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. 11, 2014
Filed:
Apr. 23, 2012
Applicants:
Edward Budi Muliawan, Kingston, CA;
Raja Hari Poladi, Bear, DE (US);
Hari Babu Sunkara, Hockessin, DE (US);
Inventors:
Edward Budi Muliawan, Kingston, CA;
Raja Hari Poladi, Bear, DE (US);
Hari Babu Sunkara, Hockessin, DE (US);
Assignee:
E I du Pont de Nemours and Company, Wilmington, DE (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 41/42 (2006.01); C07C 43/317 (2006.01); C07C 41/09 (2006.01); C07C 29/80 (2006.01); C07C 41/36 (2006.01);
U.S. Cl.
CPC ...
C07C 41/09 (2013.01); C07C 29/80 (2013.01); C07C 41/36 (2013.01);
Abstract
Provided are processes for preparing low molecular weight polytrimethylene ether glycol by acid catalyzed polycondensation, neutralization, removal of unreacted monomer, and contact with filter aid. The processes can avoid hydrolysis and yet provide product substantially free of catalyst derived end groups.