FIELD: chemistry.
SUBSTANCE: method of producing said polymer involves polycondensation of a polyester polymer in the presence of a polycondensation catalyst, adding a compound containing a catalyst deactivator after the polyester polymer achieves characteristic viscosity of 0.45 dl/g. Further, characteristic viscosity of the polyester polymer is increased to 0.72 dl/g to obtain a polyester polymer. The obtained polyester polymer has concentration of terminal vinyl groups equal to 0.8 microeq./g and rate of formation of acetaldehyde less than 22 ppm.
EFFECT: obtaining a polyester polymer with low content of acetaldehyde and high characteristic viscosity, excluding the expensive solid-state polymerisation step by obtaining the polymer in a completely molten phase.
20 cl, 9 tbl, 6 ex
