Patent US1834850A successfully refreshed from Google Patents.
US3909378A
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Composite cation exchange membrane and use thereof in electrolysis of an alkali metal halide
Assignee: EIDP Inc
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Filing: 1974-06-21
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Granted: 1975-09-30
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Expires: 1994-06-21
Abstract
Abstract A composite film of fluorinated cation exchange polymer containing sulfonyl groups in ion exchange form whereby one surface of the film to a depth no more than one-third of the film''s thickness contains the polymer at an equivalent weight of at least 250 greater than the equivalent weight of the polymer comprising the remaining thickness of the film. The film may be employed in an electrolytic cell in the production of halogen and alkali metal hydroxide from an alkali metal halide. In the cell the film separates the anode and cathode compartments with the high equivalent weight polymer side facing the cathode portion of the cell.
Inventors
- 👤 Peter Newton Walmsley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:33
CPC Classifications
B; B01; B01J; B01J47/00; B01J47/12; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/12; B32B27/28; B32B27/286; B32B7/00; B32B7/02; C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2206; C08J5/2218; C08J5/2231; C08J5/2237; B32B2457/00; C08J2327/00; C08J2327/02; C08J2327/12; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
70 words
A COMPSITE FILM OF TWO SECTIONS OF FLUORINATED POLYMER WITH PENDANT SIDE CHAIMS CONTAINING SULFONYL GROUPS, SAID SULFONYL GROUPS PRESENT AS ION EXCHANGE SITES AND ATTACHED TO CARBON ATOMS WHICH HAVE AT LEAST ON FLUORINE ATOM ATTACHED THERETO: A FIRST SECTION OF THE POLYMER CONSITUTES A THICKNES OF NOT MORE THAN ONE-THIRD OF SAID FILM AT AN EQUIVALENT WEIGHT AT LEAST 250 GREATER THAN THE SECOND SECTION OF SAID FILM.
Claim 2
Dependent Claim
70 words
A COMPSITE FILM OF TWO SECTIONS OF FLUORINATED POLYMER WITH PENDANT SIDE CHAIMS CONTAINING SULFONYL GROUPS, SAID SULFONYL GROUPS PRESENT AS ION EXCHANGE SITES AND ATTACHED TO CARBON ATOMS WHICH HAVE AT LEAST ON FLUORINE ATOM ATTACHED THERETO: A FIRST SECTION OF THE POLYMER CONSITUTES A THICKNES OF NOT MORE THAN ONE-THIRD OF SAID FILM AT AN EQUIVALENT WEIGHT AT LEAST 250 GREATER THAN THE SECOND SECTION OF SAID FILM.
Claim 3
Dependent Claim
25 words
The film of claim 1 wherein the second section of low equivalent weight portion of the film has an equivalent weight of at least 1,000.
Claim 4
Dependent Claim
23 words
The film of claim 2 wherein the first section of high equivalent weight polymer has an equivalent weight of no more than 2,000.
Claim 5
Dependent Claim
23 words
The film of claim 1 wherein the first section of high equivalent weight polymer constitutes no more than one-fifth of the film thickness.
Claim 6
Dependent Claim
23 words
The film of claim 1 wherein the first section of high equivalent weight polymer constitutes no more than one-tenth of the film thickness.
Claim 7
Dependent Claim
23 words
The film of claim 1 wherein the first section of high equivalent weight polymer has a thickness of no more than one mil.
Claim 8
Dependent Claim
23 words
The film of claim 1 wherein the first section of high equivalent weight polymer has a thickness of no more than 0.5 mil.
Claim 9
Dependent Claim
20 words
The film of claim 1 wherein a reinforcing material is encapsulated within the second section of low equivalent weight polymer.
Claim 10
Dependent Claim
24 words
The film of claim 1 wherein the ion exchange sites of the high and low equivalent weight portions of the polymer are the same.
Claim 11
Dependent Claim
23 words
The film of claim 1 wherein the ion exchange sites of the high and low equivalent weight portions of the polymer are different.
Claim 12
Dependent Claim
125 words
In a process of production of halogen and alkali metal hydroxide by electrolysis of an alkali metal halide employing separate anode and cathode sections in an electrolytic cell, the improvement comprising passing ions of said metal through a composite film of two sections of a fluorinated polymer with pendant side chains containing sulfonyl groups, said sulfonyl groups present as ion exchange sites and attached to carbon atoms which have at least one fluorine atom attached thereto with a first section of the polymer constitutes a thickness of not more than one-third of said film at an equivalent weight at least 250 greater than the second section of said film, said film positioned in the cell with the high equivalent weight polymer facing the cathode section.
Claim 13
Dependent Claim
125 words
In a process of production of halogen and alkali metal hydroxide by electrolysis of an alkali metal halide employing separate anode and cathode sections in an electrolytic cell, the improvement comprising passing ions of said metal through a composite film of two sections of a fluorinated polymer with pendant side chains containing sulfonyl groups, said sulfonyl groups present as ion exchange sites and attached to carbon atoms which have at least one fluorine atom attached thereto with a first section of the polymer constitutes a thickness of not more than one-third of said film at an equivalent weight at least 250 greater than the second section of said film, said film positioned in the cell with the high equivalent weight polymer facing the cathode section.
Claim 14
Dependent Claim
31 words
The process of claim 11 wherein said ions pass through a composite film wherein the first section of high equivalent weight polymer constitutes no more than one-fifth of the film thickness.
Claim 15
Dependent Claim
31 words
The process of claim 11 wherein said ions pass through a composite film wherein the first section of high equivalent weight polymer constitutes no more than one-tenth of the film thickness.
Claim 16
Dependent Claim
100 words
An electrolytic cell comprising a housing with separate anode and cathode sections, said cell separated by a composite film of fluorinated polymer with pendant side chains containing sulfonyl groups said sulfonyl groups present as ion exchange sites and attached to carbon atoms which have at least one fluorine atom attached thereto with a first section of the polymer constitutes a thickness of not more than one-third of said film has an equivalent weight at least 250 greater than the remaining thickness of said film, said film positioned in the cell with the high equivalent weight polymer facing the cathode section.
Claim 17
Dependent Claim
100 words
An electrolytic cell comprising a housing with separate anode and cathode sections, said cell separated by a composite film of fluorinated polymer with pendant side chains containing sulfonyl groups said sulfonyl groups present as ion exchange sites and attached to carbon atoms which have at least one fluorine atom attached thereto with a first section of the polymer constitutes a thickness of not more than one-third of said film has an equivalent weight at least 250 greater than the remaining thickness of said film, said film positioned in the cell with the high equivalent weight polymer facing the cathode section.
Claim 18
Dependent Claim
23 words
The cell of claim 14 wherein the first section of high equivalent weight polymer constitutes no more than one-fifth of the film thickness.
Claim 19
Dependent Claim
23 words
The cell of claim 15 wherein the first section of high equivalent weight polymer constitutes no more than one-tenth of the fiLm thickness.
References Cited (Backward Citations)
US3692569A
Cited
US3784399A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |