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:
May. 08, 2012
Filed:
May. 19, 2009
Tatsuya Nagano, Nagoya, JP;
Tomoko Nasuno, Nagoya, JP;
Hiroyuki Ome, Nagoya, JP;
Yong He, Shanghai, CN;
BO Yu, Shanghai, CN;
Kexin Zhu, Shanghai, CN;
Xiao Guo, Shanghai, CN;
Pujing Zuo, Shanghai, CN;
Tatsuya Nagano, Nagoya, JP;
Tomoko Nasuno, Nagoya, JP;
Hiroyuki Ome, Nagoya, JP;
Yong He, Shanghai, CN;
Bo Yu, Shanghai, CN;
Kexin Zhu, Shanghai, CN;
Xiao Guo, Shanghai, CN;
Pujing Zuo, Shanghai, CN;
Toray Industries, Inc., , JP;
Abstract
A method for producing an aliphatic polyester resin including a melt polymerization step and a subsequent solid phase polymerization step, using a sulfonic acid group-containing compound as a catalyst, wherein the addition amount of the sulfonic acid group-containing compound during melt polymerization is 300 to 3000 ppm with respect to a raw material monomer calculated as sulfur atoms, the content of the sulfonic acid group-containing compound during melt polymerization is 300 to 3000 ppm with respect to a produced polymer calculated as sulfer atoms, and a residual rate of the sulfonic acid group-containing compound after solid phase at polymerization is more than 50.