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US4686137A
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US
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Moisture vapor permeable materials
Assignee: Evonik Goldschmidt GmbH
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Filing: 1984-05-21
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Granted: 1987-08-11
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Expires: 2004-05-21
Abstract
Abstract Polymeric materials are provided characterized by hard segments and copolymer soft blocks comprising hydrophobic and hydrophilic components. The polymeric materials may be mixed with a base polymer and/or inorganic salts. The polymeric materials and mixtures containing same are characterized by improved moisture vapor transmission rates. The polymeric materials may be formed into films for use as wound dressings, burn dressings, surgical drapes, semipermeable membranes, and coatings for textiles.
Inventors
- 👤 Robert S. Ward, Jr.
- 👤 Judy S. Riffle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:06
CPC Classifications
C; C08; C08L; C08L83/00; C08L83/10; C08L83/12; A; A61; A61L; A61L33/00; A61L33/06; A61L33/062; A61L33/068; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/12; C08G18/28; C08G18/40; C08G18/48; C08G18/4804; C08G18/4808; C08G18/61; C08G77/00; C08G77/42; C08G77/452; C08G77/455; C08G77/458; C08G77/46; C08L75/00; C08L75/04; D; D06; D06N; D06N3/00; D06N3/04; D06N3/047; D06N2209/00; D06N2209/14; D06N2209/141; D06N2209/142; D06N2211/00; D06N2211/12; D06N2211/18; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T442/00; Y10T442/20; Y10T442/2139
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
74 words
A coated textile impermeable to liquid water characterized by high moixture vapor transmission comprising a fabric web and a uniform nonporous coating on at least one surface of said web, said coating comprising a segmented block multipolymer comprising an essentially linear segmented copolymer chain characterized by at least one polyurethane or polyurethane urea hard segment and a soft block copolymer comprising at least one hydrophilic soft block and at least one hydrophobic soft block.
Claim 2
Dependent Claim
74 words
A coated textile impermeable to liquid water characterized by high moixture vapor transmission comprising a fabric web and a uniform nonporous coating on at least one surface of said web, said coating comprising a segmented block multipolymer comprising an essentially linear segmented copolymer chain characterized by at least one polyurethane or polyurethane urea hard segment and a soft block copolymer comprising at least one hydrophilic soft block and at least one hydrophobic soft block.
Claim 3
Dependent Claim
33 words
A textile according to claim 1 wherein said hard segment is a homopolymer selected from the group consisting of condensation products of diphenylmethane diisocyanate with a diamine and diphenylmethane diisocyanate with a diol.
Claim 4
Dependent Claim
22 words
A textile according to claim 2 wherein said hydrophilic soft block comprises polyethylene oxide and said hydrophobic soft block comprises polytetraalkylene oxide.
Claim 5
Dependent Claim
18 words
A textile according to claim 3 wherein said soft block copolymer further comprises a polydialkylsiloxane hydrophobic soft block.
Claim 6
Dependent Claim
31 words
A textile according to claim 3 wherein said coating comprises: ______________________________________
15-50% by weight of said hard segment
20-45% polyethylene oxide (1000-3000 mol. wt
(number average))
25-65% polytetramethylene oxide
100%
______________________________________
Claim 7
Dependent Claim
17 words
A textile according to claim 5 wherein said coating further comprises up to 2% by weight polydimethylsiloxane.
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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) | 1990-08-10 | 1991-02-09 | 1991-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-10 | 1995-02-09 | 1995-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-10 | 1999-02-09 | 1999-08-11 | $7700.00 | Window Closed / Lapsed |