US5028642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Discoloration-resistant spandex
Assignee: Invista North America LLC
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Filing: 1990-02-09
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Granted: 1991-07-02
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Expires: 2010-02-09
Abstract
Abstract An improved spandex polymer composition provides fibers or films of the composition with increased heat set efficiency and greater discoloration resistance. The composition contains zinc oxide and a polyhydroxy additive selected from certain sugars, reduced sugars and/or polyhydroxy urethanes formed from these sugars or reduced sugars and an organic diisocyanate.
Inventors
- 👤 Charles W. Goodrich
- 👤 William L. Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:26
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/58; D01F6/70; C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08K5/00; C08K5/04; C08K5/15; C08K5/151; C08K5/16; C08K5/205; C08L; C08L75/00; C08L75/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
129 words
An improved fiber of a polyether-based spandex polymer composition which contains a zinc oxide additive in a concentration of 0.5 to 10%, the improvement comprising a polyhydroxy additive in a concentration in the range of 0.5 to 5%, the percentages being based on weight of the polymer, the polyhydroxy additive being selected from the group consisting of sugars having the chemical formula C.sub.x (H.sub.2 O).sub.y (I) where x is 4, 5, 6, 12 or 18 and y is 4, 5, 6, 11 or 16, reduced sugars having the chemical formula C.sub.z H.sub.2(z+1) O.sub.z (II) where z is 4, 5 or 6, and low molecular weight polyhydroxy urethanes which are formed by the reaction of a large excess the sugars (I) or the reduced sugars (II) with an organic diisocyanate.
Claim 2
Dependent Claim
129 words
An improved fiber of a polyether-based spandex polymer composition which contains a zinc oxide additive in a concentration of 0.5 to 10%, the improvement comprising a polyhydroxy additive in a concentration in the range of 0.5 to 5%, the percentages being based on weight of the polymer, the polyhydroxy additive being selected from the group consisting of sugars having the chemical formula C.sub.x (H.sub.2 O).sub.y (I) where x is 4, 5, 6, 12 or 18 and y is 4, 5, 6, 11 or 16, reduced sugars having the chemical formula C.sub.z H.sub.2(z+1) O.sub.z (II) where z is 4, 5 or 6, and low molecular weight polyhydroxy urethanes which are formed by the reaction of a large excess the sugars (I) or the reduced sugars (II) with an organic diisocyanate.
Claim 3
Dependent Claim
37 words
A fiber in accordance with claim 1 wherein the concentration of the polyhydroxy additive is in the range of 1 to 3% and the concentration of the zinc oxide is in the range of 1 to 3%.
Claim 4
Dependent Claim
19 words
A fiber in accordance with claim 1 wherein the polyhydroxy additive is a sugar selected from fructose and glucose.
Claim 5
Dependent Claim
20 words
A fiber in accordance with claim 1 wherein the polyhydroxy additive is a reduced sugar selected from sorbitol and mannitol.
Claim 6
Dependent Claim
51 words
A fiber in accordance with claim 1 wherein the polyhydroxy additive has a number average molecular weight of no more than 1,000 and is the reaction product of a reduced sugar and a diisocyanate selected from the group consisting of hexamethylene diisocyanate, p,p'-methylene-diphenyl diisocyanate, 4,4'-methylene-bis(cyclohexyl) diisocyanate, isophorone diisocyanate and α,α,α',α'-tetramethylxylylene diisocyanate.
Claim 7
Dependent Claim
13 words
A fiber in accordance with claim 5 wherein the reduced sugar is sorbitol.
Claim 8
Dependent Claim
37 words
A fiber in accordance with any of claims 1 through 6 wherein the composition contains a hindered phenolic antioxidant in a concentration in the in the range of 0.2 to 5% based on weight of the polymer.
Claim 9
Dependent Claim
53 words
A fiber in accordance with any of claims 1 through 6 wherein the composition contains a hindered phenolic antioxidant in a concentration in the in the range of 0.5 to 2% and the antioxidant is selected from the group consisting of 1,3,5-tris(4-t-butyl-3-hydroxy-2,6-dimethylbenzyl)-1,3,5-triazine-2,4,6(1H,3H,5H)trione, 1,3,5-trimethyl-2,4,6-tris(3,5-di-t-butyl-4-hydroxybenzyl)benzene, 1,1-bis(2-methyl-4-hydroxy-5-t-butylphenyl)butane, and a condensation product of p-cresol, dicyclopentadiene and isobutene.
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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) | 1994-07-01 | 1994-12-31 | 1995-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-01 | 1998-12-31 | 1999-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-01 | 2002-12-31 | 2003-07-02 | $7700.00 | Window Closed / Lapsed |