US3928386A
Expired / Lapsed
US
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Process for preparing cyclic polyethers
Assignee: Individual
•
Filing: 1974-01-03
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Granted: 1975-12-23
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Expires: 1994-01-03
Abstract
Abstract The invention relates to a process for preparing cyclic polyethers by oligomerisation of ethylene oxide in the presence of a catalyst, wherein the oligomerisation is carried out in the presence of an acidic inorganic fluoride and in the absence of compounds which can provide potential terminal groups.
Inventors
- 👤 Johannes Dale
- 👤 Gerd Borgen
- 👤 Kari Daasvatn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:07
CPC Classifications
C; C07; C07D; C07D323/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
80 words
A PROCESS FOR PREPARING CYCLIC ETHERS OF THE FORMULA: CH2<(-CH2-O-(CH2-CH2-O)(N-1)-) IN WHICH N IS AN INTEGER OF FROM 3 TO 11, BY OLIGOMERIZATION OF ETHYLENE OXIDE, WHICH PROCESS CONSISTS OF CONDUCTING THE OLIGOMERIZATION IN THE PRESENCE OF A CATLYST SELECTED FROM THE GROUP CONSISTING OF BORON TRIFLUORIDE PHOSPHORUS PENTAFLUORIDE AND ANTIMONY PENTAFLUORIDE AND IN THE PRESENCE OF BENZENE AS AN INERT SOLVENT SAID OLIGOMERIZATION BEING PERFORMED WITH COOLING TO A TEMPERATURE OF 20*C OR LESS, AND RECOVERING SAID CYCLIC ETHERS.
Claim 2
Dependent Claim
80 words
A PROCESS FOR PREPARING CYCLIC ETHERS OF THE FORMULA: CH2<(-CH2-O-(CH2-CH2-O)(N-1)-) IN WHICH N IS AN INTEGER OF FROM 3 TO 11, BY OLIGOMERIZATION OF ETHYLENE OXIDE, WHICH PROCESS CONSISTS OF CONDUCTING THE OLIGOMERIZATION IN THE PRESENCE OF A CATLYST SELECTED FROM THE GROUP CONSISTING OF BORON TRIFLUORIDE PHOSPHORUS PENTAFLUORIDE AND ANTIMONY PENTAFLUORIDE AND IN THE PRESENCE OF BENZENE AS AN INERT SOLVENT SAID OLIGOMERIZATION BEING PERFORMED WITH COOLING TO A TEMPERATURE OF 20*C OR LESS, AND RECOVERING SAID CYCLIC ETHERS.
Claim 3
Dependent Claim
13 words
Process according to claim 1, characterized in that the catalyst is boron trifluoride.
Claim 4
Dependent Claim
13 words
Process according to claim 1, characterized in that the catalyst is phosphorus pentafluoride.
Claim 5
Dependent Claim
13 words
Process according to claim 1, characterized in that the catalyst is antimony pentafluoride.
Claim 6
Dependent Claim
89 words
A process for preparing cyclic ethers of the formula: (CH2 -CH2 - O)n in which n is an integer of from 3 to 11, by oligomerization of ethylene oxide, which process consists of conducting the oligomerization in the presence of a catalyst selected from the group consisting of boron trifluoride, phosphorous pentafluoride and antimony pentafluoride, with hydrogen fluoride as a co-catalyst and in the presence of benzene as an inert solvent, said oligomerization being performed with cooling to a temperature of 20*C or less, and recovering said cyclic ethers.
Claim 7
Dependent Claim
89 words
A process for preparing cyclic ethers of the formula: (CH2 -CH2 - O)n in which n is an integer of from 3 to 11, by oligomerization of ethylene oxide, which process consists of conducting the oligomerization in the presence of a catalyst selected from the group consisting of boron trifluoride, phosphorous pentafluoride and antimony pentafluoride, with hydrogen fluoride as a co-catalyst and in the presence of benzene as an inert solvent, said oligomerization being performed with cooling to a temperature of 20*C or less, and recovering said cyclic ethers.
Claim 8
Dependent Claim
12 words
A process according to claim 5 wherein the catalyst is boron trifluoride.
Claim 9
Dependent Claim
12 words
A process according to claim 5, wherein the catalyst is phosphorus pentafluoride.
Claim 10
Dependent Claim
12 words
A process according to claim 5, wherein the catalyst is antimony pentafluoride.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |