0 to about 95% by weight of a structural unit represented by the formula ##STR5## wherein {HEAD ~ X2} is hydrogen, {TAIL ~ fluorine} or methyl and X3 is C1 C10 alkyl group or C2 C10 fluoroalkyl group ; and 
0 to about 95 % by weight of a structural unit represented by the formula # # STR5 # # wherein { HEAD ~ X2 } is hydrogen , { TAIL ~ fluorine } or methyl and X3 is C1 C10 alkyl group or C2 C10 fluoroalkyl group ; and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH