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