US4085071A
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US
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Ion exchange polymer film, consisting of fluorinated polymer with N-monosubstituted sulfonamido groups method and apparatus for electrolysis of alkali or alkaline earth metal halide
Assignee: EIDP Inc
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Filing: 1975-10-20
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Granted: 1978-04-18
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Expires: 1995-10-20
Abstract
Abstract An ion exchange film comprises a fluorine-containing polymer with (1) ion exchange sites present in a first layer as N-monosubstituted sulfonamido groups or salt thereof formed through reaction of a primary amine and (2) ion exchange sites present in a second layer of the film other than as said N-monosubstituted group or salt thereof. The film is suitable as a separator in a cell for electrolysis of an alkali or alkaline earth metal halide particularly sodium chloride in producing hydrogen, chlorine and caustic soda. In making concentrated caustic soda, high current efficiencies have been obtained in operation of the cell.
Inventors
- 👤 Paul Raphael Resnick
- 👤 Walther Gustav Grot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:50
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/30; B01D71/32; B01D69/00; B01D69/02; C; C08; C08F; C08F8/00; C08F8/30; C08F8/32; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2287; C08J5/2293; C25; C25B; C25B1/00; C25B1/01; C25B1/34; C25B1/46; C08J2327/00; C08J2327/02; C08J2327/12; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/269
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
188 words
A film comprising a fluorine-containing polymer containing pendant side chains with sulfonyl groups attached to a carbon atom having at least one fluorine atom connected thereto, at least 40% of the sulfonyl groups in a first layer of said film in a thickness of at least 200 angstroms present as ion exchange sites as N-monosubstituted sulfonamido groups or salt thereof formed through reaction of --SO 2 X groups, where X is fluorine or chlorine, with a primary amine, and a second layer of said film having at least a majority of the sulfonyl groups present as ion exchange sites as --(SO 2 NH) m Q or --(SO 3 ) n Me wherein Q is selected from the group consisting of H, NH 4 , cation of an alkali metal, cation of an alkaline earth metal and combinations thereof, m is the valence of Q, Me is a cation and n the valence of the cation, and the amine is a diamine of the formula NH 2 (CH 2 ) p NH 2 with p an integer from 2 to 10, methyl amine, ethyl amine, butylamine, 2-methoxyethylamine or cyclohexylamine.
Claim 2
Dependent Claim
188 words
A film comprising a fluorine-containing polymer containing pendant side chains with sulfonyl groups attached to a carbon atom having at least one fluorine atom connected thereto, at least 40% of the sulfonyl groups in a first layer of said film in a thickness of at least 200 angstroms present as ion exchange sites as N-monosubstituted sulfonamido groups or salt thereof formed through reaction of --SO 2 X groups, where X is fluorine or chlorine, with a primary amine, and a second layer of said film having at least a majority of the sulfonyl groups present as ion exchange sites as --(SO 2 NH) m Q or --(SO 3 ) n Me wherein Q is selected from the group consisting of H, NH 4 , cation of an alkali metal, cation of an alkaline earth metal and combinations thereof, m is the valence of Q, Me is a cation and n the valence of the cation, and the amine is a diamine of the formula NH 2 (CH 2 ) p NH 2 with p an integer from 2 to 10, methyl amine, ethyl amine, butylamine, 2-methoxyethylamine or cyclohexylamine.
Claim 3
Dependent Claim
18 words
The film of claim 1 wherein said sulfonyl groups in the second layer are present in ionic form.
Claim 4
Dependent Claim
75 words
The film of claim 2 wherein at least a majority of the sulfonyl groups in the second layer are present as --(SO 2 NH) m Q or --(SO 3 ) n Me wherein Q is selected from the group consisting of NH 4 , cation of an alkali metal, cation of an alkaline earth metal and combinations thereof, m is the valence of Q, Me is a cation and n the valence of th cation.
Claim 5
Dependent Claim
17 words
The film of claim 2 wherein said first and second layers extend from surfaces of said film.
Claim 6
Dependent Claim
17 words
The film of claim 1 wherein said first and second layers extend from surfaces of said film.
Claim 7
Dependent Claim
17 words
The film of claim 1 wherein the thickness of the first layer is at least one micron.
Claim 8
Dependent Claim
24 words
The film of claim 1 wherein the first layer is present to a depth of 0.1 to 30% of the thickness of the film.
Claim 9
Dependent Claim
13 words
The film of claim 7 with a thickness of 0.002 to 0.02 inches.
Claim 10
Dependent Claim
15 words
The film of claim 1 wherein the salt of the N-monosubstituted sulfonamido groups is present.
Claim 11
Dependent Claim
19 words
The film of claim 9 wherein an alkali or alkaline earth salt of the N-monosubstituted sulfonamido groups is present.
Claim 12
Dependent Claim
26 words
The film of claim 8 wherein at least 90% of the sulfonyl groups in the first layer are present as N-monosubstituted sulfonamido groups or salt thereof.
Claim 13
Dependent Claim
26 words
The film of claim 8 wherein at least 99% of the sulfonyl groups in the first layer are present as N-monosubstituted sulfonamido groups or salt thereof.
Claim 14
Dependent Claim
12 words
The film of claim 1 wherein the amine is a difunctional amine.
Claim 15
Dependent Claim
11 words
The film of claim 1 wherein the amine is ethylene diamine.
Claim 16
Dependent Claim
22 words
The film of claim 1 wherein sulfonyl groups in the second layer are presented as --SO 3 Na or --SO 3 K.
Claim 17
Dependent Claim
11 words
The film of claim 1 wherein said fluorinecontaining polymer is perfluorinated.
Claim 18
Dependent Claim
17 words
The film of claim 16 wherein said fluorinecontaining polymer is a copolymer of tetrafluoroethylene and perfluoro(3,6-dioxa-4-methyl-7-octenesulfonyl fluoride).
Claim 19
Dependent Claim
10 words
The film of claim 1 wherein the amine is butylamine.
Claim 20
Dependent Claim
10 words
The film of claim 1 wherein the amine is 2-methoxyethylamine.
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) | 1981-04-17 | 1981-10-17 | 1982-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-17 | 1985-10-17 | 1986-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-17 | 1989-10-17 | 1990-04-18 | $7700.00 | Window Closed / Lapsed |