US4060473A
Expired / Lapsed
US
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Novel copolymers and diaphragms made therefrom
Assignee: De Nora SpA
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Filing: 1975-11-14
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Granted: 1977-11-29
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Expires: 1995-11-14
Abstract
Abstract Novel sulfonated copolymers formed by copolymerization of a halogenated monomer containing at least one fluorine atom and a monomer of the formula ##STR1## wherein X is an electron attracting group activating the hydrogen atom in the α-position so that the hydrogen may be replaced with a sulfonic group and Y is selected from the group consisting of hydrogen, methyl and ethyl and their preparation, novel diaphragms made therefrom, a diaphragm cell equipped with a diaphragm made of said sulfonated copolymer and to a method of electrolysis.
Inventors
- 👤 Luigi Giuffre
- 👤 Vittorio De Nora
- 👤 Placido Spaziante
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:28
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/34; C08F8/36; C08F2800/00; C08F2800/10
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
131 words
A diaphragm for an electrolysis cell comprising a film made of water-wettable and water-insoluble at least 60% sulfonated copolymer of (A) a monomer of the formula Y--CH═CH--X wherein X is an electron attracting group and Y is selected from the group consisting of hydrogen, methyl and ethyl and (B) a halogenated monomer of the formula ##STR5## wherein R is selected from the group consisting of hydrogen, halogen and alkyl of 1 to 4 carbon atoms optionally halogenated, Y', Y" and Y'" are individually selected from the group consisting of hydrogen and halogen with the proviso that at least one of the Y's is fluorine and the sulfonic acid group is attached to the carbon atom α to the electron attracting group, the ratio of B to A being 1:2.5 to 1:42.
Claim 2
Dependent Claim
131 words
A diaphragm for an electrolysis cell comprising a film made of water-wettable and water-insoluble at least 60% sulfonated copolymer of (A) a monomer of the formula Y--CH═CH--X wherein X is an electron attracting group and Y is selected from the group consisting of hydrogen, methyl and ethyl and (B) a halogenated monomer of the formula ##STR5## wherein R is selected from the group consisting of hydrogen, halogen and alkyl of 1 to 4 carbon atoms optionally halogenated, Y', Y" and Y'" are individually selected from the group consisting of hydrogen and halogen with the proviso that at least one of the Y's is fluorine and the sulfonic acid group is attached to the carbon atom α to the electron attracting group, the ratio of B to A being 1:2.5 to 1:42.
Claim 3
Dependent Claim
22 words
The diaphragm of claim 1 wherein the halogenated monomer is selected from the group consisting of tetrafluoroethylene, chlorotrifluoroethylene, bromotrifluoroethylene, vinylidenefluoride and hexafluoropropylene.
Claim 4
Dependent Claim
32 words
The diaphragm of claim 1 wherein the electron-attracting group is selected from the group consisting of --COOH, --COOR', --CN, --CONH 2 and --COX' X' is a halogen and R' is lower alkyl.
Claim 5
Dependent Claim
17 words
The diaphragm of claim 1 wherein the halogenated monomer is tetrafluoroethylene and the co-monomer is acrylic acid.
Claim 6
Dependent Claim
19 words
The diaphragm of claim 4 wherein the molar ratio between tetrafluoroethylene and acrylic acid is between 7:1 and 25:1.
Claim 7
Dependent Claim
20 words
The diaphragm of claim 5 wherein the molar ratio between acrylic acid and sulfonic acid is between 1:0.6 and 1:1.
Claim 8
Dependent Claim
21 words
The diaphragm of claim 1 wherein the molecular weight of the sulfonated copolymer is between 2×10 4 and 4×10 6 .
Claim 9
Dependent Claim
34 words
In a diaphragm cell comprising a plurality of anodes and cathodes and diaphragms separating each anode compartment from the corresponding cathode compartment, the improvement comprising using as the diaphragm a diaphragm of claim 1.
Claim 10
Dependent Claim
22 words
The cell of claim 8 wherein the halogenated monomer is selected from the group consisting of tetrafluoroethylene, chlorotrifluoroethylene, bromotrifluoroethylene, vinylidenefluoride and hexafluoropropylene.
Claim 11
Dependent Claim
32 words
The cell of claim 8 wherein the electron-attracting group is selected from the group consisting of --COOH, --COOR', --CN, --CONH 2 and --COX' X' is a halogen and R' is lower alkyl.
Claim 12
Dependent Claim
17 words
The cell of claim 8 wherein the halogenated monomer is tetrafluoroethylene and the co-monomer is acrylic acid.
Claim 13
Dependent Claim
19 words
The cell of claim 11 wherein the molar ratio between tetrafluoroethylene and acrylic acid is between 7:1 and 25:1.
Claim 14
Dependent Claim
20 words
The cell of claim 12 wherein the molar ratio between acrylic acid and sulfonic acid is between 1:0.6 and 1:1.
Claim 15
Dependent Claim
22 words
The cell of claim 1 wherein the halogen monomer is selected from the group consisting of tetrafluoroethylene, chlorotrifluoroethylene, bromotrifluoroethylene, vinylidenefluoride and hexafluoropropylene.
Claim 16
Dependent Claim
32 words
The cell of claim 1 wherein the electron-attracting group is selected from the group consisting of --COOH, --COOR', --CN, --CONH 2 and --COX', X' is a halogen and R' is lower alkyl.
Claim 17
Dependent Claim
17 words
The cell of claim 1 wherein the halogenated monomer is tetrafluoroethylene and the co-monomer is acrylic acid.
Claim 18
Dependent Claim
19 words
The cell of claim 16 wherein the molar ratio between tetrafluoroethylene and acrylic acid is between 7:1 and 25:1.
Claim 19
Dependent Claim
20 words
The cell of claim 17 wherein the molar ratio between acrylic acid and sulfonic acid is between 1:0.6 and 1:1.
Claim 20
Dependent Claim
45 words
In the method of electrolyzing an aqueous alkali metal chloride in a diaphragm type cell comprising at least an anode, a cathode and a diaphragm separating the anode compartment from the cathode compartment, the improvement comprising using as the diaphragm a diaphragm of claim 1.
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) | 1980-11-28 | 1981-05-30 | 1981-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-28 | 1985-05-30 | 1985-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-28 | 1989-05-30 | 1989-11-29 | $7700.00 | Window Closed / Lapsed |