METHOD FOR PREPARATION OF POLYALKYLENE THEREPHTHALATES, METHOD TO MANUFACTURE MOULDED POLYALKYLENE THEREPHTHALATE PART AND MOULDED POLYALKYLENETHEREPHTHALATE PART

摘要

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