Patent US2676348A successfully refreshed from Google Patents.
Patent EP0057065B1 successfully refreshed from Google Patents.
EP0057065B1
Expired / Lapsed
EP
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Production of cation permselective membrane and electrolytic cell containing said membrane
Assignee: Orica Ltd
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Filing: 1982-01-14
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Granted: 1984-05-16
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Expires: 2002-01-14
Abstract
No abstract record available.
Inventors
- 👤 John Stewart Moilliet
- 👤 Michael Vojtech Markus
- 👤 Andrew Arthur Lindley
- 👤 George Henry Barnett
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 06:09
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/20; C08J5/22; C08J5/2287; C08J5/2293; C08J2327/00; C08J2327/02; C08J2327/12; C08J2327/18
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
89 words
A process for producing a cation permselective membrane of improved resistance to back-migration of hydroxyl ions when the membrane is used in a chlor-alkali electrolytic cell, the process comprising irradiating a cation permselective membrane comprising a fluorine-containing polymer having cation exchange groups with high energy radiation to generate free-radical sites therein and contacting the membrane with monomeric material comprising a fluorine-containing ethylenically unsaturated tertiary alcohol, or derivative thereof, the monomeric material graft copolymerising with the fluorine-containing polymer to form a tertiary alcohol group-containing polymer chemically bonded to the membrane.
Claim 2
Dependent Claim
89 words
A process for producing a cation permselective membrane of improved resistance to back-migration of hydroxyl ions when the membrane is used in a chlor-alkali electrolytic cell, the process comprising irradiating a cation permselective membrane comprising a fluorine-containing polymer having cation exchange groups with high energy radiation to generate free-radical sites therein and contacting the membrane with monomeric material comprising a fluorine-containing ethylenically unsaturated tertiary alcohol, or derivative thereof, the monomeric material graft copolymerising with the fluorine-containing polymer to form a tertiary alcohol group-containing polymer chemically bonded to the membrane.
Claim 3
Dependent Claim
30 words
A process as claimed in claim 1 in which the fluorine-containing polymer of the cation-exchange membrane is a perfluorinated polymer containing sulphonic, carboxylic, or phosphonic acid groups, or derivatives thereof.
Claim 4
Dependent Claim
21 words
A process as claimed in claim 1 or claim 2 in which there is used a _perfluorinated ethylenically unsaturated tertiary alcohol.
Claim 5
Dependent Claim
22 words
A process as claimed in any one of claims 1 to 3 in which the fluorine-containing ethylenically unsaturated tertiary alcohol comprises hexafluoro-2-trifluoromethylbut-3-ene-2-ol.
Claim 6
Dependent Claim
21 words
A process as claimed in any one of claims 1 to 4 in which the monomeric material comprises a perfluorinated olefin.
Claim 7
Dependent Claim
26 words
A process as claimed in any one of claims 1 to 5 in which the cation exchange membrane is in the form of a thin film.
Claim 8
Dependent Claim
20 words
A process as claimed in any one of claims 1 to 6 in which the high energy radiation comprises y-rays.
Claim 9
Dependent Claim
29 words
A process as claimed in any one of claims 1 to 7 in which the graft copolymerisation produces a weight increase of the membrane of at least 1 percent.
Claim 10
Dependent Claim
18 words
A cation permselective membrane produced by a process as claimed in any one of claims 1 to 8.
Claim 11
Dependent Claim
13 words
An electrolyte cell containing a cation permselective membrane as claimed in claim 9.
References Cited (Backward Citations)
No citation records indexed.
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