Methods for converting linear polyesters to macrocyclic oligoester compositions and macrocyclic oligoesters

Is obtained of the ring a polyester and an of the ring a polyester composition is a medium molecular weight of preparing. A separate compulsive, presence of a catalyst; one of contacted by the method comprises with one dicarboxylic acid or carboxylic ester with a hydroxyl alkyl wheels oligomer polyester composition. Heated to a hydroxyl alkyl a wheels polyester, to produce a comprises a medium molecular weight of the polyester composition, and molecular weight the molecular weight of the polyester preferably from about 20,000 Daltons to about 70,000 Daltons. Heating the medium molecular weight polyester, wherein the heating or the heating process, adding the solvent, to produce a comprises a large and a polyester composition. The step a is selected from of the inner ring polyester's a polymer composition of the ring a polyester.