Patent US4772677A successfully refreshed from Google Patents.
US4772677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Highly stretchable elasthane fibres with improved properties
Assignee: Bayer AG
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Filing: 1987-11-23
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Granted: 1988-09-20
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Expires: 2007-11-23
Abstract
Abstract This invention relates to highly stretchable elasthane fibres (Spandex fibres) based on segmented polyurethane(urea)s with improved elastic properties and high resistance to microbial degradation, characterized in that the polyurethane(urea)s used for the synthesis of the elasthanes are prepared from mixtures of relatively high molecular weight copolyester diols in the molecular weight range of from 2,500 to 4,000 and relatively high molecular polytetrahydrofurandiols in the molecular weight range of from 1,500 to 3,000.
Inventors
- 👤 Michael Kausch
- 👤 Carlhans Suling
- 👤 Hans Schroer
- 👤 Karlheinz Wolf
- 👤 Rudi Dauscher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:50
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/58; D01F6/70; C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/4009; C08G18/4018; C08G18/08; C08G18/0838; C08G18/0842; C08G18/0847; C08G18/0852; C08G18/10; C08G18/12
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
76 words
An elasthane fibre or thread which comprises a segmented polyurethane-(urea) containing soft segments of mixtures of polyesterdiols and polyoxytetramethyoenediols in a ratio, by weight, of from 85:15 to 50:50, the polyester diol comprising a copolyester of adipic acid and a mixture of from 2 to 4 different diols having at least 4 carbon atoms and having a molecular weight of from 2500 to 4000, and the polyoxytetramethylenediol having a molecular weight of from 1,500 to 3,000.
Claim 2
Dependent Claim
76 words
An elasthane fibre or thread which comprises a segmented polyurethane-(urea) containing soft segments of mixtures of polyesterdiols and polyoxytetramethyoenediols in a ratio, by weight, of from 85:15 to 50:50, the polyester diol comprising a copolyester of adipic acid and a mixture of from 2 to 4 different diols having at least 4 carbon atoms and having a molecular weight of from 2500 to 4000, and the polyoxytetramethylenediol having a molecular weight of from 1,500 to 3,000.
Claim 3
Dependent Claim
20 words
A fibre or thread as claimed in claim 1 wherein the weight ratio of polyesterdiol:polyoxytetramethylenediol is from 75:25 to 60:40.
Claim 4
Dependent Claim
21 words
A fibre or thread as claimed in claim 1 wherein the molecular weight of the polyesterdiol is from 2,700 to 3,500.
Claim 5
Dependent Claim
21 words
A fibre or thread as claimed in claim 1 wherein the molecular weight of the polyoxytetramethylenediol is from 1,700 to 2,500.
Claim 6
Dependent Claim
21 words
A process for the production of a fibre or thread as claimed in claim 1 which comprises spinning the segmented polyurethane.
Claim 7
Dependent Claim
60 words
A process as claimed in claim 5 wherein the said mixture of the said polyesterdiol and the said polyoxytetramethylenediol is reacted with a diisocyanate to form an isocyanate prepolymer, and the prepolymer is reacted in a solvent with a diamine to be converted into a highly viscous, spinnable solution which is then spun by the dry or wet spinning process.
Claim 8
Dependent Claim
33 words
A process as claimed in claim 5 wherein the said polyester diol and the said polyoxtetramethylene diol are reacted separately to convert them into isocyanate prepolymers, and the prepolymers are then mixed together.
Claim 9
Dependent Claim
21 words
A fibre or thread as claimed in claim 2 wherein the molecular weight of the polyesterdiol is from 2,700 to 3,500.
Claim 10
Dependent Claim
21 words
A fiber or thread as claimed in claim 8 wherein the molecular weight of the polyoxytetramethylenediol is from 1,700 to 2,500.
Claim 11
Dependent Claim
21 words
A fiber or thread as claimed in claim 2 wherein the molecular weight of the polyoxytetramethylenediol is form 1,700 to 2,500.
Claim 12
Dependent Claim
21 words
A fiber or thread as claimed in claim 3 wherein the molecular weight of the polyoxytetramethylenediol is from 1,700 to 2,500.
Claim 13
Dependent Claim
31 words
A process as claimed in claim 6 wherein the said polyesterdiol and the said polyoxytetramethylenediol are reacted separately to convert them into isocyanate prepolymers, and the prepolymers and then mixed together.
References Cited (Backward Citations)
US4481127A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-20 | 1992-03-21 | 1992-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-20 | 1996-03-21 | 1996-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-20 | 2000-03-21 | 2000-09-20 | $7700.00 | Window Closed / Lapsed |