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US 4,329,478 AGranted
Cyclic perfluoroaliphaticdisulfonic acid anhydrides
AssigneeMinnesota Mining and Manufacturing Company
InventorFred E. Behr
Life of this patent
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Abstract
Cyclic perfluoroaliphaticdisulfonic acid anhydrides, sulfonamide derivatives thereof, a process for making the same, curable compositions containing cyclic perfluoroaliphaticdisulfonic acid anhydrides or sulfonamide derivatives thereof and cationically-sensitive monomers, and a process for using cyclic perfluoroaliphaticdisulfonic acid anhydrides or sulfonamide derivatives thereof as catalysts for the cure of cationically-sensitive monomers.
Claims6
Cyclic anhydrides of perfluoroaliphaticdisulfonic acids, having the formula:
- ##STR11## wherein R.sub.f is perfluoroalkylene having 2 to 5 catenary carbon atoms or perfluorocycloalkylene having 4 to 7 ring atoms, R.sub.f optionally being substituted by one or more straight chain, branched, or cyclic perfluoroalkyl groups of 1 to 12 carbon atoms, with R.sub.f having a total of up to 14 carbon atoms.
Dependencies are inferred from the claim text.