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:
Mar. 30, 2021
Filed:
May. 11, 2017
Applicant:
Covestro Deutschland Ag, Leverkusen, DE;
Inventors:
Klaus Lorenz, Dormagen, DE;
Ingo Danek, Cologne, DE;
Assignee:
Covestro Deutschland AG, Leverkusen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G 65/26 (2006.01); C08G 18/32 (2006.01); C08G 18/48 (2006.01); C08L 75/08 (2006.01);
U.S. Cl.
CPC ...
C08G 65/2663 (2013.01); C08G 18/3206 (2013.01); C08G 18/4829 (2013.01); C08G 18/4866 (2013.01); C08G 65/2609 (2013.01); C08G 65/2648 (2013.01); C08L 75/08 (2013.01);
Abstract
The invention relates to a two-stage method for the preparation of polyoxyalkylene polyols having low equivalent molar masses, in which the method requires no reprocessing. The invention is characterized in that, in the first stage, a polyoxyalkylene polyol precursor is provided, which contains the salts of a strong Bronsted acid, and in that, in a second stage, the polyoxyalkylene polyol precursor is further reacted with alkylene oxides under DMC catalysis.