US4228310A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyol preparation
Assignee: Dow Chemical Co
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Filing: 1979-03-19
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Granted: 1980-10-14
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Expires: 1999-03-19
Abstract
Abstract Covers a method of preparing polyether polyols useful in making a polyisocyanurate polymer by oxyalkylating an alcohol by the catalytic addition of an alkylene oxide to said alcohol in presence of a catalyst selected from the group consisting of carbamate salts, aminophenols, hexahydro-s-triazines and tetrahydrooxadiazines.
Inventors
- 👤 George P. Speranza
- 👤 Robert L. Zimmerman
- 👤 Thomas H. Austin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:16
CPC Classifications
C; C07; C07C; C07C41/00; C07C41/01; C07C41/02; C07C41/03; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/18; C08G18/1825; C08G18/20; C08G18/2009; C08G65/00; C08G65/02; C08G65/26; C08G65/2642; C08G65/2669; C08G65/2672; Y; Y10; Y10S; Y10S521/00; Y10S521/902
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
55 words
A method of preparing a polyether polyol useful in making a polyisocyanurate polymer, which comprises the steps of oxyalkylating an alcohol having a functionality of two or three by the catalytic addition of an alkylene oxide to said alcohol in presence of an oxyalkylating catalyst selected from the group consisting of aminophenols, hexahydro-s-triazines and tetrahydrooxadiazines.
Claim 2
Independent Claim
55 words
A method of preparing a polyether polyol useful in making a polyisocyanurate polymer, which comprises the steps of oxyalkylating an alcohol having a functionality of two or three by the catalytic addition of an alkylene oxide to said alcohol in presence of an oxyalkylating catalyst selected from the group consisting of aminophenols, hexahydro-s-triazines and tetrahydrooxadiazines.
Claim 3
Dependent Claim
17 words
The method of claim 1 wherein said oxyalkylating is carried out at a temperature of 50-200° C.
Claim 4
Dependent Claim
11 words
The method of claim 1 wherein said oxyalkylating catalyst is 2,4,6-tris(dimethylaminomethyl)phenol.
Claim 5
Dependent Claim
12 words
The method of claim 1 wherein said oxyalkylating catalyst is 1,3,5-tris(N,N-dimethylaminopropyl) hexahydro-s-triazine.
Claim 6
Dependent Claim
12 words
The method of claim 1 wherein said oxyalkylating catalyst is 1-(2-hydroxyethyl)-3,5,-bis(N,N-dimethylaminopropyl) hexahydro-s-triazine.
Claim 7
Dependent Claim
12 words
The method of claim 1 wherein said oxyalkylating agent is ethylene oxide.
Claim 8
Dependent Claim
12 words
The method of claim 1 wherein said oxyalkylating agent is propylene oxide.
Claim 9
Dependent Claim
18 words
The method of claim 1 wherein said oxyalkylating agent is a mixture of propylene oxide and ethylene oxide.
Claim 10
Dependent Claim
28 words
The method of claim 1 wherein said catalyst is employed in an amount ranging from about 0.1% to about 2% based on the weight of the alcohol reactant.
Claim 11
Dependent Claim
11 words
The method of claim 9 wherein said catalyst amount is 0.3-1%.
References Cited (Backward Citations)
US3357970A
Cited
US3745133A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-10-14 | 1984-04-14 | 1984-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-14 | 1988-04-14 | 1988-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-14 | 1992-04-14 | 1992-10-14 | $7700.00 | Window Closed / Lapsed |