Patent US4601949A successfully refreshed from Google Patents.
US4601949A
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Conjugate filaments and process for producing same
Assignee: Solutia Inc
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Filing: 1984-11-13
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Granted: 1986-07-22
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Expires: 2004-11-13
Abstract
Abstract Polyamide conjugate filaments are prepared by a spinstretch process wherein two polyamides (e.g. two nylon 66 polymers) having different terminal velocity distances are melt spun at a spinning speed of at least 1829 mpm to form filaments in which the polymers are arranged in an eccentric configuration along the length of the filaments. The filaments are then stretched in-line at a stretch ratio greater than 1.0 prior to their being collected with the processing conditions and polyamides being selected to provide filaments having a high level of high-load crimp and a low level of boiling water shrinkage. The filaments are particularly useful in the construction of stretch garments and, especially, ladies' leg hose and pantyhose.
Inventors
- 👤 Hartwig C. Bach
- 👤 William B. Black
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:13
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/28; D01D5/30; D01D5/32; D01F; D01F8/00; D01F8/04; D01F8/12; D01F8/14; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2922; Y10T428/2924; Y10T428/2925; Y10T428/2929; Y10T428/2931
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
76 words
A substantially torque-free filament comprising a first longitudinal polyamide segment and a second longitudinal polyamide segment arranged in a side-by-side configuration along the length of the filament and differing from each other in longitudinal dimensional change characteristics, said filament having a high-load crimp test value of at least 12% and a boiling water shrinkage test value such that the quotient obtained by dividing said crimp test value by said shrinkage test value is at least one.
Claim 2
Dependent Claim
76 words
A substantially torque-free filament comprising a first longitudinal polyamide segment and a second longitudinal polyamide segment arranged in a side-by-side configuration along the length of the filament and differing from each other in longitudinal dimensional change characteristics, said filament having a high-load crimp test value of at least 12% and a boiling water shrinkage test value such that the quotient obtained by dividing said crimp test value by said shrinkage test value is at least one.
Claim 3
Dependent Claim
20 words
The filament of claim 1 wherein the volume ratio of the segments is in the range of 3:1 to 1:3.
Claim 4
Dependent Claim
12 words
The filament of claim 1 wherein said quotient is at least 2.
Claim 5
Dependent Claim
14 words
The filament of claim 4 wherein said crimp test value is at least 15%.
Claim 6
Dependent Claim
12 words
The filament of claim 1 wherein said quotient is at least 3.
Claim 7
Dependent Claim
14 words
The filament of claim 6 wherein said crimp test value is at least 18%.
Claim 8
Dependent Claim
24 words
The filament of claim 1 wherein one of said segments consists essentially of a homopolyamide rand the other segment consists essentially of a copolyamide.
Claim 9
Dependent Claim
11 words
The filament of claim 7 wherein said homopolyamide is nylon 66.
Claim 10
Dependent Claim
11 words
The filament of claim 7 wherein said homopolyamide is nylon 6.
Claim 11
Dependent Claim
82 words
A substantially torque-free filament consisting essentially of two longitudinal segments arranged in an side-by-side configuration along the length of the filament and differing from each other in longitudinal dimensional change characteristics, wherein each segment consists essentially of nylon 6 or nylon 66 and said filament has a high-load crimp test value of at least 12% and a boiling water shrinkage test value such that the quotient obtained by dividing said crimp test value by said shrinkage test value is at least one.
Claim 12
Dependent Claim
82 words
A substantially torque-free filament consisting essentially of two longitudinal segments arranged in an side-by-side configuration along the length of the filament and differing from each other in longitudinal dimensional change characteristics, wherein each segment consists essentially of nylon 6 or nylon 66 and said filament has a high-load crimp test value of at least 12% and a boiling water shrinkage test value such that the quotient obtained by dividing said crimp test value by said shrinkage test value is at least one.
Claim 13
Dependent Claim
22 words
The filament of claim 10 wherein one segment consists essentially of nylon 66 and the other segment consists essentially of nylon 6.
Claim 14
Dependent Claim
13 words
The filament of claim 10 wherein both segments consist essentially of nylon 6.
Claim 15
Dependent Claim
13 words
The filament of claim 10 wherein both segments consist essentially of nylon 66.
Claim 16
Dependent Claim
12 words
The filament of claim 13 wherein said quotient is at least 3.
Claim 17
Dependent Claim
14 words
The filament of claim 14 wherein said crimp test value is at least 18%.
Claim 18
Dependent Claim
14 words
The filament of claim 15 wherein said crimp test value is at least 20%.
Claim 19
Dependent Claim
10 words
Filaments of claim 1 in the form of a yarn.
Claim 20
Dependent Claim
10 words
Filaments of claim 10 in the form of a yarn.
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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) | 1989-07-21 | 1990-01-20 | 1990-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-21 | 1994-01-20 | 1994-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-21 | 1998-01-20 | 1998-07-22 | $7700.00 | Window Closed / Lapsed |