
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Polyolefin foamed fibers and process producing the same
Assignee: JNC Corp
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Filing: 1984-02-22
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Granted: 1984-11-27
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Expires: 2004-02-22
Abstract
Abstract Polyolefin foamed fibers consisting of composite fibers having a good spinnability, a small fineness and a non-waxy feeling, and a process for producing the same are provided, which foamed fibers having a structure wherein only a composite component (B) dominantly forming the fiber surface of composite fibers along the direction of the fiber axis thereof is substantially foamed and a part of the resulting foamed cells are burst open on the fiber surface, and which process comprises adding a foaming agent only to the above component (B) and combining two composite components so that the composite ratio thereof is 30/70 or higher and the theoretical average thickness of the component (B) in the cross-section of the unstretched fibers is 2 to 15 microns.
Inventors
- 👤 Isao Fujimura
- 👤 Sadaaki Nakajima
- 👤 Morio Abe
- 👤 Masahiko Taniguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:05
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/24; D01D5/247; D01D5/28; D01D5/30; D01F; D01F1/00; D01F1/02; D01F1/08; D01F8/00; D01F8/04; D01F8/06; D04; D04H; D04H1/00; D04H1/40; D04H1/42; D04H1/4282; D04H1/4291; D04H1/4382; D04H1/4391; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249975; Y10T428/29; Y10T428/2904; Y10T428/2909; Y10T428/2913; Y10T428/2922; Y10T428/2929; Y10T428/2931; Y10T428/2973; Y10T428/2975; Y10T428/2978; Y10T428/298
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
69 words
Polyolefin foamed fibers consisting of composite fibers having a single fiber fineness of 0.5 to 30 deniers and a fiber strength of 1.5 to 5.0 g/d, characterized in a structure wherein only a composite component dominantly forming the fiber surface of composite fibers along the direction of the fiber axis thereof is substantially foamed and a part of the resulting foamed cells are burst open on the fiber surface.
Claim 2
Dependent Claim
69 words
Polyolefin foamed fibers consisting of composite fibers having a single fiber fineness of 0.5 to 30 deniers and a fiber strength of 1.5 to 5.0 g/d, characterized in a structure wherein only a composite component dominantly forming the fiber surface of composite fibers along the direction of the fiber axis thereof is substantially foamed and a part of the resulting foamed cells are burst open on the fiber surface.
Claim 3
Dependent Claim
35 words
Polyolefin foamed fibers according to claim 1, which are used as short fibers of dry non-woven fabrics, having a crimp number of 5 to 15 crimps/inch and a fiber length of 30 to 180 mm.
Claim 4
Dependent Claim
29 words
Polyolefin foamed fibers according to claim 1 which are used as chopped strands for paper-making which are substantially non-crimped and have a fiber length of 1 to 20 mm.
Claim 5
Dependent Claim
12 words
Polyolefin foamed fibers according to claim 1 which are of crimped multifilaments.
Claim 6
Dependent Claim
12 words
Polyolefin foamed fibers according to claim 1 which are of non-crimped multifilaments.
Claim 7
Dependent Claim
141 words
In the process for producing composite fibers having a single fiber fineness of 0.5 to 30 deniers by stretching unstretched fibers having a single fiber fineness of 1.5 to 130 deniers to 2 to 8 times the original length thereof, a process for producing polyolefin foamed fibers which comprises adding a foaming agent substantially only to a composite component dominantly foaming the fiber surface of composite fibers along the fiber axis thereof (which component will hereinafter be abbreviated to B component), without adding any foaming agent to another composite component (which will hereinafter be abbreviated to A component), combining the composite components so that the composite proportion thereof, i.e. (A component)/(B component), is 30/70 or higher, and the theoretical average thickness of the B component in the cross-section of the unstretched fibers is in the range of 2 to 15 microns.
Claim 8
Dependent Claim
141 words
In the process for producing composite fibers having a single fiber fineness of 0.5 to 30 deniers by stretching unstretched fibers having a single fiber fineness of 1.5 to 130 deniers to 2 to 8 times the original length thereof, a process for producing polyolefin foamed fibers which comprises adding a foaming agent substantially only to a composite component dominantly foaming the fiber surface of composite fibers along the fiber axis thereof (which component will hereinafter be abbreviated to B component), without adding any foaming agent to another composite component (which will hereinafter be abbreviated to A component), combining the composite components so that the composite proportion thereof, i.e. (A component)/(B component), is 30/70 or higher, and the theoretical average thickness of the B component in the cross-section of the unstretched fibers is in the range of 2 to 15 microns.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-11-27 | 1988-05-28 | 1988-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-27 | 1992-05-28 | 1992-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-27 | 1996-05-28 | 1996-11-27 | $7700.00 | Window Closed / Lapsed |