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:
Dec. 03, 2013
Filed:
Sep. 29, 2010
Applicants:
Aaron Minter, Wilmington, DE (US);
Edward R. Murphy, Wilmington, DE (US);
Howard C. NG, Kingston, CA;
Rupert Spence, Kingston, CA;
Tuyu Xie, Kingston, CA;
Inventors:
Aaron Minter, Wilmington, DE (US);
Edward R. Murphy, Wilmington, DE (US);
Howard C. Ng, Kingston, CA;
Rupert Spence, Kingston, CA;
Tuyu Xie, Kingston, CA;
Assignee:
E I du Pont de Nemours and Company, Wilmington, DE (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 41/09 (2006.01); C07C 43/13 (2006.01);
U.S. Cl.
CPC ...
C07C 41/09 (2013.01); C07C 43/135 (2013.01);
Abstract
Processes for reducing the color of polytrimethylene ether glycol or copolymers thereof are provided. The processes include polycondensing diols in the presence of an acid catalyst and adding base continuously over a period of the polycondensation reaction. The invention also relates to the polytrimethylene ether glycol thereof produced by these processes.