US4332936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making polyether polyols from solid hydroxyl containing initiators
Assignee: Bayer Corp
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Filing: 1978-10-16
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Granted: 1982-06-01
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Expires: 1998-10-16
Abstract
Abstract This invention provides a novel method for making polyether polyols from solid initiator compounds containing from 4 to 8 hydroxyl groups. The method involves dissolving the solid initiator compound in a solvent such as dimethyl formamide prior to alkoxylation. The method is particularly useful in making high functional sucrose-based polyether polyols which can be readily processed at moderate temperatures and give low color products. These polyols are particularly suited for the production of rigid polyurethane foams.
Inventors
- 👤 Neil H. Nodelman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:10
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/26; C08G65/2642; C08G65/2669; C08G65/2672; C07; C07H; C07H15/00; C07H15/02; C07H15/04; C07H15/08; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4829; C08G65/2603; C08G65/2606; C08G2110/00; C08G2110/0025
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
In a process for making a polyether polyol wherein a solid initiator compound containing from 4 to 8 hydroxyl groups is reacted with an alkylene oxide in the presence of an amine catalyst or an amine functional coinitiator which functions as a catalyst, the improvement which comprises mixing and partially dissolving the solid initiator in from about 5 to about 70 parts by weight, based on 100 parts by weight of solid initiator of dimethylformamide.
Claim 2
Dependent Claim
75 words
In a process for making a polyether polyol wherein a solid initiator compound containing from 4 to 8 hydroxyl groups is reacted with an alkylene oxide in the presence of an amine catalyst or an amine functional coinitiator which functions as a catalyst, the improvement which comprises mixing and partially dissolving the solid initiator in from about 5 to about 70 parts by weight, based on 100 parts by weight of solid initiator of dimethylformamide.
References Cited (Backward Citations)
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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) | 1985-05-31 | 1985-11-30 | 1986-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-31 | 1989-11-30 | 1990-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-31 | 1993-11-30 | 1994-06-01 | $7700.00 | Window Closed / Lapsed |