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:
Dec. 26, 2017
Filed:
Feb. 13, 2015
Applicant:
Covestro Deutschland Ag, Leverkusen, DE;
Inventor:
Frank Richter, Leverkusen, DE;
Assignee:
Covestro Deutschland AG, Leverkusen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G 18/02 (2006.01); C08G 18/20 (2006.01);
U.S. Cl.
CPC ...
C08G 18/022 (2013.01); C08G 18/02 (2013.01); C08G 18/027 (2013.01); C08G 18/2081 (2013.01); C08G 2105/02 (2013.01);
Abstract
The Invention relates to a process for modifying isocyanates, in which at least one monomeric organic isocyanate having an NCO functionality>1 is oligomerized in the presence of at least one spirocyclic ammonium salt having a cation of the formula I as catalysts for the isocyanate modification, where substituents X and Y in the N positions are identical or different, substituted or unsubstituted C2-C20-alkylene chains optionally interrupted by heteroatoms (O, N, S) and by aromatic rings. The invention further relates to the use of such a catalyst.