US 10,222,696 B2  104  103  -continued  -continued  In formula (IC),  Rf’cl, wc 2  and  Wc3  are each indepen› dently fluorine or a C$_{1 }$-C$_{40 }$ straight, branched or cyclic  monovalent hydrocarbon group which may contain a het› eroatom. Illustrative examples of the monovalent hydrocar› bon group are as exemplified for R  105 . Preferably wc1,  wc 2  o/’--....../o’-.  ~  vy  6  o/’--....../o’-.  ~  vy  6  0  J:  ,......s03- 0  C  F2  0~  ~  vy  6  0  /’-.._ /  S03 - 0  C  F2  0~  ~  vy  OH  ~  In formula (18),  R11’ 1  and  R11’ 2  are each independently  fluorine or a C$_{1 }$-C$_{4}$ ,  straight, branched or cyclic monovalent  hydrocarbon group which may contain a heteroatom. Illus› trative examples of the monovalent hydrocarbon group are  as exemplified fox R  105 . Preferably  R11’ $^{1 }$and  WZ, $^{3 }$are fluorine  or C$_{1 }$-C$_{4 }$ straight fluorinated alkyl groups. Also,  R11’ 1  and  R11’ $^{2 }$may bond together to form a ring with the linkage:  --CF  $_{2}$-S0$_{2}$ -N- -S0$_{2}$----CF $_{2}$ - to  which  they  are  attached. It is preferred to form a ring structure via a  fluorinated ethylene or fluorinated propylene group. 