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EP0094587A1
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Improved electrolytic cation exchange membrane
Assignee: AGC Inc
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Filing: 1983-05-09
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Granted: —
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Expires: 2003-05-09
Abstract
Abstract An electrolytic cation exchange membrane comprises a first film made of a fluorinated polymer having cation exchange groups and a second film laminated thereon, made of a fluorinated polymer having carboxylic acid groups as its ion exchange groups and containing the following repeating units (A), (B) and (C) and having a smaller thickness and greater specific electric resistance than the first film; where each of X and X' is -F, -Cl or -CF 3 , R, is a perfluoroalkyl group having from 1 to 10 carbon atoms, M is hydrogen or an alkali metal and Y is selected from the group consisting of + CF 2 x , -0 + CF 2 x , and where each of x and y is an integer of from 0 to 10 and Z is -F or R f as defined above, provided that B/A+B+C (molar ratio) and C/A+B+C (molar ratio) are from 0.01 to 0.3 and from ' 0.05 to 0.5, respectively.
Inventors
- 👤 Haruhisa Miyake
- 👤 Manabu Suhara
- 👤 Hiroshi Mori
- 👤 Yoshihiko Saito
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 10:21
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2206; C08J5/2275; C08J5/2281; C08J2327/00; C08J2327/02; C08J2327/12; C08J2327/18
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
153 words
An electrolytic cation exchange membrane which comprises a first film made of a fluorinated polymer having cation exchange groups and a second film laminated thereon, made of a fluorinated polymer having carboxylic acid groups as its ion exchange groups and containing the following repeating units (A), (B) and (C) and having a smaller thickness and greater specific electric resistance than the first film; where each of X and X' is -F, -Cl or -CF 3 , R f is a perfluoroalkyl group having from 1 to 10 carbon atoms, M is hydrogen or an alkali metal and Y is selected from the group consisting of CF 2 x , where each of x and y is an integer of from 0 to 10 and Z is -F or R f as defined above, provided that B/A+B+C (molar ratio) and C/A+B+C (molar ratio) are from 0.01 to 0.3 and from 0.05 to 0.5, respectively.
Claim 2
Dependent Claim
153 words
An electrolytic cation exchange membrane which comprises a first film made of a fluorinated polymer having cation exchange groups and a second film laminated thereon, made of a fluorinated polymer having carboxylic acid groups as its ion exchange groups and containing the following repeating units (A), (B) and (C) and having a smaller thickness and greater specific electric resistance than the first film; where each of X and X' is -F, -Cl or -CF 3 , R f is a perfluoroalkyl group having from 1 to 10 carbon atoms, M is hydrogen or an alkali metal and Y is selected from the group consisting of CF 2 x , where each of x and y is an integer of from 0 to 10 and Z is -F or R f as defined above, provided that B/A+B+C (molar ratio) and C/A+B+C (molar ratio) are from 0.01 to 0.3 and from 0.05 to 0.5, respectively.
Claim 3
Dependent Claim
38 words
The electrolytic cation exchange membrane according to Claim 1 wherein the first and second film are laminated so that the first film is disposed on the anode side and the second film is disposed on the cathode side.
Claim 4
Dependent Claim
24 words
The electrolytic cation exchange membrane according to Claim 1 or 2 wherein the cation exchange groups of the first film are sulfonic acid groups.
Claim 5
Dependent Claim
38 words
4 . The electroaytic cation exchange membrane according to Claim 1, 2 or 3 wherein the cation exchange groups of the first film are carboxylic acid groups and have a greater ion exchange capacity than the second film.
Claim 6
Dependent Claim
39 words
The electrolytic cation exchange membrane according to Claim 1, 2, 3 or 4 wherein the first film has a thickness of from 150 to 500 µm and the second film has a thickness of from 5 to 50 um.
Claim 7
Dependent Claim
34 words
The electrolytic cation exchange membrane according to Claim 1, 2, 3, 4 or 5 wherein the first film has a thickness of from 2 to 30 times of the thickness of the second film.
Claim 8
Dependent Claim
26 words
An electrolytic process for water or an aqueous solution wherein the cation exchange membrane according to Claim 1, 2, 3, 4, 5 or 6 is used.
Claim 9
Dependent Claim
18 words
The electrolytic process according to Claim 7 wherein the aqueous solution is an aqueous alkali metal chloride solution.
Claim 10
Dependent Claim
20 words
The electrolytic process according to Claim 8 wherein the aqueous alkali metal chloride solution is an aqueous sodium chloride solution.
Claim 11
Dependent Claim
26 words
An electrolytic cell for water or an aqueous solution wherein the cation exchange membrane according to Claim 1, 2, 3, 4, 5 or 6 is installed.
Claim 12
Dependent Claim
18 words
The electrolytic cell according to Claim 10 wherein the aqueous solution is an aqueous alkali metal chloride solution.
Claim 13
Dependent Claim
20 words
The electrolytic cell according to Claim 11 wherein the aqueous alkali metal chloride solution is an aqueous sodium chloride solution.
References Cited (Backward Citations)
GB1401290A
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Cited
US4224121A
Cited
FR2457880A1
Cited
EP0028943A1
Cited
GB2064586A
Cited
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