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:
Jan. 01, 2019
Filed:
Aug. 15, 2016
Covestro Deutschland Ag, Leverkusen, DE;
Frank Richter, Leverkusen, DE;
COVESTRO DEUTSCHLAND AG, Leverkusen, DE;
Abstract
The invention relates to a process for modifying isocyanates where at least one organic isocyanate with NCO functionality >1 is oligomerized in the presence of at least one catalyst, characterized in that the catalyst comprises, as isocyanatemodification catalysts, at least one cyclic ammonium salt having a cation of the formula (I) (formula I), where the N-containing substituents Rand Rare mutually independently identical or different aliphatic, cycloaliphatic, aromatic or araliphatic C, to Cmoieties which are saturated or unsaturated, linear or branched, optionally substituted and/or interrupted by heteroatoms from the group of oxygen, sulphur and nitrogen, and Y is a substituted or unsubstituted, linear or branched Cto Csegment optionally interrupted by heteroatoms from the group of oxygen, sulphur and nitrogen or else intempted by aromatic rings, and optionally containing other rings. The invention further relates to the use of such a catalyst.