POLYESTER RESIN AND PLASTIC BOTTLE WITH RESISTANCE TO HEAT AND PRESSURE

摘要

A polyester resin which is suitable for use as a plastic bottle having resistance to heat and pressure and which is inexpensive and does not impair productivity. The polyester resin is intended to improve the heat resistance of PET bottles from a material standpoint. Also provided is a heat- and pressure-resistant plastic bottle which is inexpensive and is excellent in high-temperature pressure resistance and impact resistance. The polyester resin consists mainly of ethylene terephthalate units and contains minor comonomer units derived from at least one member selected among isophthalic acid, cyclohexanedimethanol, and diethylene glycol, the content of the minor comonomer units of these three kinds being less than 3 mol%.