Toyo Boseki Kabushiki Kaisha

Yoshinao Matsui

Shoichi Gyobu

Takahiro Nakajima

Masaou Matsuda

Mitsuyoshi Kuwata

Nobuo Moriyama

Katsuya Ito

Naoki Watanabe

Yoshitomo Ikehata

Yoshio Araki

Fumikazu Yoshida

Maki Sato

Ken-ichi Tsukamoto

Haruo Matsumoto

Hirotoshi Sonoda

Katsuhiko Kageyama

Keisuke Suzuki

Yoshitaka Eto

Hiroki Fukuda

Mitsuhiro Harada

Kenichi Tsukamoto

Munekazu Okuhara

Atsushi Hara

Shouji Kikuchi

Hitoshi Furusaki

Takashi Hashimoto

Osamu Kimura

Kazuki Yamauchi

Seisyu Hayashi

This invention provides a novel polymerization catalyst other than antimony compounds, polyester produced by using the same and a process for producing polyester. The polycondensation catalyst of this invention is a polyester polymerization catalyst comprising an aluminum compound and a phosphorus compound having a specific structure. Further, this invention relates to polyester produced by using this polyester polymerization catalyst and a process for producing polyester. Further, this invention relates to fibers, films and hollow molded articles comprising the polyester.

Polyester polymerization catalyst, polyester produced by using the same, and process for producing polyester

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

A polyester resin comprising a polyester resin chip (A) and a polyester resin fine particle (B) which has the same composition as the (A) and which passes through a 10.5 mesh screen in a proportion of 0.1-300 ppm, wherein a cyclic trimer increases in a proportion of not more than 0.30 wt % upon melting at a temperature of 290.degree. C. for 60 minutes; a polyester resin characterized in that a cyclic trimer increases in a proportion of not more than 0.30 wt % upon melting at a temperature of 290.degree. C. for 60 minutes, and the contents of Na, Ca, Mg and/or Si in the polyeser resin is 0.001-5 ppm and the total of these contents is not more than 10 ppm; and production methods thereof. According to the polyester resin of the present invention, mold such as stretch blow mold, heat setting mold, vacuum forming mold and the like are less stained in sheet forming, bottle forming and the like, so that forming can be continued for a long time to easily produce a multitude of formed articles with superior transparency. As a result, hollow articles having superior transparency and heat resistance of the finish part can be obtained.

Polyester resin and production method thereof

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Ohtsu, Japan

Yoshinao Matsui