US5362432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for dry spinning spandex
Assignee: Invista North America LLC
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Filing: 1993-04-02
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Granted: 1994-11-08
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Expires: 2013-04-02
Abstract
Abstract A process is provided for dry spinning a segmented polyurethaneurea at speeds as high as 900 meters/min. The process includes chain-extending an isocyanate-capped polyether glycol with a mixture of ethylenediamine and 1,2-diaminopropane, the 1,2-diaminopropane amounting to 8 to 17 mole % of the diamine mixture. The resultant spandex is particularly suited for use in women's hosiery.
Inventors
- 👤 Nathan E. Houser
- 👤 Willem Bakker
- 👤 Richard L. Dreibelbis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:15
CPC Classifications
D; D01; D01F; 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; C08G18/4858
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
161 words
A process for dry spinning polyetherbased polyurethaneurea spandex, particularly suited for use in women's knitted hosiery, the process comprising reacting methylene-bis(4-phenylisocyanate) with a poly(tetramethyleneether) glycol, at a capping ratio in the range of 1.65 to 1.95, the glycol having a number average molecular weight in the range of 1750 to 2250, to form a capped glycol having an isocyanate content in the range of 2.4 to 2.9%, reacting, in an organic solvent, the capped glycol with a mixture of ethylenediamine and 1,2-diaminopropane chain extenders, the 1,2-diaminopropane amounting to in the range of 8 to 17 mole percent of the mixture of diamine chain extenders, to form a solution of a polyurethaneurea polymer, adjusting the concentration of the polymer in the organic solvent to be in the range of 32 to 38 weight percent of the total solution, dry-spinning said solution to form filaments of textile decitex , and winding up the resultant spandex at a speed of at least 550 m/min.
Claim 2
Dependent Claim
161 words
A process for dry spinning polyetherbased polyurethaneurea spandex, particularly suited for use in women's knitted hosiery, the process comprising reacting methylene-bis(4-phenylisocyanate) with a poly(tetramethyleneether) glycol, at a capping ratio in the range of 1.65 to 1.95, the glycol having a number average molecular weight in the range of 1750 to 2250, to form a capped glycol having an isocyanate content in the range of 2.4 to 2.9%, reacting, in an organic solvent, the capped glycol with a mixture of ethylenediamine and 1,2-diaminopropane chain extenders, the 1,2-diaminopropane amounting to in the range of 8 to 17 mole percent of the mixture of diamine chain extenders, to form a solution of a polyurethaneurea polymer, adjusting the concentration of the polymer in the organic solvent to be in the range of 32 to 38 weight percent of the total solution, dry-spinning said solution to form filaments of textile decitex , and winding up the resultant spandex at a speed of at least 550 m/min.
Claim 3
Dependent Claim
65 words
A process in accordance with claim 1 wherein the number average molecular weight of the poly(tetramethyleneether) glycol is in the range of 1800 to 2200 number average molecular weight to form isocyanate-capped glycol having a NCO content in the range of 2.75 to 2.85% and the 1,2-diaminopropane amounts to in the range of 10 to 15 mole percent of the mixture of diamine chain extenders.
Claim 4
Dependent Claim
44 words
A process in accordance with claim 2 wherein the thusly produced spandex has, in combination, a break elongation of at least 450%, an as-spun set in the range of 26 to 32% and a steam set efficiency in the range of 24 to 28%.
Claim 5
Dependent Claim
17 words
A process of claim 1, 2 or 3 wherein the winding speed is at least 700 m/min.
Claim 6
Dependent Claim
19 words
A process in accordance with claim 1, 2 or 3 wherein the winding speed is at least 850 m/min.
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) | 1997-11-07 | 1998-05-09 | 1998-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-11-07 | 2002-05-09 | 2002-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-11-07 | 2006-05-09 | 2006-11-08 | $7700.00 | Window Closed / Lapsed |