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US4189540A
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Process for producing cation exchange membrane by impregnating a diene monomer having carboxylic acid groups into a fluorinated membrane having cation exchange groups and polymerizing
Assignee: Tosoh Corp
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Filing: 1979-01-18
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Granted: 1980-02-19
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Expires: 1999-01-18
Abstract
Abstract A cation exchange membrane is produced by impregnating a diene derivative having carboxylic acid group and/or carboxylic acid convertible group into a cation exchange membrane of a fluorinated polymer having at least one type cation exchange groups having lower acidity than that of sulfonic acid group wherein a ratio of sulfonic acid groups to total cation exchange groups on one surface (A surface layer) is higher than that of the other surface (B surface layer); performing a partial polymerization of the diene derivative and dipping the resulting membrane into an organic solvent which is miscible with water and has a boiling point of higher than 30 DEG C. at 760 mmHg; holding the membrane between a pair of smooth plates; and heating the membrane at 50 DEG to 180 DEG C.; and if the diene derivative having carboxylic acid convertible group is used, converting said groups into carboxylic acid groups.
Inventors
- 👤 Toru Seita
- 👤 Kenji Takahashi
- 👤 Shunichi Asami
- 👤 Akihiko Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:45
CPC Classifications
C; C25; C25B; C25B13/00; C25B13/04; C25B13/08; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2206; C08J5/2275; C08J5/2281; C08J2327/00; C08J2327/02; C08J2327/12; C08J2353/00; C08J2353/02
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
141 words
A process for producing a cation exchange membrane which comprises impregnating a diene derivative having carboxylic acid group and/or carboxylic acid convertible group into a cation exchange membrane of a fluorinated polymer having at least one type cation exchange groups having lower acidity than that of sulfonic acid group wherein a ratio of sulfonic acid groups to total cation exchange groups on one surface (A surface layer) is higher than that of the other surface (B surface layer); performing a partial polymerization of the diene derivative and dipping the resulting membrane into an organic solvent which is miscible with water and has a boiling point of higher than 30° C. at 760 mmHg and heating the membrane at 50° to 180° C.; and if the diene derivative having carboxylic acid convertible group is used, converting said groups into carboxylic acid groups.
Claim 2
Dependent Claim
141 words
A process for producing a cation exchange membrane which comprises impregnating a diene derivative having carboxylic acid group and/or carboxylic acid convertible group into a cation exchange membrane of a fluorinated polymer having at least one type cation exchange groups having lower acidity than that of sulfonic acid group wherein a ratio of sulfonic acid groups to total cation exchange groups on one surface (A surface layer) is higher than that of the other surface (B surface layer); performing a partial polymerization of the diene derivative and dipping the resulting membrane into an organic solvent which is miscible with water and has a boiling point of higher than 30° C. at 760 mmHg and heating the membrane at 50° to 180° C.; and if the diene derivative having carboxylic acid convertible group is used, converting said groups into carboxylic acid groups.
Claim 3
Dependent Claim
46 words
A process according to claim 1 wherein the B surface layer of the cation exchange membrane comprises --O--CF 2 --COOM (M represents H, an alkali metal atom or ammonium group) and the residual part comprises --O--CF 2 --CF 2 --SO 3 M (M is defined above).
Claim 4
Dependent Claim
77 words
A process according to claim 1 wherein the B surface layer of the cation exchange membrane comprises --SO 2 NMR {M represents H, an alkali metal atom or ammonium group and R represents --C n H 2n+1 (n is 0 to 6); --C m H 2m COOM (m is 1 to 8; M is defined above), phenyl group or ##STR16## (p is 0 to 3) and the residual part comprises --SO 3 M (M is defined above)}.
Claim 5
Dependent Claim
37 words
A process according to claim 1 wherein the B surface layer comprises --O--CF 2 COOM (M is defined above) and ##STR17## and the residual part comprises --O--CF 2 --CF 2 --SO 3 M (M is defined above).
Claim 6
Dependent Claim
15 words
A process according to claim 1 wherein the B surface layer comprises phosphoric acid group.
Claim 7
Dependent Claim
35 words
A process according to claim 1 wherein the cation exchange membrane consists of two parts havig different ion exchange capacity and the B surface layer is in a side of the lower ion exchange capacity.
Claim 8
Dependent Claim
29 words
A process according to claim 1 wherein the cation exchange membrane is swollen in an organic solvent and the organic solvent was removed from the membrane before the treatment.
Claim 9
Dependent Claim
21 words
A process according to claim 1 wherein the cation exchange membrane swollen with an organic solvent is heat-treated before the treatment.
Claim 10
Dependent Claim
24 words
A process according to claim 7 or 8 wherein the cation exchange membrane is swollen before holding it between a pair of smooth plates.
Claim 11
Dependent Claim
28 words
A process according to claim 7 or 8 wherein the organic solvent has a solubility to water of more than 0.1 g/100 g.H 2 O at room temperature.
Claim 12
Dependent Claim
16 words
A process according to claim 8 wherein the heat-treatment is performed at 60° to 120° C.
Claim 13
Dependent Claim
25 words
A process according to claim 1 wherein the diene derivative having carboxylic acid group or carboxylic acid convertible group is a conjugated or non-conjugated diene.
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) | 1983-02-18 | 1983-08-20 | 1984-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-18 | 1987-08-20 | 1988-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-18 | 1991-08-20 | 1992-02-19 | $7700.00 | Window Closed / Lapsed |