PROCESS FOR PRODUCING POLYALKYLENE TEREPHTHALATE, PROCESS FOR PRODUCING POLYALKYLENE TEREPHTHALATE MOLDING AND POLYALKYLENE TEREPHTHALATE MOLDING

摘要

A process for producing a polyalkylene terephthalate, comprising feeding a polyalkylene terephthalate prepolymer of 0.2 to 2 dl/g intrinsic viscosity [eta] whose 70 mol% or more is constituted of ethylene terephthalate or 1,4-butylene terephthalate repeating units in molten form through a raw material supply port into a polymerizer; delivering the polyalkylene terephthalate prepolymer through holes of a perforated plate; and thereafter effecting polymerization of the prepolymer in vacuum while causing the prepolymer to fall along the outside open surface of a support at a temperature of (prepolymer crystal melting point - 10°C) to (prepolymer crystal melting point + 30°C) under the condition of the formula S1/S2 > 1 wherein S1 is the surface area of falling polyalkylene terephthalate while S2 is the area in which the polyalkylene terephthalate is in contact with the support.