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US 5,475,143 AGranted
Fluorinated ion-exchange polymers and intermediates therefor
AssigneeE. I. Du Pont de Nemours and Company
InventorAndrew E. Feiring
Life of this patent
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Abstract
Disclosed herein are partially fluorinated (co)polymers containing sulfonic acid or sulfonate salt groups, processes for making those polymers, and intermediates for those (co)polymers. The (co)polymers are useful as ion-exchange resins and (in the sulfonic acid form) acid catalysts.
Claims4
A compound of the formula
- CF.sub.2 .dbd.CFOCH.sub.2 CF.sub.2 (CF.sub.2).sub.n SR.sup.1(V)
- wherein R.sup.1 is an alkyl group containing 1 to 10 carbon atoms;
- and n is an integer of 1 to 10.
Dependencies are inferred from the claim text.