METHOD FOR PRODUCING POLYESTER POLYMER AND POLYESTER POLYMER PRODUCED BY SUCH METHOD Russian patent published in 2023 - IPC C07D307/68 C08G63/181 C08G63/78 C08G63/90 C08G63/91 C08L67/02 C08K3/01 

FIELD: polymer production.

SUBSTANCE: method for obtaining a polyester polymer composition from a cyclic polyester oligomer composition containing a cyclic polyester oligomer having furan units, and to the polymer obtained by this method. The method for producing a polyester polymer composition includes the stages of ring-opening polymerization of a cyclic polyester oligomeric composition containing a cyclic polyester oligomer having furan units. The ring-opening polymerization is carried out in the presence of a plasticizer being dimethyl ether of tetraethylene glycol and a catalyst, at a temperature of 220 to 300°C, wherein the cyclic polyester oligomeric composition is characterized by a content of linear oligomeric polyester compounds having furan units at a concentration of 1 wt.% or less relative to the total weight of the cyclic polyester oligomeric composition. The Y¹ structure of this cyclic polyester oligomer having furan units is Y¹, where m is an integer from 1 to 20, preferably from 2 to 15, most preferably from 3 to 10, while substituent A is a linear unsubstituted alkyl. A polyester polymer composition used in articles containing (i) a plasticizer representing dimethyl ether of tetraethylene glycol, (ii) a cyclic polyester oligomer having furan units, and (iii) (a) a PEF polymer containing the structure, where n is an integer from 10 to 100000.

EFFECT: providing a method for obtaining a polyester polymer composition having furan units from a cyclic polyester oligomer composition containing a cyclic polyester oligomer without significant coloring and reduction in the achieved molecular weight of the polymer product.

13 cl, 13 dwg, 4 ex