The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 10, 2000
Filed:
Aug. 27, 1999
Hirotoshi Sonoda, Ohtsu, JP;
Atsushi Hara, Ohtsu, JP;
Mitsuhiro Harada, Ohtsu, JP;
Yoshio Araki, Iwakuni, JP;
Shouji Kikuchi, Iwakuni, JP;
Takashi Hashimoto, Tsuruga, JP;
Keisuke Suzuki, Tsuruga, JP;
Hitoshi Furusaki, Tsuruga, JP;
Kazuki Yamauchi, Iwakuni, JP;
Yoshinao Matsui, Ohtsu, JP;
Osamu Kimura, Ohtsu, JP;
Yoshitaka Eto, Shiga-gun, JP;
Toyo Boseki Kabushiki Kaisha, Osaka, JP;
Abstract
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.