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:
Sep. 28, 1993
Filed:
Sep. 22, 1992
Applicant:
Inventors:
Harry R Hinney, Cross Lanes, WV (US);
Don S Wardius, Charleston, WV (US);
Assignee:
Arco Chemical Technology, L.P., Wilmington, DE (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
568621 ; 560181 ; 560191 ;
Abstract
A process for purifying polyether polyols prepared using double metal cyanide (DMC) catalysts is disclosed. The process involves combining a mixture of the polyol and a C.sub.1 -C.sub.6 aliphatic alcohol with an amount of a chelating agent effective to form an insoluble complex with the catalyst, then filtering the polyol mixture to remove the insoluble complex. The process, which requires that the polyol and alcohol be present in a relative weight ratio of from 1:1 to 100:1, is effective for removing DMC residues and any cations introduced with the chelating agent.