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