Patent US2269183A successfully refreshed from Google Patents.
Patent US4332936A successfully refreshed from Google Patents.
US4332936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making polyether polyols from solid hydroxyl containing initiators
Assignee: Bayer Corp
•
Filing: 1978-10-16
•
Granted: 1982-06-01
•
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 19:33
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)
US2902478A
Cited
US3222357A
Cited
US3357970A
Cited
US3317508A
Cited
US3433751A
Cited
US3346557A
Cited
US3941769A
Cited
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 |