The present invention provides methods for preparing macrocyclic polyester oligomer (MPO). More particularly, the invention relates to methods for preparing macrocyclic polyester oligomer from linear polyester.
C08J 11/18 - Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by treatment with organic material
C08G 63/18 - Dicarboxylic acids and dihydroxy compounds the acids or hydroxy compounds containing carbocyclic rings
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.
Presented herein are methods and systems for preparing polyester, e.g., polybutylene terephthalate (PBT), using a base catalyst, e.g., a heterocyclic amine such as triazabicyclodecene (TBD). It is found that such base catalysts are effective in the production of polyester, and they reduce the potential for undesired byproducts such as furans (e.g., THF) and acetaldehyde (AA), which result from diol side reactions.
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