| http://www.w3.org/ns/prov#value | - wherein Rf 1 is a perfluorinated aliphatic group of 1 to 6 carbon atoms, for example up to 3 carbon atoms, Rf 2 and Rf 3 each independently represents linear or branched a perfluorinated alkylene of 1, 2, 3 or 4 carbon atoms and p and q each independently represent a value of 0 to 4 and wherein the sum of p and q is at least 1 and perfluorinated groups of the formula:
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