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:
Jan. 19, 1993
Filed:
Mar. 10, 1992
Applicant:
Inventor:
Suriyanarayan Dorai, Lockport, NY (US);
Assignee:
E. I. Du Pont de Nemours and Company, Wilmington, DE (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
L07L / ;
U.S. Cl.
CPC ...
568617 ; 560227 ;
Abstract
A process for reducing the molecular weight of polytetramethylene ether glycol without significant conversion of polytetramethylene ether glycol to tetrahydrofuran monomer is disclosed. The process involves a two-step procedure. The first step comprises reacting polytetramethylene ether glycol with a perfluoroalkyl carboxylic acid to form a perfluoroalkyl ester of polytetramethylene ether glycol. That ester is, in the second step, converted back to polytetramethylene ether glycol of reduced molecular weight by hydrolysis or alcoholysis.