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US4465791A
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Process for preparing polyol-catalyst mixtures useful in the preparation of rigid polyurethane cellular products
Assignee: Dow Chemical Co
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Filing: 1983-08-04
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Granted: 1984-08-14
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Expires: 2003-08-04
Abstract
Abstract Polyol-catalyst mixtures, useful in the preparation of rigid polyurethane cellular products, are prepared simultaneously by reacting a Mannich base compound, water, and an epoxide and subsequently removing the water from the reaction mixture. Also provided are new rigid polyurethane cellular products having a high content of isocyanurate linkages, superior heat distortion temperatures and improved insulating properties, which products are obtained by reacting a polyisocyanate with the aforementioned polyol-catalyst mixture.
Inventors
- 👤 Howard P. Klein
- 👤 George P. Speranza
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:41
CPC Classifications
B; B01; B01J; B01J31/00; B01J31/02; B01J31/0201; B01J31/0202; B01J31/0234; B01J31/0235; B01J31/0237; C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/18; C08G18/1825; C08G18/28; C08G18/40; C08G18/54; C08G18/546; C08G2110/00; C08G2110/0008; C08G2110/0016; C08G2110/0025; C08G2110/0041; C08G2110/005
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
60 words
A process for preparing cellular polyurethane products by reacting the polyol-catalyst mixture prepared by a process which comprises heating a Mannich base compound with water and an epoxide and subsequently removing the water from the reaction mixture, said Mannich based compound being the reaction product of a phenol, an alkanolamine and formaldehyde with a polyisocyanate and a volatile blowing agent.
Claim 2
Dependent Claim
60 words
A process for preparing cellular polyurethane products by reacting the polyol-catalyst mixture prepared by a process which comprises heating a Mannich base compound with water and an epoxide and subsequently removing the water from the reaction mixture, said Mannich based compound being the reaction product of a phenol, an alkanolamine and formaldehyde with a polyisocyanate and a volatile blowing agent.
Claim 3
Dependent Claim
19 words
A process as in claim 1 wherein the reaction mixture also contains a foam stabilizer, flame retardant and filler.
Claim 4
Dependent Claim
20 words
A process as in claim 1 wherein the polyisocyanate is an aromatic polyisocyanate having from 2 to 6 isocyanate groups.
Claim 5
Dependent Claim
18 words
A process as in claim 1 wherein the polyisocyanate equivalents to polyol equivalents vary from 1:1 to 8:1.
Claim 6
Dependent Claim
14 words
A process as in claim 1 wherein the polyisocyanate is a methylene-bridged polyphenyl polyisocyanate.
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) | 1987-08-14 | 1988-02-13 | 1988-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-14 | 1992-02-13 | 1992-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-14 | 1996-02-13 | 1996-08-14 | $7700.00 | Window Closed / Lapsed |