Toyo Boseki Kabushiki Kaisha

Munekazu Okuhara

Naoki Watanabe

Shoichi Gyobu

Takahiro Nakajima

Yoshitomo Ikehata

Fumikazu Yoshida

Maki Sato

Mitsuyoshi Kuwata

Masaou Matsuda

Yoshinao Matsui

Hiroki Fukuda

Kenichi Tsukamoto

Nobuo Moriyama

Katsuhiko Kageyama

Haruo Matsumoto

A polymerization catalyst for polyester production which contains neither a germanium compound nor an antimony compound as a major component. It contains aluminum as the main metallic ingredient, has excellent catalytic activity, and gives a polyester which is effectively inhibited from suffering thermal degradation, during melt molding, without deactivating or removing the catalyst, and is excellent in thermal stability, stability to thermal oxidation, and hydrolytic resistance. The polymerization catalyst contains as a first metallic ingredient at least one member selected among aluminum and compounds thereof and further contains a phosphorus compound represented by a specific chemical formula. The polyester produced with this catalyst is usable as fibers, films, sheets, various moldings including hollow moldings, etc.

Polymerization catalyst for polyester, polyester produced with the same, and process for producing polyester

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Iwakuni, Japan

Munekazu Okuhara