Patent ID: 7666486

Claim:
A multi-layer biaxially stretched blow molded bottle having a 3-layer structure of polyethylene terephthalate/nylon MXD6/polyethylene terephthalate or a 5-layer structure of polyethylene terephthalate/nylon MXD6/polyethylene terephthalate/nylon MXD6/polyethylene terephthalate, wherein the multi-layer biaxially stretched blow molded bottle is obtained by subjecting a multi-layer preform to biaxial stretch blow molding at a stretching temperature of 86-94° C., a draw ratio in a machine direction of 2.15-3.30 times by means of a stretching rod, and a draw ratio in a transverse direction of 4.70-5.50 times by blowing high-pressure air within a blow mold, and wherein the oxygen gas transmission coefficient of the nylon MXD6 layer is at most 6.0×10 −14 cm 3 ·cm/cm 2 ·sec·cmHg as measured under conditions of a temperature of 23° C. and a relative humidity of 80%.