Toyo Seikan Kaisha, Ltd.

Satoshi Shibata

Norihisa Hirota

A biaxially oriented polyester container with a uniformly and sufficiently elongated and thin-walled bottom part having excellent drop strength, improved ESC resistance and reduced weight, and a method of manufacturing the container. The biaxially oriented polyester container of the present invention is characterized in that, when an X-ray diffraction measurement is performed in and near a bottom center area of the biaxially oriented polyester container formed by a double-stage orientation blow molding method, a peak indicative of molecular orientation is observed near a diffraction angle of 2&#x3b8;=15 to 30&#xb0; and an orientation parameter (BO) expressed by the following formula (1) is in the range of 0.5&#x2266;BO&#x2266;2 in and near the bottom center area:orientation parameter ()=&#x2003;&#x2003;(1)(where Ix indicates a diffraction intensity near the diffraction angle of 2&#x3b8;=15 to 30&#xb0; when the X-ray diffraction measurement is performed in the X-direction, and Iy indicates a diffraction intensity near the diffraction angle of 2&#x3b8;=15 to 30&#xb0; when the X-ray diffraction measurement is performed in a direction orthogonal to that for Ix).

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Kanagawa, Japan

Satoshi Shibata