Patent US4220732A successfully refreshed from Google Patents.
US4220732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microcellular polyurethane foams
Assignee: BASF Corp
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Filing: 1978-12-22
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Granted: 1980-09-02
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Expires: 1998-12-22
Abstract
Abstract A method of improving the load-bearing properties of microcellular flexible, urethane foams wherein the processing characteristics for the production thereof are also improved, which comprises utilizing a combination of 1,4-butanediol and phenyldiethanolamine as a chain extender.
Inventors
- 👤 Robert L. McBrayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:30
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/6681; C08G18/6688; C08G2110/00; C08G2110/0008; C08G2110/0041; C08G2110/0066
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
79 words
Polyurethane foam made from the reaction products of at least one polyoxyalkylene ether polyol having a hydroxyl functionality of at least two with at least one organic polyisocyanate in the presence of a blowing agent with about 0.2 to about 40 percent by weight based on the polyol of a chain extender comprising from about 1 percent to about 80 percent by weight of phenyldiethanolamine and from about 20 percent to about 99 percent by weight of 1,4-butane diol.
Claim 2
Dependent Claim
79 words
Polyurethane foam made from the reaction products of at least one polyoxyalkylene ether polyol having a hydroxyl functionality of at least two with at least one organic polyisocyanate in the presence of a blowing agent with about 0.2 to about 40 percent by weight based on the polyol of a chain extender comprising from about 1 percent to about 80 percent by weight of phenyldiethanolamine and from about 20 percent to about 99 percent by weight of 1,4-butane diol.
Claim 3
Dependent Claim
39 words
A polyurethane foam as defined in claim 1, wherein the chain extender comprises from about 10 percent to about 65 percent by weight of phenyldiethanolamine and from about 35 percent to about 90 percent by weight of 1,4-butane diol.
Claim 4
Dependent Claim
14 words
A polyurethane foam as defined in claim 1, wherein the blowing agent is water.
Claim 5
Dependent Claim
18 words
A polyurethane foam as defined in claim 1, wherein a major portion of the polyisocyanate is diphenylmethane diisocyanate.
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) | 1983-09-02 | 1984-03-03 | 1984-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-02 | 1988-03-03 | 1988-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-02 | 1992-03-03 | 1992-09-02 | $7700.00 | Window Closed / Lapsed |