US4874666A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyolefinic biconstituent fiber and nonwove fabric produced therefrom
Assignee: Unitika Ltd
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Filing: 1988-01-12
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Granted: 1989-10-17
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Expires: 2008-01-12
Abstract
Abstract A biconstituent fiber having good spinnability, a binder fiber made thereof, and a nonwoven fabric produced therefrom and which has high tensile strength and comfortable soft touch are provided. The biconstituent fiber is composed of linear low-density polyethylene and crystalline polypropylene and may be hollow or flat in cross section. A binder fiber may be produced from a bicomponent structure in which the biconstituent fiber serves as a sheath component and polyethylene terephthalate as a core component.
Inventors
- 👤 Eiichi Kubo
- 👤 Koichi Nagaoka
- 👤 Yoshiki Miyahara
- 👤 Syunichi Kiriyama
- 👤 Yasunobu Mishima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:17
CPC Classifications
D; D01; D01F; D01F8/00; D01F8/04; D01F8/06; D04; D04H; D04H1/00; D04H1/40; D04H1/54; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2973; Y10T428/2975; Y10T428/298
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
119 words
A biconstituent fiber produced by melt-spinning a blend comprising 99 to 50 wt % of a linear low-density polyethylene that is a linear low-density copolymer of ethylene and at least one α-olefin having 4 to 8 carbon atoms substantially present in an amount of 1 to 15 wt % and which has a density of 0.900 to 0.940 g/cm 3 , a melt index of 25 to 100 g/10 min as measured by the method specified in ASTM D-l238(E), and a heat of fusion of at least 25 cal/g, and 1 to 50 wt % of a crystalline polypropylene having a melt flow rate of less than 20 g/10 min as measured by the method specified in ASTM D-l238(L).
Claim 2
Dependent Claim
119 words
A biconstituent fiber produced by melt-spinning a blend comprising 99 to 50 wt % of a linear low-density polyethylene that is a linear low-density copolymer of ethylene and at least one α-olefin having 4 to 8 carbon atoms substantially present in an amount of 1 to 15 wt % and which has a density of 0.900 to 0.940 g/cm 3 , a melt index of 25 to 100 g/10 min as measured by the method specified in ASTM D-l238(E), and a heat of fusion of at least 25 cal/g, and 1 to 50 wt % of a crystalline polypropylene having a melt flow rate of less than 20 g/10 min as measured by the method specified in ASTM D-l238(L).
Claim 3
Dependent Claim
19 words
A biconstituent fiber as claimed in claim 1, wherein said α-olefin having 4 to 8 carbon atoms is octene-1.
Claim 4
Dependent Claim
20 words
A biconstituent fiber as claimed in claim 1, wherein said fiber has a fineness of no greater than 5 deniers.
Claim 5
Dependent Claim
16 words
A biconstituent fiber as claimed in claim 1, wherein said fiber is composed of continuous filaments.
Claim 6
Dependent Claim
24 words
A biconstituent fiber as claimed in claim 1, wherein said fiber is composed of staple fibers, provided with 10 to 40 crimps per inch.
Claim 7
Dependent Claim
23 words
A biconstituent fiber as claimed in claim 1, wherein said hollow fiber has a hollowness of 3 to 50% in its cross section.
Claim 8
Dependent Claim
20 words
A biconstituent fiber as claimed in claim 1, wherein said flat fiber has a flatness degree of 1.5 to 4.0.
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) | 1992-10-16 | 1993-04-17 | 1993-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-16 | 1997-04-17 | 1997-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-16 | 2001-04-17 | 2001-10-17 | $7700.00 | Window Closed / Lapsed |