Toyo Seikan Kaisha, Ltd.

Yorihisa Hamada

Atsushi Kikuchi

Yoshitsugu Maruhashi

Makoto Etoh

Kazunobu Watanabe

A multi-layered perform for substantially preventing the generation of strains and obtaining improved stress cracking resistance with excellent appearance characteristics includes a mouth portion, a body portion and a bottom portion and has at least the body portion and the bottom portion formed of an inner layer, an intermediate layer, and an outer layer by a compression molding. A multi-layered bottle is manufactured by performing a biaxial stretch blow molding of such multi-layered perform. The multi-layered bottle includes a mouth portion a shoulder portion, a body portion and a bottom portion. At least the shoulder portion, the body portion and the bottom portion include an inner layer, an intermediate layer and an outer layer.

Multi-layered preform and multi-layered bottle manufactured by using the same

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.

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Kanagawa, Japan

Yorihisa Hamada