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US4200711A
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Process for preparing fluorine-containing polymers having carboxyl groups
Assignee: Tokuyama Corp
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Filing: 1978-04-21
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Granted: 1980-04-29
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Expires: 1998-04-21
Abstract
Abstract A process for preparing a fluorine-containing polymer having carboxyl groups, which comprises subjecting a fluorine-containing polymer having sulfonyl halide groups bonded to it to an oxidation reaction at a temperature of not more than 250 DEG C.; and a process for electrolysis, using as a diaphragm a member of the polymer obtained by the above process.
Inventors
- 👤 Yasuharu Onoue
- 👤 Toshikatsu Sata
- 👤 Akihiko Nakahara
- 👤 Junichi Itoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:54
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/30; B01D71/32; B01D67/00; B01D67/0002; B01D67/0006; C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2206; C08J5/2218; C08J5/2231; C08J5/2237; C08J2327/00; C08J2327/02; C08J2327/12; C08J2327/18
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
39 words
A process for preparing a fluorine-containing polymer having carboxyl groups, which comprises subjecting a fluorine-containing polymer having sulfonyl halide groups bonded to it to an oxidation reaction in the liquid phase at a temperature of 30° to 250° C.
Claim 2
Dependent Claim
39 words
A process for preparing a fluorine-containing polymer having carboxyl groups, which comprises subjecting a fluorine-containing polymer having sulfonyl halide groups bonded to it to an oxidation reaction in the liquid phase at a temperature of 30° to 250° C.
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein the fluorine-containing polymer is a perfluorocarbon polymer.
Claim 4
Dependent Claim
18 words
The process of claim 2 wherein the perfluorocarbon polymer is a copolymer of tetrafluoroethylene and perfluoro(3,6-dioxa-4-methyl-7-octene sulfonyl halide).
Claim 5
Dependent Claim
17 words
The process of claim 1 wherein the sulfonyl halide groups are sulfonyl chloride or sulfonyl bromide groups.
Claim 6
Dependent Claim
16 words
The process of claim 1 wherein the fluorine-containing polymer is in the form of a membrane.
Claim 7
Dependent Claim
18 words
The process of claim 1 wherein the oxidation reaction is carried out in the presence of a solvent.
Claim 8
Dependent Claim
18 words
The process of claim 6 wherein the solvent is an organic solvent consisting of carbon, hydrogen and oxygen.
Claim 9
Dependent Claim
21 words
The process of claim 7 wherein the organic solvent is an aliphatic saturated monohydric alcohol containing 2 to 6 carbon atoms.
Claim 10
Dependent Claim
27 words
The process of claim 1 wherein the oxidation reaction is carried out using an aqueous solution of hydrogen peroxide or an oxygen-containing gas as an oxidizing agent.
Claim 11
Dependent Claim
74 words
The process of claim 1 wherein the fluorine-containing polymer having sulfonyl halide groups is a homopolymer of a fluorine-containing vinyl monomer having a sulfonyl halide group bonded thereto or a copolymer of the vinyl monomer with a monomer copolymerizable therewith or a homopolymer of a fluorine-containing vinyl monomer having a functional group readily convertible to a sulfonyl halide group or a copolymer of the functional group containing vinyl monomer with a monomer copolymerizable therewith.
Claim 12
Dependent Claim
48 words
The process of claim 1 wherein the fluorine-containing polymer is a fluorocarbon monomer having the groups --Y--SO 2 X bonded thereto wherein Y is --C n F m H l --, in which n, m and l are 0 or positive integers and X is a halogen atom.
Claim 13
Dependent Claim
64 words
The process of claim 1 wherein the fluorine-containing polymer having sulfonyl halide groups is a polymer of a fluorine-containing vinyl monomer selected from the group consisting of: ##STR2## wherein Y is --C n F m H l --, in which n, m and l are 0 or positive integers and X is a halogen atom and p and q are 0 or positive integers.
Claim 14
Dependent Claim
23 words
The process of claim 12 in which Y is --(CF 2 ) r -- in which r is 0 or a positive integer.
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) | 1983-04-29 | 1983-10-29 | 1984-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-29 | 1987-10-29 | 1988-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-29 | 1991-10-29 | 1992-04-29 | $7700.00 | Window Closed / Lapsed |