US4246090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel cationic membranes
Assignee: De Nora SpA
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Filing: 1979-02-22
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Granted: 1981-01-20
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Expires: 1999-02-22
Abstract
Abstract Cationic membranes permeable to ions but fluid impermeable comprising a partly sufonated terpolymer of styrene, divinylbenzene and at least one member of the group consisting of 2-vinylpyridine, 4-vinylpyridine and acrylic acid, the degree of sulfonation varying through the membrane cross-section from a maximum at the anodic surface to a minimum at the cathodic surface, their preparation, their use in electrolysis cells and electrochemical processes.
Inventors
- 👤 Oronzio De Nora
- 👤 Luigi Giuffre
- 👤 Giovanni Modica
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:47
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2287; C08J2339/00; C08J2339/04; C08J2339/08; C08J2353/00; C08J2353/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
58 words
A fluid impermeable cation exchange membrane comprising a partly sulfonated terpolymer of styrene, divinylbenzene and at least one member of the group consisting of 2-vinylpyridine and 4-vinylpyridine, the degree of sulfonation varying through the membrane cross-section from a maximum on the surface adapted to face the anode to a minimum at the surface adapted to face the cathode.
Claim 2
Dependent Claim
58 words
A fluid impermeable cation exchange membrane comprising a partly sulfonated terpolymer of styrene, divinylbenzene and at least one member of the group consisting of 2-vinylpyridine and 4-vinylpyridine, the degree of sulfonation varying through the membrane cross-section from a maximum on the surface adapted to face the anode to a minimum at the surface adapted to face the cathode.
Claim 3
Dependent Claim
35 words
The cation exchange membrane of claim 1 wherein the molar ratio of styrene to the vinylpyridine is between 1/8 and 1/1 and the molar percentage of divinylbenzene in the copolymer is from 8 to 20%.
Claim 4
Dependent Claim
51 words
The cation exchange membrane of claim 1 wherein the degree of sulfonation expressed in equivalent weight referred to the sulfonic acid groups is between 400 and 1300 at the surface of the membrane facing the anode and is between 1000 and 3000 at the surface of the membrane facing the cathode.
Claim 5
Dependent Claim
44 words
A membrane electrochemical cell comprising a cell housing containing at least one anode in an anode compartment and at least one cathode in a cathode compartment forming on interelectrodic gap with a cation exchange membrane of claim 1 separating the anode and cathode compartments.
Claim 6
Dependent Claim
56 words
The cell of claim 4 wherein the sulfonated terpolymer is a terpolymer of styrene, divinylbenzene and at least one member of the group consisting of 2- and 4-vinylpyridine wherein the molar ratio of styrene to the vinylpyridine is between 1/8 and 1/1 and the molar percentage of divinylbenzene in the copolymer is from 8 to 20%.
Claim 7
Dependent Claim
49 words
The cell of claim 4 wherein the degree of sulfonation expressed in equivalent weight referred to the sulfonic acid groups is between 400 and 1300 at the surface of the membrane facing the anode and is between 1000 and 3000 at the surface of the membrane facing the cathode.
Claim 8
Dependent Claim
50 words
An electrolytic process for the preparation of a chemical product comprising placing an electrolyte containing the elements of the product to be produced in an electrolysis cell of claim 4 and passing an electrolysis current through the anode, cathode and electrolyte and removing the said chemical product from the cell.
Claim 9
Dependent Claim
56 words
The process of claim 7 wherein the sulfonated terpolymer is a terpolymer of styrene, divinylbenzene and at least one member of the group consisting of 2- and 4-vinylpyridine wherein the molar ratio of styrene to the vinylpyridine is between 1/8 and 1/1 and the molar percentage of divinylbenzene in the copolymer is from 8 to 2%.
Claim 10
Dependent Claim
49 words
The process of claim 7 wherein the degree of sulfonation expressed in equivalent weight referred to the sulfonic acid groups is between 400 and 1300 at the surface of the membrane facing the anode and is between 1000 and 3000 at the surface of the membrane facing the cathode.
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) | 1984-01-20 | 1984-07-21 | 1985-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-20 | 1988-07-21 | 1989-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-20 | 1992-07-21 | 1993-01-20 | $7700.00 | Window Closed / Lapsed |