C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
402/260, 402/321
C08F 8/12 (2006.01)
Patent
CA 1231198
- 1 - Abstract of the disclosure: Substantially non-crosslinked fluorocarbon poly- mers containing carboxyl groups are prepared starting from non-crosslinked and in some cases new, fluorocarbon polymers in which the linear macromolecules carry side chains containing the end group -CHFX (X is F or CF3). The starting polymers are first reacted with peroxo- disulfuryl difluoride FSO2O-OSO2F to give the corres- ponding fluorosulfato derivatives containing the side chain end groups Image (X is F or CF3). In the event that X is F, these derivatives are then converted into the corresponding carboalkoxy derivatives by means of an alcohol, the fluorosulfato group being split off, and these carboalkoxy derivatives are then converted by saponification into the products containing the free carboxyl groups; the fluorosulfato derivatives can also be hydrolyzed with water, if appropriate in the presence of an inert solvent and/or bases, to give, - 2 - without further treatment, the products containing the free carboxyl groups. The fluorosulfato derivatives in which X is CF3 in the side chain end groups are first decomposed in the presence of catalytic amounts of alkali metal fluorides and/or aprotic nitrogen bases to give the products con- taining the side chain end groups Image and the latter are then hydrolyzed to give the products containing the free carboxyl group. Virtually non-crosslinked fluorocarbon polymers containing carboxyl groups are of industrial importance in the form of cation exchanger membranes in electrolytic cells, particularly in chlor-alkali electrolysis.
422387
Blickle Peter
Brandrup Johannes
Millauer Hans
Schwertfeger Werner
Siegemund Gunter
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
Hoechst Aktiengesellschaft
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