55  Jul. 30, 2020  US 2020/0241418 Al  -continued  Q_  [0098]  As the monomer from which recurring unit (d2) is  derived, compounds having the anions shown below are also  preferred.  RA  is as defined above.  RA  RA  F2  CF3  0  C  A......-s03- y  ’-s03- 0  C  CF3  F2  RA  RA  CF3  F2  A......-s03- 0  C  y  ’-s03- 0  C  F2  0  RA  RA  -continued  F2  CF3  0  C  A......-s03- Y’s03- 0  C  CF3  F2  RA  RA  CF3  F2  A......-s03- 0  C  y  ’-s03- 0  C  F2  0  RA  RA  0  A......-s03- F2  0  C  y  ’-s03- 0  C  F2  CF3  RA  RA 