Patent ID: 7629483

Claim:
Peroxidic perfluoropolyethers having functionality F=2 and formula: X 1 —O(CF 2 O) n1 (CF 2 CF 2 O) m1 (CF 2 (CF 2 ) z CF 2 O) p1 (O) h —X 2 (I) wherein: X 1 and X 2 , equal to or different from each other, are chain end groups selected among —CF 2 COF, —COF, —SO 2 F; n1, m1, p1 and h are integers such that the number average molecular weight is in the range 700-100,000; z=1 or 2; with the proviso that: the m1/n1 ratio is between 0.2 and 10; the p1/(n1+m1) ratio is lower than 0.05; the h/(n1+m1+p1) ratio is such that the PO content, defined as grams of active oxygen/100 g of compound, is in the range 0.8-4.5; the perfluorooxyalkylene units being statistically distributed along the polymeric chain, and wherein said peroxidic perfluoropolyethers comprise at least one —SO 2 F end group.