Compounds of the formula {HEAD ~ B1} with {TAIL ~ Y} being a direct bond are diesters of macromolecular diols, wherein two hydroxy groups are attached to the polycondensate chain R1 in opposite terminal or almost terminal positions, with α,β unsaturated acids 
with
Compounds of the formula { HEAD ~ B1 } with { TAIL ~ Y } being a direct bond are diesters of macromolecular diols , wherein two hydroxy groups are attached to the polycondensate chain R1 in opposite terminal or almost terminal positions , with α , β unsaturated acids
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH