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:
Nov. 10, 2008
Filed:
Sep. 15, 2004
Takeshi Ohmatsuzawa, Tokyo, JP;
Fujito Ehara, Yamaguchi, JP;
Hideshi Hori, Yamaguchi, JP;
Kazuo Toyota, Yamaguchi, JP;
Kenzaburou Fukutani, Yamaguchi, JP;
Junichi Imuta, Tokyo, JP;
Akiyoshi Shimizu, Yamaguchi, JP;
Takayuki Onogi, Sodegaura, JP;
Seiji Noda, Shimonoseki, JP;
Masayuki Sakai, Tokyo, JP;
Shoji Hiraoka, Yamaguchi, JP;
Koji Nakamachi, Tokyo, JP;
Michio Tsugawa, Sodegaura, JP;
Satoru Miyazoe, Sodegaura, JP;
Takeshi Ohmatsuzawa, Tokyo, JP;
Fujito Ehara, Yamaguchi, JP;
Hideshi Hori, Yamaguchi, JP;
Kazuo Toyota, Yamaguchi, JP;
Kenzaburou Fukutani, Yamaguchi, JP;
Junichi Imuta, Tokyo, JP;
Akiyoshi Shimizu, Yamaguchi, JP;
Takayuki Onogi, Sodegaura, JP;
Seiji Noda, Shimonoseki, JP;
Masayuki Sakai, Tokyo, JP;
Shoji Hiraoka, Yamaguchi, JP;
Koji Nakamachi, Tokyo, JP;
Michio Tsugawa, Sodegaura, JP;
Satoru Miyazoe, Sodegaura, JP;
Mitsui Chemicals, Inc., Tokyo, JP;
Abstract
The present invention provides a catalyst for polyester production capable of producing a polyester with high catalytic activity, a process for producing a polyester using the catalyst and a polyester produced thereby. The catalyst comprises a solid titanium compound obtained by dehydro-drying a hydrolyzate obtained by hydrolysis of a titanium halide and which has a molar ratio (OH/Ti) of a hydroxyl group (OH) to titanium (Ti) exceeding 0.09 and less than 4. In the process, the polyester is obtained by polycondensing an aromatic dicarboxylic acid, or an ester-forming derivative thereof, and an aliphatic diol, or ester-forming derivative thereof, in the presence of the catalyst. The resulting polyester has excellent transparency and tint, a titanium content of 1 to 100 ppm, a magnesium content of 1 to 200 ppm and a magnesium to titanium weight ratio of not less than 0.01.