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Patent US4137265A successfully refreshed from Google Patents.
US4137265A
Expired / Lapsed
US
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Water-insoluble nitrogen-containing polyols
Assignee: Dow Chemical Co
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Filing: 1976-01-28
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Granted: 1979-01-30
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Expires: 1996-01-28
Abstract
Abstract A group of water-insoluble nitrogen-containing polyols is provided which are capable of self-catalyzed reaction with organic polyisocyanates to form rigid polyurethane foams of excellent dimensional strength. The polyols of this group are prepared by reacting from 2 to 3 mols of propylene oxide with one mol of the Mannich reaction product of a mol of phenol or nonylphenol with one or two mols of diethanolamine.
Inventors
- 👤 Gayle D. Edwards
- 👤 Doris M. Rice
- 👤 Robert L. Soulen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:04
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/50; C08G18/5021; C08G18/5033; C08G18/30; C08G18/32; C08G18/3271; C08G18/329; C08G18/54; C08G18/546
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
23 words
A water-insoluble polyol having the property of self-catalyzing reaction with organic polyisocyanates to form rigid polyurethane foam said polyol having the formula ##STR4##
Claim 2
Dependent Claim
23 words
A water-insoluble polyol having the property of self-catalyzing reaction with organic polyisocyanates to form rigid polyurethane foam said polyol having the formula ##STR4##
References Cited (Backward Citations)
US2998452A
Cited
US3297597A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-29 | 1982-07-31 | 1983-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-29 | 1986-07-31 | 1987-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-29 | 1990-07-31 | 1991-01-30 | $7700.00 | Window Closed / Lapsed |