Stretched molded products from PET/PBT blends and process for their production

摘要

The present invention relates to a stretch molded structure obtained by stretch molding a polyester composition containing a thermoplastic polyester (A) comprising an ethylene terephthalate unit as a main component and a thermoplastic polyester (B) comprising a butylene terephthalate unit as a main component in an A : B weight ratio of from 99.9 : 0.1 to 91 : 9. This stretch molded structure has a decreased stress at the time of stretch molding, and excellent shape appearance. At the same time, it has reduced residual stress, and excellent heat resistance. In addition, it has excellent transparency, mechanical strength and dimensional stability.;Furthermore, when this stretch molded structure is used in a heat-resistant container in which at least the body portion is heat-set and the mouth portion or the mouth portion and the center of the bottom portion are heat-crystallized, high producibility can be obtained and the heat-resistance can be markedly increased.