US4452997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of polyester polyols and/or polyester-polyether polyols
Assignee: BASF SE
•
Filing: 1982-12-23
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Granted: 1984-06-05
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Expires: 2002-12-23
Abstract
Abstract Polyester polyols and/or polyester-polyether polyols are prepared by reacting polyols preferably di- to hexafunctional polyether polyols with hydroxyl numbers of 30 to 200 with at least one carboxylic anhydride, preferably glutaric anhydride, resulting in a carboxylic acid half ester which is subsequently oxyalkylated with at least one alkylene oxide, preferably ethylene oxide in the presence of at least 1 thiodialkylene glycol, preferably thiodiethylene and/or thiodipropylene glycol.
Inventors
- 👤 Matthias Marx
- 👤 Wolfgang Straehle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:02
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/66; C08G63/68; C08G63/688; C08G65/00; C08G65/02; C08G65/26; C08G65/2636
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
47 words
A process for the preparation of polyester-and/or polyester-polyether polyols by reaction of a polyol with a carboxylic acid anhydride forming carboxylic acid half esters and subsequently oxyalkylating the carboxylic half esters with alkylene oxides in the presence of a catalytic amount of at least one thiodialkylene glycol.
Claim 2
Dependent Claim
47 words
A process for the preparation of polyester-and/or polyester-polyether polyols by reaction of a polyol with a carboxylic acid anhydride forming carboxylic acid half esters and subsequently oxyalkylating the carboxylic half esters with alkylene oxides in the presence of a catalytic amount of at least one thiodialkylene glycol.
Claim 3
Dependent Claim
17 words
The process of claim 1 wherein thiodiethylene glycol and/or thiodipropylene glycol are used as the thiodialkylene glycols.
Claim 4
Dependent Claim
24 words
The process of claim 1 wherein 0.002 to 0.05 mole of thiodialkylene glycol is used per carboxyl group of the carboxylic acid half ester.
Claim 5
Dependent Claim
23 words
The process of claim 1 wherein di- to hexafunctional polyether polyols with hydroxyl numbers of 30 to 200 are used as the polyols.
Claim 6
Dependent Claim
15 words
The process of claim 1 wherein glutaric anhydride is used as the carboxylic acid anhydride.
Claim 7
Dependent Claim
14 words
The process of claim 1 wherein ethylene oxide is used as the alkylene oxide.
Claim 8
Dependent Claim
22 words
The process of claim 1 wherein one mole of alkylene oxide is used per carboxyl group of the carboxylic acid half ester.
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) | 1987-06-05 | 1987-12-05 | 1988-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-05 | 1991-12-05 | 1992-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-05 | 1995-12-05 | 1996-06-05 | $7700.00 | Window Closed / Lapsed |