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US5644015A Expired / Lapsed US ⏱️ 0.0 years remaining

Process of manufacturing improved polyurethane fiber polymer

Assignee: Hyosung T&C Co Ltd
•
Filing: 1996-07-24
•
Granted: 1997-07-01
•
Expires: 2016-07-24
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Abstract

Abstract The present invention relates to a process of producing a polymer suitable for manufacturing spandex filament having remarkable elastic recovery rate and heat-setting efficiency wherein the process comprises: stirring a mixture of a glycol and a diisocyante, where the molar ratio of diisocyanate to glycol is 1.5 to 1.64, in a homogenizer at about 40° to about 50° C. and reacting said mixture to give a first polymer containing less than 4 mole % of unreacted diisocyanate; then, reacting said polymer with a chain-extender mixture containing ethylenediamine, 1,2-diaminopropane, and diethylenetriamine, preferably, about 74 to about 80 mole % of ethylenediamine, about 19 to about 25 mole % of 1,2-diaminopropane and about 0.2 to about 0.8 mole % of diethylenetriamine. Elastic polyurethaneurea-based spandex filament is produced by dry-spinning the polymer.

Inventors

  • 👤 Seung-Won Seo
  • 👤 Mun-Seon Kim

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-29 02:52
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; Y; Y10; Y10S; Y10S528/00; Y10S528/906

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 69 words
A process for producing a polymer suitable for manufacturing polyurethane-based filament comprising: stirring a mixture of a glycol and a diisocyante, where the molar ratio of diisocyanate to glycol is about 1.5 to about 1.64, in a homogenizer and reacting said mixture to give a first polymer containing less than 4 mole % of unreacted diisocyanate; then reacting said polymer with a chain-extender mixture containing ethylenediamine, 1,2-diaminopropane and diethylenetriamine.
Claim 2
Dependent Claim 69 words
A process for producing a polymer suitable for manufacturing polyurethane-based filament comprising: stirring a mixture of a glycol and a diisocyante, where the molar ratio of diisocyanate to glycol is about 1.5 to about 1.64, in a homogenizer and reacting said mixture to give a first polymer containing less than 4 mole % of unreacted diisocyanate; then reacting said polymer with a chain-extender mixture containing ethylenediamine, 1,2-diaminopropane and diethylenetriamine.
Claim 3
Dependent Claim 39 words
A process according to claim 1 wherein said chain-extender mixture comprises about 74 to about 80 mole % of ethylenediamine, about 19 to about 25 mole % of 1,2-diaminopropane and about 0.2 to about 0.8 mole % of diethylenetriamine.
Claim 4
Dependent Claim 20 words
A process according to claim 1 wherein polytetramethylene ether glycol (number average molecular weight: 1700-2000) is used as the glycol.
Claim 5
Dependent Claim 13 words
A process according to claim 1 wherein p,p'-methylenediphenyldiisocyanate is used as the diisocyanate.
Claim 6
Dependent Claim 25 words
A process according to claim 1 wherein the mixture of glycol and diisocyanate is stirred in a homogenizer at about 40° to about 50° C.
Claim 7
Dependent Claim 27 words
A process of manufacturing an elastic polyurethane-based spandex filament wherein the polymer produced by the process of claim 1 is dry spun at 220° to 280° C.
Claim 8
Dependent Claim 41 words
A process according to claim 6 wherein the elastic recovery rate of said elastic filament before heat-setting treatment is in the range of 19.5 to 24% and the elastic recovery rate after heat-setting treatment is in the range 13 to 18%.

References Cited (Backward Citations)

US3111368A Cited
US5000899A Cited
US4973647A Cited
US5545707A Cited
US5362432A Cited
US5516872A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 2000-06-30 2000-12-30 2001-07-01 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2004-06-30 2004-12-30 2005-07-01 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2008-06-30 2008-12-30 2009-07-01 $7700.00 Window Closed / Lapsed

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