POLYESTER RESIN COMPOSITION, SHEET-FORM MATTER, BLOW- MOLDED PRODUCT AND ORIENTED FILM MADE FROM THE COMPOSITION

摘要

PROBLEM TO BE SOLVED: To provide a polyester resin composition which shows an excellent long-term continuous moldability and yields a molded part, especially a blow- molded product such as a vessel, etc., having an excellent transparency and thermal dimensional stability. SOLUTION: This composition is obtained by blending 0.1 ppb to 1,000 ppm polyacetal (D) to a polyester resin composition (C) comprising a polyester chip (A) wherein the main repeating unit is ethylene terephthalate and 0.1 to 500 ppm polyester fines (B) having a composition identical to that of the polyester chip (A), wherein the amount of cyclic trimers increased when melted at 290 deg.C for 60 mm is 0.30 wt.% or smaller.