Macrocyclic oligoesters and compositions comprising macrocyclic oligoesters are prepared from intermediate molecular weight polyesters. In one embodiment, a diol is contacted with a dicarboxylic acid or a dicarboxylate in the presence of a catalyst to produce a composition comprising a hydroxyalkyl-tenninated...http://www.google.es/patents/US6525164?utm_source=gb-gplus-sharePatente US6525164 - Methods for converting linear polyesters to macrocyclic oligoester compositions and macrocyclic oligoesters
Methods for converting linear polyesters to macrocyclic oligoester ...
