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US4294943A
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Process for preparing fluorine-containing polymers having carboxyl groups
Assignee: Tokuyama Corp
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Filing: 1979-11-28
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Granted: 1981-10-13
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Expires: 1999-11-28
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
2026-11-07 22:02
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: 15
Claim 1
Independent Claim
61 words
A process for preparing a fluorine-containing polymer having carboxyl groups, which comprises subjecting a solid fluorine-containing polymer having sulfonyl halide groups bonded thereto as pendant groups to an oxidation reaction at a temperature of 50° to 250° C. in the presence of a vapor of an organic compound at least having a carbon-hydrogen bond and an oxidizing agent in vapor form.
Claim 2
Dependent Claim
61 words
A process for preparing a fluorine-containing polymer having carboxyl groups, which comprises subjecting a solid fluorine-containing polymer having sulfonyl halide groups bonded thereto as pendant groups to an oxidation reaction at a temperature of 50° to 250° C. in the presence of a vapor of an organic compound at least having a carbon-hydrogen bond and an oxidizing agent in vapor form.
Claim 3
Dependent Claim
22 words
The process of claim 1 wherein the organic compound has a vapor pressure of at least 10 mmHg under the reaction conditions.
Claim 4
Dependent Claim
13 words
The process of claim 1 wherein the organic compound is an oxygen-containing compound.
Claim 5
Dependent Claim
21 words
The process of claim 3 wherein the oxygen-containing compound is an aliphatic saturated monohydric alcohol having 2 to 6 carbon atoms.
Claim 6
Dependent Claim
13 words
The process of claim 1 wherein the fluorine-containing polymer is a perfluorocarbon polymer.
Claim 7
Dependent Claim
18 words
The process of claim 5 wherein the perfluorocarbon polymer is a copolymer of tertrafluoroethylene and perfluoro(3,6-dioxa-4-methyl-7-octene sulfonyl halide).
Claim 8
Dependent Claim
17 words
The process of claim 1 wherein the sulfonyl halide groups are sulfonyl chloride or sulfonyl bromide groups.
Claim 9
Dependent Claim
16 words
The process of claim 1 wherein the fluorine-containing polymer is in the form of a membrane.
Claim 10
Dependent Claim
74 words
The process of claim 1 wherein the fluorine-containing polymer having sulfonyl halide group 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 11
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 O or positive integers and X is a halogen atom.
Claim 12
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 O or positive integers and X is a halogen atom and p and q are O or positive integers.
Claim 13
Dependent Claim
23 words
The process of claim 11 in which Y is --(CF 2 ) r -- is which r is O or a positive integer.
Claim 14
Dependent Claim
20 words
The process of claim 1 wherein the oxidizing agent is one which generates or contains atomic, molecular or radical oxygen.
Claim 15
Dependent Claim
33 words
The process of claim 13 wherein the oxidizing agent is selected from the group consisting of oxygen, ozone, hydrogen peroxide, nitric acid, mixture thereof with inert gases, and halogen gases containing water vapor.
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) | 1984-10-12 | 1985-04-13 | 1985-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-12 | 1989-04-13 | 1989-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-12 | 1993-04-13 | 1993-10-13 | $7700.00 | Window Closed / Lapsed |