0 to about 95% by {TAIL ~ weight} of {HEAD ~ a structural unit} represented by the formula ##STR14## 
0 to about 95 % by { TAIL ~ weight } of { HEAD ~ a structural unit } represented by the formula # # STR14 # #
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH