Toyo Boseki Kabushiki Kaisha

Hiroki Fukuda

Naoki Watanabe

Shoichi Gyobu

Takahiro Nakajima

Yoshitomo Ikehata

Fumikazu Yoshida

Maki Sato

Hideki Shimizu

Mitsuyoshi Kuwata

Masaou Matsuda

Yoshinao Matsui

Haruo Matsumoto

Keisuke Suzuki

Tsuyoshi Matsunaga

Kenichi Tsukamoto

Nobuo Moriyama

Katsuhiko Kageyama

Munekazu Okuhara

An amorphous polyester chip having superior processing ability is characterized by a moisture content of not more than 300 ppm and a fine particle content of not more than 500 ppm. A preferred embodiment is a copolymerized polyester chip comprising a main repeating unit consisting of ethylene terephthalate, and 1,4-dimethylene-cyclohexane terephthalate or neopentyl terephthalate, wherein the glycol component of the copolymerized polyester has a specific composition of 50 to 85 mol % of ethylene glycol, 12 to 45 mol % of 1,4-cyclohexanedimethanol or neopentyl glycol and 1.5 to 7.0 mol % of diethylene glycol. Such amorphous polyester chip can be obtained by cooling an amorphous polyester obtained by melt polymerization, cutting the polyester to give a chip, feeding the chip in a treatment tank, drying the chip and removing fine particles.

Amorphous polyester chip and method for production thereof, and method for storage of amorphous polyester chip

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

Hiroki Fukuda