US3784399A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Films of fluorinated polymer containing sulfonyl groups with one surface in the sulfonamide or sulfonamide salt form and a process for preparing such
Assignee: EIDP Inc
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Filing: 1971-09-08
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Granted: 1974-01-08
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Expires: 1991-09-08
Abstract
Abstract A film useful as an ion exchange membrane of fluorinated polymer containing pendant side chains containing sulfonyl groups which are attached to carbon atoms which have at least one fluorine atom attached thereto; one surface of the film having a majority of the sulfonyl groups of the polymer in the -(SO2NH)mQ form wherein Q is H, NH4, cation of an alkali metal and/or cation of alkaline earth metal and m is the valence of Q and the other surface of the film having the sulfonyl groups in the -(SO3)nMe form wherein Me is a cation and n is the valence of the cation and processes for preparing the film.
Inventors
- 👤 W Grot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:53
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2287; C08J5/2293; C08J2327/00; C08J2327/02; C08J2327/12; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/31504; Y10T428/3154
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
11 words
The film of claim 1 in which the polymer is perfluorinated.
Claim 2
Dependent Claim
30 words
The film of claim 2 wherein the cation of the alkali metal of Q is K or Na and the cation of the alkaline earth metal of Q is Ca.
Claim 3
Dependent Claim
20 words
The film of claim 3 wherein Me is selected from the class consisting of K, Na, H, Ca and Cu.
Claim 4
Dependent Claim
51 words
The film of claim 4 wherein Q is H, Me is H, m is 1, n is 1, and the surface of the film having a majority of the sulfonyl groups of the polymer in the -(SO2NH)m Q form is From 0.01 to 80 percent of the thickness of the film.
Claim 5
Dependent Claim
50 words
The film of claim 4 wherein Q is Na, Me is Na, m is 1, n is 1, and the surface of the film having a majority of the sulfonyl groups of the polymer in the -(SO2NH)mQ form is from 0.01 to 80 percent of the thickness of the film.
Claim 6
Dependent Claim
103 words
A film of fluorinated polymer containing pendant side chains containing sulfonyl groups, said sulfonyl groups being attached to carbon atoms which have at least one fluorine atom attached thereto; one surface of the film having a majority of the sulfonyl groups in the polymer in the -(SO2NH)m Q form wherein Q is selected from the class consisting of H, NH4, cation of an alkali metal and cation of an alkaline earth metal and m is the valence of Q, and the other surface of the film having the sulfonyl groups of the polymer comprising the -SO2M form wherein M is a halogen atom.
Claim 7
Dependent Claim
11 words
The film of claim 7 in which the polymer is perfluorinated.
Claim 8
Dependent Claim
9 words
The film of claim 8 wherein M is F.
Claim 9
Dependent Claim
30 words
The film of claim 9 wherein the cation of the alkali metal of Q is K or Na and the cation of the alkaline earth metal of Q is Ca.
Claim 10
Dependent Claim
44 words
The film of claim 10 wherein Q is H, m is 1, and the surface of the film having a majority of the sulfonyl groups of the polymer in the -SO2NH)mQ form is from 0.01 to 80 percent of the thickness of the film.
Claim 11
Dependent Claim
44 words
The film of claim 10 wherein Q is Na, m is 1, and the surface of the film having a majority of the sulfonyl groups of the polymer in the -(SO2NH)mQ form is from 0.01 to 80 percent of the thickness of the film.
Claim 12
Dependent Claim
138 words
A process for the preparation of an ion exchange membrane which comprises contacting one surface of a film of a fluorinated polymer containing pendant side chains containing sulfonyl groups, said sulfonyl groups being attached to carbon atoms which have at least one fluorine atom attached thereto and being in the -SO2M form wherein M is a halogen atom, with anhydrous ammonia so that a majority of the sulfonyl groups on said surface of said film are converted to the -SO2NH2 form,said surface comprising from 0.01 to 80 percent of the thickness of the film; removing the film from the contact with the anhydrous ammonia; and contacting the film with Ma(OH)p wherin Ma is selected from the group consisting of NH4, cation of an alkali metal and cation of an alkaline earth metal and is the valence of Ma.
Claim 13
Dependent Claim
15 words
The process of claim 13 with the additional step of contacting the film with acid.
Claim 14
Dependent Claim
15 words
The process of claim 14 with the additional step of contacting the film with cation.
Claim 15
Dependent Claim
11 words
The film of claim 1 wherein Q and Me are identical.
Claim 16
Dependent Claim
9 words
The film of claim 1 wherein Q is H.
References Cited (Backward Citations)
US3282875A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |