POLYESTER RESIN COMPOSITION AND BOTTLE PRODUCED FROM THE RESIN COMPOSITION

摘要

A resin composition comprising polyethylene terephthalate and polyethylene naphthalate, a process for producing the composition, a bottle produced from the composition, and a process for producing the bottle. The resin composition is prepared by melt-mixing (A) polyethylene terephthalate with (B) polyethylene naphthalate in such a ratio that the proportion of ethylene naphthalate units is 5 to 15 mol % based on the sum of (A) and (B) with an extrusion kneader while regulating the ratio of the extruder output to the rotational speed of the screw to 0.1 to 1.4 kg/hr.rpm. The composition has a degree of transesterification of 20 % or lower and, despite this, can give bottles with high transparency and high resistance to hot pressing in high-speed production facilities.