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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. 2 

In formula (IC), Rf’cl, wc 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 

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