US4486351A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Use of polymeric ethylene oxides in the preparation of glycidyl azide polymer
Assignee: Hercules LLC
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Filing: 1983-12-14
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Granted: 1984-12-04
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Expires: 2003-12-14
Abstract
Abstract An improved process of preparing hydroxy-terminated aliphatic polyethers having pendant alkyl azide groups is disclosed. The process entails reacting metal azide and hydroxy-terminated aliphatic polyether having pendant haloalkyl groups at elevated temperatures. The improvement comprises using a liquid reaction medium that is relatively non-polar and comprises a polyalkyleneoxide having (a) a molecular weight above about 200 and (b) miscibility with the hydroxy-terminated aliphatic polyether having pendant haloalkyl groups at temperatures greater than about 80° C.
Inventors
- 👤 Robert A. Earl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:40
CPC Classifications
C; C07; C07C; C07C247/00; C08; C08G; C08G65/00; C08G65/02; C08G65/32; C08G65/321; C08G65/325
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
128 words
A process of preparing glycidyl azide polyether of improved purity, said process comprising: a. forming a liquid reaction mixture consisting essentially of (i) polyethyleneoxide having a molecular weight between about 300 and 1000, (ii) sodium azide and (iii) polyepichlorohydrin having a molecular weight between about 500 and 10,000 wherein (i) and (iii) are miscible in each other at temperatures greater than about 80° C.; b. forming said glycidyl azide polyether in a reacted mixture by heating said reaction mixture at a temperature between about 80° and 120° C. for a time sufficient for displacement of the chloro groups of said polyepichlorohydrin with azido groups; c. removing said polyethyleneoxide from said reacted mixture by aqueous washings; and d. isolating said glycidyl azide polymer from the washed product of c.
Claim 2
Dependent Claim
128 words
A process of preparing glycidyl azide polyether of improved purity, said process comprising: a. forming a liquid reaction mixture consisting essentially of (i) polyethyleneoxide having a molecular weight between about 300 and 1000, (ii) sodium azide and (iii) polyepichlorohydrin having a molecular weight between about 500 and 10,000 wherein (i) and (iii) are miscible in each other at temperatures greater than about 80° C.; b. forming said glycidyl azide polyether in a reacted mixture by heating said reaction mixture at a temperature between about 80° and 120° C. for a time sufficient for displacement of the chloro groups of said polyepichlorohydrin with azido groups; c. removing said polyethyleneoxide from said reacted mixture by aqueous washings; and d. isolating said glycidyl azide polymer from the washed product of c.
Claim 3
Dependent Claim
23 words
The process in accordance with claim 1, wherein said reacted mixture is diluted with a water immescible liquid prior to said aqueous washings.
Claim 4
Dependent Claim
17 words
The process in accordance with claim 1 wherein said polyethyleneoxide has a molecular weight below about 1000.
Claim 5
Dependent Claim
21 words
The process in accordance with claim 2, wherein the weight ratio between (i) and (iii) is between about 10:1 and 0.5:1.
Claim 6
Dependent Claim
21 words
The process in accordance with claim 4, wherein the molar ratio between (ii) and (iii) is between about 1.05:1 and 1.5:1.
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) | 1987-12-04 | 1988-06-04 | 1988-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-04 | 1992-06-04 | 1992-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-04 | 1996-06-04 | 1996-12-04 | $7700.00 | Window Closed / Lapsed |