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Patent US4847427A successfully refreshed from Google Patents.
US4847427A
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Process for preparing fluorocarbon polyethers
Assignee: EIDP Inc
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Filing: 1988-04-13
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Granted: 1989-07-11
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Expires: 2008-04-13
Abstract
Abstract An improvement in a process for neutralizing perfluorinated carboxylic acids to make fluorocarbon polyethers in which the acid is heated with fluorine in the presence of a metal fluoride.
Inventors
- 👤 Mario J. Nappa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:32
CPC Classifications
C; C07; C07C; C07C41/00; C07C41/01; C07C41/18; C07C41/22; C07C43/00; C07C43/02; C07C43/03; C07C43/04; C07C43/12; C07C43/126; C08; C08G; C08G65/00; C08G65/02; C08G65/04; C08G65/22; C08G65/223; C08G65/226
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
67 words
In a process for preparing fluorocarbon polyethers comprising the steps of: (a) polymerizing a perfluoroolefin epoxide to form an acid fluoride; (b) hydrolyzing the acid fluoride to form a perfluorinated carboxylic acid; and (c) neutralizing the acid by heating with fluorine to replace the carboxylic acid end group with a fluorine radical, the improvement comprising heating the acid with fluorine in the presence of a metal fluoride.
Claim 2
Dependent Claim
67 words
In a process for preparing fluorocarbon polyethers comprising the steps of: (a) polymerizing a perfluoroolefin epoxide to form an acid fluoride; (b) hydrolyzing the acid fluoride to form a perfluorinated carboxylic acid; and (c) neutralizing the acid by heating with fluorine to replace the carboxylic acid end group with a fluorine radical, the improvement comprising heating the acid with fluorine in the presence of a metal fluoride.
Claim 3
Dependent Claim
17 words
The process of claim 1 wherein the metal fluoride is selected from sodium fluoride and potassium fluoride.
Claim 4
Dependent Claim
24 words
The process of claim 1 or claim 2 wherein the acid is heated to a temperature in the range of 50° to 300° C.
Claim 5
Dependent Claim
18 words
The process of claim 3 wherein the acid is heated to a temperature of 100° to 150° C.
Claim 6
Dependent Claim
24 words
The process of claim 1 or claim 2 wherein the perfluorinated carboxylic acid has a molecular weight in the range of 500 to 1000.
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) | 1992-07-10 | 1993-01-09 | 1993-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-10 | 1997-01-09 | 1997-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-10 | 2001-01-09 | 2001-07-11 | $7700.00 | Window Closed / Lapsed |