US5000899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spandex fiber with copolymer soft segment
Assignee: Invista North America LLC
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Filing: 1988-05-26
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Granted: 1991-03-19
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Expires: 2008-05-26
Abstract
Abstract A elastic fibers are formed from spandex polymer that is prepared by reacting a glycol prepared from a tetrahydrofuran/3-methyltetrahydrofuran copolymer with a diisocyanate and then chain extending the thusly capped glycol with a particular mixture of diamines. The fibers have a highly desirable combination of power, hot-wet creep and heat-set efficiency and can be prepared at high spinning and windup speeds.
Inventors
- 👤 Richard L. Dreibelbis
- 👤 Nathan E. Houser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:41
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; D01F6/78; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2964; Y10T428/2967
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
94 words
In a dry-spun elastic fiber of polyether-based polyurethane-urea spandex polymer having soft and hard segments, the polymer being the product of a hydroxyl-terminated copolymer of tetrahydrofuran and 3-methyltetrahydrofuran that was capped with p,p'-methylene diphenyl diisocyanate and then chain-extended with diamine, the improvement comprising the hydroxyl-terminated copolymer containing 4 to 20 mole percent of 3-methyltetrahydrofuran, the chain extenders being a mixture of ethylene diamine and 2-methylpentamethylene diamine coextender, the coextender amounting to 20 to 50 mole percent of the diamine mixture, and the hard segment amounting to 5.5 to 9 mole percent of the polymer.
Claim 2
Dependent Claim
94 words
In a dry-spun elastic fiber of polyether-based polyurethane-urea spandex polymer having soft and hard segments, the polymer being the product of a hydroxyl-terminated copolymer of tetrahydrofuran and 3-methyltetrahydrofuran that was capped with p,p'-methylene diphenyl diisocyanate and then chain-extended with diamine, the improvement comprising the hydroxyl-terminated copolymer containing 4 to 20 mole percent of 3-methyltetrahydrofuran, the chain extenders being a mixture of ethylene diamine and 2-methylpentamethylene diamine coextender, the coextender amounting to 20 to 50 mole percent of the diamine mixture, and the hard segment amounting to 5.5 to 9 mole percent of the polymer.
Claim 3
Dependent Claim
37 words
An elastic fiber in accordance with claim 1 wherein the 2-methylpentamethylene diamine amounts to 30 to 45 mole percent of the diamine mixture, and the hard segments amount to 6 to 7.5 percent of the polymer weight.
Claim 4
Dependent Claim
148 words
In a process for preparing spandex fibers wherein the spandex polymer is formed in an organic solvent from a hydroxyl-terminated copolymer of tetrahydrofuran and 3-methyltetrahydrofuran containing 4 to 20 mole percent 3-methyltetrahydrofuran, which was capped with p,p'-methylene diphenyl diisocyanate and then chain extended with diamine and the polymer is then dry spun through orifices to form the elastic fibers, the improvement comprising the molar ratio of diisocyanate to glycol being in the range of 1.6 to 2.3, the capped glycol being chain extended with a mixture of ethylene diamine and 2-methylpentamethylene diamine coextender, the coextender amounting to 20 to 50 mole percent of the diamine mixture to provide spandex polymer having hard segments amounting to 5.5 to 9 mole percent of the polymer, pulling the dry-spun filaments at a speed of at least 400 m/min and winding up the filaments at a speed of at least 500 m/min.
Claim 5
Dependent Claim
148 words
In a process for preparing spandex fibers wherein the spandex polymer is formed in an organic solvent from a hydroxyl-terminated copolymer of tetrahydrofuran and 3-methyltetrahydrofuran containing 4 to 20 mole percent 3-methyltetrahydrofuran, which was capped with p,p'-methylene diphenyl diisocyanate and then chain extended with diamine and the polymer is then dry spun through orifices to form the elastic fibers, the improvement comprising the molar ratio of diisocyanate to glycol being in the range of 1.6 to 2.3, the capped glycol being chain extended with a mixture of ethylene diamine and 2-methylpentamethylene diamine coextender, the coextender amounting to 20 to 50 mole percent of the diamine mixture to provide spandex polymer having hard segments amounting to 5.5 to 9 mole percent of the polymer, pulling the dry-spun filaments at a speed of at least 400 m/min and winding up the filaments at a speed of at least 500 m/min.
Claim 6
Dependent Claim
54 words
A process in accordance with claim 3 wherein the molar ratio of diisocyanate to glycol is in the range of 1.8 to 2.0, the 2-methylpentamethylene diamine coextender amounts to 30 to 45 mole % of the diamine mixture, the pulling speed is at least 600 m/min and windup speed is at least 750 m/min.
Claim 7
Dependent Claim
16 words
A process in accordance with claim 4 wherein the windup speed is at least 900 m/min.
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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) | 1994-03-18 | 1994-09-17 | 1995-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-03-18 | 1998-09-17 | 1999-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-03-18 | 2002-09-17 | 2003-03-19 | $7700.00 | Window Closed / Lapsed |