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:
May. 12, 2015
Filed:
Jun. 30, 2010
Hartmut Nefzger, Pulheim, DE;
Erika Bauer, Jüchen, DE;
Jörg Hofmann, Krefeld, DE;
Klaus Lorenz, Dormagen, DE;
Norbert Hahn, Frechen, DE;
Hartmut Nefzger, Pulheim, DE;
Erika Bauer, Jüchen, DE;
Jörg Hofmann, Krefeld, DE;
Klaus Lorenz, Dormagen, DE;
Norbert Hahn, Frechen, DE;
Bayer MaterialScience AG, Leverkusen, DE;
Abstract
The present invention relates to a process for producing polyether polyols having primary hydroxyl end groups, comprising the steps of reacting a starter compound containing active hydrogen atoms with an epoxide under double metal cyanide catalysis, reacting the resulting product with a cyclic carboxylic anhydride and reacting this resulting product with ethylene oxide in the presence of a catalyst containing at least one nitrogen atom per molecule, excluding non-cyclic, identically substituted tertiary amines. The invention further relates to polyether polyols obtainable by this process, compositions containing said polyols and polyurethane polymers based on said polyols.