Patent ID: 7838608

Claim:
A fluorinated surfactant having the general formula: [R f —(O) t —CHF—(CF 2 ) n —COO − ] i X i+ (I) wherein t is 0 and wherein R f is a perfluorinated group of the formula R f 4 —[OR f 5 ] k —[OR f 6 ] m —O—CF 2 — wherein R f 4 is a perfluorinated aliphatic group of 1 to 6 carbon atoms, R f 5 and R f 6 each independently represents a linear perfluorinated alkylene of 1, 2, 3 or 4 carbon atoms and k and m each independently represent a value of 0 to 4 and wherein n is 0 or 1, X i+ represents a cation having a valence i and i is 1, 2 or 3.