Patent US4528364A successfully refreshed from Google Patents.
US4528364A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of alkaline catalysts from polyether polyols and polyalkylene carbonate polyols
Assignee: Dow Chemical Co
•
Filing: 1984-04-19
•
Granted: 1985-07-09
•
Expires: 2004-04-19
Abstract
Abstract This invention is a method of removing alkaline catalysts from polyether polyols and polyalkylene carbonate polyols which comprises (a) dissolving a polyether polyol or a polyalkylene carbonate polyol in a polar aprotic solvent; (b) contacting the polyether polyol or polyalkylene carbonate polyol solution with a sufficient amount of an adsorbent which adsorbs alkaline catalysts to adsorb the alkaline catalysts, at a temperature of between about -30° C. and 110° C. under conditions such that the adsorbent adsorbs the alkaline catalysts; and (c) physically separating the adsorbent from the polyol solution.
Inventors
- 👤 Donald G. Prier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:02
CPC Classifications
C; C07; C07C; C07C68/00; C07C68/08; C08; C08G; C08G64/00; C08G64/20; C08G64/30; C08G64/40
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
87 words
A method of removing alkaline catalysts from polyether polyols and polyalkylene carbonate polyols which comprises (a) dissolving a polyether polyol or a polyalkylene carbonate polyol in a polar aprotic solvent; (b) contacting the polyether polyol or polyalkylene carbonate polyol solution with a sufficient amount of an adsorbent which adsorbs alkaline catalysts to adsorb the alkaline catalysts, at a temperature of between about -30° C. and 110° C. under conditions such that the adsorbent adsorbs the alkaline catalysts; and (c) physically separating the adsorbent from the polyol solution.
Claim 2
Independent Claim
87 words
A method of removing alkaline catalysts from polyether polyols and polyalkylene carbonate polyols which comprises (a) dissolving a polyether polyol or a polyalkylene carbonate polyol in a polar aprotic solvent; (b) contacting the polyether polyol or polyalkylene carbonate polyol solution with a sufficient amount of an adsorbent which adsorbs alkaline catalysts to adsorb the alkaline catalysts, at a temperature of between about -30° C. and 110° C. under conditions such that the adsorbent adsorbs the alkaline catalysts; and (c) physically separating the adsorbent from the polyol solution.
Claim 3
Dependent Claim
16 words
The process of claim 1 wherein the adsorbent is an aluminum or alkaline earth metal silicate.
Claim 4
Dependent Claim
12 words
The process of claim 2 wherein the adsorbent is a magnesium silicate.
Claim 5
Dependent Claim
13 words
The process of claim 3 wherein the polyol is a polyalkylene carbonate polyol.
Claim 6
Dependent Claim
21 words
The process of claim 4 wherein the solvent is a ketone, an ether, a cyclic ether, an aldehyde or an amide.
Claim 7
Dependent Claim
11 words
The process of claim 5 wherein the solvent is a ketone.
Claim 8
Dependent Claim
17 words
The process of claim 6 wherein the contacting temperature is between about 0° C. and 40° C.
Claim 9
Dependent Claim
17 words
The process of claim 7 wherein the contacting temperature is between about 10° C. and 30° C.
Claim 10
Dependent Claim
24 words
The process of claim 8 wherein the polyol is contacted with between about 0.01 and 25 percent by weight of the polyol, of adsorbent.
Claim 11
Independent Claim
124 words
A method of removing alkaline catalysts from polyether polyols and polyalkylene carbonate polyols which comprises (a) dissolving between about 5 and 95 percent by weight of a polyether polyol or a polyalkylene carbonate polyol in a polar aprotic solvent; (b) allowing the solution to stand for a period sufficient for a portion of the alkaline catalyst to precipitate; (c) contacting the polyether polyol or polyalkylene carbonate polyol solution with between about 0.01 and 25.0 weight percent, based on the polyether polyol or polyalkylene carbonate polyol, of an adsorbent which adsorbs alkaline catalysts, at a temperature of between about -30° C. and 110° C. under conditions such that the adsorbent adsorbs the remaining alkaline catalysts; and (d) physically separating the adsorbent from the polyol solution.
Claim 12
Independent Claim
124 words
A method of removing alkaline catalysts from polyether polyols and polyalkylene carbonate polyols which comprises (a) dissolving between about 5 and 95 percent by weight of a polyether polyol or a polyalkylene carbonate polyol in a polar aprotic solvent; (b) allowing the solution to stand for a period sufficient for a portion of the alkaline catalyst to precipitate; (c) contacting the polyether polyol or polyalkylene carbonate polyol solution with between about 0.01 and 25.0 weight percent, based on the polyether polyol or polyalkylene carbonate polyol, of an adsorbent which adsorbs alkaline catalysts, at a temperature of between about -30° C. and 110° C. under conditions such that the adsorbent adsorbs the remaining alkaline catalysts; and (d) physically separating the adsorbent from the polyol solution.
Claim 13
Independent Claim
74 words
A method of removing alkaline catalyst from polyether polyols and polyalkylene carbonate polyols which comprises (a) dissolving between about 5 and 95 percent by weight of a polyether polyol or a polyalkylene carbonate polyol, with a molecular weight of greater than about 1000, in a ketone solvent; (b) allowing the solution to stand for a period sufficient for the alkaline catalyst to precipitate; and (c) physically separating the alkaline catalysts from the polyol solution.
Claim 14
Independent Claim
74 words
A method of removing alkaline catalyst from polyether polyols and polyalkylene carbonate polyols which comprises (a) dissolving between about 5 and 95 percent by weight of a polyether polyol or a polyalkylene carbonate polyol, with a molecular weight of greater than about 1000, in a ketone solvent; (b) allowing the solution to stand for a period sufficient for the alkaline catalyst to precipitate; and (c) physically separating the alkaline catalysts from the polyol solution.
References Cited (Backward Citations)
US3028433A
Cited
US3374275A
Cited
US3528920A
Cited
US3689462A
Cited
US3951888A
Cited
US4111865A
Cited
US4029879A
Cited
US4137396A
Cited
US4110268A
Cited
US4129718A
Cited
US4137398A
Cited
US4287078A
Cited
US4482750A
Cited
US4355188A
Cited
US4306943A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-08 | 1989-01-07 | 1989-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-08 | 1993-01-07 | 1993-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-08 | 1997-01-07 | 1997-07-09 | $7700.00 | Window Closed / Lapsed |