US5171633A
Expired / Lapsed
US
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Elastic composite filament yarn and process for preparing the same
Assignee: Kanebo Ltd
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Filing: 1990-10-02
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Granted: 1992-12-15
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Expires: 2010-10-02
Abstract
Abstract A composite elastic filament yarn having excellent heat resistance is produced by conducting conjugate-spinning, in a core-sheath arrangement, preferably a concentric core-sheath arrangement, of a polyurethane, as a core component, which is crosslinked by a polyisocyanate at a crosslink density (Y) of 15 ηmol/g or more to thereby have improved heat resistance, and a non-polyurethane thermoplastic elastomer, as a sheath component, particularly a polyester elastomer, a polyamide elastomer or polystyrene elastomer, under such conditions that the core to sheath conjugate ratio (X) is in the range of from 3/1 to 100/1, and that the relationship of Y≧-X+35 is satisfied. This elastic yarn is free from tackiness and can be wound at a high speed. Further, the yarn is easy to unwind and its workability is excellent. This elastic yarn is suited for use in various fields, such as socks, tricots, panty hose, swimsuits and foundations.
Inventors
- 👤 Yasuo Muramoto
- 👤 Kiyoshi Yoshimoto
- 👤 Masami Fujimoto
- 👤 Yoshiaki Morishige
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:19
CPC Classifications
D; D01; D01F; D01F8/00; D01F8/04; D01F8/16; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2929; Y10T428/2931
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
68 words
A core and sheath type composite elastic filament yarn composed of a polyurethane, as a core component, and a non-polyurethane thermoplastic elastomer, as a sheath component, characterized in that a core/sheath conjugate ratio (X) is 3/1 to 100/1, said polyurethane is crosslinked at a crosslink density (Y) of at least 15 ηmol/g and said core/sheath conjugate ratio (X) and said crosslink density (Y) satisfy the following relationship: Y≧-X+35.
Claim 2
Dependent Claim
68 words
A core and sheath type composite elastic filament yarn composed of a polyurethane, as a core component, and a non-polyurethane thermoplastic elastomer, as a sheath component, characterized in that a core/sheath conjugate ratio (X) is 3/1 to 100/1, said polyurethane is crosslinked at a crosslink density (Y) of at least 15 ηmol/g and said core/sheath conjugate ratio (X) and said crosslink density (Y) satisfy the following relationship: Y≧-X+35.
Claim 3
Dependent Claim
26 words
The composite elastic filament yarn according to claim 1, wherein said polyurethane is crosslinked mainly by allophanate linkages derived by a polyisocyanate contained in said polyurethane.
Claim 4
Dependent Claim
18 words
The composite elastic filament yarn according to claim 1, wherein said conjugate ratio (X) is 10/1 to 70/1.
Claim 5
Dependent Claim
18 words
The composite elastic filament yarn according to claim 3, wherein said conjugate ratio (X) is 20/1 to 50/1.
Claim 6
Dependent Claim
18 words
The composite elastic filament yarn according to claim 1, wherein said non-polyurethane thermoplastic elastomer is a polyester-based elastomer.
Claim 7
Dependent Claim
18 words
The composite elastic filament yarn according to claim 1, wherein said non-polyurethane thermoplastic elastomer is a polyamide-based elastomer.
Claim 8
Dependent Claim
18 words
The composite elastic filament yarn according to claim 1, wherein said non-polyurethane thermoplastic elastomer is a polystyrene-based elastomer.
Claim 9
Dependent Claim
25 words
The composite elastic filament yarn according to claim 1, wherein said core component and sheath component are arranged in a concentric relation with each other.
Claim 10
Dependent Claim
30 words
The composite elastic filament yarn according to claim 1, wherein a polyisocyanate is incorporated into the core component to enhance the compatibility between the core component and the sheath component.
Claim 11
Dependent Claim
40 words
The composite elastic filament yarn according to claim 5, wherein said yarn has a temperature-elongation characteristic of 40% elongation at a temperature of at least 140° C., a load of 12.5 mg/d and a temperature increasing rate of 70° C.
Claim 12
Dependent Claim
40 words
The composite elastic filament yarn according to claim 6, wherein said yarn has a temperature-elongation characteristic of 40% elongation at a temperature of at least 130° C., a load of 12.5 mg/d and a temperature increasing rate of 70° C.
Claim 13
Dependent Claim
40 words
The composite elastic filament yarn according to claim 7, wherein said yarn has a temperature-elongation characteristic of 40% elongation at a temperature of at least 90° C., a load of 12.5 mg/d and a temperature increasing rate of 70°0 C./min.
References Cited (Backward Citations)
US4604320A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-12-15 | 1996-06-15 | 1996-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-12-15 | 2000-06-15 | 2000-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-12-15 | 2004-06-15 | 2004-12-15 | $7700.00 | Window Closed / Lapsed |