Patent US5082792A successfully refreshed from Google Patents.
Patent US4187384A successfully refreshed from Google Patents.
US4187384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of mono- and poly-ethylene glycol dialkyl ethers
Assignee: BASF SE
•
Filing: 1979-01-10
•
Granted: 1980-02-05
•
Expires: 1999-01-10
Abstract
Abstract Mono- and poly-ethylene glycol dialkyl ethers I R.sup.1 --O--(--CH.sub.2 --CH.sub.2 --O--).sub.n --R.sup.2 where R 1 is C 1 -C 4 -alkyl, R 2 is C 3 -C 5 -alkyl and n is from 1 to 100, are prepared by reacting monoalkyl ethers II R.sup.1 --O--(--CH.sub.2 --CH.sub.2 --O--).sub.n --H with a C 3 -C 5 -olefin III in the presence of an acid ion exchanger at from 1 to 200 bar and from 40° to 150° C., the reaction being started at from 100° to 150° C. and the temperature then being lowered, in at least two approximately equal steps, to from 40° to 80° C., the temperature being dropped in each case to the next-lower level when the conversion per unit time no longer changes significantly.
Inventors
- 👤 Rolf Platz
- 👤 Werner Fuchs
- 👤 Wolfgang Vodrazka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:44
CPC Classifications
C; C07; C07C; C07C41/00; C07C41/01; C07C41/05; C07C41/06; C08; C08G; C08G65/00; C08G65/02; C08G65/32; C08G65/329; C08G65/337
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
145 words
A process for the preparation of mono- and polyethylene glycol dialkyl ethers of the general formula I R.sup.1 --O--(--CH.sub.2 --CH.sub.2 --O--).sub.n --R.sup.2 I where R 1 is alkyl of 1 to 4 carbon atoms, R 2 is alkyl of 3 to 5 carbon atoms and n is from 1 to 100, by reacting monoalkyl ethers II R.sup.1 --O--(--CH.sub.2 --CH.sub.2 --O).sub.n --H II with an olefin (III) which corresponds to the radical R 2 , in the presence of an acid ion exchanger at from 1 to 200 bar and from 40° to 150° C., wherein the reaction is started at from 100° to 150° C. and the temperature is then lowered, in at least two approximately equal steps, to from 40° to 80° C., the temperature being dropped in each case to the next-lower level when the conversion per unit time no longer changes significantly.
Claim 2
Dependent Claim
145 words
A process for the preparation of mono- and polyethylene glycol dialkyl ethers of the general formula I R.sup.1 --O--(--CH.sub.2 --CH.sub.2 --O--).sub.n --R.sup.2 I where R 1 is alkyl of 1 to 4 carbon atoms, R 2 is alkyl of 3 to 5 carbon atoms and n is from 1 to 100, by reacting monoalkyl ethers II R.sup.1 --O--(--CH.sub.2 --CH.sub.2 --O).sub.n --H II with an olefin (III) which corresponds to the radical R 2 , in the presence of an acid ion exchanger at from 1 to 200 bar and from 40° to 150° C., wherein the reaction is started at from 100° to 150° C. and the temperature is then lowered, in at least two approximately equal steps, to from 40° to 80° C., the temperature being dropped in each case to the next-lower level when the conversion per unit time no longer changes significantly.
References Cited (Backward Citations)
DE2544569A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-02-04 | 1983-08-06 | 1984-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-04 | 1987-08-06 | 1988-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-04 | 1991-08-06 | 1992-02-05 | $7700.00 | Window Closed / Lapsed |