Aug.  27,  2020  146  US 2020/0272048 Al  [0128]  In formula (IB),  R11’ 1  and  R11’ 2  are each indepen› dently fluorine or a C$_{1 }$-C$_{40 }$monovalent hydrocarbon group  which may contain a heteroatom. The monovalent hydro› carbon group may be straight, branched or cyclic, and  examples thereof are as exemplified above for R 107 . Pref› erably  R11’ $^{1 }$and  R11’ $^{2 }$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 that a combination of  R11’ 1  and  R11’ 2  be a fluorinated ethylene or fluorinated pro› pylene group.  [0129]  In formula (IC),  W’cl,  Wc 2  and  Wc3  are each inde› pendently fluorine or a C$_{1 }$-C$_{40 }$ monovalent hydrocarbon  group which may contain a heteroatom. The monovalent  hydrocarbon group may be straight, branched or cyclic, and  examples thereof are as exemplified above for R 107 . Pref› erably wc1,  wc 2  and  wc3  are fluorine or  cl  -C4 straight  fluorinated alkyl groups. Also, wc1 and  Wc 2  may bond  together to form a ring with the linkage: -CF$_{2}$-S0$_{2}$ - C-S02----CF  2 - to which they are attached.  It  is preferred  that a combination ofWc1 and  wc $^{2 }$be a fluorinated ethylene  or fluorinated propylene group.  [0130]  In formula (ID),  wd  is a Cl-C40 monovalent hydro› carbon group which may contain a heteroatom. The mon› ovalent hydrocarbon group may be straight, branched or  cyclic, and examples thereof are as exemplified above for  R107_  -continued  0  CF3  o~o~c,,,,,s0 3 - F2  0  MYO  0  0  AcO  -continued  AcO  0 