Patent US5143942A successfully refreshed from Google Patents.
US5143942A
Expired / Lapsed
US
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Polyurethanes
Assignee: Albemarle Corp
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Filing: 1991-10-28
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Granted: 1992-09-01
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Expires: 2011-10-28
Abstract
Abstract Novel polyurethane-urea foams having superior tear and tensile strengths, elongation and load-bearing are prepared by reacting an alkylthio-substituted aromatic diamine in a mixture of polyols with an aromatic diisocyanate or aromatic diisocyanate prepolymer or mixtures thereof, having free NCO content of 0.1-50% by weight. These foams have good dynamic properties that make them attractive as cushioning materials.
Inventors
- 👤 William R. Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:22
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/6681; C08G18/6688; C08G18/30; C08G18/38; C08G18/3855; C08G18/3863; C08G18/3865; C08G18/3868; C08G18/6552; C08G18/6558; C08G18/657; C08G18/6685; C08G2110/00; C08G2110/0008; C08G2110/0041; C08G2110/0083
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
A process which comprises (a) casting into a mold a reaction mixture at ambient temperature of an admixture of an alkylthio substituted aromatic diamine selected from the class consisting of 3,5-di(methylthio)-2,4-diaminotoluene, 3,5-di(methylthio)-2,6-diaminotoluene, 3 methylthio-2,6-diaminotoluene and 1,3,5-triethylthio-2,6 diaminotoluene and admixtures as the sole diamines used in the process, at least one polyol selected from the group consisting of polyalkylene ether polyol, polymer polyol or mixtures thereof, water, a cell stabilizer consisting of one glycol amine selected from the group consisting of monoethanol amine and diethanol amine, an organosilicone stabilizer and reaction promotors with an isocyanate terminated component having a free isocyanate content by weight of from about 0.1 to about 50%; and (b) curing the reaction mixture in the mold at temperatures of about 77-302° F. (25-150° C.) to form a polyurethane-urea foam and removing the polyurethane-urea foam from the mold.
Claim 2
Dependent Claim
140 words
A process which comprises (a) casting into a mold a reaction mixture at ambient temperature of an admixture of an alkylthio substituted aromatic diamine selected from the class consisting of 3,5-di(methylthio)-2,4-diaminotoluene, 3,5-di(methylthio)-2,6-diaminotoluene, 3 methylthio-2,6-diaminotoluene and 1,3,5-triethylthio-2,6 diaminotoluene and admixtures as the sole diamines used in the process, at least one polyol selected from the group consisting of polyalkylene ether polyol, polymer polyol or mixtures thereof, water, a cell stabilizer consisting of one glycol amine selected from the group consisting of monoethanol amine and diethanol amine, an organosilicone stabilizer and reaction promotors with an isocyanate terminated component having a free isocyanate content by weight of from about 0.1 to about 50%; and (b) curing the reaction mixture in the mold at temperatures of about 77-302° F. (25-150° C.) to form a polyurethane-urea foam and removing the polyurethane-urea foam from the mold.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-09-01 | 1996-03-02 | 1996-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-01 | 2000-03-02 | 2000-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-01 | 2004-03-02 | 2004-09-01 | $7700.00 | Window Closed / Lapsed |