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:
Jun. 28, 2016
Filed:
Aug. 20, 2013
Applicant:
Bayer Materialscience Ag, Leverkusen, DE;
Inventors:
Reinhard Halpaap, Odenthal, DE;
Mario Schneider, Odenthal, DE;
Oswald Wilmes, Köln, DE;
Uwe Werner, Köln, DE;
Assignee:
Covestro Deutschland AG, Leverkusen, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D 251/34 (2006.01); C08G 18/75 (2006.01); C08G 18/02 (2006.01); C08G 18/09 (2006.01); C08G 18/18 (2006.01);
U.S. Cl.
CPC ...
C07D 251/34 (2013.01); C08G 18/022 (2013.01); C08G 18/092 (2013.01); C08G 18/1875 (2013.01); C08G 18/755 (2013.01);
Abstract
The invention relates to a process for preparing polyisocyanates containing isocyanurate groups by trimerising cycloaliphatic diisocyanates using a catalyst solution comprising at least one quaternary ammonium hydroxide, characterized in that the catalyst solution is metered in such that the reaction temperature is >90° C. and ≦140° C.