FIELD: chemistry.
SUBSTANCE: method implies: adding molten polyalkylenetherephthalate pre-polymer, which contains 70% (mol) or more of ethylentherephthalate or 1,4-butylenetherephthalate repeating units and has viscosity index [η] within 0.2 to 2 dl/g, via supply port into polymerisation reactor; discharging the pre-polymer introduced through the perforated plate holes; and polymerising pre-polymer under reduced pressure, polymer being let to drop along the open-to-the-outside structural member surface, at temperature from pre-polymer [crystal melting point -10°С] and more to pre-polymer [crystal melting point +30°С] and less under conditions described by formula S1/S2 > 1, where S1 stands for surface area of polyalkylenetherephthalate being dropped, and S2 stands for area of structural member contacting with polyalkylenetherephthalate.
EFFECT: new method for polyalkylenetherephthalate preparation is suggested.
11 cl, 6 dwg, 10 tbl, 30 ex
