US4396727A
Expired / Lapsed
US
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Cation exchange membrane and process for producing the same
Assignee: Japan Atomic Energy Agency
•
Filing: 1981-11-09
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Granted: 1983-08-02
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Expires: 2001-11-09
Abstract
Abstract A uniform cation exchange membrane having a certain fluorovinyl sulfonic acid monomer grafted onto a certain high-molecular substrate film which exhibits small electrical resistance and great physical strength is herein disclosed.
Inventors
- 👤 Isao Ishigaki
- 👤 Jiro Okamoto
- 👤 Hiroyuki Harada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:47
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2206; C08J5/2218; C08J5/2231; C08J5/2243; C08J5/225; C08F; C08F255/00; C08F255/02; C08F259/00; C08F259/08; C08J2327/00; C08J2327/02; C08J2327/12
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
42 words
A cation exchange membrane having a fluorovinyl sulfonic acid monomer grafted onto a high-molecular substrate film having a monomer of the formula: ##STR4## (wherein X is hydrogen, fluorine or CH 3 , and Y is hydrogen or fluorine) as a monomer unit.
Claim 2
Dependent Claim
42 words
A cation exchange membrane having a fluorovinyl sulfonic acid monomer grafted onto a high-molecular substrate film having a monomer of the formula: ##STR4## (wherein X is hydrogen, fluorine or CH 3 , and Y is hydrogen or fluorine) as a monomer unit.
Claim 3
Dependent Claim
50 words
A cation exchange membrane according to claim 1 wherein the fluorovinyl sulfonic acid monomer has the formula: CF 2 ═CF--CF 2 ) n SO 2 Z (wherein n is 0 or 2, and Z is fluorine, hydroxyl group, NH 2 , ONH 4 or OM, M being an alkali metal).
Claim 4
Dependent Claim
37 words
A cation exchange membrane according to claim 1 wherein the fluorovinyl sulfonic acid monomer has the formula: R 1 --CF═CF-SO 2 Z (wherein R 1 is fluorine or a perfluoroalkyl group having 1 to 5 carbon atoms).
Claim 5
Dependent Claim
33 words
A cation exchange membrane according to claim 1 wherein the fluorovinyl sulfonic acid monomer has the formula: ##STR5## (wherein R 2 is fluorine or a perfluoroalkyl group having 1 to 5 carbon atoms).
Claim 6
Dependent Claim
50 words
A cation exchange membrane according to claim 1 wherein the fluorovinyl sulfonic acid monomer has the formula: ##STR6## (wherein R 3 is fluorine or CH 3 ; R 4 is fluorine or a perfluoroalkyl group having 1 to 10 carbon atoms; and l is an integer of 1 to 3).
Claim 7
Dependent Claim
50 words
A cation exchange membrane according to claim 1 wherein the fluorovinyl sulfonic acid monomer has the formula: ##STR7## (wherein R 5 is fluorine or CH 3 ; R 6 is fluorine or a perfluoroalkyl group having 1 to 10 carbon atoms; and k is an integer of 1 to 3).
Claim 8
Dependent Claim
19 words
A cation exchange membrane according to claim 1 wherein the high-molecular substrate film is supported by a reinforcing material.
Claim 9
Dependent Claim
77 words
A process for producing a cation exchange membrane wherein a high-molecular substrate film having a monomer of the formula: CH 2 ═CXY (wherein X is hydrogen, fluorine or CH 3 ; and Y is hydrogen or fluorine) as a monomer unit is exposed to ionizing radiation, and then the substrate film is brought into contact with a solution of a fluorovinyl sulfonic acid monomer so as to graft the fluorovinyl sulfonic acid monomer onto the substrate film.
Claim 10
Dependent Claim
77 words
A process for producing a cation exchange membrane wherein a high-molecular substrate film having a monomer of the formula: CH 2 ═CXY (wherein X is hydrogen, fluorine or CH 3 ; and Y is hydrogen or fluorine) as a monomer unit is exposed to ionizing radiation, and then the substrate film is brought into contact with a solution of a fluorovinyl sulfonic acid monomer so as to graft the fluorovinyl sulfonic acid monomer onto the substrate film.
