{HEAD ~ An example} of {TAIL ~ two additional and especially preferred gamma butyrolactone} derived monomer types according to the present invention are shown below: ##STR5## 
of
{ HEAD ~ An example } of { TAIL ~ two additional and especially preferred gamma butyrolactone } derived monomer types according to the present invention are shown below : # # STR5 # #
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH