Methods of production of polyalkylene terephthalate, production of an article molded article molded of polyalkylene terephthalate and polyalkylene terephthalate, polyethylene terephthalate, and article molded of polyethylene terephthalate (PET)

摘要

The present invention provides a method of producing polyalkylene terephthalate, which comprises: introducing a prepolymer of polyalkylene terephthalate that is in a molten state comprising 70 mol% or more of ethylene terephthalate or 1,4-butylene terephthalate repeating units and having an intrinsic viscosity [] between 0.2 and 2 dl/g through a feed opening to a polymerization reactor; discharging the introduced prepolymer from holes of a perforated plate; and polymerizing the prepolymer under reduced pressure, while allowing the prepolymer to fall along the surface of a support that is open towards the outside at a temperature between the [crystalline melting point - 10 DEG C] of the prepolymer or higher and the [crystalline melting point + 30 DEG C] of the prepolymer or lower under the conditions represented by a formula S 1 /S 2 1, wherein S1 is the surface area of falling polyalkylene terephthalate, and S2 is the area where the support is in contact with polyalkylene terephthalate.