US4973647A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fiber from polyether-based spandex
Assignee: Invista North America LLC
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Filing: 1989-05-31
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Granted: 1990-11-27
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Expires: 2009-05-31
Abstract
Abstract An improved spandex fiber is provided that is particularly useful for use in tricot-knit fabrics with nylon yarns. The fiber is formed from a polyether-based spandex polymer made from a poly(tetramethylene ether) glycol of about 2,200 molecular weight which was capped with methylene-bis(4-phenylisocyanate) and the resultant product then chain extended with a diamine mixture of ethylene diamine and 2-methyl-1,5-pentanediamine in a molar ratio of about 70/30.
Inventors
- 👤 Donald D. Bretches
- 👤 Steven P. Pardini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:10
CPC Classifications
D; D01; D01F; D01F8/00; D01F8/04; D01F8/10; D01F6/00; D01F6/58; D01F6/70; C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/28; C08G18/40; C08G18/48; C08G18/4854; Y; Y10; Y10T; Y10T442/00; Y10T442/40
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
78 words
An improved fiber formed from a spandex polymer derived from a poly(tetrametheylene ether) glycol that was capped with methylene-bis( 4-phenylisocyanate) and then chain extended with a mixture of diamines that includes ethylene diamine, the improvement comprising chain extending the capped glycol with a diamine mixture consisting essentially of ethylene diamine and 2-methyl-1,5-pentanediamine, the molar concentration of the 2 methyl-1,5-pentanediamine being in the range of 28 to 32 mole percent, based on the total diamine content of the diamines.
Claim 2
Dependent Claim
78 words
An improved fiber formed from a spandex polymer derived from a poly(tetrametheylene ether) glycol that was capped with methylene-bis( 4-phenylisocyanate) and then chain extended with a mixture of diamines that includes ethylene diamine, the improvement comprising chain extending the capped glycol with a diamine mixture consisting essentially of ethylene diamine and 2-methyl-1,5-pentanediamine, the molar concentration of the 2 methyl-1,5-pentanediamine being in the range of 28 to 32 mole percent, based on the total diamine content of the diamines.
Claim 3
Dependent Claim
24 words
A fiber in accordance with claim 1 wherein the number average molecular weight of the glycol is in the range of 2,000 to 2,400.
Claim 4
Dependent Claim
45 words
A fiber in accordance with claim 2 having a break elongation of at least 400%, load powers at 100% and 200% elongations respectively of at least 6 and 16 milliNewtons/tex, a set of no more than 17% and a heat-set efficiency of at least 90%.
Claim 5
Dependent Claim
23 words
A tricot knit fabric of nylon-6 and spandex yarns in which the spandex yarns are formed from filaments in accordance with claim 3.
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) | 1993-11-26 | 1994-05-28 | 1994-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-26 | 1998-05-28 | 1998-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-11-26 | 2002-05-28 | 2002-11-27 | $7700.00 | Window Closed / Lapsed |