For example, to provide acid labile acetic acid groups pendant to the resin binder backbone, the preformed resin binder may be condensed with a compound of the formula L???CR8R9C(???O)???OR10, where L is a leaving group such as bromide or chloride as described above, R8 and R9 are, each independently hydrogen, an electron withdrawing group such as halogen (particularly F, Cl or Br), or substituted