METHOD OF PRODUCING OLIGO- AND POLYETHYLENE TEREPHTHALATES Russian patent published in 2014 - IPC C08G63/85 C08F4/20 

FIELD: chemistry.

SUBSTANCE: described is a method of producing oligo- and polyethylene terephthalates, which involves polycondensation of terephthalic acid and ethylene glycol in the presence of a diantimony trioxide catalyst while heating, the method being characterised by that a polyfluorinated alcohol is further added when mixing the ingredients, said alcohol being selected from 1,1,3-trihydroperfluoropropanol-1, 1,1,5-trihydroperfluoropentanol-1, 1,1,7-trihydroperfluoroheptanol-1 and 1,1,9-trihydroperfluorononanol-1, in situ reaction with diantimony trioxide of which produces a cocatalyst of formula: Sb(OCH₂(CF₂CF₂)_nH)₃ n=1-4.

EFFECT: obtaining oligo- and polyethylene terephthalates in the presence of a cocatalyst, the method being characterised by easy separation of the catalyst system from reaction products and high degree of polymerisation of the obtained polyester.

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