US4140699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing perfluorinated vinyl ethers
Assignee: Hoechst AG
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Filing: 1976-11-22
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Granted: 1979-02-20
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Expires: 1996-11-22
Abstract
Abstract Perfluorinated vinyl ethers are prepared by reacting a fluorinated carboxylic acid fluoride with hexafluoropropylene epoxide in the presence of a catalyst and thereafter pyrolyzing the carboxylic acid fluoride containing ether linkages, optionally after having converted it into a salt of a monovalent metal.
Inventors
- 👤 Thomas Martini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:28
CPC Classifications
C; C07; C07D; C07D319/00; C07D319/10; C07D319/12; H; H01; H01B; H01B3/00; H01B3/18; H01B3/20; H01B3/24; C10; C10M; C10M2211/00; C10M2211/04; C10M2211/042; C10M2211/044; C10M2211/06; C10M2213/00; C10M2213/04; C10M2213/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
65 words
A process for preparing a perfluorinated vinyl ether of the general formula ##STR12## which comprises hydrolyzing an acid fluoride of the formula ##STR13## wherein n is 0 or 1, to form the corresponding perfluorinated carboxylic acid, thereafter neutralizing the acid and heating the resulting salt of the carboxylic acid to a temperature of 160° to 300° C. at a pressure of less than 10 torrs.
Claim 2
Dependent Claim
65 words
A process for preparing a perfluorinated vinyl ether of the general formula ##STR12## which comprises hydrolyzing an acid fluoride of the formula ##STR13## wherein n is 0 or 1, to form the corresponding perfluorinated carboxylic acid, thereafter neutralizing the acid and heating the resulting salt of the carboxylic acid to a temperature of 160° to 300° C. at a pressure of less than 10 torrs.
Claim 3
Dependent Claim
22 words
Process as claimed in claim 1, which comprises heating the carboxylic acid salt to a temperature of from 190 to 230° C.
Claim 4
Dependent Claim
19 words
Process as claimed in claim 1, which comprises performing the heating of the carboxylic acid salt under reduced pressure.
Claim 5
Dependent Claim
59 words
A process for preparing a perfluorinated vinyl ether of the general formula ##STR14## which comprises hydrolyzing an acid fluoride of the formula ##STR15## to form the corresponding perfluorinated carboxylic acid, thereafter neutralizing the acid and heating the resulting salt of the carboxylic acid to a temperature of 160° to 300° C. at a pressure of less tha 10 torrs.
Claim 6
Dependent Claim
59 words
A process for preparing a perfluorinated vinyl ether of the general formula ##STR14## which comprises hydrolyzing an acid fluoride of the formula ##STR15## to form the corresponding perfluorinated carboxylic acid, thereafter neutralizing the acid and heating the resulting salt of the carboxylic acid to a temperature of 160° to 300° C. at a pressure of less tha 10 torrs.
Claim 7
Dependent Claim
59 words
A process for preparing a perfluorinated vinyl ether of the general formula ##STR16## which comprises hydrolyzing an acid fluoride of the formula ##STR17## to form the corresponding perfluorinated carboxylic acid, thereafter neutralizing the acid and heating the resulting salt of the carboxylic acid to a temperature of 160° to 300° C. at a pressure of less than 10 torrs.
Claim 8
Dependent Claim
59 words
A process for preparing a perfluorinated vinyl ether of the general formula ##STR16## which comprises hydrolyzing an acid fluoride of the formula ##STR17## to form the corresponding perfluorinated carboxylic acid, thereafter neutralizing the acid and heating the resulting salt of the carboxylic acid to a temperature of 160° to 300° C. at a pressure of less than 10 torrs.
References Cited (Backward Citations)
DE1162829A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-02-19 | 1982-08-21 | 1983-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-19 | 1986-08-21 | 1987-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-19 | 1990-08-21 | 1991-02-20 | $7700.00 | Window Closed / Lapsed |