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