US3694499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing perfluoro 3-phenoxypropionic acid
Assignee: EIDP Inc
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Filing: 1970-03-18
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Granted: 1972-09-26
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Expires: 1990-03-18
Abstract
Abstract Novel compounds of the formula ARE PROVIDED WHEREIN X is -COF, -COCl, -COOH, -COOR, -COOM, CONR1R2, or -CN wherein R is an alkyl radical, M is a metal, and R1 and R2 are independently hydrogen or alkyl radicals. Also provided are novel compounds of the formula C6F5OCF2CF2CF2OCF(CF3)- X wherein X is as defined above. These novel compounds are useful in the preparation of perfluoro(3phenoxypropyl vinyl ether) monomer, said monomer being useful in the preparation of copolymers having improved oxidative stability.
Inventors
- 👤 Richard W Quarles Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:52
CPC Classifications
C; C07; C07C; C07C59/00; C07C59/40; C07C59/58; C07C59/64; C07C59/66; C07C59/68; C07C51/00; C07C51/15; C07C51/347; C07C51/367; C07C51/58; C07C51/60
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
29 words
The process of claim 1 wherein about 1 mole of a metal salt of pentafluorophenol, about 2 moles of tetrafluoroethylene, and about 4 moles of carbon dioxide are employed.
Claim 2
Dependent Claim
11 words
The process of claim 1 wherein the temperature is about 75*-150*C.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein the heating is conducted for about 2-12 hours.
Claim 4
Dependent Claim
14 words
The process of claim 1 wherein the metal salt is an alkali metal salt.
Claim 5
Dependent Claim
16 words
The process of claim 1 wherein the metal salt is a Cs, K, or Na salt.
References Cited (Backward Citations)
US2799712A
Cited
US2917548A
Cited
US3192190A
Cited
US3311657A
Cited
US3419610A
Cited
US3467638A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |