Toyo Boseki Kabushiki Kaisha

Yoshitaka Eto

Mitsuhiro Harada

Hirotoshi Sonoda

Yoshio Araki

Hironobu Kitagawa

Yoshinao Matsui

Keisuke Suzuki

Shouji Kikuchi

Hitoshi Furusaki

Takashi Hashimoto

Osamu Kimura

Kazuki Yamauchi

Atsushi Hara

The present invention provides a polyester resin composition comprising (A) 10 to 90% by weight of a polyethylene terephthalate polymer having 100 to 75 mole % of ethylene terephthalate units and (B) 90 to 10% by weight of a polyester resin wherein the polyester resin composition when molded into a sheet has an oxygen permeability coefficient of 3.0 or less cc-mm/m,day&middot;atm. The polyester resin composition of the present invention gives a molded product which is outstanding in transparency, gas barrier property, ultraviolet-screening property and impact strength and therefore suitable as a reduced pressure blood-collecting tube.

Polyester resin composition and reduced pressure blood-collecting tube

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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Otsu, Japan

Yoshitaka Eto