| abstract |
An object of the present invention is to provide a polyester mixture having a quality excellent in gas barrier properties, transparency and heat resistance and which can be produced by a simple process, and a method for producing the same. (A): A polycondensation reaction of an esterified product of terephthalic acid and ethylene glycol in a molten state, and a polyethylene terephthalate in a molten state discharged from a polymerization vessel that performs the polycondensation reaction in a molten state; (B): a resin mixture obtained by introducing a polyester in a molten state different from that of (A) into a mixer, followed by stirring and mixing. Since there is no need to re-melt the entire amount of chips, a large-sized extruder is not required, and the energy requirement can be reduced. |