Novel copolymers and diaphragms made therefrom
AssigneeOronzio de Nora Impianti Elettrochimici S.p.A.
InventorsLuigi Giuffre, Vittorio DE Nora, Placido Spaziante
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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 .alpha.-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.
Claims19
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.dbd.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 .alpha. to the electron attracting group, the ratio of B to A being 1:2.5 to 1:42.
Dependencies are inferred from the claim text.