METHOD OF PRODUCING A CYCLIC OLIGOMER, A CYCLIC OLIGOMER OBTAINED BY THIS METHOD, AS WELL AS A METHOD FOR POLYMERISATION THEREOF Russian patent published in 2022 - IPC C08G63/181 C08G63/81 C08G63/90 C08G63/91 C07C67/465 C07C69/608 

FIELD: chemical or physical processes.

SUBSTANCE: present invention relates to a method of producing a cyclic polyester oligomer composition containing cyclic polyester oligomers, which contain from two to five repeating links and contain furan links. This method includes the following steps: reacting a monomer composition and a diol at a linear oligomerisation step to obtain a linear polyester oligomer composition; reacting the linear polyester oligomer composition in a cyclisation step (DA-C) to obtain a cyclic polyester oligomer composition and a diol by-product; diol by-product is removed by evaporation at step of cyclisation by distillation (DA-C). Bifunctional furan derivative contains two functional groups selected from a group consisting of a carboxylic acid or an ester. Linear polyester oligomer composition contains linear oligomeric particles which contain one or more furan units and from two to four repeating units. Cyclic polyester oligomer composition contains cyclic oligomers which contain from two to five repeating units and contain furan units.

EFFECT: development of an improved method of producing a cyclic polyester oligomer containing furan links, and the development of an improved commercially acceptable method of using the cyclic polyester oligomer composition in the production of a polyester polymer suitable for large-scale industrial enterprises.

12 cl, 9 dwg, 13 ex