| http://www.w3.org/ns/prov#value | - The preferred Rf group are fully or substantially fluorinated and are preferably thoseprefluorinated aliphatic radicals of the formula --C.sub.n F.sub.2n+1, where n, for example, is from 4 to 12.In the formula, R.sup.1 is a linking group and x is 0 or 1.
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