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US4435592A
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Process for the preparation of polyether-ester polyols
Assignee: BASF Corp
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Filing: 1982-09-29
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Granted: 1984-03-06
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Expires: 2002-09-29
Abstract
Abstract Polyether-ester polyols are prepared by reacting a crude polyether polyol, tetrahydrophthalic anhydride and an alkylene oxide. These polyols may be used in preparing polyrethane products.
Inventors
- 👤 Curtis J. Reichel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:24
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/67; C08G18/6795; C08G18/68; C08G18/683; C08G18/686; C08G63/00; C08G63/66
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
59 words
A process for the preparation of a polyether-ester polyol comprising (a) reacting an alkaline catalyst, selected from the group consisting of hydroxides and alkoxides of sodium, potassium, lithium, rubidium and cesium, containing polyoxyalkylene polyether polyol with tetrahydrophthalic anhydride to form a half acid ester, (b) reacting the product of (a) with an alkylene oxide and (c) removing the catalyst.
Claim 2
Dependent Claim
59 words
A process for the preparation of a polyether-ester polyol comprising (a) reacting an alkaline catalyst, selected from the group consisting of hydroxides and alkoxides of sodium, potassium, lithium, rubidium and cesium, containing polyoxyalkylene polyether polyol with tetrahydrophthalic anhydride to form a half acid ester, (b) reacting the product of (a) with an alkylene oxide and (c) removing the catalyst.
Claim 3
Dependent Claim
25 words
The process of claim 1 wherein the concentration of the catalyst employed is from 0.17 to 0.5 weight percent based on the weight of polyol.
Claim 4
Dependent Claim
35 words
The process of claim 1 wherein the polyoxyalkylene polyether polyol is the reaction product of a polyhydric alcohol and an alkylene oxide selected from the group consisting of ethylene oxide, propylene oxide and butylene oxide.
Claim 5
Dependent Claim
12 words
The process of claim 1 wherein the alkylene oxide is ethylene oxide.
Claim 6
Dependent Claim
12 words
The process of claim 1 wherein the alkylene oxide is propylene oxide.
Claim 7
Dependent Claim
18 words
The process of claim 1 wherein the reaction temperature is from about 75° C. to about 175° C.
Claim 8
Dependent Claim
71 words
A process for the preparation of a polyether-ester polyol comprising (a) reacting an organic compound containing three hydroxyl groups and an equivalent weight of 30 to 100 with tetrahydrophthalic anhydride in the presence of an alkaline catalyst, selected from the group consisting of hydroxides and alkoxides of sodium, potassium, lithium, rubidium and cesium, (b) reacting the product of (a) with an alkylene oxide or mixtures thereof, and (c) removing said catalyst.
Claim 9
Dependent Claim
71 words
A process for the preparation of a polyether-ester polyol comprising (a) reacting an organic compound containing three hydroxyl groups and an equivalent weight of 30 to 100 with tetrahydrophthalic anhydride in the presence of an alkaline catalyst, selected from the group consisting of hydroxides and alkoxides of sodium, potassium, lithium, rubidium and cesium, (b) reacting the product of (a) with an alkylene oxide or mixtures thereof, and (c) removing said catalyst.
Claim 10
Dependent Claim
25 words
The process of claim 7 wherein the concentration of the catalyst employed is from 0.17 to 0.5 weight percent based on the weight of polyol.
Claim 11
Dependent Claim
21 words
The process of claim 7 wherein the organic compound is selected from the group consisting of glycerine, trimethylolpropane, trimethylolethane, and 1,2,6-trihydroxyhexane.
Claim 12
Dependent Claim
18 words
The process of claim 7 wherein the reaction temperature is from about 75° C. to about 175° C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-06 | 1987-09-05 | 1988-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-06 | 1991-09-05 | 1992-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-06 | 1995-09-05 | 1996-03-06 | $7700.00 | Window Closed / Lapsed |