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. 23, 2012
Filed:
Feb. 22, 2007
Takahiro Nakajima, Ohtsu, JP;
Ken-ichi Tsukamoto, Ohtsu, JP;
Shoichi Gyobu, Ohtsu, JP;
Mitsuyoshi Kuwata, Ohtsu, JP;
Takahiro Nakajima, Ohtsu, JP;
Ken-ichi Tsukamoto, Ohtsu, JP;
Shoichi Gyobu, Ohtsu, JP;
Mitsuyoshi Kuwata, Ohtsu, JP;
Toyo Boseki Kabushiki Kaisha, Osaka, JP;
Abstract
The present invention provides processes for producing polyester. In one of the embodiments, the invention provides a process for producing polyester, comprising adding a catalyst in a polycondensation reaction, esterification reaction or transesterification reaction between components comprising at least a polyfunctional alcohol and at least a polyfunctional carboxylic acid or ester-forming derivative of a polyfunctional carboxylic acid to produce the polyester; and obtaining the polyester, wherein the polymerization catalyst comprises an aluminum substance and a phosphorus compound, wherein the aluminum substance is selected from the group consisting of aluminum hydroxide and aluminum alkoxides, and wherein the phosphorus compound has an aromatic ring structure.