Claim 11
Dependent Claim
18 words
A process according to claim 8 wherein the dose of ionizing radiation is from 0.5 to 50 Mrad.
Claim 12
Dependent Claim
23 words
A process according to claim 8 wherein the substrate film is exposed to the ionizing radiation in the presence of an inert gas.
Claim 13
Dependent Claim
35 words
A process according to claim 8 wherein the exposed substrate film is brought into contact with the solution of fluorovinyl sulfonic acid monomer in the presence of a solvent which is miscible with said monomer.
Claim 14
Dependent Claim
86 words
A process for producing a cation exchange membrane wherein a high-molecular substrate film having a monomer of the formula: CH 2 ═CXY (wherein X is hydrogen, fluorine or CH 3 ; and Y is hydrogen or fluorine) as a monomer unit is brought into contact with a solution of a fluorovinyl sulfonic acid monomer, and then the mixture is exposed to ionizing radiation to give a total dose of 0.5 to 20 Mrad so as to graft the fluorovinyl sulfonic acid monomer onto the substrate film.
Claim 15
Dependent Claim
86 words
A process for producing a cation exchange membrane wherein a high-molecular substrate film having a monomer of the formula: CH 2 ═CXY (wherein X is hydrogen, fluorine or CH 3 ; and Y is hydrogen or fluorine) as a monomer unit is brought into contact with a solution of a fluorovinyl sulfonic acid monomer, and then the mixture is exposed to ionizing radiation to give a total dose of 0.5 to 20 Mrad so as to graft the fluorovinyl sulfonic acid monomer onto the substrate film.
Claim 16
Dependent Claim
23 words
A process according to claim 1 wherein the substrate film is exposed to the ionizing radiation in the presence of an inert gas.
Claim 17
Dependent Claim
35 words
A process according to the claim 13 wherein the substrate film is brought into contact with the solution of fluorovinyl sulfonic acid monomer in the presence of a solvent that is miscible with said monomer.
Claim 18
Dependent Claim
105 words
A process for producing a cation exchange membrane wherein a high-molecular substrate film having a monomer of the formula: CH 2 ═CXY (wherein X is hydrogen, fluorine or CH 3 ; Y is hydrogen or fluorine) as a monomer unit is exposed to ionizing radiation to give a total dose of 0.5 to 20 Mrad, the substrate film is then brought into contact with a solution of a fluorovinyl sulfonic acid monomer, and the substrate film is further exposed to ionizing radiation to give a total dose of 0.5 to 20 Mrad so as to graft the fluorovinyl sulfonic acid monomer onto the substrate film.
Claim 19
Dependent Claim
105 words
A process for producing a cation exchange membrane wherein a high-molecular substrate film having a monomer of the formula: CH 2 ═CXY (wherein X is hydrogen, fluorine or CH 3 ; Y is hydrogen or fluorine) as a monomer unit is exposed to ionizing radiation to give a total dose of 0.5 to 20 Mrad, the substrate film is then brought into contact with a solution of a fluorovinyl sulfonic acid monomer, and the substrate film is further exposed to ionizing radiation to give a total dose of 0.5 to 20 Mrad so as to graft the fluorovinyl sulfonic acid monomer onto the substrate film.
Claim 20
Dependent Claim
41 words
A process according to claim 15 wherein the substrate film given the first dose of ionizing radiation is brought into contact with the solution of fluorovinyl sulfonic acid monomer in the presence of a solvent that is miscible with said monomer.
Claim 21
Dependent Claim
22 words
A process according to claim 15 wherein the substrate film is exposed to ionizing radiation in the presence of an inert gas.
Claim 22
Dependent Claim
29 words
A cation exchange membrane according to claim 1 of a polymer having repeating units ##STR8## and wherein said fluorovinyl sulfonic acid monomer is uniformly grafted thereto throughout said polymer.
References Cited (Backward Citations)
JPS5411098A
Cited
US4311573A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-01 | 1987-01-31 | 1987-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-01 | 1991-01-31 | 1991-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-01 | 1995-01-31 | 1995-08-02 | $7700.00 | Window Closed / Lapsed |