METHODS FOR PREPARATION OF POLYESTER OLIGOMER VIA BASE CATALYSIS

摘要

The invention relates to methods and systems for preparing macrocyclic polyester oligomer (MPO) via base catalysis. It is found that base catalysts are effective in the production of MPO, and they reduce the potential for undesired byproducts such as furans (e.g., THF) and acetaldehyde, which result from diol side reactions.

主权项

1. A method for preparing a macrocyclic polyester oligomer (MPO), the method comprising:
(a) heating a reaction mixture, the reaction mixture comprising:
(i) an alcohol, phenol, or both;(ii) a terephthalate (e.g., DMT or DPT) or, alternatively or additionally, a terephthalate precursor (e.g., TPA);(iii) a base catalyst (e.g., an organic base); and(iv) an organic solvent (different from the species in (i), (ii), and (iii) above), thereby forming MPO and polyester linears; and (b) separating the MPO from the reaction mixture.