US5843357A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spandex elastomers
Assignee: Lyondell Chemical Technology LP
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Filing: 1997-09-08
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Granted: 1998-12-01
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Expires: 2017-09-08
Abstract
Abstract Spandex-type segmented polyurethane/urea elastomers having exceptional elongation, hysteresis, recovery, and other physical properties are prepared by the amine chain extension of an isocyanate-terminated prepolymer prepared by the reaction of a stoichiometric excess of isocyanate with a polyol blend comprising a low molecular weight diol having a molecular weight below 750 Da with a high molecular weight glycol which may be a 1500 Da to 20,000 Da molecular weight, ultra-low unsaturation polyoxypropylene glycol with an unsaturation of less than about 0.010 meq/g.
Inventors
- 👤 Stephen D. Seneker
- 👤 Bruce D. Lawrey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:53
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/6674; C08G18/08; C08G18/10; C08G18/12; C08G18/40; C08G18/48; C08G18/4804; C08G18/4808; C08G18/4854; C08G18/4866; Y; Y10; Y10S; Y10S528/00; Y10S528/906
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
244 words
A process for increasing throughput in the preparation of films or fibers of segmented polyurethane/urea spandex elastomers by extrusion of a segmented polyurethane/urea spandex polymer dissolved in a polar aprotic solvent, said solution having a maximum effective processing viscosity, said process comprising selecting as said segmented polyurethane/urea spandex polymer a diamine chain-extended isocyanate-terminated prepolymer prepared by reacting an excess of one or more di- or polyisocyanates with a polyol component comprising a high molecular weight polyol portion comprising one or more ultra-low unsaturation polyoxypropylene glycols, said high molecular weight polyol portion having a number average molecular weight of about 1500 Da or more, and a low molecular weight diol portion, said low molecular weight diol portion having a number average molecular weight of about 750 Da or less, wherein said spandex polymer solution has a solution viscosity which is at least 50% lower than a PTMEG-derived segmented polyurethane/urea polymer solution containing a PTMEG-derived segmented polyurethane/urea polymer prepared from the same components as said segmented polyurethane/urea spandex polymer except that said polyol component is replaced by a 2000 Da molecular weight PTMEG, both viscosities measured at 20 weight percent solids at 25° C., and increasing said solids content of said polyurethane/urea spandex polymer in said solution to a solids content higher than the solids content of said PTMEG-derived segmented polyurethane/urea contained in said solution having a maximum effective processing viscosity to provide a solution viscosity less than or equal to said maximum effective processing viscosity.
Claim 2
Dependent Claim
244 words
A process for increasing throughput in the preparation of films or fibers of segmented polyurethane/urea spandex elastomers by extrusion of a segmented polyurethane/urea spandex polymer dissolved in a polar aprotic solvent, said solution having a maximum effective processing viscosity, said process comprising selecting as said segmented polyurethane/urea spandex polymer a diamine chain-extended isocyanate-terminated prepolymer prepared by reacting an excess of one or more di- or polyisocyanates with a polyol component comprising a high molecular weight polyol portion comprising one or more ultra-low unsaturation polyoxypropylene glycols, said high molecular weight polyol portion having a number average molecular weight of about 1500 Da or more, and a low molecular weight diol portion, said low molecular weight diol portion having a number average molecular weight of about 750 Da or less, wherein said spandex polymer solution has a solution viscosity which is at least 50% lower than a PTMEG-derived segmented polyurethane/urea polymer solution containing a PTMEG-derived segmented polyurethane/urea polymer prepared from the same components as said segmented polyurethane/urea spandex polymer except that said polyol component is replaced by a 2000 Da molecular weight PTMEG, both viscosities measured at 20 weight percent solids at 25° C., and increasing said solids content of said polyurethane/urea spandex polymer in said solution to a solids content higher than the solids content of said PTMEG-derived segmented polyurethane/urea contained in said solution having a maximum effective processing viscosity to provide a solution viscosity less than or equal to said maximum effective processing viscosity.
Claim 3
Dependent Claim
29 words
The process of claim 1 wherein said spandex polymer solution viscosity determined at 20 weight percent polymer solids in dimethylacetamide at 25° C. is less than about 20,000 cps.
Claim 4
Dependent Claim
29 words
The process of claim 1 wherein said spandex polymer solution viscosity determined at 20 weight percent polymer solids in dimethylacetamide at 25° C. is less than about 15,000 cps.
Claim 5
Dependent Claim
20 words
The process of claim 1 wherein said polymer has a weight average molecular weight of about 300,000 Da or more.
Claim 6
Dependent Claim
167 words
The process of claim 1 wherein the segmented polyurethane/urea spandex polymer comprises the reaction product of: an isocyanate-terminated prepolymer having a free NCO group content of from about 0.5 percent to about 8 percent by weight, said prepolymer comprising the reaction product of: (a) a stoichiometric excess of an isocyanate component comprising one or more diisocyanates; (b) a glycol component comprising (i) a high molecular weight glycol component comprising in major part, one or more ultra-low unsaturation polyoxypropylene glycols individually having a molecular weight of between about 1500 Da and 20,000 Da and an unsaturation less than about 0.010 meq/g, and (ii) a low molecular weight diol having a molecular weight less than 750 Da, such that the average molecular weight of said glycol component is from about 1000 Da to 10,000 Da, with a chain extender comprising one or more aliphatic diamine and/or cycloaliphatic diamine chain extender(s), wherein prior to reaction with said diamine chain extender, said isocyanate-terminated prepolymer is dissolved in a polar aprotic solvent.
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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) | 2001-11-30 | 2002-06-01 | 2002-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-11-30 | 2006-06-01 | 2006-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-11-30 | 2010-06-01 | 2010-12-01 | $7700.00 | Window Closed / Lapsed |