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:
Feb. 19, 2008
Filed:
Dec. 21, 2005
Wei Chen, Beijing, CN;
Guixiang Zhu, Beijing, CN;
Xirong Chen, Beijing, CN;
Jinglan LU, Beijing, CN;
Yanxia Zhang, Beijing, CN;
Yifan Yan, Beijing, CN;
Wei Zhang, Beijing, CN;
Wei Chen, Beijing, CN;
Guixiang Zhu, Beijing, CN;
Xirong Chen, Beijing, CN;
Jinglan Lu, Beijing, CN;
Yanxia Zhang, Beijing, CN;
Yifan Yan, Beijing, CN;
Wei Zhang, Beijing, CN;
China Petroleum & Chemical Corporation, Beijing, CN;
Beijing Research Institute of Chemical Industry, Beijing, CN;
Abstract
The present invention relates to a biodegradable copolyester of high molecular weight and narrow molecular weight distribution. The copolyester has a Mof 100,000-600,000 g/mol, and a molecular weight distribution of 1.2-3. The process for synthesizing the polyester comprises the steps of: 1) adding the following monomers and an optional catalyst component Cat1 to carry out interesterification and/or esterification: (a) aromatic dicarboxylic acid, ester thereof, anhydride thereof, or mixture thereof, (b) aliphatic diol, alicyclic diol or mixture thereof, and (c) aliphatic dicarboxylic acid, alicyclic dicarboxylic acid, ester thereof, anhydrides thereof, or a mixture thereof; 2) prepolymerizing the reaction system under vacuum; and adding a catalyst component Cat2 to the prepolymerized product; wherein the catalyst component Cat1 is selected from the group consisting of the compounds of Ti, Sb and Zn, and mixtures thereof; and the catalyst component Cat2 is selected from the compounds of RE and mixtures thereof.