Patent ID: 8133955

Claim:
An aromatic polyester composition, comprising: a melt-kneaded product of 99-70 weight parts of an aromatic polyester resin and 1-30 wt, parts (providing a total of 100 wt, parts together with the aromatic polyester resin) of a polyglycolic acid resin having a weight-average molecular weight of at most 20,000, wherein the composition is characterized by a transesterification rate C TE (%) of 20-60% determined by formula (1) below based on a peak integration ratio of methylene group in polyglycolic acid appearing at σ4.87 ppm with reference to tetramethylsilane according to 1 H-NMR measurement: C TE (%)=[1− I ( B )/ I ( A )]×100 (1), wherein I (A): a peak integration ratio of methylene group of the polyglycolic acid main chain with respect to alkylene group of the aromatic polyester main chain calculated from the components weight ratio; and I (B): a peak integration ratio of methylene group of polyglycolic acid main chain to alkylene group of the aromatic polyester main chain in the resin composition.